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St John’s Wood mixes grand Victorian villas with modern flats near Regent’s Park, and BeFix fits boilers in all of them, starting at £1,500 (+VAT). Every job is carried out by our Gas Safe registered engineers (No. 967796), as part of our wider Boiler Installation in London service. A written, itemised quote follows a free survey before anything is booked, and finance is available if you’d rather spread the cost.
All-in-one and compact, the usual fit for St John’s Wood flats and conversions.
The table above covers typical pricing by boiler type, but your final figure depends on a handful of factors we confirm during a free, no-obligation survey, not a call-centre estimate. The £1,500 starting point applies across all three types for straightforward like-for-like swaps, where the existing pipework, and for System boilers the cylinder, can be reused. A full central heating installation that includes a new unvented cylinder or significant pipework tends to land closer to the top of its range.
A boiler swap in a ground-floor conversion and a full system replacement in a five-bedroom Hamilton Terrace villa cost different amounts, so we don’t put one number on every job before anyone has set foot in your home. What we commit to is a transparent, itemised quote from a Gas Safe engineer who has assessed your boiler, your pipework and your property in person, with nothing added afterwards.


St John’s Wood’s residential character took shape from 1794, when the Eyre Estate’s master plan introduced some of England’s earliest semi-detached villas, a model later carried along streets such as Cavendish Avenue, while neighbouring land developed by the Harrow School Estate gave rise to the grand houses of Hamilton Terrace. Many of these Victorian and Georgian properties now sit within a conservation area or carry listed status, alongside newer apartment blocks close to Regent’s Park.
That mix matters for boiler installation. A five- or six-bedroom villa with several bathrooms usually needs a higher-output system boiler and an unvented cylinder to cope with simultaneous demand, while a one- or two-bedroom apartment near Regent’s Park is often better suited to a compact combi. In listed or conservation-area properties, the flue position and pipework route also need extra care for the historic fabric, and that’s not just good practice, it’s often a legal requirement.
In practice, that means our engineers plan flue positions and pipework routes to avoid unnecessary drilling into original brickwork or joinery, and we’ll flag if listed building consent is likely to be needed before any external work begins.
| Property type | Installation consideration |
|---|---|
| Victorian or Georgian villa (e.g. Hamilton Terrace, Cavendish Avenue) | Higher-output system boiler, unvented cylinder, careful flue routing to protect the façade |
| Listed or conservation-area property | Discreet flue placement, minimal disturbance to historic fabric, consent check where needed |
| Modern apartment near Regent's Park | Compact, space-saving combi with a same-day swap in many cases |
An engineer visits to check access, existing pipework and the best position for the new boiler.
A clear price breakdown before any work is booked in — no vague "from" figure.
Most straightforward swaps take around 8 hours and are completed within a single working day; more complex jobs may need longer.
All work carried out under registration number 967796.
Every new boiler is commissioned, tested and registered — a gas safety certificate is available if you need one.
12 months' workmanship cover from BeFix, plus up to 12 years' manufacturer warranty depending on the model.
We fit all major UK boiler brands, including Worcester Bosch, Vaillant, Ideal, Keston, Remeha, Baxi, Main and Viessmann. BeFix is an Accredited Installer for Worcester Bosch, Baxi, Vaillant and Ideal, which typically extends the manufacturer warranty on new installations of these brands.

Number 967796, verifiable on the official Gas Safe Register at any time.
for the duration of every job.
per engineer, including older, awkward-access properties common in St John's Wood.
Every BeFix engineer working in St John’s Wood is Gas Safe registered under registration number 967796. You can check this yourself on the Gas Safe Register before booking. We also carry public liability insurance, and our engineers each bring more than ten years’ hands-on experience with UK boiler systems, including the older pipework and flue arrangements common in this area’s period properties. Every new installation includes the Gas Safe certificate for your records.




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Kate HendersonTrustindex verifies that the original source of the review is Google.
I’d had various concerns about my aircon system at my flat in NW2 not working effectively, and was very relieved when Befix were able to offer a prompt service appointment. Communication in advance of the appointment was good and engineer Vahid arrived punctually and worked carefully and thoroughly, ensuring the whole system was in good working order. He was clearly knowledgeable about all kinds of technical issues, friendly and adaptable, and I had confidence that he was attending to everything properly. I am not perhaps very familiar or up to date with what I should expect to pay for this kind of work. I think the price was probably fair - but I would advise checking in advance to make sure you are happy with the arrangement. I was left feeling relieved my system was now in good working order, and will certainly consider the company again for future work, including more ambitious projects.Posted on Google![]()
Beryl RamsayTrustindex verifies that the original source of the review is Google.
Excellent job, very thorough and pleased with the end result.Posted on Google![]()
Kornwipha SutthiphonphongTrustindex verifies that the original source of the review is Google.
Great job on fixing the boiler. Fast and efficient quick call out for Slone square area 👏Posted on Google![]()
Asim Cengiz AkbulutTrustindex verifies that the original source of the review is Google.
Needed certified gas safety experience in Finchley Central, N3. Came out on emergency call and did a great job. V happy, will call againPosted on Google![]()
oja cTrustindex verifies that the original source of the review is Google.
Vahid was kind, professional, and incredibly good at his job. He came quickly and flexibly to west london/ Kensington area— and worked out the most economic and quickest way to help with a boiler that lost its pressure. Could not recommend this service more!Posted on Google![]()
Sev ZachariaTrustindex verifies that the original source of the review is Google.
Brilliant service very fast Aircon unit installed.Very reasonably pricedPosted on Google![]()
NICHOLAS PEARSONTrustindex verifies that the original source of the review is Google.
Excellent in every respect. If you need a top plumber in South East London then BeFix come highly recommended. A tricky job which had not been solved by previous professional, was immediately diagnosed by BeFix which has saved me money and time. Efficient, punctual, and reasonably priced.Posted on Google![]()
Anthony PisarskiTrustindex verifies that the original source of the review is Google.
Amazing quality of work. Was lucky enough to have a same day appointment. Provided great advice, arrived on time and completed the work exactly as promised. Very reasonably priced (having received a quote for over 2x) Would absolutely recommend every time. Very friendly and professional! Thank you so muchPosted on Google![]()
Samin MoghimiAslTrustindex verifies that the original source of the review is Google.
Vahid was very fast to respond to my quote request and to set a time for his visit. He fixed our boiler in a very efficient and professional manner. He already had the replacement part with him beforehand which was very helpful. I would 100% recommend BeFix!Posted on Google![]()
TaysirTrustindex verifies that the original source of the review is Google.
Took some trial and error and a few visits, but in the end it was done. He visited on short notice which was very helpful.
Most installations in St John's Wood cost between £1,500 and £3,750, depending on boiler type, your property and how much of the existing pipework can be reused. We confirm your exact price with a written quote after a free survey.
A straightforward like-for-like swap usually takes around 8 hours, or one working day. More involved jobs, such as relocating the boiler or converting from a regular to a combi system, can take longer, and we'll give you a realistic timeframe before booking.
Yes. Many St John's Wood properties are listed or sit in a conservation area, and our engineers plan flue routes and pipework to minimise disturbance to historic fabric. We'll flag if listed building consent is likely to be needed before any external work starts.
Yes. BeFix's Gas Safe registration number is 967796, which you can verify directly on the Gas Safe Register. We're also fully covered by public liability insurance.
Yes, boiler finance is available so you can spread the cost of your new installation over an agreed term rather than paying the full amount upfront.
Every installation includes a 12-month workmanship warranty from BeFix, on top of up to 12 years' manufacturer warranty depending on the boiler model.
Not always. Replacing a boiler in its existing position rarely needs consent, but relocating it or changing the external flue position can. We check this during your free survey and let you know before any work is booked in.
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