24/7 emergency & reactive maintenance · London
Emergency boiler & heating repair in London
No heating or hot water, a leaking boiler or pressure that keeps dropping?
Homes, businesses, landlords and managing agents. One number for the fault, the visit and the next repair step.
1-hour arrival aim, subject to availability. Give us your postcode and fault for the available visit time and charge. Call for an active emergency; the form does not dispatch help.
Loss of heating and hot water can quickly disrupt a household or occupied building. Tell us the system type, symptoms and any vulnerable occupants. We arrange the appropriate heating specialist, with gas work carried out by a suitably qualified Gas Safe registered engineer.
When to call
Problems we can help with
- Boiler breakdown with no heating or hot water
- Rapid or repeated loss of boiler pressure
- Leaking heating pipework or radiator valves
- Heating controls failing to start the system
Safety first
While you arrange help
If you smell gas or suspect carbon monoxide, leave the property and call 0800 111 999 from a safe place. Do not operate electrical switches or use flames. Do not remove boiler covers or interfere with gas fittings.
What the visit can include
- Investigate the boiler, heating controls or system fault reported.
- Complete a suitable repair where safe access and the correct parts allow.
- Explain safe operation, any isolation and parts or follow-up work required.
A breakdown repair is different from routine servicing. Specialist parts, manufacturer attendance or boiler replacement may be needed. Commercial plant and communal heating must be identified when you call.
Detailed heating repair guides & local areasTell us these details when you call
- What is the make, model and visible fault code, without opening the casing?
- Are both heating and hot water affected?
- Are there leaks, pressure changes or occupants especially affected by the loss of heat?
Add the full postcode, a safe contact number and who can arrange entry. Send photos only if you can take them safely.
Know the next step
Your emergency visit and price
Call for the charge for your fault and attendance time, including VAT and what the visit covers. Our small-repair offer starts from £85 including VAT for eligible accessible jobs; it is not a fixed price for every emergency. Parts, specialist equipment and further work are priced separately and need your approval.
We explain the expected arrival and charge when arranging your visit. If the problem needs a temporary make-safe measure first, we explain the permanent repair separately.
From the call to the repair
- Tell us the fault, postcode and any immediate risks.
- Agree the available attendance, access and price.
- The appropriate trade investigates and carries out suitable work, with extra work approved by you.
All 32 boroughs & the City of London
Emergency repair coverage across London
Call with your full postcode, whether you are in Mayfair, Marylebone, Kensington, Fulham, Camden, Islington, Stratford, Greenwich, Croydon or another London neighbourhood. The groups below help you find the existing local repair guides; postcode districts can cross borough boundaries and some postal areas extend beyond London.
Central London
Postcode areas include W1, WC1, WC2, EC1, EC2, EC3, EC4, SW1. Give the full address for attendance.
City of Westminster heating guide City of London heating guide Camden heating guide Kensington and Chelsea heating guideNorth London
Postcode areas include N, EN. Give the full address for attendance.
Barnet heating guide Enfield heating guide Haringey heating guide Islington heating guide Camden heating guideNorth West London
Postcode areas include NW, HA. Give the full address for attendance.
Brent heating guide Harrow heating guide Barnet heating guide Camden heating guideWest London
Postcode areas include W, UB, TW. Give the full address for attendance.
Kensington and Chelsea heating guide Hammersmith & Fulham heating guide Ealing heating guide Hounslow heating guide Hillingdon heating guideEast London
Postcode areas include E, IG, RM. Give the full address for attendance.
Hackney heating guide Tower Hamlets heating guide Newham heating guide Waltham Forest heating guide Redbridge heating guide Barking and Dagenham heating guide Havering heating guideSouth East London
Postcode areas include SE, BR, DA. Give the full address for attendance.
Southwark heating guide Lewisham heating guide Greenwich heating guide Bexley heating guide Bromley heating guideSouth West London
Postcode areas include SW, KT, SM, CR, TW. Give the full address for attendance.
Wandsworth heating guide Lambeth heating guide Merton heating guide Richmond upon Thames heating guide Kingston upon Thames heating guide Sutton heating guide Croydon heating guideFor a managed building, tell us who can provide access to shared supplies, plant rooms or neighbouring premises. A shared-system fault may need the building manager involved.
Reactive repairs for commercial properties
Report the affected equipment or area, impact on trading, access hours and the person authorised to approve work. We help offices, shops, hospitality premises and managed buildings arrange maintenance around their operational needs.
Commercial maintenance solutionsEmergency repair questions
Can I call Mayfair 24 hours a day?
Yes. Contact Mayfair 24/7 for emergency and reactive maintenance across London, including evenings, weekends and bank holidays. Describe the fault and give your full postcode so attendance can be arranged.
How quickly can someone arrive?
We aim for arrival within 1 hour where available. Timing depends on your postcode, the specialist required, current availability and travel conditions. Safe access and weather also affect roofing and other external work. We explain the expected attendance when you call.
How much does an emergency repair cost?
Call for the charge for your fault and attendance time, including VAT and what the visit covers. Our small-repair offer starts from £85 including VAT for eligible accessible jobs; it is not a fixed price for every emergency. Parts, specialist equipment and further work are priced separately and need your approval.
Is no hot water always a boiler fault?
No. Depending on the property, the problem may involve a boiler, cylinder, controls, a communal supply or an individual outlet. Describe which outlets and systems are affected so the visit is directed correctly.
Can I send an emergency through the form?
Call for an active emergency. The form is useful for supporting details or a non-immediate repair, but it does not dispatch an engineer or book attendance.
Speak directly to Mayfair
Request your service quote.
Tell us what’s happening and where. We’ll help you work out the next step and what it costs.
No account needed. No payment to send an enquiry.
For an active emergency, call our 24/7 line on 020 4571 4235. This form does not dispatch an engineer. For immediate danger to people, call 999.
How your repair quote worksOther emergency repair services
Emergency plumbingBurst pipe, water pouring through a ceiling or a leak you cannot stop?24/7 contact · Scope & safety advice 
Emergency electrical repairsPower gone, circuits repeatedly tripping or a damaged electrical fitting?24/7 contact · Scope & safety advice 
Blocked drains & toiletsToilet overflowing, wastewater backing up or several drains blocked?24/7 contact · Scope & safety advice 
Roof leaks & storm damageRain coming in, damaged roof covering or a gutter overflowing into the building?24/7 contact · Scope & safety advice 
Doors, windows & make-safeDamaged door or window leaving your property exposed or unable to close?24/7 contact · Scope & safety advice Official safety and utility guidance
Cadent: gas emergencies · 105: power cuts · Thames Water: sewer flooding. Guidance reviewed 12 September 2026.