How much does leak repair cost?

What the job involves

A leak repair is two jobs in one: finding exactly where the water is escaping, then fixing it properly. The second part is usually the easier one. A dripping tap, a weeping valve or a compression joint that has worked loose can often be sorted quickly. The hard part is when the water shows up in one place but starts somewhere else, such as a stain on a ceiling, a damp patch on a wall or a floor that feels cold and soft.

A plumber will normally start by isolating the water, either at a local isolation valve or at the main stopcock, and checking what is wet and what is dry. Depending on the situation, the fix might be:

• Replacing a washer, cartridge or whole tap that is dripping at the spout or spindle.
• Tightening, re-making or replacing a joint on copper, plastic or flexible pipework.
• Replacing a failed isolation valve, radiator valve or stopcock.
• Cutting out a split or pinhole section of pipe and fitting a new length.
• Replacing a worn tap connector or flexible hose under a sink or basin.

This guide covers a single leak. If there are several, or the pipework is generally tired, the job becomes a different one, and a repipe of part of the system may make more sense than repeated patching.

Leaks on gas pipework are not a plumbing repair. If you smell gas, open windows, turn off the supply at the meter if you can do so safely, leave the property and call the national gas emergency number. Any gas repair must be done by a Gas Safe registered engineer.

What affects the price

Two leaks that look alike can cost very different amounts. These are the main factors:

• Where the leak is. A leak under a sink with clear access is far quicker than one behind a tiled wall, under a fitted bath or beneath a floor. Anything that needs lifting, cutting or removing before the plumber can reach the pipe adds time.
• How hard it is to find. A visible drip from a joint costs little to diagnose. A hidden leak may need moisture checks, pressure testing, or listening equipment, and that diagnostic time is often charged separately from the repair.
• The type of pipe and fitting. Copper, plastic, lead and old steel pipes all behave differently. Older or unusual pipework can be harder to join to, and parts may be less readily available.
• The part that has failed. A washer is cheap. A cartridge, a specialist mixer tap or a concealed valve costs more, and so does the labour to swap it.
• Whether the system must be drained. If a heating system or tank has to be drained down and refilled, that adds time. Heating systems may also need re-pressurising and checking afterwards.
• Access to isolation. If there is no working isolation valve and the stopcock is seized, the plumber may have to deal with that first, which adds to the job.
• Urgency and timing. Emergency call-outs, evenings, weekends and bank holidays are usually priced higher than a booked weekday visit.
• Location. Labour rates and parking or congestion costs vary across the UK, which is why local prices matter.
• Making good. Fixing the pipe is separate from repairing plaster, tiles, flooring or decoration. Many plumbers do not include this, so check.
• Call-out and minimum charges. Many plumbers charge a minimum for attending, with the repair time on top.

Ways to keep the cost down

• Stop the water first. Know where your stopcock is and turn it every so often so it does not seize. Shutting off the water early limits damage, which can be the most expensive part of a leak.
• Clear the area. Empty the under-sink cupboard or move furniture so the plumber can get at the pipe straight away.
• Describe the problem accurately. Note where it drips, when it happens (only when a tap is on, or constantly), and whether the water meter moves when everything is off. This saves diagnostic time.
• Group small jobs. If you have a dripping tap, a weeping radiator valve and a slow-closing isolation valve, have them done in one visit rather than paying for separate call-outs.
• Avoid emergency rates where you can. If you have isolated the leak and nothing is getting damaged, a booked daytime visit is usually cheaper than an immediate one.
• Get more than one quote for larger jobs. For anything involving opening up walls or floors, compare at least a few written quotes, and compare them against the prices on this page.
• Check your insurance. Home insurance may cover the resulting damage, and sometimes the cost of finding the leak, though not usually the repair of the pipe itself. Read your policy before work starts, and keep photos and receipts.
• Do not delay. A slow leak left alone can rot timber and damage ceilings, which turns a small repair into a big one.

What should be included in a quote

Ask for the quote in writing, even if it is just an email or text. It should cover:

• [ ] A clear description of the leak and the repair being proposed.
• [ ] Whether finding the leak (diagnosis) is included or charged separately.
• [ ] Labour, and whether it is a fixed price or based on time.
• [ ] Parts and materials, with any significant parts named.
• [ ] Call-out or minimum charges.
• [ ] Whether the work involves lifting floors or opening walls, and who makes good afterwards.
• [ ] Whether draining down and refilling the system is included.
• [ ] Disposal of old parts and waste.
• [ ] VAT, if the plumber is VAT registered.
• [ ] What happens if a bigger problem is found, and how you will be told before extra costs are added.
• [ ] Any guarantee on the workmanship.

Questions to ask a plumber

• Can you tell me what you think has failed, and how sure are you before opening anything up?
• Is the price fixed, or could it change once you see the pipework?
• Will you test the repair before you leave, and for how long?
• If the leak is hidden, what is your plan for getting to it, and who repairs the finish afterwards?
• Is the pipework generally in good condition, or is this likely to happen again?
• Do you carry the part with you, or will it need a second visit?
• Do you offer a guarantee, and is it in writing?
• If the leak is on or near a heating system, are you qualified to work on the boiler side too, or only the pipework?

How long it takes and what to expect

A simple tap, valve or joint repair with good access is often done in a single short visit. Leaks that are hidden, in awkward places or need parts ordered take longer, and a second visit may be needed if the part is not to hand or if materials need time to dry before making good.

On the day, expect the plumber to turn off the water, protect the floor, find the source, and make the repair. They should then turn the water back on and check for drips at the joint and nearby. Water may be off for a while, so fill a kettle and some containers beforehand if needed.

After the repair, keep an eye on the area for a few days. Check that it stays dry, and if the damp patch was the first sign, remember that walls and ceilings can take time to dry out. If a stain keeps growing, call the plumber back.

Signs a quote is too cheap or too expensive

Possibly too cheap:

• The plumber gives a firm price over the phone without seeing the leak or asking questions.
• There is no mention of testing, guarantee or making good.
• The quote is vague, such as just "fix leak", with no detail.
• They suggest a temporary patch without telling you it is temporary.
• They ask for full payment up front, or a large cash deposit with nothing in writing.

Possibly too expensive:

• A large price with no breakdown of labour, parts and call-out.
• A full replacement is proposed when a simple repair would do, with no explanation why.
• Extras are added on the day that were not discussed beforehand.
• The price sits well above the prices on this page for similar jobs in your area, with no clear reason such as difficult access or a hidden leak.

A fair quote is specific, explains the reasoning and leaves you clear about what is and is not included. If something does not add up, ask. A good plumber will be happy to explain.