Find checked plumbers in Merton for washing machine and dishwasher installation, replacement and removal — supply connections, waste arrangements, isolation valves, levelling, and Water Regulations compliance.

✅ 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.

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Contact one or more plumbers directly from the listings above. Listings are rechecked periodically — confirm credentials and insurance directly with the contractor before booking. Workmanship guarantee availability is shown on each listing where offered.

When you contact a plumber, confirm:

• Install type — like-for-like swap, first-time install, integrated appliance, relocation, or reconnection after a kitchen refit.
• Appliance type — freestanding washing machine, integrated washing machine, freestanding dishwasher, integrated/built-in dishwasher, washer-dryer.
• Whether the appliance has been delivered already, or whether the plumber is asked to remove and dispose of an old appliance.
• Whether the connection points exist and are in working order (washing machine valves, waste standpipe or trap connection, electrical socket on a suitable circuit).

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.

No working water on the property right now, or active leak from a damaged supply pipe? See Burst Pipes Merton for immediate isolation guidance, or Emergency Plumber Merton for out-of-hours.

Right page for your problem

• New washing machine or dishwasher install — you’re on the right page.
• Like-for-like replacement — you’re on the right page.
• Reconnection after a kitchen refit — you’re on the right page (or Kitchen Plumbing Merton if multiple kitchen plumbing tasks).
• Integrated / built-in dishwasher install (sometimes requires fitting integrated door panel, kickplate cut-outs) — you’re on the right page; check that the plumber is comfortable with integrated installs.
• Washer-dryer install — you’re on the right page.
• First-time install where no connection points exist (new pipework runs needed, new electrical circuit needed) — you’re on the right page; the plumber may sub-contract or coordinate with an electrician for the circuit work.
• Multiple kitchen plumbing tasks at once (sink, taps, and appliance connections) — see Kitchen Plumbing Merton.
• Leak from existing washing machine inlet hose, valve or waste connection — see Burst Pipes Merton for immediate, or this page if it’s a planned replacement / repair.
• Appliance fault rather than installation issue — appliance-repair scope (manufacturer warranty service or appliance-repair specialist), not normally plumbing scope.

What’s covered

The list below isn’t exhaustive — but it captures the everyday washing machine and dishwasher installation work directory plumbers cover.

Washing machine installation:

• Connecting cold water inlet (and hot water inlet, where applicable for the model) to existing washing machine valves. Many modern washing machines are cold-fill only, but installers should check the manufacturer’s instructions for the specific appliance.
• Connecting the waste hose to the standpipe or trap arrangement (sink trap with washing machine spigot, or dedicated standpipe).
• Levelling and securing the appliance, releasing transit bolts, removing transit packaging.
• Initial fill / drain test cycle to confirm no leaks, correct waste discharge, no excessive vibration.
• Removing and disposing of an old appliance, where agreed in advance.

Dishwasher installation:

• Connecting cold water inlet (occasionally hot water inlet on certain models) to existing valve.
• Connecting waste hose to sink trap with dishwasher spigot, or to dedicated waste arrangement.
• For integrated / built-in dishwashers — fitting the integrated door panel and adjusting kickplate cut-outs (some plumbers prefer the kitchen fitter handle integrated panel work).
• Levelling and securing into the cabinet space.
• Initial fill / drain test cycle.
• Removing and disposing of an old appliance, where agreed in advance.

First-time installs (no connection points):

• New cold water valve install — usually teed off the cold supply under the kitchen sink with an appropriate isolation valve (lever quarter-turn or compression).
• New waste connection — fitting a sink trap with appliance spigot, or running a dedicated waste with a trap and standpipe.
• Coordinating the electrical socket — appliances normally plug into an existing suitable socket. New circuits or socket alterations are electrical scope, not plumbing scope.

What’s not normally in scope:

• Major appliance circuit electrical work (new ring final circuit, new radial circuit, fuseboard work) — electrical scope under Approved Document P (Building Regulations) for notifiable work.⁷
• Appliance manufacturer warranty repairs — a plumber installing your appliance does not normally also act as the manufacturer’s warranty service agent.
• Built-in / integrated cabinetry work — fitting kitchen cabinets, drawers, kickplates is normally kitchen fitter scope, although some plumbers handle the integrated dishwasher door panel as part of the install.

Install-day commissioning checklist. Before the plumber leaves, the following should be confirmed: appliance levelled, transit bolts removed (washing machine), inlet hose not kinked, waste hose secured at correct height per manufacturer instructions, isolation valve accessible, test cycle run, and no leaks visible.

For diagnosis and scoping, contact directory-listed plumbers above.

Water Regulations and backflow protection

Washing machines and dishwashers are subject to the Water Supply (Water Fittings) Regulations 1999, which set requirements for water fittings and backflow protection across all premises connected to the public water supply.⁵⁹

Many modern appliances incorporate manufacturer-designed backflow protection, although compliance depends on the complete installation arrangement. The installer must still ensure the complete connection complies with the Water Supply (Water Fittings) Regulations 1999 and the appliance manufacturer’s installation instructions.⁵⁹

The practical install considerations:

• Washing machine inlet hoses should be in good condition and replaced when they show signs of bulging, cracking or kinking. Failed inlet hoses are a common cause of escape-of-water claims.
• Spigot connection on a sink trap. The appliance drain hose connects to the trap spigot; hose routing should follow the appliance manufacturer’s instructions to reduce backflow or siphoning risk.
• Standpipes and trap connections should follow the appliance manufacturer’s installation instructions, including required hose height/routing.
• Isolation valves at appliance connections allow individual isolation for service and replacement.

WRAS approval or equivalent UK-recognised product certification may support compliance, but the installed fitting and arrangement must still comply with the Regulations.

For commercial-grade appliances or applications using more aggressive chemicals (commercial laundry, commercial dishwashing with specialised detergent injection), higher fluid category protection may apply. Requirements depend on the appliance type, contamination risk and installation design under the Water Supply (Water Fittings) Regulations 1999.⁵⁹ See Commercial Plumbing Merton.

Electrical work — Part P

Plugging an appliance into an existing suitable socket outlet is not normally notifiable electrical work. However, installing a new circuit, consumer unit work, or certain electrical alterations may be notifiable under Approved Document P (Building Regulations) and should be carried out by a competent electrician — registered under a competent person scheme such as NICEIC or NAPIT, or notified to building control.⁷ ³⁷

The existing socket and circuit must still be suitable, correctly protected and in safe condition. In practice, most washing machine and dishwasher installs use existing kitchen socket outlets on existing circuits — no new electrical work needed. Where a new circuit is needed, the plumber will normally coordinate with or refer to an electrician.

Hard water in Merton — appliance implications

Merton is generally a hard-water area; check hardness by postcode with Thames Water or SES Water depending on the address.⁶³ ⁷³ Thames Water confirms that all water in their region is hard due to the chalky limestone geology underlying south-east England.⁶³

Hard water can contribute to reduced lifespan and efficiency in washing machines and dishwashers:

• Heating element scaling is a common hard-water issue — scale buildup can reduce efficiency and shorten element life. Manufacturer-recommended descaling (running a hot maintenance cycle with descaler periodically) is normal hard-water-area service-life maintenance.
• Salt-based softening in dishwashers — many dishwashers have an integral water softener that uses dishwasher salt. Where present, keep the salt reservoir topped up; this protects the dishwasher’s internal components from scaling.
• Whole-house water softening is a common upgrade in hard-water areas and may help reduce scale-related appliance wear. Where installed, softened water is normally plumbed to washing machines, dishwashers, hot water systems and most cold water taps. Drinking water taps are typically kept on the unsoftened mains supply.
• Detergent dosing — softer water needs less detergent; manufacturer guidelines for detergent dosing are normally based on water hardness category.

For broader prevention discussion, see our London Hard Water Guide.

Common installation issues in Merton properties

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). Older Victorian and Edwardian terraces with kitchen extensions to the rear. Cold water supply and waste arrangements can be tight in older properties where the kitchen has been retrofitted into a former scullery or extension.

Raynes Park and west Merton (SW20). 1930s suburban semis, often with upgraded kitchens and standardised appliance bays.

Colliers Wood and South Wimbledon (SW19). Mixed stock — older terraces and modern flats. Kitchen layouts vary from period retrofits to standardised modern arrangements.

Mitcham and east Merton (CR4). Interwar and post-war housing. Older properties may have older fuseboards that an electrician should review if a new circuit is needed.

Morden (SM4). 1930s suburban housing. Many properties have refurbished kitchens with modern appliance arrangements.

Pollards Hill (CR4) and St Helier estate. Larger HA-managed estates. Plumbing in HA-managed properties typically routes through the housing association — tenants may need to report repairs through the housing association rather than appointing a contractor directly. Check tenancy paperwork for the right route.

Modern flats (across the borough). Many newer developments have isolation arrangements at each fitting. Shared supply risers and waste stacks need managing-agent permission for work that engages them.

For estate / HA-managed properties, check with the housing association before booking a private plumber — appliance install may be part of a managed maintenance scope. Many former Merton Council homes are now managed through Clarion Housing or other registered providers — check tenancy or managing-agent documentation before arranging works.⁵²

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

A plumber arriving for a washing machine or dishwasher install will normally inspect the connection points (cold inlet valve, waste, electrical socket), confirm the appliance specification matches, install the appliance (level, connect, secure, release transit bolts), commission and test with an initial cycle, and confirm operation. They can provide an invoice or written job record where agreed. Disposal of the old appliance is normally an extra; agree this in advance.

Directory-listed plumbers will not normally:

• Carry out new dedicated electrical circuit work — this is notifiable under Approved Document P and normally electrician scope under a competent person scheme.⁷ ³⁷
• Provide manufacturer warranty repair — appliance warranty service is normally through the manufacturer’s authorised service agents.
• Fit kitchen cabinets, drawers, kickplates, or worktops — kitchen fitter scope. Some plumbers will handle the integrated dishwasher door panel as part of the install — check on the call.
• Carry out asbestos-related work — older properties may have asbestos-containing materials in kitchen flooring, wall finishes or pipework lagging; if disturbance is suspected, asbestos-removal scope sits with a licensed contractor.
• Take responsibility for an appliance that fails out of warranty due to manufacturing defect — workmanship guarantee covers the plumber’s installation work, not the appliance itself.

Indicative installation costs in Merton

Figures below are an editorial estimate only — observed across independent contractors and directories in early 2026, not regulated rates, and not a substitute for written quotations. Prices vary by job complexity, access, and existing connection points.

Confirm pricing structure (call-out, fixed quote, parts mark-up, disposal charge) when you contact the plumber.

Merton-specific cost factors that may affect the figure:

• Period property kitchens. Wimbledon and west Merton terraces with retrofitted kitchens may have tight connection arrangements requiring small bespoke pipework.
• Hard-water descaling expectations. Borough-wide; periodic descaling is normal service-life maintenance, not a defect.
• Integrated installs. Integrated dishwasher door panel work adds time; agree scope in advance.
• First-time install with new circuit. Will involve an electrician for notifiable Part P work.

Tenants and landlords

For tenants in Merton, washing machine and dishwasher install context depends on whether the appliance is supplied with the tenancy or installed by the tenant.

• Tenancy-supplied appliances. White-goods provision varies by landlord — check your tenancy agreement or landlord repairs policy. If the appliance is supplied as part of the tenancy, the landlord will normally be responsible for repair and replacement subject to the tenancy terms.
• Tenant-supplied appliances. Usually a tenant responsibility for install, maintenance and removal at end of tenancy. Many tenancies require permission for new water connection work that alters the property’s pipework.
• Section 11 repair duty. Repair to the installation for water supply (cold water valves, pipework that supplies the appliance) is likely to engage Section 11 of the Landlord and Tenant Act 1985 for tenancies in scope.¹³ The Renters’ Rights Act 2025 changed the private assured tenancy regime from 1 May 2026; Section 11 repair duties continue to sit alongside the new regime.⁶⁰
• HMO / licensed properties. Merton operates property licensing schemes — see Merton Council’s property licensing pages.⁵⁰ Merton says permitted development rights have been removed across the borough for C3-to-C4 small HMO conversions, meaning planning permission is required. Larger HMO proposals may require planning permission under separate planning rules.⁶¹

For unresolved housing-association repairs, Merton Council’s Tenants’ Champion can help escalate.⁵¹ For full landlord plumbing compliance detail, see our Landlord Plumbing Compliance Checklist.

Why directory-listed plumbers

Every plumber in our directory is checked for identity, insurance, trading presence and Gas Safe registration where relevant before listing, and listings are rechecked periodically. Verification checks are administrative only and do not assess technical competence or guarantee workmanship or ongoing compliance. For full verification methodology, see How we verify plumbers.

We are not a regulator or certification body; verification checks do not replace user verification on the day. Gas Safe registration is only relevant where gas work is undertaken — washing machine and dishwasher installation alone does not require Gas Safe registration.

For appliance installs, ask whether the plumber is familiar with Water Fittings Regulations compliance and whether fitted parts (valves, hoses, traps, isolation arrangements) are suitable for potable-water use.

Some plumbers offer workmanship guarantees of 3, 6 or 12 months — look for the badge on the listing. Workmanship guarantees vary in scope, are not standardised, and are not insurance-backed unless explicitly stated. Guarantees usually cover installation workmanship only and commonly exclude appliance faults, consumables, accidental damage and manufacturer defects. Statutory rights under the Consumer Rights Act 2015 still apply.

Public liability insurance is not statutory for plumbers but is commonly requested by landlords, agents, blocks and commercial clients. Plumbers are asked to provide evidence of public liability insurance before listing; confirm current cover directly with the contractor before booking.

Always confirm pricing, scope and credentials on the call before booking.

Areas covered

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

• Wimbledon, Wimbledon Park, South Wimbledon, Wimbledon Village (SW19)
• Colliers Wood, Merton Park, Crooked Billet (SW19)
• Raynes Park, Cottenham Park, Copse Hill (SW20)
• Motspur Park (KT3, SW20 — partly)
• Morden, Lower Morden, Morden Park (SM4)
• St Helier (SM4 — partly, also Sutton)
• Mitcham, Mitcham Common, 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

• Kitchen Plumbing Merton — for multi-task kitchen plumbing
• General Plumbing Merton — stop tap repairs, isolation valves, pipework
• Commercial Plumbing Merton — commercial laundry / commercial dishwasher
• Burst Pipes Merton — burst inlet hoses, escape of water
• Emergency Plumber Merton — out-of-hours

Related guides

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

Closing

Washing machine and dishwasher installation in Merton is straightforward in most modern properties — existing connection points, like-for-like replacement, 30–90 minute install for straightforward existing-connection installs. First-time installs, integrated appliances, and properties with seized valves take longer and cost more. Hard water is a general Merton-area consideration; periodic descaling is normal service-life maintenance and whole-house water softening may help reduce scale-related appliance wear where suitable.

Plumbers covering washing machine and dishwasher installation in Wimbledon, Mitcham, Morden, Colliers Wood, Raynes Park and surrounding Merton areas are listed at the top of the page. Confirm scope, pricing, insurance and credentials on the call — before any work starts.

Sources

⁷ Approved Document P — Electrical safety (Building Regulations). https://www.gov.uk/government/publications/electrical-safety-approved-document-p ¹³ Landlord and Tenant Act 1985, Section 11. https://www.legislation.gov.uk/ukpga/1985/70/section/11 ³⁷ Building Regulations competent person schemes (NICEIC, NAPIT for electrical work). https://www.gov.uk/building-regulations-competent-person-schemes ⁵⁰ Merton Council — Property licensing for landlords and letting agents. https://www.merton.gov.uk/council-tax-benefits-and-housing/private-housing/licensing ⁵¹ Merton Council — Tenants’ Champion and Housing Enforcement. https://www.merton.gov.uk/council-tax-benefits-and-housing/housing-advice/tenants-champion ⁵² Merton Council — Apply for social housing (2010 stock transfer to Merton Priory Homes / Clarion Housing). https://www.merton.gov.uk/council-tax-benefits-and-housing/getting-a-new-home/apply-social-housing ⁵⁹ Water Supply (Water Fittings) Regulations 1999. https://www.legislation.gov.uk/uksi/1999/1148/contents/made ⁶⁰ Renters’ Rights Act 2025 (Royal Assent 27 October 2025; Commencement No. 2 Order — Chapter 1 of Part 1 in force 1 May 2026 for private assured tenancies). https://www.legislation.gov.uk/ukpga/2025/26/contents and https://www.legislation.gov.uk/uksi/2026/421/note/made ⁶¹ Merton Council — Article 4 directions removing permitted development rights for C3-to-C4 small HMO conversions across the whole borough. https://www.merton.gov.uk/planning-and-buildings/planning/permitted-development-and-prior-approval/article-4 ⁶³ Thames Water — Hard water in your area. https://www.thameswater.co.uk/help/water-and-waste-help/water-quality/hard-water ⁷³ SES Water — Water quality and hardness (postcode hardness checker). https://seswater.co.uk/your-water/water-quality

Last reviewed: May 2026. Reviewed by the VerifiedPlumbers editorial team for regulatory accuracy. Source links are provided within this page where relevant.