Find checked plumbers in Merton for bathroom installation, refurbishment and repairs — suites, showers, baths, taps, wet rooms, and electric showers.

✅ Checked before listing — identity, insurance, trading presence, Gas Safe (where relevant).
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Contact one or more plumbers directly from the listings above. Listings are checked before publication. Workmanship guarantee availability is shown on each listing where offered.

When you contact a plumber, confirm:

• Service scope and timeline.
• Diagnostic, design, and installation pricing.
• Whether other trades are included or quoted separately (electrician, tiler, plasterer, decorator).
• Call-out and snagging terms.

You contact and pay the plumber directly — each listing operates independently. You can contact more than one plumber, and there is no commitment until you agree a booking.

Visible water escape, ceiling leak from a bathroom above, burst pipe? Don’t wait for an installation conversation — see Burst Pipes Merton for immediate isolation guidance.

Hidden leak under a bathroom floor with no visible escape? Leak Detection Merton is the right starting point.

Smell gas, hear hissing or suspect a gas leak? Call the National Gas Emergency Service on 0800 111 999 immediately (free, 24/7).¹

Renting from a housing association? Bathroom installations and significant repairs are normally arranged by your housing association — check your tenancy paperwork. See routing below.

Right page for your problem

• New bathroom installation, refurbishment, walk-in shower, wet room, bath or basin replacement, taps, electric shower, extractor fan, mixer shower, towel rail — you’re on the right page.
• Tap dripping, single tap repair, cartridge replacement only — Tap Repair / Installation Merton
• Toilet pan replacement, blocked toilet, flush mechanism, toilet seat — Toilet Repairs Merton
• Boiler-side hot water issue (no hot water from combi, pressure loss, system or cylinder issue) — Boiler Repair Merton or Central Heating Repair Merton
• Hidden leak under bathroom floor or in screed — Leak Detection Merton
• Out-of-hours emergency — Emergency Plumber Merton

What bathroom plumbing covers

Bathroom plumbing spans the water and sanitation infrastructure, the fittings the user interacts with, and the regulatory framework around electrical work in wet areas.

Water supply. Cold and hot water feeds to taps, showers, baths, basins, bidets, and the toilet cistern. Building Regulations requirements for cold water supply (G1) and hot water supply and systems (G3) are set out in Approved Document G.⁵⁶

Hot water provision. Hot water can come from a combi boiler (instant), a system or regular boiler with a hot water cylinder, an electric instant heater (point-of-use), or an electric storage cylinder. Electric showers are independent — they take a cold mains feed and heat water at the unit. Unvented hot water cylinders are pressurised systems; installation must be carried out by a competent person, and notified to building control unless self-certified via a competent person scheme.⁵⁶

Sanitation. Soil and waste pipework from toilets, baths, basins, showers, bidets and washing machines connects to the property’s drainage system. Building Regulations requirements for sanitation (G4) and bathrooms (G5) are set out in Approved Document G.⁵⁶

Ventilation. Bathrooms must have adequate ventilation; this is typically achieved with mechanical extract ventilation in line with Approved Document F. Approved Document F sets out intermittent or continuous extract rates; openable windows may provide purge ventilation rather than extract ventilation.⁵⁷

Electrical work. Lighting, extractor fans, electric showers, heated towel rails (if hardwired), shaver sockets, underfloor heating controls and bathroom heaters all involve electrical work. Bathroom electrics are subject to special locations rules — fittings within designated zones (0, 1, 2 in BS 7671) require specific IP ratings. BS 7671 is the recognised standard for compliance with Part P but is not legislation itself. New circuits, consumer unit replacement, and additions or alterations to existing circuits in bathroom zones are notifiable under Building Regulations Part P. Like-for-like replacement of accessories outside zones is normally non-notifiable, though all work must comply with BS 7671. See the Bathroom electrical zones section below.

Tiling, sealing and waterproofing. Tiling, grouting, silicone sealing, and (in wet rooms) tanking and waterproof membranes. Some plumbers carry out tiling themselves; others coordinate with a tiler.

A new bathroom installation typically engages all of these elements. A bathroom repair usually engages one or two.

Bathroom electrical zones

Bathrooms are classified as a “special location” under BS 7671 (the Wiring Regulations) because of the higher risk of electric shock from water contact. The bathroom is divided into zones, and electrical fittings in each zone must meet a minimum IP (Ingress Protection) rating. BS 7671 generally requires 30 mA RCD protection for bathroom circuits.

• Zone 0 — inside the bath or shower tray. Fittings must be SELV (separated extra-low voltage) and IPX7 minimum. Most fittings are not allowed in zone 0.
• Zone 1 — directly above the bath or shower, to a height of 2.25 m. Fittings must be IPX4 minimum (and SELV unless protected by a suitable RCD). Common fittings here: ceiling lights designed for zone 1, electric showers (subject to manufacturer instructions).
• Zone 2 — extending 0.6 m horizontally from zone 1. Fittings must be IPX4 minimum. Lighting, shaver sockets that meet specific safety standards, and some heating fittings can sit here.
• Outside the zones — standard wiring rules apply, but the bathroom remains a special location and additional protections apply.

Notifiable electrical work in a bathroom — new circuits, consumer unit changes, and some additions or alterations within zones — must be certified through an Approved Document P route — typically a competent person scheme registration (NICEIC or NAPIT, among others), a third-party certifier, or building control.³⁷ Like-for-like replacement of accessories outside zones is normally non-notifiable, though it must still comply with BS 7671.

A plumber installing a bathroom suite normally does not carry out the electrical work themselves unless they hold relevant electrical qualifications. Most directory plumbers working on bathroom installations either coordinate with a Part-P-registered electrician or work alongside one already on site.

Common bathroom plumbing tasks

The points below are for orientation — actual scope on the day depends on the property and what’s already in place. Local property-type observations are added where Merton’s housing stock affects how the task typically presents.

• New bathroom installation. Removing the existing suite, modifying water supply and waste pipework as needed, installing the new suite (bath/shower, basin, toilet, taps, fittings), commissioning, and finishing. Tiling, plastering, decorating and electrical work are normally separate trades or quoted separately. In converted Victorian and Edwardian flats often found in Wimbledon and west Merton, bathroom installations may engage shared stack risers and party-wall pipework, requiring managing-agent permission.
• Bathroom refurbishment. Existing suite replaced like-for-like or with reconfiguration. In Raynes Park 1930s semis, refurbishments often retain the existing airing-cupboard cylinder location because relocation engages structural and electrical re-routing work that’s not always practical.
• Walk-in shower installation. Removing a bath, fitting a shower tray and enclosure, modifying water supply and waste, installing the shower valve and fittings. In modern Colliers Wood and South Wimbledon flats with back-to-back bathroom layouts, waste re-routing may be constrained by the position of the shared stack.
• Wet room installation. Higher-spec — tanking the floor and walls (waterproof membrane), forming a fall to a wet-room drain, tiling, fitting fixtures. See the dedicated Wet rooms and waterproofing section below for Merton-specific structural considerations.
• Bath replacement. Removing the existing bath, modifying waste and supply if needed, fitting the new bath. Cast-iron bath removal in older Wimbledon properties (Victorian/Edwardian stock) often needs two-person handling because of weight, and joist load assessment if a new freestanding cast-iron suite is being installed in an upper-floor bathroom.
• Basin or sink replacement. Removing the existing basin, fitting the new one, connecting taps and waste.
• Tap replacement. Most bathroom tap work is single-task — see Tap Repair / Installation Merton for lighter-touch tap-only work. For taps replaced as part of a bathroom refurbishment, this page is the right starting point. In Merton’s hard-water area, tap cartridge replacement at the same visit as a like-for-like tap upgrade may be worth discussing.
• Mixer shower install. Replacing an existing shower with a thermostatic mixer (TMV) shower. Pressure and flow rate from the existing supply determine which valves are suitable. In St Helier and Pollards Hill estate housing, original gravity-fed systems may not produce sufficient pressure for higher-flow modern mixer valves without supply upgrade.
• Power shower install. Adding a pump to boost flow rate. Power showers need a tank-fed water supply (combi boilers don’t normally support power showers).
• Electric shower install. Independent unit fed from cold mains with its own electrical supply. Electric showers in zone 1 require IPX4 minimum and zone-compliant installation. Notifiable electrical work — must follow Approved Document P.³⁷ In Merton’s hard-water area, electric shower elements may have a shorter service life than in soft-water boroughs; element replacement is sometimes cheaper than a full new unit if the shower is otherwise in good condition.
• Heated towel rail install. Plumbed (connected to the heating circuit), electric (independent), or dual fuel. In converted Wimbledon flats with shared heating circuits, plumbed towel rail installation may engage building-manager coordination.
• Extractor fan install. Mechanical extract ventilation is typically used to meet Approved Document F requirements in bathrooms.⁵⁷ Notifiable electrical work where new wiring is involved.³⁷
• Underfloor heating install. Wet (warm-water) systems connect to the central heating; electric mat systems are independent. Both are seen in bathroom refurbishments in 1930s suburban properties (Raynes Park, Lower Morden) where existing tiled floors are being lifted as part of the refurb.

What a directory plumber will do — and what they won’t

A plumber arriving for a bathroom installation will normally scope the work, provide a quote (often after a detailed survey for full bathroom installs), modify water supply and waste pipework as needed, install the suite and fittings, commission the installation, and provide a written record of the work and any product warranties.

Many will also coordinate other trades — tiler, electrician, plasterer, decorator — either by direct subcontracting or by recommending trades the customer engages separately. This varies by plumber.

Directory-listed plumbers will not normally:

• Carry out notifiable electrical work without appropriate competence — bathroom electrical work involving new circuits, consumer unit changes, and most additions or alterations within zones must be certified through an Approved Document P route.³⁷ Plumbers without Part-P registration coordinate with a registered electrician.
• Install unvented hot water cylinders without appropriate competence — installation must be carried out by a competent person, and notified to building control unless self-certified via a competent person scheme.⁵⁶
• Carry out structural alterations (wall removal, joist alteration for bath weight, ceiling reinforcement for tile loading) without appropriate competence and, where required, building control involvement.
• Work on shared stack risers, lateral drains or communal pipework in mansion blocks, converted houses or estate housing without authorisation from the freeholder, managing agent or housing association.
• Carry out tiling, plastering or decorating to finish standard — most plumbers leave the bathroom in a “watertight, fittings installed” state, with finishing trades separate.
• Provide insurance-grade installation reports unless explicitly agreed in scope. A standard installation produces a job sheet or invoice — not a building-warranty-grade report.

For bathroom installations in conservation areas or listed buildings, planning and listed building consent should be checked before work that affects external fabric (new external soil pipe, new flue or vent terminations on visible elevations) — directory plumbers don’t normally manage planning applications.

Wet rooms and waterproofing

Wet rooms are higher-spec bathroom installations where the entire floor is the shower drainage area, with no enclosure separating the shower from the rest of the bathroom. Wet rooms require tanking — a waterproof membrane applied to the floor and lower walls before tiling.

Tanking failure is a frequent cause of leak callouts in wet rooms. Symptoms include damp patches on the ceiling below, peeling paint or staining on adjacent walls, and persistent damp smells from the bathroom floor structure. Diagnosing a tanking failure normally requires lifting tiles to inspect the membrane, which is destructive — see Leak Detection Merton for non-destructive investigation methods.

A reputable wet-room installation includes:

• A continuous tanking membrane on floor and walls to a minimum height (typically 1.5 m around the shower area, full height in shower-direct walls).
• Correctly formed floor falls toward the wet-room drain.
• Pipe penetrations through the membrane sealed with manufacturer-approved collars.
• Sufficient drying time between membrane application and tiling.

Wet room considerations specific to Merton’s housing stock:

• Wimbledon and west Merton Victorian and Edwardian properties. Original timber joists with lath-and-plaster ceilings below mean wet-room installations often need joist reinforcement to take the loading of tiled floor build-ups. Lath-and-plaster ceilings in the room below the bathroom are vulnerable to even minor tanking failures — water can track along laths and emerge as ceiling damage well away from the leak source. Installations in these properties may specify additional moisture barriers below the wet-room floor as a precaution.
• Raynes Park and west Merton 1930s suburban semis. Concrete floors in extension-built bathrooms simplify wet-room construction; original suspended-timber-floor bathrooms in the main house need the same joist-reinforcement and below-floor moisture barriers as Victorian properties.
• Modern flats in Colliers Wood, South Wimbledon and across the borough. Wet-room installation in flats requires explicit permission from the freeholder or managing agent — most leases require licence for alterations for wet-room construction because of the leak risk to flats below. Some leases prohibit wet rooms outright; check before commissioning.
• HA-managed properties in Pollards Hill, St Helier and similar areas. Wet-room installation in HA-managed properties is not normally commissionable independently — the housing association controls bathroom replacement programmes and standardises specifications.
• Conservation area properties. Internal wet-room installation does not engage conservation-area controls. External fabric changes (new soil pipe routing visible on a front elevation in the John Innes conservation areas) may.⁵³

Hot water provision and bathroom flow

Bathroom hot water performance depends on the property’s hot water system. In Merton specifically, the housing-stock mix means different hot water systems are seen in different areas of the borough.

• Combi boiler. Instant hot water on demand. Flow rate at the bathroom tap or shower is limited by the boiler’s hot water output (kW). For bathrooms with high-flow showers or multiple simultaneous outlets (basin + shower, or two bathrooms running hot at once), the boiler’s output rating matters — a small combi may not support a power shower at acceptable flow. Combi boilers are seen in modern Colliers Wood and South Wimbledon flats and in many post-2000 boiler replacements in Wimbledon and Mitcham.
• System / regular boiler with vented cylinder. Hot water stored in the cylinder, fed by gravity (in older properties) or pumped (in modern installations). Cylinder size determines how much hot water is available before reheat. Power showers normally require a vented (tank-fed) system because they pump from the tank, not from the mains. Vented systems are still seen in older Wimbledon Victorian and Edwardian properties retaining their original heating layouts, and in 1930s Raynes Park and Motspur Park semis where the airing-cupboard cylinder remains original.
• System / regular boiler with unvented cylinder. Cylinder pressurised at mains pressure. Flow rate equivalent to the mains pressure — generally good. Unvented cylinder installation must be carried out by a competent person, and notified to building control unless self-certified via a competent person scheme.⁵⁶ Seen in newer-build flats and in properties where boiler replacements have included system upgrade.
• Electric instant heater (point-of-use). Independent of the central hot water system. Smaller-scale; sometimes seen in en-suites with low usage in Raynes Park and Wimbledon Park extension projects.
• Electric shower. Independent unit fed from cold mains. Flow rate depends on mains pressure and the unit’s rated power (kW). Notifiable electrical work.³⁷ Sometimes seen as the primary shower in HA-managed estate housing in Pollards Hill, St Helier and Mitcham.

If you’re planning a bathroom upgrade and the existing system can’t support the new shower or fittings, a system upgrade (combi to system boiler, vented to unvented cylinder, etc.) may be needed before the bathroom installation. That’s a Boiler Installation Merton conversation. Where a bathroom project also involves central heating system upgrades, discuss a magnetic filter and inhibitor with the installer — see Central Heating Repair Merton.

Merton-specific signals

Merton’s housing stock and street pattern shape bathroom plumbing callouts across the borough. The borough sits in a hard-water area, and housing stock spans Victorian / Edwardian terraces in the west through 1930s suburban semis to interwar and post-war estates in the east and south.

The following are local editorial observations, not official data — drawn from local trade experience and the borough’s confirmed area-by-area mix.

Wimbledon and west Merton (SW19, SW20). Victorian and Edwardian terraces are common, with many properties retaining original bathroom layouts that date from later 20th century retrofits. Original cast-iron baths remain in some properties — substantial weight, often needing two-person handling for replacement, and joist load assessment for new freestanding cast-iron suites in upper-floor bathrooms.

In converted flats, bathroom installations engage shared stack risers and party-wall pipework. Managing-agent or freeholder permission is normally needed for any work that touches communal drainage or affects neighbouring flats. Soil pipe re-routing in conversions often surfaces the limits of what’s possible without major structural work.

Conservation area constraints on visible external fabric — soil pipe terminations, extractor flue terminations, wall vents on front or visible elevations — apply in (among others) the John Innes (Merton Park) and John Innes (Wilton Crescent) conservation areas, both subject to Article 4 directions.⁵³

Raynes Park and west Merton (SW20). 1930s suburban semis with original bathroom layouts — typically a single bathroom on the upstairs landing with a separate WC in some properties. En-suite additions in extensions and loft conversions are a common refurbishment scope. Airing-cupboard cylinder constraints affect en-suite hot water layouts where cylinders can’t be relocated easily.

Colliers Wood and South Wimbledon (SW19). Mixed stock — older terraces with original bathroom layouts, alongside newer flat developments with consistent en-suite-and-main-bathroom layouts. Modern flats often have small bathroom footprints and back-to-back layouts (your bathroom shares plumbing with the next-door flat); soil and waste re-routing in such flats is constrained.

Mitcham and east Merton (CR4). Interwar and post-war housing estates with consistent bathroom layouts. Some HA-managed properties have heating and bathroom maintenance contracts that affect what work can be commissioned independently. A meaningful share of the private-rented stock in east Merton is in the borough’s selective licensing wards (Figge’s Marsh, Graveney, Longthornton, Pollards Hill).⁵⁰

Pollards Hill (CR4). Concentration of large estate housing. Bathroom work in HA-managed properties routes through the housing association; private leaseholder bathrooms in former-council blocks book directly with managing-agent permission for shared services.

Morden (SM4). 1930s suburban housing and the St Helier estate. Standardised bathroom layouts typical of the period. Hard-water-related fittings wear (taps, mixer cartridges, shower heads, electric shower elements) is a recurring service-life issue.

Motspur Park and Lower Morden (SW20 / SM4). Low-density 1930s housing with typical period bathroom layouts. Refurbishment scope often includes en-suite additions in primary bedrooms and second bathrooms in larger properties.

Hard water across the borough. Merton’s hard-water area accelerates scale build-up on tap cartridges, mixer cartridges, shower heads, electric shower elements, and thermostatic mixer valves (TMVs). Cartridge replacement frequency may be higher than in soft-water boroughs, and power shower pumps may have shorter service life. Mixer valve scaling can present as reduced flow, fluctuating temperature, or stuck handles — sometimes mistaken for valve failure when the underlying issue is scale. See our London Hard Water Guide.

Conservation areas. Internal bathroom plumbing does not engage conservation-area controls. External fabric changes (visible soil pipe replacement, new external vents, ducting through visible elevations) can engage controls — that’s a planned-work conversation rather than a fittings-installation one.

Housing association tenants

Merton Council does not own any council housing. Following a tenants’ ballot, all the council’s former housing stock was transferred in March 2010 to Merton Priory Homes (now part of Clarion).⁵²

If you’re a housing-association tenant, bathroom installations and significant repairs are normally arranged by the housing association — typically through a national maintenance contractor on contract. Your housing association may have a planned bathroom replacement programme that determines when bathroom upgrades happen.

For housing-association tenants:

• Check your tenancy agreement or recent correspondence for your housing association’s repairs / out-of-hours line. Most major associations have separate routing for emergencies (foul water surcharging, complete loss of toilet, escape of water) and for non-emergency repairs.
• A faulty tap or non-functioning shower in mild conditions is normally a non-emergency repair raised through the standard repair line.
• Foul water flooding, complete loss of toilet (in single-toilet properties), or escape of water from bathroom pipework should be raised as an emergency.
• Directory plumbers cannot bill the housing association on your behalf, and may decline to work on installations covered by the housing association’s planned programme or maintenance contract.
• If you want to upgrade your bathroom beyond what the housing association is providing, check tenancy terms first — some associations require permission for tenant-funded improvements.

If your housing association is not responding to a serious bathroom plumbing repair, Merton Council’s Tenants’ Champion can help you escalate.⁵¹ The council’s Housing Enforcement team can also intervene where housing-association repair failures meet the threshold for action.

Leaseholders

If you own a leasehold flat in Merton, your lease sets out which bathroom works are your responsibility (typically all fittings and pipework serving your flat alone) and which are the freeholder’s, managing agent’s or housing association’s (typically shared stack risers, lateral drains, structural waterproofing, the building’s connection to drainage and water supply).

Leaseholder repair responsibilities usually depend on the lease; communal/shared services normally route through the freeholder or managing agent.

Merton-specific leaseholder bathroom considerations:

• Former council blocks (now Clarion-managed). A meaningful number of Merton leasehold flats are in former council blocks following the 2010 transfer to Merton Priory Homes (now Clarion).⁵² The freeholder is often a housing association rather than a private landlord or commercial managing agent. Leases typically follow the original council lease structure, which can have detailed conditions on bathroom alterations — particularly waste pipe re-routing, soil-stack connections, and any work affecting the flat below.
• Converted Victorian and Edwardian houses (Wimbledon, west Merton). Leases in converted houses often have stricter constraints on bathroom alterations than purpose-built flats, because waste runs and party-wall pipework are shared. Wet-room installation, soil-stack relocation, and any work affecting the floor structure normally requires licence for alterations under the lease.
• Modern flat developments (Colliers Wood, South Wimbledon). Block insurance and managing agent rules typically require notification before any bathroom installation that involves work to the flat’s floor, ceiling, or shared services. Some developments have approved-contractor lists for bathroom work.

For bathroom installations affecting the building structure or shared services (significant soil pipe re-routing, work that affects the flat below or the building’s external fabric), freeholder or managing agent permission is normally needed before any work starts. Most leases also require licence for alterations for material works — check before commissioning a full bathroom refurbishment.

For straightforward fittings replacements (like-for-like suite, taps, shower units) within an existing bathroom, leaseholders normally don’t need freeholder consent, but check your lease.

Private renters and landlords

If you rent privately in Merton, your landlord (or their managing agent) is normally the first contact for bathroom plumbing repairs. Repair to the installation for water supply and sanitation is likely to engage Section 11 repair duties, for tenancies covered by Section 11 of the Landlord and Tenant Act 1985.¹³

Notify the landlord or agent in writing as soon as a bathroom plumbing fault arises — running leaks, broken fittings, lost water supply, blocked sanitation. Tenants may be liable where the fault is caused by misuse, neglect of reported issues, or breach of tenancy terms.

If your landlord is unresponsive and the disrepair affects health, safety or sanitation, Merton Council’s Housing Enforcement team can intervene.⁵¹ The council expects you to have notified the landlord first.

Selective licensing and bathroom-condition implications:

If your home is in one of Merton’s selective licensing wards (Figge’s Marsh, Graveney, Longthornton, Pollards Hill) or additional HMO licensing wards (those four plus Colliers Wood, Cricket Green, Lavender Fields), licence conditions cover ongoing repair obligations including sanitary fittings and water supply.⁵⁰ For bathroom-condition specifically:

• Persistent leaks, broken fittings, or sanitary disrepair in licensed properties may trigger licence-condition compliance review alongside normal housing enforcement routes.
• HMO bathroom provision may be assessed under HMO standards and licence conditions; landlords should check Merton’s current HMO standards/licensing requirements.
• Bathroom decommissioning during a refurbishment in an HMO needs alternative bathroom provision arranged for tenants.
• Tenants in licensed HMOs may raise bathroom-condition concerns with the council’s licensing team as well as housing enforcement.
• Article 4 directions for small HMOs (C3-to-C4 conversion) now apply borough-wide across Merton — bathroom additions or reconfigurations as part of HMO conversion engage planning permission alongside Building Regulations, not just Building Regulations alone. See the Selective Licensing and HMOs in Merton section below for the ward breakdown.⁵⁸

Landlords arranging bathroom installations or significant repairs should book directly. Documenting the work (written quote, invoice, photographs, dates) supports both the buildings insurance position and any subsequent regulatory enquiry.

Selective Licensing and HMOs in Merton

Merton Council operates property licensing schemes that affect private rented homes, alongside the national mandatory HMO licensing scheme. Schemes and ward designations can change over time — full and current scheme detail is on Merton Council’s current property licensing pages.⁵⁰

• Selective licensing (24 September 2023 to 23 September 2028): all single-family or two-sharer private rented homes in Figge’s Marsh, Graveney, Longthornton and Pollards Hill wards.⁵⁰
• Additional HMO licensing (24 September 2023 to 23 September 2028): smaller HMOs (typically three or four occupiers forming more than one household, sharing kitchen or bathroom facilities) in Colliers Wood, Cricket Green, Figge’s Marsh, Graveney, Lavender Fields, Longthornton and Pollards Hill wards, where the property is not already covered by the mandatory HMO licensing scheme.⁵⁰
• Article 4 directions for small HMOs — permitted development rights for conversion from dwellinghouse (Use Class C3) to small HMO (Use Class C4) have been removed across Merton. The original direction (in force from 17 November 2022) covers Colliers Wood, Cricket Green, Figge’s Marsh, Graveney, Lavender Fields, Longthornton and Pollards Hill. A further immediate direction covering 13 additional wards — Abbey, Cannon Hill, Hillside, Lower Morden, Merton Park, Ravensbury, Raynes Park, St Helier, Wandle, West Barnes, Wimbledon Park, Wimbledon Town and Dundonald and Village — started on 24 March 2026, with a public consultation period ending 19 June 2026, and is subject to subsequent confirmation. Larger HMOs are controlled separately through planning use class rules.⁵⁸
• Mandatory HMO licensing (national): HMOs occupied by five or more people from two or more households sharing basic amenities. Mandatory licence conditions are set out in Schedule 4 of the Housing Act 2004.⁴⁰

A plumber attending a bathroom installation in a licensed HMO will not enforce licence conditions — that’s the council’s role — but if the visit surfaces installation problems (insufficient bathroom provision, persistent disrepair, unsafe electrical work in special locations), the landlord must address those issues to remain compliant.

Indicative bathroom plumbing costs in Merton

The figures below are an editorial estimate only, observed across independent contractors and directories in early 2026. They are not regulated rates, not official market data, and not based on a published cost survey. No UK regulatory body publishes standard bathroom plumbing rates. Prices vary materially by spec, fittings choice, access, structural complexity, and whether other trades are included in the quote. Figures are not a substitute for written quotations.

Merton-specific cost factors that may affect the figure:

• Hard-water-related fittings replacement. Borough-wide; mixer cartridges, TMVs, shower heads and electric shower elements may have shorter service life than in soft-water boroughs. Cartridge replacement at the time of bathroom refurbishment may be a sensible upgrade.
• Period property structural complexity. Wimbledon and west Merton’s Victorian and Edwardian properties may need joist reinforcement for cast-iron bath weight, soil pipe re-routing for changed layouts, and lath-and-plaster ceiling reinforcement for tile loading.
• Conservation area and listed building constraints. External fabric changes in (among others) the John Innes (Merton Park) and John Innes (Wilton Crescent) conservation areas may engage conservation-area planning controls — internal-only bathroom work normally does not.
• Flat coordination. Bathroom installations in converted houses (Wimbledon, Colliers Wood) and modern apartment blocks need managing-agent or freeholder permission for any work affecting shared stack risers or party-wall pipework.
• HA-managed property constraints. Bathroom installations in housing-association-managed properties in Pollards Hill, St Helier and similar areas route through the association rather than independent commissioning.

Confirm pricing structure (call-out fee, hourly rate, parts mark-up, additional trade charges) when you contact the plumber. For full bathroom installs, expect a detailed survey-based quote rather than a phone estimate.

Why directory-listed plumbers

Every plumber in our directory has been checked for identity, insurance, trading presence and Gas Safe registration where relevant before listing, and rechecked annually. Listing checks are administrative only and do not guarantee workmanship quality or ongoing compliance. For full verification methodology, see How we verify plumbers.

We are not a regulator or certification body; our listing checks do not replace user verification on the day.

Gas Safe registration applies only where gas appliances or pipework are involved — not general bathroom plumbing. For bathroom electrical work specifically, ask whether the plumber holds Part-P competence themselves or coordinates with a registered electrician. Notifiable electrical work in bathrooms must be certified through an Approved Document P route.³⁷ For unvented hot water cylinder work, ask for evidence of competence and competent person scheme registration (Approved Document G Part G/G3).⁵⁶

Some plumbers offer workmanship guarantees of 3, 6 or 12 months — look for the badge on the listing. Workmanship guarantees are set by individual plumbers and vary in scope; they are not standardised, and are not insurance-backed unless a plumber explicitly states otherwise. Statutory rights under the Consumer Rights Act 2015 still apply.

Public liability insurance is not a statutory requirement for plumbers, but it is industry-standard and is often contractually required by clients, landlords, agents, blocks of flats or commercial sites. Evidence of public liability insurance was provided at the time of listing; users should confirm current cover with the contractor before booking.

Listing checks are completed before publication and repeated annually. Always confirm pricing, scope and call-out terms on the call before booking.

Frequently asked questions – Bathroom Plumbing Merton

Areas covered

Directory plumbers cover Merton borough addresses across SW19, SW20, SM4, CR4, SW16, SW17, SW18 and KT3 — including:

• Wimbledon (SW19, SW20)
• Wimbledon Park (SW19)
• South Wimbledon (SW19)
• Colliers Wood (SW19)
• Merton Park (SW19, SW20)
• Crooked Billet (SW19)
• Raynes Park (SW20)
• Cottenham Park (SW20)
• Copse Hill (SW20)
• Motspur Park (KT3, SW20 — partly)
• Morden (SM4)
• Lower Morden (SM4)
• Morden Park (SM4)
• St Helier (SM4 — partly, also Sutton)
• Mitcham (CR4)
• Mitcham Common (CR4 — mostly)
• Bushey Mead (CR4)
• Pollards Hill (CR4 — partly)
• New Malden (KT3 — partly)
• Norbury (SW16 — partly)
• Southfields (SW18 — partly)
• Summerstown (SW17 — partly)

Postcodes can extend beyond borough boundaries; the wards above are the parts within Merton.

Related services

• Tap Repair / Installation Merton
• Toilet Repairs Merton
• Leak Detection Merton
• Boiler Repair Merton
• Boiler Installation Merton
• Central Heating Repair Merton
• Emergency Plumber Merton
• General Plumbing Merton

Related guides

• London Hard Water Guide
• London Plumbing Costs & Compliance Guide 2026
• How to Read a Plumbing Quote
• Victorian Terrace Plumbing Guide — London 2026
• New Homeowner Plumbing Guide — London 2026
• Landlord Plumbing Compliance Checklist

Closing

A bathroom installation or refurbishment in Merton turns on three things: getting the right scope on the right fittings (suite spec, shower system, hot water provision compatibility), managing the regulatory framework (Building Regulations Part G/G3 for hot water, Part P for notifiable electrics in special locations, Part F for ventilation, building control where structural alterations engage), and coordinating the trades (plumber, electrician, tiler) so the bathroom comes together to finish standard.

In Merton specifically, hard-water-related fittings wear, period-property structural constraints in Wimbledon and west Merton, and HA-managed-property routing in east-borough estate housing all shape what’s commissionable independently versus what routes through other parties. Bathroom electrical work involving new circuits, consumer unit changes, or additions/alterations within zones may be notifiable under Part P. Unvented hot water systems require competent person installation under Part G/G3.

Merton no longer has council-owned housing — housing-association tenants route through their association’s repairs / planned-replacement programme; leaseholders book their own plumber for bathroom work in the flat with managing-agent involvement for shared services and structural alterations. Plumbers covering bathroom plumbing in Wimbledon, Mitcham, Morden, Colliers Wood, Raynes Park and surrounding Merton areas are listed at the top of the page. Confirm pricing, scope and call-out terms on the call — before any work starts.

Source provenance

Regulatory and safety guidance on this page is drawn from primary UK sources: HSE (gas safety, CO awareness, gas emergency number 0800 111 999), the Gas Safety (Installation and Use) Regulations 1998, the Landlord and Tenant Act 1985 (Section 11), the Housing Act 2004 (Schedule 4 — licence conditions), Approved Document G (sanitation, hot water safety and water efficiency), Approved Document P (electrical safety in dwellings — including special-location rules and BS 7671 as the recognised standard for compliance with Part P), Approved Document F (ventilation), the Consumer Rights Act 2015 (statutory rights apply alongside any workmanship guarantee), and Merton Council (housing advice, property licensing, Tenants’ Champion, Housing Enforcement, conservation areas, council not owning housing stock — transfer of Merton Council’s former housing stock in March 2010 to Merton Priory Homes, now part of Clarion).

Approved Documents provide guidance on meeting Building Regulations requirements; they are not the law itself. BS 7671 is the recognised standard for compliance with Part P but is not legislation itself.

Cost figures are an editorial estimate only — not regulated rates and not official market data, and not a substitute for written quotations. Merton-specific signals are local editorial observations, not official data, drawn from local trade experience and the borough’s housing-stock mix across the postcodes and areas listed above.

Sources

¹ HSE — Domestic gas safety FAQ. https://www.hse.gov.uk/gas/domestic/faqs.htm ⁵ Gas Safe Register — Check An Engineer. https://www.gassaferegister.co.uk/find-an-engineer-or-check-the-register/check-an-engineer/ ¹³ Landlord and Tenant Act 1985, Section 11. https://www.legislation.gov.uk/ukpga/1985/70/section/11 ¹⁵ HSE — Check an engineer – are they Gas Safe registered? https://www.hse.gov.uk/gas/gas-safe-register-check.htm ¹⁷ HSE — Carbon monoxide awareness. https://www.hse.gov.uk/gas/domestic/co.htm ³⁷ GOV.UK — Approved Document P (electrical safety in dwellings; bathroom and other special-location rules; BS 7671 as recognised standard). https://www.gov.uk/government/publications/electrical-safety-approved-document-p ³⁹ GOV.UK — Smoke and Carbon Monoxide Alarm (Amendment) Regulations 2022 (landlord/tenant explanatory booklet). https://www.gov.uk/government/publications/smoke-and-carbon-monoxide-alarms-explanatory-booklet-for-landlords/the-smoke-and-carbon-monoxide-alarm-england-regulations-2015-qa-booklet-for-the-private-rented-sector-landlords-and-tenants ⁴⁰ Housing Act 2004, Schedule 4 (mandatory licence conditions). https://www.legislation.gov.uk/ukpga/2004/34/schedule/4 ⁵⁰ Merton Council — Property licensing for landlords and letting agents (selective and additional licensing schemes; designation 24 September 2023 to 23 September 2028). https://www.merton.gov.uk/council-tax-benefits-and-housing/private-housing/licensing ⁵¹ Merton Council — Tenants’ Champion and Housing Enforcement (housing condition complaints and tenant escalation). https://www.merton.gov.uk/council-tax-benefits-and-housing/housing-advice/tenants-champion and https://www.merton.gov.uk/council-tax-benefits-and-housing/private-housing/complaints-about-the-condition-of-private-housing ⁵² Merton Council — Apply for social housing (Merton Council does not own any council housing; stock transferred in March 2010 to Merton Priory Homes, now Clarion). https://www.merton.gov.uk/council-tax-benefits-and-housing/getting-a-new-home/apply-social-housing and https://www.merton.gov.uk/council-tax-benefits-and-housing/housing-advice/housing-associations-tenancy-rights ⁵³ Merton Council — Conservation areas (overview, including Article 4 directions in John Innes Merton Park and Wilton Crescent). https://www.merton.gov.uk/planning-and-buildings/design-conservation/conservation-areas ⁵⁶ GOV.UK — Approved Document G (sanitation, hot water safety and water efficiency; G1 cold water supply, G3 hot water, G4 sanitary conveniences, G5 bathrooms; competent person installation requirements for unvented cylinders). https://www.gov.uk/government/publications/sanitation-hot-water-safety-and-water-efficiency-approved-document-g ⁵⁷ GOV.UK — Approved Document F (ventilation; Volume 1 dwellings; extract ventilation requirements for bathrooms and habitable rooms; intermittent or continuous extract rates; openable windows providing purge ventilation). https://www.gov.uk/government/publications/ventilation-approved-document-f ⁵⁸ Merton Council — Article 4 directions removing permitted development rights (immediate Article 4 Direction for small HMOs in seven wards from 17 November 2022 confirmed permanent 19 April 2023; immediate Article 4 Direction for small HMOs in 13 wards from 24 March 2026 subject to consultation by 19 June 2026). https://www.merton.gov.uk/planning-and-buildings/planning/permitted-development-and-prior-approval/article-4