Find checked plumbers in Merton for blocked drain clearance — sinks, toilets, baths, external gullies, FOG, root ingress, and CCTV surveys.

✅ Checked before listing — identity, insurance, trading presence, Gas Safe (where relevant).
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✅ Workmanship guarantee badges on listings — 1, 3, 6 or 12 months

Plumbers set their own response times and prices — confirm availability and pricing before booking.

Contact directory-listed plumbers in Merton ↓

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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 response time.
• Diagnostic and clearance pricing (rodding, jetting, CCTV).
• Call-out 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.

Sewer back-up flooding indoors, foul water escaping, manhole overflowing into the property? Contact Thames Water on 0800 316 9800 (free, 24/7) — sewerage is Thames Water’s responsibility borough-wide.²

Slow-running sink, blocked toilet, blocked shower or bath, gully clogged with leaves? That’s internal or private drainage — use the listings above.

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

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

Drain and sewer responsibility — who fixes what

Drain and sewer responsibility is usually explained across internal pipework, private drains, lateral drains and public sewers — each with its own framework. The framework below is drawn from Thames Water’s sewer pipe responsibility guidance and applies borough-wide because sewerage in Merton is Thames Water’s responsibility throughout, regardless of which company supplies your drinking water.³¹

1. Internal waste pipework and private drains (within your property boundary, serving only your property). Includes internal waste pipework, the trap, the run from the outside wall to a manhole on your land, and any drainage that serves only your home. Internal waste pipework and private drains serving only your property are normally your responsibility. A directory plumber clears or repairs this.
2. Lateral drain (outside your boundary, before the public sewer, often serving multiple properties). The run from the property boundary that joins others to reach the main public sewer. **Most eligible private sewers and lateral drains transferred to Thames Water from 1 October 2011.**³¹ Thames Water clears blockages and repairs faults.
3. Public sewer (in the road or under public land). Thames Water responsibility. Highway gullies and kerbside drains are a separate matter — they sit with the local highway authority (Merton Council for non-TfL roads).

If it’s affecting multiple properties or is in the road, contact Thames Water on 0800 316 9800.² If you are unsure, contact Thames Water for guidance.

Right page for your problem

• Kitchen sink, bathroom basin, bath, shower, toilet, washing machine waste, external gully, downpipe blockage, private-drain back-up where the blockage is on your property only — you’re on the right page.
• Sewer back-up, foul water from manhole on pavement or in road, multiple-property drainage failure — Thames Water on 0800 316 9800.²
• Burst pipe, escape-of-water, ceiling leak from a flat above — Burst Pipes Merton
• Hidden slow leak under floors, behind walls, or in screed — Leak Detection Merton
• Blocked road gully or kerbside drain on a Merton-managed road — report to Merton Council. For TfL-managed roads, contact TfL.
• Out-of-hours emergency — Emergency Plumber Merton
• Boiler condensate pipe blocked or dripping — Boiler Repair Merton

Common causes of blocked drains

Drain blockages often have identifiable causes. The points below are for orientation — diagnosis on the day is the plumber’s call, and a CCTV survey may be needed to confirm the underlying cause for a recurring blockage.

• Fats, oils and grease (FOG). A frequently reported cause of kitchen and shared-stack blockages. FOG cools and solidifies inside pipework, narrowing the bore and trapping food debris. Once a FOG-built blockage forms, it tends to recur unless the source habit is addressed.
• Wet wipes, sanitary products and “flushable” wipes. Commonly reported by directory plumbers as a cause of toilet and sewer-side blockages — wipes don’t break down meaningfully in domestic drainage, and they accumulate at junctions, bends, and the connection to the lateral drain. Thames Water advises that only the three Ps (pee, poo, paper) should be flushed.
• Hair and soap scum. A typical cause of slow-running showers and bathroom basins. Builds up at the trap and downstream pipework over time.
• Tree root ingress. Roots find drain joints and grow through any small defect, particularly in older clay pipework. A common cause of repeated blockages on lateral drains in established streets with mature trees.
• Hard-water scale build-up. Less common as a primary cause than FOG or roots, but can be a contributing factor in older copper-tail or galvanised waste runs in Merton’s hard-water area.
• Broken or collapsed pipework. Older clay drains can crack, displace or collapse — particularly under driveways, patios or where heavy vehicles have passed over. A CCTV survey will confirm.
• Surcharge from heavy rainfall. Combined drainage systems can surcharge in extreme rainfall, with foul water backing up into properties at the lowest discharge point. This is a Thames Water sewer-side issue, not a private-drain issue.
• Foreign objects. Children’s toys, jewellery, items dropped down toilets — a recurring cause of sudden, unexplained complete blockages.
• Build-up of food debris from a kitchen sink without proper trap. Less common in modern installs, more common in older terraces and conversions.

For a blockage that’s slowing but not yet completely blocked, addressing the cause early is usually cheaper than waiting for a full clearance.

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

A plumber arriving for a blocked drain call will normally assess the symptom (where the blockage is, what it’s affecting), identify the most likely cause, clear the blockage using the appropriate method (rodding, hand-snake, hydro-jetting, CCTV-guided clearance), leave the system back in service, and advise on whether further investigation is needed (recurring blockage may indicate a structural defect requiring repair).

Many will also offer add-on work — descaling, root-cutting, drain lining (no-dig repair), or excavation for collapsed pipework. These are normally itemised separately from the clearance fee.

Directory-listed plumbers will not normally:

• Repair or clear public sewers — that’s Thames Water’s responsibility. For sewer back-ups, manhole overflows on the pavement or in the road, contact Thames Water on 0800 316 9800.² Most eligible private sewers and lateral drains transferred to Thames Water from 1 October 2011.³¹
• Clear highway drainage / road gullies — that’s the local highway authority’s responsibility (Merton Council for non-TfL roads).
• Work on communal drainage in mansion blocks, converted-flat buildings or estate housing without authorisation from the building manager, freeholder, managing agent or housing association.
• Excavate to repair pipework on land that isn’t the customer’s, without permission from the relevant property owner — adjacent owners’ permission is needed where a drain crosses a boundary.
• Restore notifiable electrics damaged by drain water reaching consumer units or sockets — notifiable electrical work must be certified through an Approved Document P route, such as a registered competent person, third-party certifier or building control.³⁷

For a recurring blockage with no obvious cause, a CCTV drain survey is normally the right next step — it confirms what’s actually wrong (collapse, root ingress, off-set joint, broken pipe) before any repair work is quoted.

CCTV drain surveys

A CCTV drain survey is a common diagnostic for recurring blockages, suspected pipe damage, or pre-purchase property surveys.

A drain survey involves inserting a small camera on a flexible rod into the drain (typically through an external manhole or the toilet pan), and recording video footage of the inside of the pipework. The plumber identifies what’s actually wrong — collapse, root ingress, off-set joints, blockages of specific materials, or simply heavy build-up — and quotes for the appropriate repair.

A CCTV survey is normally recommended:

• After a recurring blockage that returns within weeks of clearance.
• Before a major property purchase where the drainage condition is unknown.
• After an extension or building work where existing drainage may have been disturbed.
• For an insurance claim where evidence of pipe damage is needed (subsidence-related drain damage is sometimes claimable on buildings insurance).

A typical residential CCTV survey takes 30 minutes to an hour. A reputable surveyor should provide a written report with timestamped footage on completion — not just a verbal account on the day. Pricing varies by access and whether clearance is needed first to allow the camera through.

For drain repairs, CCTV survey results normally lead to one of three options:

• Patch lining / cured-in-place pipe (CIPP) repair. A resin-impregnated liner is inserted and cured in place to seal a defect — works for cracks, off-set joints, and minor displacements without excavation.
• Drain lining (full liner). Where a longer section is damaged, a full liner is installed inside the existing pipe — works for clay pipes with multiple defects, root ingress through joints, and old galvanised drains.
• Excavation and replacement. Where the pipe has collapsed beyond repair, excavation and replacement of the affected section is the only option. More expensive and more disruptive than lining.

Some older drains can be lined rather than excavated, depending on CCTV findings, access and pipe condition. A reputable plumber should offer the least-invasive option that solves the underlying problem. If only excavation is offered without considering lining, ask why — sometimes excavation is genuinely the only option (full collapse, severe displacement), but often lining works.

Merton-specific signals

Merton’s housing stock and street pattern shape blocked-drain 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. Sewerage across the borough is Thames Water’s, with the lateral-drain transfer of 2011 covering most multi-property runs.

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

Wimbledon and west Merton (SW19, SW20). Victorian and Edwardian terraces are common, with significant flat conversions over the decades. In converted houses, original cast-iron stack pipework can serve multiple flats — a single FOG blockage in the lower stack can affect every flat above. Mature street trees mean root ingress on older clay lateral drains can be a recurring cause of repeat blockages.

Period property drainage often has more bends, junctions and original clay pipework than newer stock — both of which may contribute to higher blockage rates per property.

Raynes Park and west Merton (SW20). 1930s suburban semis with combined drainage systems typical of the period. Gully and downpipe blockages from autumn leaf litter are often reported. Extensions over the decades have sometimes added new bathroom or kitchen waste runs to drains that weren’t sized for the additional load.

Colliers Wood and South Wimbledon (SW19). Mixed stock — older terraces alongside newer flat developments. In older terraces, shared lateral drains between properties may mean a single private-side blockage can affect multiple residents simultaneously.

In modern apartment blocks, shared service risers carry waste from multiple flats — coordination with the building manager is normally the gating step before any clearance work can start.

Mitcham and east Merton (CR4). Interwar and post-war housing estates with planned drainage networks. Many estate streets have lateral drains serving multiple properties; a blockage at the wrong point can affect a row of homes. Where drainage has been transferred to Thames Water (most lateral drains since 2011), Thames Water is the right contact for blockages affecting multiple properties.³¹

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 Persistent drain disrepair in licensed properties may be relevant to council enforcement or licensing action, depending on the facts.

Pollards Hill (CR4). Concentration of large estate housing with planned drainage networks serving multiple flats and maisonettes. Communal drainage maintenance is normally the housing association’s responsibility — directory plumbers will not normally work on shared drainage without authorisation from the building manager or housing association.

Morden (SM4). 1930s suburban housing and the St Helier estate. Standardised drainage layouts typical of the period. In older installations, clay-pipe lateral drains with deteriorating joints can be a recurring cause of root ingress.

Motspur Park and Lower Morden (SW20 / SM4). Low-density 1930s housing, predominantly family homes with individual private drains rather than shared lateral drains.

Hard water and waste pipes. Hard water is not a primary cause of waste-pipe blockages, but in older copper-tail and galvanised pipework (more common in pre-1960 stock) scale build-up over decades can narrow the bore and contribute to FOG accumulation. A clearance visit on older waste runs sometimes surfaces a recommendation to replace badly scaled tail pipework rather than just clearing the immediate blockage.

Conservation areas and external drainage. Merton has a number of conservation areas including (among others) the John Innes (Merton Park) and John Innes (Wilton Crescent) conservation areas, both of which are subject to Article 4 directions that restrict permitted development.⁵³

Routine internal drain clearance does not engage these controls. External drain repairs that affect visible elevations — replacement of cast-iron downpipes with plastic, new gully covers in front-elevation positions — can engage conservation-area constraints; that’s a planned-work conversation rather than an emergency-clearance 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), and social housing in Merton is now provided by housing associations.⁵²

If you’re a housing-association tenant, drain repairs in your property and on shared drainage are normally arranged by the housing association — typically through a national maintenance contractor on contract.

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 their own 24-hour repairs number for genuine emergencies (foul water surcharging indoors, complete loss of toilet, sewage flooding the property).
• A blocked basin or slow-running shower in mild conditions is normally a non-emergency repair — your housing association will typically attend within their standard repair window.
• Foul water flooding indoors or a complete sewer back-up is an emergency — raise it through the emergency line.
• Directory plumbers cannot bill the housing association on your behalf, and may decline to work on drainage that’s on the housing association’s maintenance contract.

If your housing association is not responding to a serious drain 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 drain works are your responsibility (typically waste pipework serving your flat alone, up to the boundary with shared drainage) and which are the freeholder’s, managing agent’s or housing association’s (typically shared stack risers, lateral drains serving multiple flats, external drainage and the building’s connection to the public sewer).

A meaningful number of Merton leasehold flats are in former council blocks — following the 2010 transfer to Merton Priory Homes (now Clarion), the freeholder is often a housing association rather than a private landlord or commercial managing agent. The lease structure is typically inherited from the original council lease.⁵²

Merton Council does not have a direct role in leaseholder drain disputes.

For a blockage in waste pipework serving only your flat, a directory plumber can attend. For shared stack risers, lateral drains serving multiple flats, or external drainage that affects the building, the freeholder or managing agent (often the housing association) is the starting point — speak to them before booking work that affects shared drainage.

Private renters and landlords

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

In a real drain emergency — foul water surcharging indoors, complete loss of toilet, sewer back-up affecting the property — notify the landlord or agent in writing as soon as possible. Tenants may be liable where the blockage is caused by misuse or breach of tenancy terms (for example, repeatedly flushing wet wipes or pouring fat down the kitchen sink despite warnings).

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

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 drainage. Persistent drain disrepair in licensed properties may also be relevant to licence-condition compliance, alongside normal housing enforcement routes.⁵⁰ Tenants in licensed properties may also raise relevant licence-condition concerns with the council.

Landlords arranging a drain clearance or repair should book directly. Documenting the failure (photos, plumber’s invoice, dates) supports both the buildings insurance position and any subsequent regulatory enquiry. Recurring blockages often indicate an underlying defect — a CCTV survey is normally the right diagnostic step before quoting major repair work.

Selective Licensing and HMOs in Merton

Merton Council operates property licensing schemes that affect private rented homes, alongside the national mandatory HMO licensing scheme. Full scheme detail and the application portal are on Merton Council’s 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.⁵⁶
• 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 drain clearance in a licensed rental will not enforce licence conditions — that’s the council’s role — but if the visit surfaces installation problems (out-of-date gas safety records, missing CO alarms, persistent drain disrepair indicating broken pipework), the landlord must address those issues to remain compliant.

Indicative drain clearance and repair costs in Merton

The figures below are indicative London-market estimates, 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 plumbing rates. Prices vary materially by access, blockage severity, equipment needed, and the cause of the underlying issue.

Merton-specific cost factors that may affect the figure:

• Period property drainage. Older Victorian/Edwardian stock in Wimbledon and west Merton (SW19, SW20) often has more bends, junctions and original clay pipework — both of which can require more time on site for clearance and CCTV.
• Shared drainage coordination. Communal lateral drain or stack riser work in Pollards Hill, St Helier and similar estate housing in east Merton needs the housing association or building manager to authorise access, which can add to lead time and cost.
• Recurring tree-root ingress. Established Merton streets in west Merton (Wimbledon, Raynes Park) and Morden with mature street trees may have lateral drains with persistent root issues — root cutting alone is a temporary fix; lining is the long-term solution but more expensive up front.
• Hard-water contribution. In older copper-tail and galvanised waste pipework, scale narrowing the bore can contribute to FOG accumulation; replacement of badly scaled tail pipework is sometimes recommended alongside the clearance.
• Conservation area external work. Replacement of visible external drainage (cast-iron downpipes, gully covers in conservation-area front elevations including the John Innes conservation areas) may need conservation-area consideration; not normally an emergency-clearance issue.

Confirm the call-out fee, hourly rate, parts mark-up, and minimum charge when you contact the plumber. For recurring blockages, ask whether the plumber recommends a CCTV survey before quoting major repair work — it’s normally cheaper to know the actual cause than to keep paying for clearance visits.

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 and do not replace user verification on the day. For full verification methodology, see How we verify plumbers.

Gas Safe registration applies only to gas appliances and pipework. Drain clearance and repair work does not require Gas Safe registration — for plumbers offering both gas and drainage services, we verify the gas-side competence; for drainage-only work, identity, insurance, and trading-presence checks apply.

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

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.

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 – Blocked Drains 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

• Emergency Plumber Merton
• Burst Pipes Merton
• Leak Detection Merton
• General Plumbing Merton
• Toilet Repairs Merton
• Bathroom Plumbing Merton
• Commercial Plumbing Merton

Related guides

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

Closing

A blocked drain in Merton turns on three things: working out where the blockage is in the network (internal vs private drain vs lateral drain vs public sewer), getting the right scope onto the right defect (clearance, root cutting, lining, excavation), and managing the boundary with Thames Water for anything that’s escaped onto the public side.

In Merton specifically, the borough-wide Thames Water sewerage responsibility simplifies the public-side routing — one number (0800 316 9800), one operator, regardless of whether the property is supplied by Thames Water or SES Water. Repeat blockages with no obvious cause often indicate an underlying issue worth diagnosing with a CCTV survey rather than just clearing again. Some older drains on private property can be lined rather than excavated, depending on CCTV findings, access and pipe condition. Lining decisions on the private side stay with the homeowner; Thames Water handles transferred lateral drains and public sewers.

Merton no longer has council-owned housing — housing-association tenants route through their association’s repairs line; leaseholders book their own plumber for drainage inside the flat with managing-agent involvement for shared drainage. Plumbers covering blocked drains 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 P (electrical safety in dwellings), the Smoke and Carbon Monoxide Alarm (Amendment) Regulations 2022, Thames Water (sewer pipe responsibility, sewer flooding, blockages guidance), and Merton Council (housing advice, property licensing, Tenants’ Champion, Housing Enforcement, conservation areas, council not owning housing stock — transfer to Merton Priory Homes / Clarion in 2010, highway and pavement reporting).

Cost figures are indicative London-market estimates only — not regulated rates and not official market data. Merton-specific signals are editorial observations, 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 ² Thames Water — Incident guide. https://www.thameswater.co.uk/help/incident-guide 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 ²² Thames Water — Pipe responsibility. https://www.thameswater.co.uk/help/water-and-waste-help/leaks/pipe-responsibility ³⁰ Thames Water — Blockages. https://www.thameswater.co.uk/help/water-and-waste-help/sewer-flooding/blockages ³¹ Thames Water — Sewer pipe responsibility. https://www.thameswater.co.uk/help/water-and-waste-help/sewer-flooding/sewer-pipe-responsibility ³⁷ GOV.UK — Approved Document P (electrical safety in dwellings). 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 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

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Last reviewed: May 2026 by Adiel Khan — SFEDI-accredited business advisor 20+ years experience (South East Enterprise Ltd) and operator of VerifiedPlumbers. [LinkedIn ↗]

This page is checked for compliance and regulatory accuracy against HSE, Gas Safe Register, Thames Water and Merton Council guidance. Source links are provided within this page where relevant.