Emergency Plumber Guide -- London 2026

Leaking Pipe in London? Stop the Water Now -- Then Read This

A 1cm pinhole leak loses 400 litres per hour. Water damage costs average £3,200 to repair. Act in this order.

Emergency: Call 020 0000 0000 Burst Pipe Repair

Do these 6 steps right now -- in order

Shut off your water

Find the internal stop tap -- usually under the kitchen sink. Turn clockwise until it stops. This cuts off your mains supply.

Turn off the boiler

Prevents the boiler running dry and damaging the pump. Switch it off at the control panel.

Open all cold taps

Drains the remaining water in the pipes, reducing what can escape from the leak.

If the ceiling is bulging

Pierce a small hole at the lowest point to let water out in a controlled flow. This prevents a sudden collapse and is far less damaging.

Collect water and move valuables

Place buckets, lay towels, move electronics and documents away from the wet area. Photograph everything for your insurance claim.

Call an emergency plumber

Do not wait. Structural water damage escalates within hours once it reaches joists, plasterwork and flooring.

Where is my internal stop tap?

If you cannot find it in the first 60 seconds, try these locations in order:

Under the kitchen sink (most common)

Below the floorboard near the front door

In the airing cupboard

On the outside wall (external stop tap in pavement -- needs a special key)

Can't find it? Call Thames Water on 0800 316 9800 -- they can locate and shut off the external stop tap in the pavement at no charge.

Diagnosis Guide

6 Types of Leaking Pipe -- Which Do You Have?

Identifying the pipe type before you call means an engineer can arrive with the correct fittings and avoid a second visit.

Compression joint failure

DIY possible

Threaded fittings loosen over time due to vibration or thermal movement. Most common in older London properties. A skilled DIYer can re-tighten or replace the olive.

Typical cost: Engineer: £80-£150

Pinhole corrosion (copper pipes)

London's slightly acidic water (pH 7.2-7.8) attacks copper over decades, creating tiny weeping holes. Common in pipes 20-40 years old. Requires solder repair or section replacement.

Typical cost: £150-£400 depending on location

Lead pipe leak

Found in pre-1970 London properties -- identifiable as a grey, soft metal. Requires full replacement, not repair, due to health risk. Thames Water offers free replacement to the property boundary.

Typical cost: £300-£800 per run

Soldered joint failure

Heat, movement or age separates the solder on copper joints. Requires a plumber to re-solder or cut out and replace the fitting with a push-fit alternative.

Typical cost: £150-£300

Burst pipe (freeze damage)

January-February risk in exposed loft and outside-wall pipes. Frozen water expands and splits copper. See our burst pipe guide for immediate actions.

Typical cost: £200-£800

Read burst pipe guide →

Under-slab or concealed pipe leak

Often only detectable by a pressure test or thermal imaging camera. Pipes buried under concrete floor slabs or hidden in party walls. Access usually requires cutting and reinstatement.

Typical cost: £300-£1,200 depending on access

London Context

Why Leaking Pipes Are a Particular Problem in London

50% of London homes have copper pipework from before 1980

Pre-1980 copper pipes are now well into their failure window. London's slightly acidic water (pH 7.2-7.8) accelerates copper corrosion compared to alkaline areas, producing the pinhole leaks that are the single most common plumbing call-out in the capital.

Lead supply pipes: London's legacy problem

London has more lead supply pipes than any other English city -- a legacy of Victorian infrastructure. Lead is a soft grey metal that corrodes and splits differently to copper. It must be replaced rather than repaired. Thames Water offers free replacement of the section up to the property boundary; the internal section is the homeowner's responsibility at £300-£800 per run.

Victorian terraces: party wall pipe access

Many inner London terraces have supply and waste pipes running through shared party walls between properties. Accessing a leak in a party wall may require the cooperation of a neighbour and, in some cases, a structural engineer's sign-off. Book a plumber who is experienced with Victorian London properties.

While You Wait

Temporary Repair Options (Not Permanent Fixes)

These buy time while you wait for a plumber. They are not permanent solutions -- always get a proper repair.

Pipe repair tape

Self-amalgamating tape wraps around the leak and creates a watertight seal. Holds for several hours to a day. Sold at B&Q for £8-£15.

Push-fit repair sleeve

Slip-on sleeve that clamps over a small section of pipe. Good for accessible pipes. £5-£20 from a plumbers merchant or hardware store.

Pipe freeze kits

Not recommended unless you know exactly what you are doing. Incorrect use can create a burst upstream, making the situation significantly worse.

Repair Costs

Leaking Pipe Repair Cost Guide -- London 2026

Repair Type	Cost (inc. VAT)	Typical Duration
Emergency call-out	£60-£100	Same day
Compression joint re-make	£80-£150	30-60 min
Pinhole solder repair	£150-£300	1-2 hrs
Pipe section replacement	£200-£500	1-3 hrs
Concealed pipe (open floor/wall)	£300-£800	Half day
Lead pipe replacement (per run)	£300-£800	Half-full day
Water damage remediation	£500-£5,000+	Days-weeks

Fixed quote given before any work starts. Emergency call-out fee waived on jobs over 2 hours.

Insurance

Will Home Insurance Cover a Leaking Pipe?

Most standard buildings and contents policies include 'escape of water' cover -- which pays for the damage caused by the leak. The pipe repair itself may or may not be covered depending on your policy wording.

Document everything immediately. Take photos and video of the leak, the damage, the stop tap location, and any items affected. This is your evidence for the claim.

Do not delay repairs. Insurers can reduce or reject claims if damage was allowed to worsen. Fit temporary tape immediately, then get a plumber same day.

Get a plumber's report. Most insurers require a written report stating the cause of the leak. Ask your plumber to provide one -- reputable plumbers do this as standard.

Typical excess. Escape of water excess is usually £100-£300 on home insurance policies. Check your schedule before claiming on small repairs.

Common Questions

Frequently Asked Questions

What should I do first if I have a leaking pipe?

Shut off the internal stop tap immediately -- it is usually found under the kitchen sink. Turn it clockwise until it stops. Then turn off the boiler to prevent it running dry, open all cold taps to drain the system, and call an emergency plumber. If a ceiling is bulging, pierce a small hole at the lowest point to let water drain in a controlled flow rather than risk a ceiling collapse.

How much does it cost to fix a leaking pipe in London?

Costs range from £80-£150 for a simple compression joint re-make up to £300-£800 for a concealed pipe that requires opening a floor or wall. A standard emergency call-out is £60-£100. Pinhole solder repairs typically cost £150-£300. Pipe section replacement runs £200-£500. Lead pipe replacement is £300-£800 per run. All prices include VAT and a fixed quote is given before work starts.

Can I fix a leaking pipe myself?

Some temporary measures are safe for homeowners: pipe repair tape (£8-£15 from B&Q) can wrap around a small leak and hold for several hours, and a push-fit repair sleeve can be slipped over an accessible pipe section for £5-£20. However, these are strictly temporary. Soldering copper pipes, replacing compression fittings inside walls, or working on lead pipes all require a professional plumber. Never attempt to work on gas pipes yourself.

How long can I wait before fixing a leaking pipe?

Do not wait. A 1cm pinhole leak loses around 400 litres per hour. Water damage to floors, ceilings, joists and plasterwork averages £3,200 to remediate once it takes hold, and insurance companies can reject claims if damage was allowed to worsen unnecessarily. If you cannot get a plumber immediately, apply temporary pipe repair tape, shut off the water at the stop tap, and book an emergency plumber for the same day.

Does home insurance cover leaking pipes in London?

Most standard home insurance policies cover 'escape of water' -- the damage caused by a leak -- but not always the cost of repairing the pipe itself. Excess for escape of water claims is typically £100-£300. You must document everything with photos and video, obtain a plumber's report stating the cause, and crucially you must not delay repairs -- insurers can refuse or reduce claims if the damage was allowed to worsen. Some insurers also exclude slow leaks that were pre-existing.

Pipe Leaking Right Now?

Our emergency plumbers cover all London boroughs. Same-day response, fixed quote before any work starts, no call-out fee on jobs over 2 hours.

Call 020 0000 0000 Burst Pipe Repair

No call-out fee on jobs over 2 hours · Available 24/7 · All London boroughs