Gas engineers in London,covering the north west24 hours a day
Boiler installations, repairs, servicing and landlord certificates across London, from a Gas Safe registered team based in Harrow.
20 years
trade experience
24/7
emergency cover in London
£10m
public liability cover
Up to 10 yrs
boiler warranties
Local to London
Heating and gas engineering in London
Where we work in London
Our base in Harrow puts us in North West London, and we cover homes across London. Call us to check availability for your postcode.
Getting to you
We work from Banner House, 29 Byron Road, Harrow, and cover London as part of our regular London area. Our emergency service runs 24 hours a day, 7 days a week. When you call, we'll give you an honest arrival time for London based on that day's bookings, rather than a promise we can't keep.
Homes in London
London's housing is hugely varied: Victorian and Edwardian terraces, interwar suburbs, converted flats, mansion blocks and modern apartment buildings. Each brings different boiler positions, flue routes and hot water needs.
Heating services for London homes
Heating needs in London homes can include combi boiler replacements, breakdown repairs, landlord gas safety certificates, and heating upgrades in converted flats and extended terraces.
Services in London
Everything your heating needs, available in London
Boiler Installation in London
Worcester Bosch and Vaillant approved installs with up to 10-year manufacturer warranties.
Bespoke quote after survey
Get a quote for boiler installation
Boiler Servicing in London
Annual boiler service from £100 to keep your boiler safe, efficient and within warranty.
From £100
Get a quote for boiler servicing
Boiler Breakdown & Repair in London
Fast diagnosis and repair to get your heating and hot water back on.
Get a quote for boiler breakdown & repair
Emergency Boiler Repair (24/7) in London
Breakdowns and heating faults handled 24 hours a day, 7 days a week.
Get a quote for emergency boiler repair (24/7)
Landlord Gas Safety Certificate (CP12) in London
Fixed-price CP12 certificates for landlords at £75.
£75
Get a quote for landlord gas safety certificate (cp12)
Heating Fault Finding in London
Accurate diagnosis of cold radiators, pressure loss, noisy systems and control faults.
Get a quote for heating fault finding
Power Flushing & Radiator Installation in London
Clear sludge from your system and add or replace radiators.
Get a quote for power flushing & radiator installation
Hot Water Cylinder Installation & Repair in London
Unvented and vented cylinders installed, replaced and repaired.
Get a quote for hot water cylinder installation & repair
Heat Pump Installation & Servicing in London
Air source heat pump installation and servicing across Hertfordshire and London.
Get a quote for heat pump installation & servicing
Underfloor Heating Installation & Maintenance in London
Wet underfloor heating installed and maintained for even, comfortable warmth.
Get a quote for underfloor heating installation & maintenance
Smart Heating Controls in London
Smart thermostats and controls to manage your heating from your phone.
Get a quote for smart heating controls
General Plumbing in London
Leaks, taps, toilets, pipework and general plumbing repairs.
Get a quote for general plumbingWhy choose us in London
Proof, not promises
J&L Gas & Renewables Limited brings 20 years of trade experience to homes in London and across London. We're Gas Safe registered (number 961481), so you can check us on the Gas Safe Register before we arrive.
As approved installers for Worcester Bosch and Vaillant, we can offer manufacturer warranties of up to 10 years on new boilers fitted in London. Copper pipework carries our 10-year guarantee, and every job is covered by £10 million public liability insurance.
CP12 certificates are £75, boiler servicing starts from £100, and a combined visit starts from £150. If anything isn't right after an installation, we commit to putting it right until you're fully satisfied.
Gas Safe registered
No. 961481
Approved installers
Worcester Bosch & Vaillant
24/7 service
Breakdowns in London, day or night
£10m insured
Public liability cover
10-year guarantee
On copper pipework
Clear pricing
CP12 £75 · service from £100
Local issues
Common heating problems in London homes
Converted flats
Flats in converted houses often have boilers in small cupboards and complex flue routes. Correct installation and annual safety checks are essential.
Hard water
Most of London has hard water. Limescale is a common cause of noisy, inefficient boilers and poor hot water.
Older terraces
Victorian terraces often have long pipe runs, old radiators and sludge build-up.
Landlord demand
London's large rental market means annual CP12 checks are a regular need for landlords and agents.
Our process
How a job in London works, step by step
01
Call or send the form
Tell us what you need and your postcode. You speak to us directly, any time of day.
02
Clear price
CP12 £75, servicing from £100 and combined visits from £150; a written quote after survey for installations.
03
Gas Safe engineer attends
A registered engineer arrives, inspects and diagnoses before any work starts.
04
Work & testing
We complete the job, then test for safe, correct operation of heating and hot water.
05
Handover & guarantee
We explain what was done, register warranties and fix any installation issue until you're satisfied.
In flats, the boiler is often in a kitchen cupboard or hallway with a flue through an outside wall or into a shared duct. When the boiler is replaced, the flue position, condensate route and ventilation all need to meet current regulations, which sometimes means the new boiler can't go exactly where the old one was. We check this at survey so there are no surprises on installation day.
In terraced houses, combi boilers are popular because they free up the space a cylinder and loft tank would take. For larger households, though, a system boiler and cylinder can deliver better hot water to more than one bathroom at once.
Whatever the property, an annual service helps prevent breakdowns, keeps manufacturer warranties valid, and lets us catch limescale and sludge problems early. Boiler servicing starts from £100.
Before you call, it helps to have your boiler's make and model, any fault code shown on the display and the pressure reading to hand. If you're a landlord, let us know how to arrange access with your tenant or agent. We'll explain the options and price before any work begins in London, and payment is by bank transfer on invoice.
Plan ahead
A simple heating checklist for London homeowners and landlords
Late summer: service the boiler
Book your annual boiler service before the heating goes on. Small faults found in September are far cheaper to fix than a breakdown in January, and the service record keeps your warranty valid. Servicing starts from £100.
Autumn: check radiators and controls
Turn the heating on early to check every radiator in your London home heats evenly. Cold patches at the bottom point to sludge; cold at the top means air. Make sure timers and thermostats are set for winter routines.
All year: keep certificates current
Landlords with property in London need a Landlord Gas Safety Certificate every 12 months. Diary the renewal date and book a combined certificate and boiler service from £150 to cover both in one visit.
Nearby areas
Also covering areas near London
From our Harrow base we cover London and the neighbouring towns across North West London and Hertfordshire.
See all areasBanner House, 29 Byron Road, Harrow, HA1 1JR
Questions
London heating FAQs
Can't see your question? Call 07843 900760; our emergency heating service runs 24/7.
Do you serve London?
Yes. J&L Gas & Renewables covers London as part of our service area across North West London and Hertfordshire, working from our base at Banner House, 29 Byron Road, Harrow.
How fast can you reach London?
It depends on the time of day and the jobs already booked. Call 07843 900760 and we'll give you a realistic arrival time for London before you commit.
How much does a boiler service or gas safety certificate cost in London?
Our published prices are as follows. A Landlord Gas Safety Certificate (CP12) is £75, a boiler service starts from £100, and the two combined start from £150. New boilers are quoted individually after a survey.
Do you offer emergency boiler repair in London?
Yes. We run a 24/7 emergency service for boiler breakdowns and heating faults in London. If you smell gas, call the National Gas Emergency Service on 0800 111 999 first.
Are your engineers Gas Safe registered?
Yes. We are Gas Safe registered (number 961481), and carry £10 million public liability cover on every job in London.
How often should I service my boiler in London?
Once a year, ideally before winter. Most manufacturers require an annual service by a Gas Safe registered engineer to keep the warranty valid, and it's the best way to avoid a breakdown in the coldest weeks.
Do you install heat pumps and underfloor heating in London?
Yes. Alongside gas boilers, we install and service heat pumps and underfloor heating in London. We assess your home first so you know whether a heat pump will keep it comfortable.
What warranty do I get on a new boiler in London?
As approved installers for Worcester Bosch and Vaillant, we can offer manufacturer warranties of up to 10 years on new boilers. Copper pipework carries our 10-year guarantee.
Which parts of London do you cover?
We focus on North West London, including Harrow, Wembley, Edgware, Stanmore, Pinner, Barnet and Mill Hill. Call us to check your postcode.
Do you work with London letting agents?
Yes. We arrange access with agents or tenants for gas safety checks and repairs.
Need a gas engineer in London?One call gets it sorted.
Gas Safe registered 961481 · 20 years' experience · £10m insured · 24/7 emergency heating service.