Free Boiler Repair quotes across the UK
A boiler repair engineer diagnoses and fixes faults across gas, oil, and LPG boilers, covering everything from loss of pressure and no hot water to pilot light failures, faulty diverter valves, and broken thermostats. Homeowners also hire them for annual Gas Safe servicing, power flushing sludge-blocked radiators, fitting magnetic filters to protect the heat exchanger, and full boiler replacements when a unit is beyond economic repair. Central heating installation — including new pipework, radiators, and programmable controls — is another common job these engineers handle.
Costs vary considerably depending on whether the fault requires only a minor component swap such as a pump or pressure relief valve, or a full boiler replacement that involves new flue runs, pipework modifications, and commissioning time. Gas Safe registration is a legal requirement for anyone working on gas appliances, which means you are always paying for certified labour rather than unregulated work, and quotes between engineers can differ by hundreds of pounds for identical jobs. Comparing multiple quotes gives you a realistic market rate and makes it easier to spot engineers who inflate parts costs or charge excessive call-out fees.
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Get competing quotes and choose the best combination of price, availability and reviews.
Every tradesperson is checked for experience, insured, and reviewed by previous customers.
Tradespeople working within your area — not national call centres or franchises.
No charge to compare quotes. You only pay the tradesperson you choose to book.
Typical Boiler Repair costs
Call-out & assessment
£24 – £56
Small / straightforward job
£80 – £164
Larger or complex job
£290 – £500
Get 3 quotes to compare local prices in your area.
How to hire a boiler repair engineer
Verify Gas Safe registration first
Ask for the engineer's Gas Safe Register ID card and check it at gassaferegister.co.uk before any work begins — this is a legal requirement, not a formality. Confirm that the card categories cover your specific appliance, as an engineer registered for central heating boilers may not be certified for older open-flued or back boiler systems.
Get a written, itemised quote
A proper quote for boiler work should list the fault diagnosis fee separately, name any parts by make and part number, include VAT, and state whether the call-out charge is deducted from the final bill if work proceeds. Avoid accepting verbal estimates alone, as vague quotes frequently lead to disputed charges once the boiler is already opened up.
Be cautious of condemned-boiler pressure
A red flag specific to boiler work is an engineer who declares a boiler dangerous and requires immediate replacement before providing any written evidence or a second opinion — this tactic is sometimes used to upsell unnecessarily. A genuine unsafe situation will result in the engineer issuing a formal 'Immediately Dangerous' or 'At Risk' warning notice, which they are legally obliged to provide in writing.
Ask about parts availability upfront
Many homeowners focus solely on labour costs but overlook whether the engineer carries common parts for their boiler brand on their van, which can mean the difference between a same-day repair and waiting several days for a part to be ordered. Confirming parts availability before booking — especially for older or discontinued boiler models — can save significant time and a second call-out charge.
Boiler Repair services we cover
Boiler repair engineers across the Trade Quote Network offer Gas Safe servicing, fault diagnosis, power flushing, magnetic filter installation, full boiler replacements, and complete central heating installations.
- Boiler fault diagnosis & repair
- Annual boiler service & check
- Boiler replacement & installation
- Central heating installation
- Power flushing
- Magnetic filter fitting
- Smart thermostat installation
- Radiator repair & replacement
About our Boiler Repair network
Any engineer working on gas appliances must by law be on the Gas Safe Register, and you can verify their registration number and the appliance categories they are approved to work on directly at gassaferegister.co.uk. For oil boiler work, look for OFTEC registration, and for LPG systems check that the engineer holds the appropriate ACS (Accredited Certification Scheme) assessments covering the specific appliance type. Membership of a manufacturer's approved installer scheme — such as Worcester Bosch Accredited Installer or Vaillant Advance — can also signal higher technical competence and may extend parts warranties.
Before the engineer arrives, locate your boiler's make, model, and serial number, as this helps them pre-identify common faults and order parts in advance rather than making an extra visit. Note down any error codes displayed on the boiler's screen, how long the problem has been occurring, and whether it is intermittent or constant, as this information speeds up diagnosis significantly. Make sure the area around the boiler and any loft or airing cupboard access points are clear, and know where your stopcock and gas meter isolation valve are located.
Once a repair or replacement is completed, your engineer must provide a signed Gas Safe completion record for any gas work carried out, and for a new boiler installation this should include the benchmark commissioning checklist, which many manufacturers require to validate the parts warranty. Ask specifically about the labour warranty period the engineer offers on their own work — reputable engineers typically guarantee their repairs for at least 12 months. If a magnetic filter has been fitted or a power flush carried out, request written confirmation as some boiler warranties require evidence of these measures to remain valid.
Frequently asked questions
How do I know if my boiler needs repairing or replacing?
If your boiler is under 10 years old and the fault is straightforward (pressure, ignition, sensor), repair is usually worthwhile. Over 15 years old, or if repair costs exceed half the price of a new boiler, replacement often makes more financial sense. An engineer can advise after diagnosis.
How much does boiler repair cost?
A boiler service costs £60–£120. Fault diagnosis and repair typically costs £150–£400 depending on the part needed. A full boiler replacement (supply and fit) runs £1,500–£3,500 for a mid-range combi from a Gas Safe engineer.
How long does a boiler repair take?
Most boiler repairs take 1–3 hours once the fault is diagnosed. If parts need to be ordered, a second visit is usually required within a few days. A full boiler replacement typically takes one full day.
Do boiler engineers need to be Gas Safe registered?
Yes — by law, anyone working on gas appliances in the UK must be on the Gas Safe Register. Always ask for their Gas Safe ID card and verify it on the Gas Safe Register website before work starts. Unregistered gas work is illegal and dangerous.
Why does my boiler keep losing pressure?
Low pressure is one of the most common boiler faults. It is usually caused by a small water leak in the system, a faulty pressure relief valve, or air in the radiators. Repressurise via the filling loop and bleed your radiators — if pressure drops again within days, book an engineer.
What is a boiler service and how often do I need one?
An annual boiler service involves checking the heat exchanger, burner, flue, seals and controls. It keeps your boiler safe, maintains the manufacturer's warranty, and catches small faults before they become expensive breakdowns. Most manufacturers recommend a service every 12 months.
