A new boiler, properly sized, for a home you plan to keep
A free in-home survey, a fixed written quote, and Gas Safe registered installation across all 33 London boroughs.
Get a free survey
Tell us about the property — we'll arrange a free, no-obligation survey. No spam, no mailing lists.
Not sure what size boiler you need?
Enter your bedrooms, bathrooms and radiators for a directional kW estimate before the survey confirms it.
24-28kW
1-2 bedrooms
28-30kW
3 bedrooms
30-35kW
3-4 bedrooms
From the first enquiry to a commissioned boiler
No black box between “we got in touch” and “it's installed” — here's the actual sequence.
Free survey arranged
Tell us about the property and we arrange an in-home survey at a time that works for you — no charge either way.
Radiators, bathrooms, flue checked
An engineer assesses what actually determines boiler type and output, not a rule of thumb applied at the door.
Fixed quote, in writing
You get a written price covering the boiler, installation and old boiler removal — no obligation to proceed.
Gas Safe fit & commissioned
Your new boiler is installed, commissioned to the Benchmark checklist, and notified through the Gas Safe scheme.
Which boiler type suits your home
The free survey confirms it, but this is the same comparison our engineers start from on every job.
| Most requested in London Combi (combination) boiler | System boiler | Regular (heat-only / conventional) boiler | |
|---|---|---|---|
| Hot water | Heated on demand, no cylinder | Stored in a cylinder | Stored, gravity or tank fed |
| Space needed | Smallest — no tank or cylinder | A cylinder, no loft tank | Cylinder plus loft tank |
| Best suited to | Flats, one bathroom | 2+ bathrooms, simultaneous use | Larger or older properties |
| Mains pressure needed | Good incoming pressure required | Reasonable pressure required | Works with low mains pressure |
Every source we cross-checked agrees the final call needs an in-home survey, not a room count alone — that survey is free and comes with no obligation.
Full comparison guideSurvey it right. Commission it properly.
A free survey and a Benchmark-commissioned installation on every job, so nothing is guessed and nothing is skipped.
Free in-home survey
An engineer assesses radiators, bathrooms and pipework before anything is quoted — not a phone estimate.
Learn more
Correct sizing, not a guess
Radiator count and bathroom count decide the output — see our sizing helper for a starting estimate.
Learn more
Honest boiler type recommendation
Combi, system or regular — recommended on merit for your property, not by default.
Learn more
Gas Safe registered installation
Every job commissioned to the manufacturer's Benchmark checklist, with Building Regulations notified.
Learn moreWhy choose us
Built for a decision you only make once a decade
A free survey before anything is quoted, a fixed price in writing, and a straight answer on which boiler type actually suits your home.
Free survey, no obligation
An engineer sees the property before anything is recommended or quoted — there's no charge for this, and no pressure to proceed.
Fixed quote, in writing
The price you're quoted after the survey is the price you pay. No day-of surprises, no invented extras.
Fully Gas Safe registered
Every installation is carried out by a fully Gas Safe registered engineer — check any engineer's registration before work starts.
Boiler type recommended honestly
Combi, system or regular — we tell you what actually suits your bathrooms and hot water demand, not whichever is easiest to fit.
Fully Gas Safe registered
Engineers surveying homes across Greater London
A checklist that backs up every installation
We don't call a job done because the boiler switches on. The manufacturer's Benchmark checklist confirms it's correctly commissioned — and protects your warranty.
Get a free surveyGetting ready for the visit
Four things worth doing before your free survey — none of them require an engineer on site.
Book your free survey
Tell us the property type and roughly how many radiators and bathrooms — it helps us prepare.
Note any recurring faults
If your current boiler has needed repeat repairs, mention it — it helps the engineer assess your options.
Think about hot water demand
How many bathrooms need hot water at once matters more than bedroom count for sizing.
Check your Gas Safe engineer
Any installer working on your gas boiler should be Gas Safe registered — verify it before booking.
From survey to a boiler that's commissioned properly
Free Survey
An engineer visits to assess your current system, radiators, pipework and hot water demand — no charge, no obligation.
Fixed Quote
You receive a written, fixed quote covering the boiler, installation and old boiler removal before anything is booked.
Gas Safe Installation
A fully Gas Safe registered engineer fits your new boiler and commissions it to the manufacturer's Benchmark checklist.
How we get your boiler right
Free survey
Radiators, bathrooms, flue routing and pipework assessed before any number is quoted.
Correct sizing
Output sized to your property, not the boiler that's easiest to fit.
Try the sizing calculatorFixed quote
A written price agreed before work starts — the figure that ends up on the invoice.
Gas Safe commissioning
Benchmark checklist completed and Building Regulations notified through the Gas Safe scheme.
Everything We Do
Core services
Installation
Our London-Wide Installer Network
Gas Safe registered engineers positioned across the capital, so a free survey is available wherever you are in London.
Coverage across all 33 Greater London boroughs. Map data © Google.
Coverage
Free Surveys Across London
Our network of Gas Safe registered engineers covers every London borough, so a free survey is never far away.
Thinking about a new boiler? Start with a free survey.
Tell us about the property. We arrange a free survey and reply with a fixed quote in writing.
London Boiler Replacement — what you can expect
Free survey, no obligation
An engineer sees the property before anything is recommended or quoted — there's no charge, and no pressure to proceed.
Fixed quote, in writing
The price agreed after the survey is the price you pay — no day-of surprises, no invented extras.
Fully Gas Safe registered
Every installation is carried out by a fully Gas Safe registered engineer — check any engineer's registration before work starts.
Guides
What to Know Before You Replace a Boiler
Common questions
New Boiler Installation: Your Questions
How much does a new boiler installation cost in London?
It depends on boiler type, output and how much of your existing pipework needs updating, so we don't quote a figure without seeing the property. The free survey gives you a fixed, written price with no obligation to proceed.
Is the survey really free?
Yes — the in-home survey is free and comes with no obligation. You only pay if you accept the fixed quote that follows.
How do I know which boiler type I need?
It mainly depends on your number of bathrooms and hot water demand. See our combi vs. system vs. regular guide, or use the sizing helper for a starting estimate — the free survey confirms it.
Are your engineers Gas Safe registered?
Yes — every installation is carried out by a fully Gas Safe registered engineer, a legal requirement for any work on a gas boiler in the UK. You can check any engineer's registration on the Gas Safe Register.
What areas of London do you cover?
We provide free surveys and installations across all 33 London boroughs, covering Greater London.
How long does a new boiler installation take?
A like-for-like combi swap is often a single day. Converting between boiler types or upgrading pipework typically takes one to two days — your quote states the expected timescale.
What happens to my old boiler?
It's removed and disposed of responsibly by your Gas Safe registered engineer as part of the installation.
Do you offer a warranty on new boilers?
Manufacturer warranties apply to the boiler itself (typically 7-15 years depending on brand and installer accreditation — see our brand guide), and our installation is commissioned to the manufacturer's Benchmark checklist to keep that warranty valid.