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A dripping tap wastes water and frays nerves; a stiff or leaking one is usually a five-minute part away from fixed. This page lists checked, insured Harrow plumbers who repair, replace and correctly install taps.
✅ Checked before listing — identity, insurance, trading presence, Gas Safe (where relevant). How we verify →
✅ Workmanship guarantee badges on listings — 1, 3, 6 or 12 months
Most tap jobs are a quick parts-and-labour visit — agree the call-out fee and whether parts are included before booking.
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Coverage: Harrow and its HA postcodes — HA1, HA2, HA3, HA5 and HA7, plus the HA8/Edgware and Kenton/Queensbury edges.
What this covers: dripping, stiff or leaking taps, worn cartridges and washers, scaled-up mixers, and supplying and fitting new kitchen, bathroom, basin, bath and outside taps. Listings show their own callout hours.
Not sure it’s a tap? A new kitchen as a whole → Kitchen Plumbing in Harrow; a full bathroom or basin/bath refit → Bathroom Plumbing in Harrow; a leak that isn’t coming from the tap itself → Leak Detection in Harrow.
Costs: see what tap jobs cost — most are modest parts-and-labour jobs.
Jump to: What’s wrong with it · Taps in Harrow homes · By district · Costs · FAQs · Why verified plumbers
What’s wrong with the tap — and what a good install involves
Most tap faults are a worn part, and the type of tap tells you which.
It drips from the spout. On a traditional tap, that’s a perished rubber washer; on a modern lever or mixer tap, it’s the ceramic disc cartridge that’s worn or scaled. Either is a cheap part — but left dripping, it wastes a surprising amount of water and, on a metered supply, money.
It leaks from the base or handle. That’s usually the O-rings or the gland packing around the spindle, not the washer — a different fix, and worth naming correctly so the right part comes in the van.
It’s stiff, stuck or grinding. In Harrow’s hard water that’s often scale on the cartridge or spindle. Sometimes it descales and frees off; often the cartridge is easier and more reliable to replace.
Weak flow from one tap. Frequently a blocked aerator (the mesh on the spout) furred up with scale — sometimes a five-minute clean — or a partly closed isolation valve. If the flow is weak across several taps, or only on the hot side, the issue is more likely the system or pressure than the tap itself.
What a proper installation involves. Fitting a tap is more than tightening two nuts. A good install isolates the supply correctly, uses the right tap connectors and flexible tails, and checks the tap is rated for your water pressure (some need a minimum pressure or aren’t suited to gravity-fed systems). It also means checking the fittings the tap connects to — seized backnuts, corroded flexi tails or a worn isolation valve can turn a quick swap into a longer job, and are best replaced at the same time rather than left to fail next. And on mixer taps, the installer ensures the right backflow protection so that, under back-pressure or back-siphonage, water can’t be drawn back from the basin or bath into the supply — rules that sit within the Water Supply (Water Fittings) Regulations 1999, which govern how fittings connected to the mains must be installed.4
Taps in Harrow homes: hard water, mixers and the kitchen tap
The tap on your sink is the same model sold nationwide — what’s local is the water running through it.
Hard water makes taps wear sooner. Affinity Water records very hard water in Harrow North at 360 mg/l as calcium carbonate.1 That scale is one of the main causes of tap problems locally: it furs up aerators, stiffens cartridges and spindles, and shortens the life of washers and ceramic discs. It’s why a Harrow tap that’s gone stiff or started dripping is often scaled rather than broken — and why fitting a quality cartridge, and descaling the aerator now and then, is money well spent.
Older homes and low pressure. In older Harrow houses with gravity-fed hot water from a loft tank, some modern mixer and monobloc taps can give disappointing flow unless they’re rated for low pressure — so part of getting a replacement right is matching the tap to the system it’s going on, not just the look of it.
Mixer taps and backflow. A mixer brings hot and cold together at one spout, and where it can let water be drawn back into the supply, it needs the right check-valve/backflow protection under the Water Supply (Water Fittings) Regulations 1999 — the kind of detail a proper installer gets right and a “tighten it and go” job often doesn’t.4
The kitchen tap and drinking water. The cold tap at the kitchen sink is the one most people drink from, so it should deliver wholesome water straight from the rising main, not via a stored tank. It’s worth getting this right when a kitchen tap is replaced — particularly in older Harrow homes where a cold supply may historically have run through a loft tank.
Outside taps. Common in Harrow’s houses with gardens — but an outside tap is a classic backflow risk (a hose left in a water butt or pond), so it should be fitted with an internal isolation valve and the correct double check valve, plus a way to drain it down before winter, since an exposed outside tap is a freeze-and-burst point (see Burst Pipes).
Council tenants should report a leaking or broken tap to Harrow Council on 020 8901 2630 rather than arranging a private plumber.3
Find a verified plumber for taps by district
A tap repair is much the same wherever you are — the honest local variation is the age of the fittings, the type of tap and the water pressure. Use the search above, or browse below.
- Harrow on the Hill, Sudbury Hill & West Harrow — period homes that may still have traditional pillar taps and older supply arrangements, where a like-for-like repair or a sympathetic replacement matters.
- Pinner & Hatch End — established suburban housing with a mix of original and updated kitchens and bathrooms, so anything from a washer to a modern mixer swap.
- Harrow town centre & Station Road (HA1) — flats and mixed-use blocks where pressure varies by floor; a tap swap may hinge on finding a working isolation valve under the basin or sink, and where there isn’t one, the managing agent may need to arrange a riser or communal shut-off.
- Stanmore & Harrow Weald — larger homes with multiple bathrooms and en-suites, and often outside taps for bigger gardens.
- Wealdstone — a mix of older and newer homes; everyday cartridge, washer and mixer work.
- Kenton, Queensbury & the Edgware edge — houses and flats on the borough boundary with updated kitchens and bathrooms where mixer and monobloc taps are common.
- South Harrow & Roxeth — family and estate housing where straightforward repairs and replacements are the staple.
The thread running through every district is the hard water — scale on cartridges, spindles and aerators is a common reason a Harrow tap drips, stiffens or weakens.
What tap jobs cost
Most tap repairs and swaps are modest parts-and-labour jobs. The ranges below are an editorial guide only.
| Job | Typical editorial estimate | Notes |
|---|---|---|
| Replace a washer or O-ring | £70–£130 | Traditional dripping tap |
| Replace a ceramic cartridge | £80–£150 | Modern lever / mixer tap |
| Clear / replace a scaled aerator | £60–£110 | For weak flow from one tap |
| Supply & fit a new tap | £100–£220 | Labour; plus the tap itself |
| Fit an outside tap | £120–£280 | With isolation valve and double check valve |
Editorial estimate only. These are illustrative ranges to help you sense-check a quote — they are NOT regulated rates, NOT market data and NOT a published cost survey. Unusual or designer cartridges and seized fittings can need ordering or extra time.
Worth knowing: a dripping tap shows up on a metered bill, so on a meter a quick repair pays for itself — and Affinity Water‘s Home Leaks service can help identify wasted water.2 One local factor: Harrow sits inside London’s Ultra Low Emission Zone, so a non-compliant van pays a £12.50 daily charge to attend;5 it’s outside the central Congestion Charge zone, so that charge doesn’t apply.6
Frequently asked questions
Yes — it’s usually a cheap washer or cartridge, and a constant drip wastes water.
If you’re on a meter, that also means wasted money.
In Harrow’s hard water, it’s often a scaled cartridge rather than a worn one.
Often scale on the cartridge or spindle, common in Harrow.
It can sometimes be descaled and freed off.
A new cartridge is usually the more reliable fix.
Often it’s a scaled-up aerator — the mesh on the spout — which may only need a quick clean.
It can also be a partly closed isolation valve.
If several taps are weak, it points to a system or pressure issue rather than the tap itself.
Not quite.
A tap needs to suit your water pressure and system.
Some taps need a minimum pressure, and some homes need a different type for gravity-fed systems.
Mixer taps and outside taps also need the right backflow protection under the water-fittings regulations.
A plumber will match the tap to your setup.
A worn washer or cartridge is usually a cheap repair.
Replacement makes sense if the tap is corroded or badly scaled.
It also makes sense if you want a different type, such as a monobloc mixer, or you’re updating the kitchen or bathroom anyway.
Why verified plumbers — not a general directory
A tap is the kind of small job where a quick, cash-in-hand fix is tempting — until a poorly fitted mixer has no backflow protection, or a “repair” is really a marked-up part you didn’t need. A checked plumber and a clear price keep a small job small and correct.
Every listing is checked before it goes live and re-verified annually: we confirm the business is legitimately trading and verify the named contact, we check evidence of public liability insurance, and we confirm the plumber covers Harrow’s HA postcodes before a profile is approved — and the workmanship guarantee shown on each listing stands behind the work. As this is water-fittings work — and tap and mixer installation is squarely within the Water Fittings Regulations — you can also look a plumber up yourself on WaterSafe, the free, water-industry-backed register of plumbers trained in those regulations.7
Profiles may be suspended or removed if credentials lapse or credible concerns are raised — see the full verification process →. No customer middleman fee: enquiries go directly to the plumber.
Related areas
Verified plumbers across Harrow’s neighbourhoods, including:
- Belmont
- Canons Park
- Edgware
- Greenhill
- Harrow on the Hill
- Harrow Weald
- Hatch End
- Headstone
- Kenton
- North Harrow
- Pinner
- Pinner Green
- Pinner South
- Queensbury
- Rayners Lane
- Roxbourne
- Roxeth
- South Harrow
- Stanmore
- Wealdstone
- West Harrow
Related services
Other verified plumbing services in Harrow:
- Emergency Plumber in Harrow
- Burst Pipes in Harrow
- Leak Detection in Harrow
- Blocked Drains in Harrow
- Toilet Repairs in Harrow
- General Plumbing in Harrow
- Bathroom Plumbing in Harrow
- Kitchen Plumbing in Harrow
- Washing Machine & Dishwasher Installation in Harrow
- Boiler Repair in Harrow
- Boiler Installation in Harrow
- Boiler Servicing in Harrow
- Central Heating Repair in Harrow
- Commercial Plumbing in Harrow
Related guides
- London Hard Water — Complete Homeowner & Landlord Guide 2026
- New Homeowner Plumbing Guide — London 2026
- How to Read a Plumbing Quote — A London Homeowner’s Guide 2026
- London Plumbing Costs & Compliance Guide 2026
Most tap jobs are small, quick and cheap — a washer, a cartridge, an aerator clean — and in Harrow’s hard water, scale is a common reason a tap drips, stiffens or weakens. Where it matters most is the install: the right tap for your pressure and the correct backflow protection on mixers and outside taps. The plumbers listed here are checked for what matters — verified identity, evidence of insurance, and the credentials behind water-fittings work — so a small job is done right and fairly priced.
Contact verified plumbers in Harrow ↑
← Back to all plumbing services in Harrow → verifiedplumbers.co.uk/london/harrow/
Last reviewed: June 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 the bodies and regulations cited on it (Affinity Water, Harrow Council, WaterSafe, the Water Supply (Water Fittings) Regulations 1999 and TfL). Source links are provided within this page where relevant.
Sources & further reading
- Affinity Water — Harrow North (AF056) water-quality report 2025 (very hard water; 360 mg/l CaCO₃; scale on fittings).
- Affinity Water — Check for water leaks in your home (Home Leaks) (identifying wasted water from a dripping tap).
- Harrow Council — Request a home repair (council-tenant repairs 020 8901 2630).
- The Water Supply (Water Fittings) Regulations 1999 (installation of fittings connected to the mains, including backflow prevention on taps and mixers).
- Transport for London — Ultra Low Emission Zone (ULEZ) (all London boroughs since August 2023; £12.50 daily charge).
- Transport for London — Congestion Charge (central London zone only).