London Heating Engineers
Boiler Repair and Servicing in London
Our Gas Safe registered engineers provide boiler repair, annual servicing and central heating work for homes across London. We cover domestic natural gas boilers, urgent breakdowns and planned heating work.
Smell gas? Leave and call the National Gas Emergency Service on 0800 111 999. For suspected carbon monoxide symptoms, get into fresh air and contact NHS 111, or 999 if serious.
For 24/7 emergency boiler repair, call 020 3740 6785. Our phone line is open 24/7.
Call with your postcode, the boiler make and any fault code showing.
- Gas Safe registered: 648977
- Phone line open 24/7
- Same-day appointments available
Smell gas, suspect carbon monoxide or hear a CO alarm?
Leave the property if you smell gas, suspect carbon monoxide or hear a CO alarm, and seek emergency help before booking a repair.
Smell gas: Avoid flames, smoking and electrical switches. Open doors and windows and turn off the gas only if safe. Never enter a cellar or basement to reach the meter. From a safe place, call the National Gas Emergency Service on 0800 111 999.
Suspected carbon monoxide: Get everyone outside into fresh air. For suspected exposure symptoms, seek medical help through NHS 111, or 999 if serious. Then call 0800 111 999, without delaying medical care. Treat a sounding CO alarm as real; carbon monoxide has no smell. Do not re-enter until advised it is safe.
What help does your boiler or heating need?
Missing heating, missing hot water, leaks, pressure loss and fault displays need investigation; a service is suitable for planned maintenance without a known fault. These observations help explain the job but do not identify a failed component.
Leave appliance diagnosis to an engineer. How do I check the engineer is Gas Safe registered?
No heating
Tell us whether all rooms are cold and whether hot water works. Start with the central heating service below.
No hot water
Report whether heating still works and whether the problem affects every hot tap. Choose boiler repairs and fault finding.
Visible water leak
Describe where water appears without opening the casing. Tell us about nearby electrical equipment when arranging boiler repair.
Repeated pressure loss
Note how often pressure falls and any visible leaks. Choose boiler fault finding rather than repeatedly topping up.
Fault code or lockout
Read out the full display and appliance model if safely visible. Choose boiler repair; avoid repeated resets.
Service due without a known fault
Book annual servicing and have the previous service record ready if available. Mention any developing symptoms when booking.
Gas and heating engineer services in London
Our domestic gas and heating services cover boiler repair, servicing, central heating, installation, internal gas pipework, cookers and fires. Browse all boiler and heating services or choose the job below.
Boiler repairs and fault finding
Boiler repair starts with investigating the fault before recommending parts or replacement. Tell us about missing heating or hot water, leaks, pressure loss or lockouts, together with the make, model and full displayed code. The engineer assesses the appliance and relevant controls before confirming the repair needed.
Boiler repair explains the next steps.
Annual gas boiler servicing
Annual servicing is planned maintenance guided by the instructions for your appliance. Depending on the model, this includes inspection, combustion checks and assessment of the flue and ventilation. Ask about the service record and keep it with your appliance documents.
Disclose existing faults when booking annual boiler servicing, as separate investigation or repair may be needed.
Central heating and radiator work
Central heating work investigates the wider system when radiators stay cold or controls do not respond. One cold radiator and a whole home without heating need different checks. Cold patches alone do not establish that a powerflush is needed.
Central heating and radiator repairs cover system faults, with separate options for:
- Radiator repair.
- Radiator replacement.
- Adding or moving a radiator.
Boiler installation and replacement
Boiler installation is available when a new appliance is needed, with repair assessed first for an existing fault. Safety findings, parts availability, repeated failures and repair cost relative to condition help inform the choice.
For boiler installation and replacement, discuss the survey, appliance selection, commissioning, Benchmark documentation and applicable Building Control notification before agreeing the work.
Internal gas pipework and leak repairs
Suspected gas leaks require a call to 0800 111 999 from a safe place before arranging repairs. Once emergency action is complete and the supply has been made safe, internal gas pipework and leak repairs can address fault tracing, repair and appropriate tightness testing. Never attempt gas work yourself.
Gas cookers, hobs and gas fires
Cooker, hob and gas fire work is available through engineers whose qualifications cover the appliance and job.
Cookers and hobs: Arrange gas cooker and hob installation for domestic natural gas appliances.
Gas fires: Discuss gas fire servicing, repair and installation, including the relevant flue and ventilation assessment. Tell us the appliance type when booking.
What to tell us when booking a heating engineer
Give your London postcode, the problem, appliance details and any access restrictions when booking a heating engineer.
Describe the job
Say whether heating, hot water or both have stopped, or whether you need planned maintenance.
Share visible details
Give the make, model and complete fault code if safely accessible. Do not remove covers.
Explain the property
Say whether it has its own boiler or communal heating. For rented homes, identify who arranges access and authorises work.
Discuss the appointment
Check availability, charging terms, what the visit includes and how additional work is agreed.
Looking for a heating engineer near you in London?
Give us your postcode to check London coverage and appointment availability. Our areas we cover directory groups locations across North, South, East, West and Central London.
Homeowners, tenants, landlords and letting agents can enquire about repairs and servicing. Mention whether your home has an individual gas boiler or communal heating, so the enquiry matches the equipment involved.
Boiler and heating guidance before your visit
Our boiler and heating guides explain pressure, fault displays and controls, including where homeowner checks should stop. Follow your appliance’s user instructions. Never open the boiler casing, work on gas or touch mains wiring, and avoid repeated resets.
Gas Safe engineers in London: check who you are booking
Check both the registered business and the attending engineer’s current Gas Safe ID and work categories before gas work begins.
Business registration
All Service 4 U Limited is registered under number 648977.
Engineer identity
Check the photograph and validity of the attending engineer’s ID card.
Relevant qualifications
Check that the listed categories cover your appliance and the work required.
“Gas safety engineer” is not a separate registration. See our Gas Safe registration details.
What affects the cost
What It Costs
These are typical London prices for this work. The price for your job depends on the boiler, the fault, the parts needed and when the work is done.
Typical London prices
- Boiler repair: £125-£375 + VAT
- Boiler service: £75-£125 + VAT
- New combi boiler, supplied and fitted: £1,650-£3,000 + VAT
Typical London price range, plus VAT at 20%. Your price depends on the boiler, the fault, the parts and when the work is done; ask on the call.
Boiler repair, servicing and gas work
Call to book a gas or heating engineer in London
Call us 24 hours a day, 7 days a week to discuss boiler repair, servicing or heating work with Gas Safe registered engineers.
Call 020 3740 6785, with your postcode and problem, or contact All Service 4 U. Same-day appointments are available. Call to check current availability.
For gas or CO concerns, follow the emergency instructions above first.
020 3740 6785
Frequently Asked Questions
Can I check a Gas Safe engineer by name?
A name alone is not enough to confirm current registration and qualifications. Ask for the business registration details and the engineer’s ID, then verify them independently through the Gas Safe Register. Check the card’s photograph, validity and work categories, including whether they cover your appliance and the proposed job.
How often should a gas boiler be serviced?
Arrange a gas boiler service annually and follow your appliance’s maintenance instructions. The manufacturer’s schedule determines the checks required, so keep the service record with the boiler documents. Report a known fault promptly rather than leaving it until routine servicing. Annual maintenance does not prevent every possible breakdown.
How much does a heating engineer cost in London?
The cost depends on the job, investigation, parts, access and appointment timing. Routine servicing, diagnosing a fault and completing a repair involve different work. Call for a price for your job and establish what the appointment charge includes. Ask how parts, further visits and additional work would be charged and authorised before proceeding.
Will missing a service affect my boiler’s manufacturer warranty?
Missing a required service can put a manufacturer warranty at risk, depending on its terms. Check the conditions for your manufacturer and model, including installation or registration dates, service intervals and evidence requirements. Keep service records, including the Benchmark record where applicable, rather than assuming every warranty has identical conditions.
What happens if an engineer finds a fault during a service?
A fault found during servicing may need separate remedial work, and an appliance confirmed unsafe must not remain in use. A reported defect does not automatically mean replacement is necessary. Ask the engineer to explain the finding, any safety instructions, the proposed repair and its cost before authorising additional work. Repairs are not automatically included in routine maintenance.
Is the thermostat faulty, or is it the boiler?
Heating that ignores the thermostat can have a controls, communication, circulation or boiler fault; the symptom alone does not identify the cause. Check only user-accessible settings and schedules according to the control’s instructions. Tell us whether hot water works and whether a code appears. Leave casing removal, wiring and internal diagnosis to an appropriately qualified professional.
Still have a question or need urgent assistance? Call 020 3740 6785, tell us what has happened and we will tell you what happens next.