Coverage: all Brent postcodes — HA0, HA9, NW10, NW2, NW6 and NW9, plus the HA1, HA3 and HA9 edges shared with Harrow and Barnet.
What this covers: supplying and installing new and replacement gas boilers — combi, system and regular — including type and size selection, flue and condensate routing, a system flush and filter, commissioning, and the Building Regulations notification and certificate.
Not sure which you need? A faulty existing boiler is Boiler Repair; the annual service and landlord certificate is Boiler Servicing; radiators or the wider system is Central Heating Repair.
Costs: a fixed price per install, depending on boiler, location and system — see What it costs.
Availability: cover varies by engineer — check each listing.

Jump to: Choosing & installing · Safety first · In Brent homes · By district · Costs · FAQs · Why verified

Choosing and installing a boiler — what’s involved

The first decision is the type. A combi heats water on demand and needs no cylinder, which suits smaller homes and flats; a system boiler works with a hot-water cylinder and suits homes with higher hot-water demand or more than one bathroom; a regular (heat-only) boiler suits older systems with a feed tank and cylinder. Household size, hot-water demand, water pressure and the number of bathrooms all steer the choice, and the right size matters as much as the right type — an oversized boiler cycles wastefully. Combi vs System Boiler walks through it, and whether to replace at all is in Boiler Repair or Replace.

Before quoting, a good installer surveys the job rather than guessing: checking the mains flow rate, the size of the existing gas pipe, the flue and condensate routes, the existing controls, and whether the radiators and system are clean enough for a new boiler. That survey is what tells them which boiler actually fits — converting an old heat-only or system setup to a combi, for instance, can also mean removing the tanks and cylinder, confirming the mains flow is strong enough, and upgrading older gas pipework to feed a modern boiler.

A new boiler has to meet current efficiency rules. In England, since 2018, the Boiler Plus standards require a new domestic gas boiler to be at least 92% ErP efficient and fitted with time and temperature controls; a new combi must also include one of four energy-saving measures — flue gas heat recovery, weather compensation, load compensation, or a smart control with automation and optimisation functions.¹

The install itself covers siting the boiler, routing the flue and the condensate pipe — which needs a proper fall to a drain or soakaway, and protection from freezing where it runs externally — sizing the gas supply, and connecting the system, plus flushing the existing system and fitting a filter on any replacement so old debris doesn’t damage the new boiler. If the work includes an unvented hot-water cylinder, that’s separately notifiable and needs an engineer qualified for it (a G3 ticket). A boiler is a “heat-producing appliance,” so the installation is notifiable under the Building Regulations: a Gas Safe registered installer self-certifies and notifies the local authority within 30 days, and you receive a Building Regulations Compliance Certificate confirming it was fitted correctly and safely — keep it, as you’ll need it to sell or remortgage.² All of this must be done by a Gas Safe registered engineer; as the Health and Safety Executive sets out, gas appliances should only be installed by a registered engineer, and unregistered gas work is illegal.³

Safety first

A boiler burns gas, so a poor install isn’t just inefficient — it can be dangerous. A correctly fitted boiler is commissioned to the manufacturer’s Benchmark checklist, gas-tightness tested, and its flue and condensate routed and terminated correctly; cutting corners on any of that can lead to a gas leak or to carbon monoxide (CO), a gas you can’t see, smell or taste that can be fatal. Don’t accept an install that hasn’t been commissioned and notified.

Warning signs of a CO problem on any gas appliance include a lazy yellow or orange flame instead of a crisp blue one, soot or black staining around the appliance, the pilot frequently going out, and more condensation than usual. Symptoms of CO poisoning include headaches, dizziness, nausea, breathlessness, tiredness, collapse and loss of consciousness — they can mimic flu but without a fever, and a telling sign is that they often ease when you leave the house and return when you’re back indoors. The Gas Safe Register advises contacting NHS 111 if you suspect CO poisoning, and calling 999 for severe symptoms such as breathlessness, confusion or loss of consciousness.⁴ An audible CO alarm to the BS EN 50291 standard is a sensible backstop, but never a substitute for a correct install and annual servicing.

If you smell gas or suspect a leak or CO, follow the gas-emergency sequence:

1. Don’t touch electrical switches, light a flame, or smoke — and don’t search for the leak.
2. Open doors and windows to ventilate, if it’s safe to do so.
3. Turn off the gas at the meter control valve, if you can reach it safely.
4. Leave the property if the smell is strong or you feel unwell.
5. Call the National Gas Emergency Service on 0800 111 999 from outside or a neighbour’s.⁵

Brent homes: hard water, flats and replacing an old boiler

A few Brent specifics shape boiler installs here.

Hard water makes the system flush worth insisting on. Thames Water classes all the water in its region as hard,⁶ Affinity Water likewise classes its supply as hard,⁷ and Brent’s planning guidance confirms the borough is split between Affinity in the north and Thames in the south.⁸ A new boiler going onto an old system is exactly where a proper flush and a magnetic filter earn their place — they protect the new heat exchanger from the existing system’s debris (which builds up from corrosion as well as scale) and help keep the manufacturer’s warranty valid.

Flats shape the boiler and the flue. In Wembley, Wembley Park and the newer blocks, a combi in a fitted cupboard with a flue out through an external wall can be the practical choice — but in a Wembley Park or South Kilburn flat the boiler’s position may be limited by the existing flue route, cupboard access, and whether the managing agent allows work through an external wall or balcony. And some newer or estate flats are on communal heating rather than an individual boiler, in which case a “boiler replacement” is a building-management matter, not a domestic Gas Safe install.

Replacing an old boiler in the period stock. In the Victorian and Edwardian terraces around Kilburn, Willesden and Kensal, a replacement may mean swapping out an old back boiler or an inefficient heat-only system — and in a Kilburn or Willesden conversion, moving to a combi can also mean removing tanks and a cylinder, checking the mains flow is strong enough, and upgrading older gas pipework, with flue and condensate routing in an older house needing thought.

If you rent, a landlord must use a Gas Safe registered engineer and a compliant boiler, and they carry the annual gas safety duty — see Boiler Servicing. Brent council tenants should report heating problems to Brent Council / Brent Housing Management on 020 8937 2400.⁹

Find a verified boiler installer by district

Boiler installs vary across the borough.

Wembley, Wembley Park & Tokyngton (HA0, HA9) — Flats that can suit a combi in a fitted cupboard with an external-wall flue, where siting and access often run through a managing agent.

Alperton (HA0) — Newer apartments, often with modern combi or system boilers already in place for like-for-like replacement.

Willesden, Harlesden, Church End & Stonebridge (NW10, NW2) — Terraces and flats above shops with a mix of boiler ages, and plenty of older units due for replacement.

Kilburn, South Kilburn, Queen’s Park & Brondesbury (NW6, NW10) — Victorian terraces and conversions, where old back boilers and gravity-fed systems can be replaced and right-sized.

Kensal Green & Kensal Rise (NW10, NW6) — Period homes where inefficient older boilers are often swapped for high-efficiency combis or system boilers.

Cricklewood, Dollis Hill & Mapesbury (NW2) — Larger older houses near the Barnet and Camden boundary, which can suit a system boiler and cylinder.

Kingsbury, Queensbury, Kenton & Northwick Park (NW9, HA3) — Interwar suburban houses, where system or combi replacements and the occasional cylinder install come up.

Sudbury, Preston & North Wembley (HA0, HA9) — Suburban houses with system or combi installs and conversions from older heat-only setups.

Park Royal, Twyford & Brent Park (NW10 and edges) — Commercial premises, where commercial boiler and plant work needs the right Gas Safe commercial qualifications. See Commercial Plumbing in Brent.

(Neighbourhood links will be added in a later phase; areas are listed here for coverage.)

What it costs

A boiler install is a fixed price for the job, and the variables are the boiler chosen, the location, the flue run, and whether the system needs flushing or upgrading. The figures below are indicative ranges to sense-check a quote, not fixed prices — a compliant quote includes commissioning and the Building Regulations certificate.

Editorial estimate only — these are not regulated rates, not market data and not a published cost survey. Price depends heavily on the boiler make and model; always confirm commissioning, the system flush and the Building Regulations certificate are included before work starts.

Two Brent points on rates: the borough is inside London’s Ultra Low Emission Zone, which operates across all London boroughs every day except Christmas Day, so a non-compliant van may carry a daily ULEZ charge;¹⁰ but Brent sits outside the central London Congestion Charge zone, so that charge doesn’t apply to ordinary Brent callouts.¹¹ For help reading a quote, see How to Read a Plumbing Quote and the London Plumbing Costs & Compliance Guide.

Frequently asked questions

Why verified Gas Safe engineers — not a general directory

A boiler install is a major, gas-fired job you live with for ten to fifteen years, and getting the wrong person can mean a non-compliant, un-notified or unsafe installation. The value of a verified listing is an engineer whose registration and cover have been checked before they reach your door.

Every listing is checked before it goes live and re-verified annually: we confirm the business is legitimately trading and verify the named contact, we check evidence of public liability insurance, we look at the engineer’s track record across the web, and we confirm they cover Brent’s postcodes before a profile is approved. For gas work we confirm Gas Safe registration directly with the Gas Safe Register — and you can check it yourself: anyone carrying out gas work is legally required to be registered, and every engineer carries a Gas Safe ID card showing their licence number, photo and expiry date, with the gas work they’re qualified for listed on the back, which you can verify online.¹²

Ranking here isn’t for sale: profiles aren’t ordered by who pays, and there’s no per-enquiry middleman fee — your enquiry goes directly to the engineer. A single top slot may be a paid sponsored position, and where it is, it’s clearly labelled “Sponsored.” Profiles can be suspended or removed if credentials lapse or credible concerns are raised — see the full verification process →.

Related areas

Verified plumbers and Gas Safe engineers across Brent’s neighbourhoods, including:

• Alperton
• Brondesbury
• Church End
• Dollis Hill
• Dudden Hill
• Harlesden
• Kensal Rise
• Kingsbury
• Neasden
• North Wembley
• Preston
• Stonebridge
• Tokyngton
• Wembley
• Wembley Central
• Wembley Park
• Willesden
• Willesden Green

Related services

Other verified plumbing services in Brent:

• Emergency Plumber in Brent
• Burst Pipes in Brent
• Leak Detection in Brent
• Blocked Drains in Brent
• Toilet Repairs in Brent
• Tap Repair in Brent
• General Plumbing in Brent
• Bathroom Plumbing in Brent
• Kitchen Plumbing in Brent
• Washing Machine & Dishwasher Installation in Brent
• Boiler Repair in Brent
• Boiler Servicing in Brent
• Central Heating Repair in Brent
• Commercial Plumbing in Brent

Related guides

• Combi vs System Boiler
• Boiler Repair or Replace
• London Hard Water — Homeowner & Landlord Guide
• London Plumbing Costs & Compliance Guide 2026

A boiler install is one of the highest-stakes jobs in a home — it has to be the right unit, fitted to the efficiency rules, commissioned and certified, by someone the law allows to do it. Getting that right from the start is the whole point. This page exists so the engineer who does it has already been checked.

Contact verified Gas Safe boiler installers in Brent ↑

← Back to all plumbing services in Brent

Last reviewed: June 2026 by Adiel Khan — SFEDI-accredited business advisor, 20+ years’ experience (South East Enterprise Ltd) and operator of VerifiedPlumbers. LinkedIn ↗

This page is checked for compliance and regulatory accuracy against the bodies and regulations cited on it — the Boiler Plus standards (GOV.UK), the Gas Safe Register, the Building Regulations, the Health and Safety Executive, the National Gas Emergency Service, Thames Water, Affinity Water and Brent Council. Source links are provided within this page where relevant.

Sources & further reading

1. GOV.UK — Boiler Plus factsheet (new domestic gas boilers in England must be ≥92% ErP with time and temperature controls; a new combi must include one of four energy-saving measures, including a smart control with automation and optimisation functions): https://assets.publishing.service.gov.uk/media/5b2cc1e2ed915d586e2d8fe9/Boiler_Plus_Factsheet_v3.pdf
2. Gas Safe Register — Building Regulations certificate (a heat-producing appliance install must be notified to the local authority within 30 days; a Building Regulations Compliance Certificate is issued): https://www.gassaferegister.co.uk/gas-safety/gas-safety-certificates-records/building-regulations-certificate/
3. Health and Safety Executive — Gas safety (use a Gas Safe registered engineer to install gas appliances; unregistered gas work is illegal): https://www.hse.gov.uk/gas/employers.htm
4. Gas Safe Register — Carbon monoxide poisoning (CO symptoms; contact NHS 111 if suspected, 999 for severe symptoms): https://www.gassaferegister.co.uk/gas-safety/carbon-monoxide-poisoning/
5. National Gas — Emergency contacts (National Gas Emergency Service 0800 111 999): https://www.nationalgas.com/emergency-contacts
6. Thames Water — Hard water (all water in the region is classed as hard): https://www.thameswater.co.uk/help/water-and-waste-help/water-quality/hard-water
7. Affinity Water — Water hardness (Affinity classes its supply as hard): https://www.affinitywater.co.uk/hardness
8. London Borough of Brent — Sustainable Environment & Development SPD (clean-water supply split Affinity north / Thames south): https://haveyoursay.brent.gov.uk/…/230216_SustainableEnvironment+DevelopmentSPD.pdf
9. Brent Council — Repairs and maintenance (council-tenant repairs reported to Brent Council / Brent Housing Management on 020 8937 2400): https://www.brent.gov.uk/housing/tenant-services/repairs-and-maintenance
10. Transport for London — Ultra Low Emission Zone (operates across all London boroughs, every day except Christmas Day): https://tfl.gov.uk/modes/driving/ultra-low-emission-zone
11. Transport for London — Congestion Charge (central London zone; Brent is outside it): https://tfl.gov.uk/modes/driving/congestion-charge
12. Gas Safe Register — the Gas Safe ID card (anyone carrying out gas work is legally required to be registered; check the engineer’s ID card and verify it online): https://www.gassaferegister.co.uk/gas-safety/the-gas-safe-id-card/