How Much Does a Boiler Installation Cost in London? (2026)
Real 2026 prices for combi, system and conventional boilers — installed, certified and warrantied
2026
A new boiler is one of the biggest single investments a homeowner makes. In 2026 a typical London installation lands between £1,800 and £3,800 depending on the boiler type, the brand and what's actually included. Here is exactly what those figures cover — and how to avoid paying for work you don't need.
Typical 2026 London Ranges
- Combi boiler, installed £1,800–£3,200
- System boiler, installed £2,200–£3,500
- Conventional (heat-only) boiler, installed £2,400–£3,800
These are working, certified prices for a like-for-like swap in a standard London property — boiler, flue, controls and labour included. Moving the boiler, upgrading pipework or converting between types adds to the job, so your quote should spell out every line item.
What's Included in the Price
- New flue and terminal, correctly sized and positioned
- Condensate drainage run to a suitable discharge point
- Removal and disposal of your old boiler
- System flush, inhibitor and magnetic filter
- Commissioning, handover and paperwork
Flue, condensate, removal and flush are the four items most often treated as "extras" by budget quotes. If a price looks too good to be true, ask which of these are missing before you compare like with like.
Brand Premium: Worcester/Vaillant vs Budget
Premium brands such as Worcester Bosch and Vaillant typically add £400–£800 over a budget model of the same type. You're paying for established service networks, longer parts availability and — when fitted by an accredited installer — 10-year warranties that budget brands rarely match.
That doesn't make budget boilers bad; many are perfectly reliable. But if you plan to stay in the property long term, the extra cost of a premium brand is usually repaid in peace of mind and resale value.
Gas Safe, 10-Year Warranties and Payment
Boiler installation is not DIY territory: by law the work must be carried out by a Gas Safe registered engineer, and the installation must be notified to the scheme. Accredited installers unlock the manufacturer's 10-year warranty — without the right paperwork, you can lose it.
We quote simple 10/60/30 payment terms: 10% on design, 60% before materials and 30% on completion — no retention. 0% point-of-sale finance is available, so you can spread the cost with nothing extra to pay over the term.
Compliance & Certification
All our boiler installations are carried out by Gas Safe registered engineers and comply with current Building Regulations:
We certify every installation, register it with Gas Safe and hand over your 10-year manufacturer warranty paperwork.
Get an Exact Boiler Quote
Tell us about your property and current boiler and we'll send a fixed, itemised quote — 10/60/30 payment, no retention, 0% finance available.
Request Free Quote