Gas Leak Repair Cost
£100–£400
typical UK range
Updated
Gas leak repair costs in the UK range from £100 for a simple valve replacement to £400+ for complex pipework repairs or relays. Emergency call-out fees add to the cost, but gas leaks should always be treated as an emergency — cost should not delay calling for help.
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How much does each option cost?
| Type / scope | Typical cost | Notes |
|---|---|---|
| Emergency call-out (evenings/weekends)The call-out fee charged for emergency response, before any repair work begins | £80–£180 | The call-out fee charged for emergency response, before any repair work begins |
| Minor leak — faulty valve or connectionSimple repair: replacing a corroded valve, resealing a joint, or tightening a union. 1–2 hours of work | £100–£200 | Simple repair: replacing a corroded valve, resealing a joint, or tightening a union. 1–2 hours of work |
| Appliance isolation and recommissionIf a specific appliance (e.g. gas cooker) is leaking, it may be isolated, repaired, and recommissioned rather than a pipework repair | £80–£150 | If a specific appliance (e.g. gas cooker) is leaking, it may be isolated, repaired, and recommissioned rather than a pipework repair |
| Gas pipework repair (short run)Replacing a section of pipework — for example, replacing a corroded steel pipe with copper. Depends on length and accessibility | £150–£350 | Replacing a section of pipework — for example, replacing a corroded steel pipe with copper. Depends on length and accessibility |
| Gas pipe relay (longer run or concealed)Relaying a significant length of pipework, or running pipework where the original run is inaccessible (e.g. below a concrete floor) | £300–£800 | Relaying a significant length of pipework, or running pipework where the original run is inaccessible (e.g. below a concrete floor) |
| Tightness test and purgeAfter repairs, the engineer must carry out a tightness test and purge the pipework. Often included in the repair cost but may be charged separately | £80–£150 | After repairs, the engineer must carry out a tightness test and purge the pipework. Often included in the repair cost but may be charged separately |
What affects the price?
- Severity of the leak — a pinhole in accessible pipework takes 30 minutes to repair; a relay of a long inaccessible run can take a full day
- Location of the leak — visible pipework is straightforward to repair; concealed pipework under floors or behind walls requires investigation and possibly floor lifting
- Time of call-out — emergency call-outs in evenings, weekends, or bank holidays carry premium rates. A daytime weekday call-out for a minor leak costs significantly less
- Whether the meter needs isolation — National Gas (formerly Cadent, SGN, Northern Gas Networks) controls the meter; only they can work on the meter itself. The engineer works on internal pipework downstream of the meter
- Age and material of pipework — older properties often have steel pipework that is more prone to corrosion and harder to repair cleanly; modern copper or plastic pipe is easier to work with
- Whether parts must be ordered — if a specialist valve or fitting is required that the engineer doesn't carry, a second visit may be needed, adding to total cost
What's included in the price?
- Initial gas tightness test to locate and confirm the leak
- Isolation of the affected section while repairs are carried out
- Physical repair — valve replacement, joint resealing, or pipework replacement as appropriate
- Tightness test after repair to confirm the fix
- Purging pipework to remove air and restore gas supply safely
- Recommissioning of appliances that were isolated during the repair
How long does it take?
A minor gas leak repair — a faulty valve, a loose joint — can be completed in 1–2 hours. More complex repairs involving pipework replacement can take 3–6 hours or longer if access is difficult. If the leak is in concealed pipework (under concrete or behind tiling), investigation to locate it can add hours. After any gas pipework repair, the engineer must carry out a tightness test and purge — adding 30–60 minutes. In some cases, the full repair will take more than one day if specialist parts must be sourced.
Do I need one?
If you smell gas, hear hissing near a gas pipe or appliance, or receive a carbon monoxide alarm, treat it as an emergency. Open windows, do not use electrical switches, do not smoke or use naked flames, leave the property, and call the National Gas Emergency Service on 0800 111 999 (free, 24 hours). They will attend to make the situation safe — often by isolating the meter. Once the emergency is dealt with, a Gas Safe registered engineer must carry out the repair and tightness test before gas is restored. Never attempt to find or repair a gas leak yourself — gas leaks are potentially fatal.
How do you avoid overpaying?
- Call during normal business hours if the situation allows — an engineer attending during the day on a weekday costs significantly less than an emergency evening or weekend call-out
- Maintain your appliances annually — most gas leaks in appliances arise from aging, worn components that a service would catch before they fail completely
- Don't delay once you suspect a leak — a small leak caught early is typically a minor repair; one left to worsen can result in major pipework replacement or damage from gas accumulation
- Ask for a quote before work begins for non-emergency repairs — a tightness test plus repair quote upfront gives you clarity on the likely total cost
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Frequently asked questions
We’re happy to answer all your questions.
What should I do if I smell gas?
Leave the property immediately — do not switch any electrical switches on or off. Call the National Gas Emergency Service on 0800 111 999 (free, 24 hours) from outside the property or a mobile. Do not return until told it is safe. Once the emergency service has attended and made the situation safe, arrange a Gas Safe registered engineer for the repair.
Who do I call for a gas leak?
First, the National Gas Emergency Service on 0800 111 999 (free, 24 hours) — this is the emergency response, not a repair service. Once they have made the situation safe, call a Gas Safe registered engineer to carry out the repair and tightness test. Do not use an unregistered engineer for gas work — it is illegal.
Can the gas emergency service fix the leak?
National Gas Emergency Service will isolate the supply and make the property safe. They do not carry out internal repairs — they will turn off the meter. A Gas Safe registered engineer must then carry out the repair, tightness test, and purge before gas supply is restored.
How long will I be without gas after a leak?
For a minor, accessible leak that can be repaired in one visit, gas is typically restored within 2–4 hours of the engineer starting work. For complex or concealed leaks requiring investigation and parts sourcing, you may be without gas for 1–2 days. Space heaters and portable hobs are available to buy or hire in the interim.
Does home insurance cover gas leak repairs?
Standard home insurance policies typically cover damage caused by a gas leak (fire, explosion damage) but not the repair of the pipework or appliance itself. Some policies include emergency home cover or boiler cover as an add-on — check your policy documents. Boiler and heating cover (British Gas, HomeServe, etc.) sometimes covers internal pipework repairs.
Sources & References
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