Gas engineer in Harrow,based right here at Byron Roadand on call 24/7
Boiler installations, repairs, servicing and landlord certificates from a Gas Safe registered team whose base is in the middle of Harrow.
20 years
trade experience
24/7
emergency cover in Harrow
£10m
public liability cover
Up to 10 yrs
boiler warranties
Local to Harrow
Heating and gas engineering in Harrow
Where we work in Harrow
Harrow is home. Our base is at Banner House, 29 Byron Road, Harrow, HA1 1JR, so homes across Harrow on the Hill, Harrow Weald, Wealdstone, North Harrow, South Harrow, Rayners Lane, Kenton and Headstone are on our doorstep. Being local means we know the roads, the parking, and the kind of heating systems found behind Harrow's front doors.
Getting to you
We work from Banner House, 29 Byron Road, Harrow, and cover Harrow as part of our regular North West 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 Harrow based on that day's bookings, rather than a promise we can't keep.
Homes in Harrow
Much of Harrow was built during the interwar Metroland expansion, so 1920s and 1930s semi-detached houses with bay windows are everywhere. Many have been extended to the rear or into the loft, which changes how much heat and hot water a home needs. Alongside these are Victorian and Edwardian homes around Harrow on the Hill and Wealdstone, purpose-built flats near the town centre, and a large number of rented homes and HMOs.
Heating services for Harrow homes
Heating needs in Harrow can include combi boiler replacements in extended 1930s semis, annual boiler servicing, breakdowns in the first cold weeks of autumn, and Landlord Gas Safety Certificates for the borough's many rental properties. Loft conversions and rear extensions often mean an older boiler is no longer powerful enough, so system upgrades are common.
Services in Harrow
Everything your heating needs, available in Harrow
Boiler Installation in Harrow
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 Harrow
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 Harrow
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 Harrow
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 Harrow
Fixed-price CP12 certificates for landlords at £75.
£75
Get a quote for landlord gas safety certificate (cp12)
Heating Fault Finding in Harrow
Accurate diagnosis of cold radiators, pressure loss, noisy systems and control faults.
Get a quote for heating fault finding
Power Flushing & Radiator Installation in Harrow
Clear sludge from your system and add or replace radiators.
Get a quote for power flushing & radiator installation
Hot Water Cylinder Installation & Repair in Harrow
Unvented and vented cylinders installed, replaced and repaired.
Get a quote for hot water cylinder installation & repair
Heat Pump Installation & Servicing in Harrow
Air source heat pump installation and servicing across Hertfordshire and London.
Get a quote for heat pump installation & servicing
Underfloor Heating Installation & Maintenance in Harrow
Wet underfloor heating installed and maintained for even, comfortable warmth.
Get a quote for underfloor heating installation & maintenance
Smart Heating Controls in Harrow
Smart thermostats and controls to manage your heating from your phone.
Get a quote for smart heating controls
General Plumbing in Harrow
Leaks, taps, toilets, pipework and general plumbing repairs.
Get a quote for general plumbingWhy choose us in Harrow
Proof, not promises
J&L Gas & Renewables Limited brings 20 years of trade experience to homes in Harrow and across North West 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 Harrow. 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 Harrow, 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 Harrow homes
Extended 1930s semis
A boiler fitted for a three-bedroom semi may struggle once a loft conversion and extension have added two bathrooms and several radiators. Low hot water flow and slow warm-up are typical signs the boiler or system is undersized.
Hard water
Harrow sits in a hard water area. Limescale builds up in combi boiler heat exchangers, hot water cylinders and immersion elements, causing kettling noises and reduced hot water performance. A scale reducer and regular servicing help.
Older pipework and sludge
Many original heating systems in Harrow's interwar homes have been patched and extended over decades. Mixed pipework, old steel radiators and sludge are common, and they shorten the life of a new boiler if not addressed.
Rental properties and HMOs
With a large private rented sector, landlords in Harrow need reliable annual gas safety checks and boilers that won't leave tenants without heat. We combine CP12 checks with servicing from £150.
Our process
How a job in Harrow 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.
If you live in one of Harrow's interwar semis, the boiler you have now may have been fitted before the loft was converted or the kitchen extended. Before replacing it like-for-like, it's worth asking whether it's still the right size and type. A survey looks at how many bathrooms you have, how many people need hot water at once and your mains water flow.
For homes with one main bathroom, a correctly sized combi is often the simplest and most space-efficient choice. Where a loft conversion has added an en-suite, a system boiler with a cylinder may give a better shower experience. We'll explain the trade-offs honestly, give you a written quote, and fit a Worcester Bosch or Vaillant boiler with a manufacturer warranty of up to 10 years.
Landlords in Harrow can save a visit by booking the annual gas safety check together with the boiler service, from £150, so the paperwork and the maintenance are done on the same day.
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 Harrow, and payment is by bank transfer on invoice.
Plan ahead
A simple heating checklist for Harrow 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 Harrow 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 Harrow 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 Harrow
From our Harrow base we cover Harrow and the neighbouring towns across North West London and Hertfordshire.
See all areasBanner House, 29 Byron Road, Harrow, HA1 1JR
Questions
Harrow heating FAQs
Can't see your question? Call 07843 900760; our emergency heating service runs 24/7.
Do you serve Harrow?
Yes. J&L Gas & Renewables covers Harrow 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 Harrow?
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 Harrow before you commit.
How much does a boiler service or gas safety certificate cost in Harrow?
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 Harrow?
Yes. We run a 24/7 emergency service for boiler breakdowns and heating faults in Harrow. 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 Harrow.
How often should I service my boiler in Harrow?
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 Harrow?
Yes. Alongside gas boilers, we install and service heat pumps and underfloor heating in Harrow. 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 Harrow?
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.
Where are you based in Harrow?
Our base is Banner House, 29 Byron Road, Harrow, HA1 1JR.
Do you cover Wealdstone, Kenton and Rayners Lane?
Yes. We cover all of Harrow, including Wealdstone, Kenton, Rayners Lane, North and South Harrow, Harrow Weald and Headstone.
Need a gas engineer in Harrow?One call gets it sorted.
Gas Safe registered 961481 · 20 years' experience · £10m insured · 24/7 emergency heating service.