Compare quotes from multiple verified Streatham plumbers
Your enquiry goes straight to the plumbers you pick — no middleman fee
If a tap in Streatham drips, stiffens or loses flow, the cause should be identified before hard water or the tap body is blamed. This page connects you with verified Streatham plumbers for repairing, replacing and installing kitchen, bathroom and outside taps, including the drinking-water and backflow rules that may apply.
✅ Checked before listing — identity, insurance, trading presence, Gas Safe (where relevant).
✅ Workmanship guarantee badges on listings — 1, 3, 6 or 12 months
Typical Streatham tap jobs run roughly £70–£140 to fix a dripping tap or fit a new cartridge, more to supply and fit a new tap — see what it costs below.
Contact verified plumbers in Streatham ↓
Are you a plumber covering Streatham?
Use the search above to find a local expert
Coverage: Streatham’s SW16 core and the SW2 Streatham Hill side — the High Road, Streatham Hill, Streatham Common, Streatham Vale, St Leonard’s and Streatham Wells.
What this covers: dripping and stiff taps, low flow, worn washers and ceramic cartridges, mixer and monobloc taps, outside/garden taps, and new tap installation.
Routing: for a full kitchen or bathroom refit, see Kitchen Plumbing or Bathroom Plumbing; for a running cistern, see Toilet Repairs.
Costs: see What it costs for editorial estimates.
Availability: each plumber sets their own hours; filter the listings accordingly.
Jump to: What’s actually wrong with the tap · Hard water, drinking taps and outside taps · By area · What it costs · FAQs
What’s actually wrong with the tap
The plumber first checks whether water is appearing at the outlet, spindle or handle, tap base, flexible tails or pipe connection. The isolation valves are tested before dismantling, and the hot and cold supplies can be opened separately to identify pressure imbalance or a fault that appears on only one side of a mixer.
A traditional tap dripping from the outlet may have a worn washer, damaged seat or worn body. A lever or mixer tap may use a ceramic cartridge, but leaks can also come from O-rings, swivel-spout seals, loose fixings, base seals, tails or connections. Cartridge replacements are matched by dimensions and spline; sometimes the old cartridge must be removed and measured before the correct or obsolete part can be sourced. Weak flow is checked at the aerator, service valve and flexible tails before mains pressure is blamed.
Repair is sensible where the seat, cartridge, seals and body remain serviceable; replacement is more practical where the body is damaged, badly corroded or the correct part is unavailable. After the work, the plumber repressurises the supplies, tests hot and cold separately and together, checks mixer balance and inspects the outlet, base, tails and joints for leaks.
Hard water, drinking taps and outside taps
Streatham is supplied by Thames Water, which confirms that the regional supply is hard.1 Limescale is a contributing factor because deposits can restrict aerators and interfere with sealing surfaces and moving parts. It is not a complete diagnosis: wear, loose fixings, failed seals, restrictive tails, pressure imbalance and installation faults also need checking.
If a water softener is fitted, the premises must retain at least one conveniently situated tap supplying wholesome drinking water. In a house this is normally over the kitchen sink and is preferably supplied directly before the softener where practicable. The Drinking Water Inspectorate advises against routinely softening the drinking and cooking supply because ion-exchange softeners add sodium and softened water can be more corrosive to some metals.2
Outside taps require backflow protection appropriate to the assessed use. Sole domestic garden watering or washing a personal vehicle is typically fluid category 3 and may use a double check valve; chemical application, ponds, animal use, communal refuse areas, allotments and other higher-risk uses can require fluid-category-5 protection agreed with the water undertaker.3 Any tap or fitting must meet Regulation 4’s appropriate-quality, appropriate-standard and suitability requirements; recognised approvals or certification can provide evidence of compliance but are not the only statutory route.4
Find a verified plumber for tap work by area
Streatham Hill (SW2/SW16) — in converted houses or mansion flats, several undocumented isolation valves may have been added during previous refurbishments, and the working stop valve may be inside a communal riser or controlled by a managing agent.
Streatham town centre & High Road (SW16) — in flats above shops, a leaking tap connection can affect the commercial unit below and isolation or access may need to be coordinated outside trading hours.
Streatham Common & Streatham Vale (SW16) — outside-tap protection depends on the hose use: typical domestic watering may be fluid category 3, while higher-risk uses need stronger protection agreed with the water undertaker.3
Kitchens across the area — where a softener is installed, keep at least one conveniently situated wholesome drinking-water tap, normally at the kitchen sink and preferably connected before the softener where practicable.2
What it costs
| Job (Streatham / SW16) | Typical indicative range | Notes |
|---|---|---|
| Re-washer / re-seat a dripping traditional tap | £70–£120 | Common on period taps |
| Replace a ceramic disc cartridge (mixer/lever) | £80–£140 | Hard-water scaling |
| Supply and fit a new kitchen mixer / monobloc | £120–£250 | Plus the tap if supplied |
| Replace a bathroom basin or bath tap (like-for-like) | £90–£200 | Access-dependent |
| Fit an outside tap with assessed backflow protection | £120–£220 | Protection depends on fluid category and use |
Editorial estimate only. These figures are not regulated rates, not market data and not a published cost survey — a general guide; tap type, access and parts change the price. Always get a written quote.
Streatham is inside the London ULEZ, so a non-compliant vehicle may carry the daily charge; it is outside the central London Congestion Charge zone.5 ULEZ rules can change, so check the current position.
Frequently asked questions
The repair depends on where the leak appears. Water from the outlet may involve a washer, seat or cartridge; water at the spindle, base, tails or pipe joint needs a different repair. Damaged seats, worn bodies and unavailable cartridges can make replacement more sensible.
Often not. Compare flow before and after removing the aerator, confirm the service valve is fully open and inspect restrictive or kinked flexible tails. On a mixer, the hot and cold supplies should be tested separately before the mains pressure or tap body is blamed.
A softener can reduce scale, but the premises should retain at least one conveniently situated tap supplying wholesome drinking water. In a house this is normally the kitchen sink and is preferably connected before the softener where practicable.2
A hose-union tap needs protection appropriate to its assessed use. Domestic garden watering or washing a personal vehicle is typically fluid category 3 and may use a double check valve; higher-risk uses can require fluid-category-5 protection agreed with the water undertaker.3
A like-for-like swap may be within reach of a competent DIYer only where the correct supply can be isolated and the connections are accessible. Shared, seized or undocumented valves, damaged tails and poor access can turn a small job into a leak, so test the isolation before dismantling.
—
Why verified plumbers — not a general directory
Tap work is small but diagnostic: the value lies in confirming the leak point, isolation, component match and connection integrity before choosing a washer, cartridge or replacement tap.
Every listing is checked before going 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 Streatham’s SW16 area before a profile is approved — and we keep an eye on customer feedback gathered from across the web. For water-fittings and softener work you can also look a plumber up yourself on WaterSafe, the free, water-industry-backed national register; where a job involves gas we confirm Gas Safe registration directly with the Gas Safe Register.
Listed plumbers pay a flat monthly fee to be listed. What that fee never buys is the verification itself — every listing is checked on the same terms — and there’s no per-enquiry middleman fee, so your enquiry goes directly to the plumber. Profiles may be suspended or removed if credentials lapse or credible concerns are raised; see the full verification process →.
Related areas
Verified plumbers across Streatham’s neighbourhoods and nearby areas, including:
- Balham
- Brixton Hill
- Furzedown
- Norbury
- Streatham Common
- Streatham Hill
- Streatham Vale
- Tooting Bec
- Tulse Hill
Related services
Other verified plumbing services in Streatham:
- Emergency Plumber in Streatham
- Burst Pipes in Streatham
- Leak Detection in Streatham
- Blocked Drains in Streatham
- Toilet Repairs in Streatham
- General Plumbing in Streatham
- Bathroom Plumbing in Streatham
- Kitchen Plumbing in Streatham
- Washing Machine & Dishwasher Installation in Streatham
- Boiler Repair in Streatham
- Boiler Servicing in Streatham
- Boiler Installation in Streatham
- Central Heating Repair in Streatham
- Commercial Plumbing in Streatham
Related guides
- London Hard Water — The 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
In Streatham, a dripping, stiff or low-flow tap should be diagnosed by leak location, supply, isolation and component condition. Hard-water deposits can contribute, but they do not replace fault-finding; outside-tap backflow protection depends on use, and drinking-water arrangements must remain compliant where a softener is installed.
Contact verified plumbers in Streatham ↑
Last reviewed: July 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 cited on it — Thames Water, the Drinking Water Inspectorate and the Water Supply (Water Fittings) Regulations 1999. Source links are provided within this page where relevant.
Sources & further reading
1. Thames Water — hard water guidance — https://www.thameswater.co.uk/help/water-and-waste-help/water-quality/hard-water
2. Drinking Water Inspectorate — water hardness / hard water and softeners — https://www.dwi.gov.uk/consumers/learn-more-about-your-water/water-hardness-hard-water/
3. Water Regs UK — hose-union taps and fluid-category-3/5 backflow protection — https://www.waterregsuk.co.uk/topics/all-faqs/hose-union-taps-supplying-watering-systems/
4. Water Supply (Water Fittings) Regulations 1999, Regulation 4 — https://www.legislation.gov.uk/uksi/1999/1148/regulation/4
5. Transport for London — Ultra Low Emission Zone — https://tfl.gov.uk/modes/driving/ultra-low-emission-zone</a>