A new boiler is a ten-to-fifteen-year decision installed in a day — and the difference between a compliant, commissioned installation and a quick swap shows up in your gas bills, your warranty and your paperwork. Verified Gas Safe engineers in H&F do it properly, and every one is checked before listing, including registration directly with the Gas Safe Register.

✅ Checked before listing — identity, insurance, trading presence, Gas Safe (where relevant). How we verify →
✅ Workmanship guarantee badges on listings — 1, 3, 6 or 12 months

⚠️ Smell gas, or suspect a leak? Don’t use the boiler or any switches — leave, then call the National Gas Emergency Service free, 24 hours, on 0800 111 999 from outside. Full safety guidance ↓

Contact verified Gas Safe engineers in Hammersmith & Fulham ↓

Coverage: W6, W12, SW6 and W14 — Hammersmith, Fulham, Shepherd’s Bush, White City, West Kensington, Barons Court and across the borough.
What this covers: new and replacement gas boiler installations — combi, system and conventional — including controls, flueing, commissioning and the Building Regulations paperwork. Still weighing up whether to replace at all? Start with Boiler Repair and our repair-or-replace guide; once it’s in, Boiler Servicing keeps the warranty alive.
Costs: priced as a job — boiler, controls, flue, labour and commissioning; a straight swap costs less than a relocation or system change.
Availability: listed engineers set their own hours; lead times stretch in autumn.

Jump to: Combi, system or conventional? · Boiler Plus — what the law requires · Paperwork & commissioning done right · Safety first · Flues and flats · Find an engineer by district · What it costs · FAQs

Combi, system or conventional — which fits your home?

The right boiler type follows the building and how it uses hot water, not the brochure.

A combi heats water on demand with no cylinder or tanks — space-efficient and well suited to many of H&F’s one- and two-bedroom flats, where the airing cupboard went years ago. Its limit is simultaneous demand: two showers at once is where combis disappoint.

A system boiler works with a hot-water cylinder — better for larger households and homes with more than one bathroom, at the cost of the cylinder’s space.

A conventional (heat-only) boiler with tanks suits some older, larger properties and like-for-like replacements where re-engineering the whole system isn’t justified.

The honest sizing conversation covers bathrooms, occupants, mains flow and pressure, and the existing system — not just kilowatts. Our combi vs system boiler guide walks the choice through in detail. One H&F note: some newer riverside blocks run communal heat or heat interface units rather than individual boilers — if that’s your building, a “new boiler” may not be the right question, and the managing agent is the first call.

Boiler Plus — what the law requires of a new boiler

Since April 2018, new domestic gas boiler installations in England must meet the Boiler Plus standard. Per the government’s Boiler Plus factsheet, that means a minimum efficiency of 92% ErP, with timers and room thermostats an explicit requirement for gas and oil systems — and when a gas combi is installed, one additional energy-saving measure must be fitted, chosen from flue gas heat recovery, weather compensation, load compensation, or smart controls providing automation combined with optimisation.¹

Which of the four suits you is a genuine choice, not a formality — the requirement is deliberately flexible to fit different homes — so a good installer discusses it before quoting rather than silently bolting on the cheapest. A quote for a new combi that doesn’t mention any of the four is a quote that hasn’t engaged with the regulations.

Paperwork and commissioning — the part that protects you

A compliant installation produces paper, and the paper matters.

Building Regulations. A new boiler is notifiable building work: per the industry’s Benchmark scheme, installations in England and Wales must be notified to Local Authority Building Control, either directly or through the installer’s Competent Persons Scheme, after which a Building Regulations Compliance Certificate is issued to you.² Keep that certificate — solicitors ask for it when you sell.

Commissioning and the Benchmark checklist. The installer should complete the Benchmark commissioning checklist in the boiler’s documentation — flow rates, gas rate, combustion readings — and the system itself should be cleaned, flushed and treated in line with BS 7593: a chemical clean and flush before fresh inhibitor goes in, and an in-line filter fitted to protect the new boiler; in hard water above 200ppm, BS 7593 also recommends a scale reducer.² That last point is live here: H&F sits in Thames Water’s hard-water region, so connecting a new boiler to a dirty or scale-prone system is how ten-year boilers die in five.³

Warranty. Register it, diarise the annual service it requires, and keep the Benchmark record — a long warranty is a maintenance contract in disguise, and Boiler Servicing covers keeping it valid.

Safety first

Installation is gas work from start to finish — which is why the legal line matters most on this page: only an engineer on the Gas Safe Register may install a gas boiler, and you can check any engineer there yourself, free.⁴

If you smell gas, or suspect a leak — during or after any work: follow the gas emergency steps —

1. Open doors and windows to ventilate.
2. Turn off the gas at the meter’s emergency control valve, if you can do so safely.
3. Put out naked flames and don’t smoke.
4. Don’t operate electrical switches — on or off.
5. Leave the property.
6. Call the National Gas Emergency Service, free and 24 hours, on 0800 111 999 from outside.⁵

Carbon monoxide. A poorly-running gas appliance can produce carbon monoxide (CO), which you can’t see or smell. A new installation is the natural moment to fit an audible CO alarm — the HSE advises one complying with BS EN 50291, sited in line with the manufacturer’s instructions.⁶ If a CO alarm ever sounds, get fresh air and call 0800 111 999.

Flues, flats and where the boiler can actually go

In H&F’s flats and conversions, the flue often decides the installation. A flue terminal has to sit clear of openings, boundaries and walkways to manufacturer and Building Regulations requirements — and on an upper floor or an internal kitchen, the compliant routes can be few. Where a flue runs concealed through ceilings or voids, inspection hatches are needed so the whole run can be examined, now and at every future service. Moving a boiler across the flat sounds simple and rarely is: the flue route, the condensate route (which needs a drain or a properly-installed pumped alternative, frost-protected if external) and the gas-supply sizing all travel with it. A good installer surveys all three before quoting; a price given over the phone hasn’t.

Leaseholders: a flue terminal position or a boiler relocation can touch the lease and the freeholder’s consent, particularly on external walls — worth checking before the install date, not after.

Find a verified Gas Safe engineer by district

The installation follows the building — its flue options, its space and its system.

Hammersmith, Ravenscourt Park & Fulham Reach (W6) — conversions and period flats where the compliant flue route and a kitchen-cupboard boiler position need a proper survey, and concealed runs need inspection hatches.

Shepherd’s Bush, White City, Wood Lane & Wormholt (W12) — terraces, mansion blocks and estate flats including the White City Estate, where council homes follow the council’s installation programmes and private installs turn on flue position and access.

Fulham, Fulham Broadway, Parsons Green, Walham Green & Munster (SW6) — mansion blocks and converted Victorian houses where an old system being connected to a new boiler makes the BS 7593 clean, flush, inhibitor and filter genuinely non-negotiable.

Sands End, Imperial Wharf & the riverside (SW6) — newer riverside apartments where some blocks run communal heat or heat interface units; check what your building has before pricing a boiler that may not be the answer.

West Kensington, Barons Court, Avonmore & North End (W14) — older flats and conversions plus the West Kensington and Gibbs Green estates; W14 is shared with Kensington & Chelsea, so check your engineer covers your side.

Brook Green & Addison — period flats and mansion blocks where conservation-sensitive elevations can constrain flue terminal positions and reward early planning.

If you’re unsure which label fits your address, the postcode search above will match you to engineers covering it.

What a new boiler costs

Installation is priced as a whole job — boiler, controls, flue, labour, commissioning and treatment. As a rough orientation only:

Editorial estimate only — these are general guide figures, NOT regulated rates, NOT market data and NOT a published cost survey. Always get a written, itemised quote. Hammersmith & Fulham is inside London’s Ultra Low Emission Zone, so a non-compliant van may carry the £12.50 daily ULEZ charge.⁷ The borough is outside the central London Congestion Charge zone, so that charge doesn’t normally apply to local callouts.⁸ When comparing quotes, check each one itemises the Boiler Plus measure, the system clean and inhibitor, the filter, and the Building Regulations notification — our how to read a plumbing quote guide shows what a complete quote looks like.

Frequently asked questions

Why verified plumbers — not a general directory

A boiler installation is the biggest single plumbing purchase most households make, performed by someone you’ve usually never met, with most of the workmanship sealed behind the case and the wall. Verification is how you stack the odds.

Every listing is checked before it goes live and re-verified annually. For gas work, we confirm Gas Safe registration directly with the Gas Safe Register — and you can check any engineer there yourself, free, in under a minute. We also confirm the business is legitimately trading, verify the named contact, check for evidence of public liability insurance, and confirm coverage of H&F’s W6, W12, SW6 and W14 postcodes before a profile is approved. For water-side work you can also use WaterSafe, the free, water-industry-backed national register.

Profiles may be suspended or removed if credentials lapse or credible concerns are raised — see the full verification process →. No customer middleman fee: enquiries go directly to the engineer.

Related areas

Verified Gas Safe engineers across Hammersmith & Fulham’s neighbourhoods, including:

• Addison
• Askew
• Avonmore
• Barons Court
• Brook Green
• Fulham
• Fulham Broadway
• Fulham Reach
• Hammersmith
• Hurlingham
• Imperial Wharf
• Munster
• North End
• Palace Riverside
• Parsons Green
• Ravenscourt Park
• Sands End
• Shepherd’s Bush
• Walham Green
• Wendell Park
• West Kensington
• White City
• Wormholt

Related services

Other verified plumbing services in Hammersmith & Fulham:

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

Related guides

• Combi vs System Boiler — UK Guide
• Boiler Repair or Replace?
• How to Read a Plumbing Quote
• London Hard Water — Homeowner & Landlord Guide

A new boiler done properly is a compliant appliance, a clean treated system, and a folder of paperwork that protects you for a decade. Start with a verified Gas Safe engineer whose registration is already checked.

Contact verified Gas Safe engineers in Hammersmith & Fulham ↑

← Back to all plumbing services in Hammersmith & Fulham → /london/hammersmith-and-fulham/

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 sources cited on it (the Government’s Boiler Plus standard, the HHIC Benchmark scheme, the Gas Safe Register, the Health and Safety Executive, the National Gas Emergency Service, Thames Water, WaterSafe and Transport for London). Source links are provided within this page where relevant.

Sources & further reading

1. BEIS — Boiler Plus: new standards for domestic boiler installations (92% ErP; time and temperature controls; combi additional measure): https://assets.publishing.service.gov.uk/media/5b2cc1e2ed915d586e2d8fe9/Boiler_Plus_Factsheet_v3.pdf
2. HHIC — Benchmark Commissioning & Warranty Validation Service (LABC/Competent Persons notification; Building Regulations Compliance Certificate; BS 7593 system treatment): https://www.hhic.org.uk/uploads/5D9B41557255E.pdf
3. Thames Water — Hard water (hard-water region and limescale): https://www.thameswater.co.uk/help/water-and-waste-help/water-quality/hard-water
4. Gas Safe Register — the official register of businesses legally permitted to work on gas: https://www.gassaferegister.co.uk/
5. National Gas — Emergency contacts (0800 111 999, free, 24 hours): https://www.nationalgas.com/emergency-contacts
6. HSE — Domestic gas health and safety FAQs (carbon monoxide; BS EN 50291 alarms): https://www.hse.gov.uk/gas/domestic/faqs.htm
7. Transport for London — ULEZ where and when: https://tfl.gov.uk/modes/driving/ultra-low-emission-zone/ulez-where-and-when
8. Transport for London — Congestion Charge zone: https://tfl.gov.uk/modes/driving/congestion-charge/congestion-charge-zone
9. WaterSafe — free, water-industry-backed national register of approved plumbers: https://www.watersafe.org.uk/