How much does a new central heating system cost?
A full central heating system covers the boiler, radiators, valves and pipework. Get an indicative figure below, then build it into your schedule.
What a full system includes
- 1Boiler
A combi for most homes; a system boiler with a cylinder for larger properties and HMOs.
- 2Radiators and valves
Roughly one radiator per habitable room plus bathroom/hall, each with a TRV and lockshield.
- 3Pipework and flush
New distribution pipework, a power-flush and a magnetic filter.
On a back-to-brick refurbishment, a full heating system is usually installed alongside the rewire — the two first-fix trades that leave making-good for the plasterer. Budget for the plastering and decoration that follow.
Central heating costs (indicative, fitted)
| Scope | Property | Indicative cost |
|---|---|---|
| Boiler only (swap) | Any | £1,800 – £3,000 |
| Full system (small) | 1–2 bed | £3,000 – £5,000 |
| Full system (3-bed) | Terrace/semi | £3,500 – £6,500 |
| Full system (large/HMO) | 4+ bed | £6,000 – £10,000 |
Includes boiler, radiators, valves and pipework. Underfloor heating is separate.
Frequently asked questions
How much does a new central heating system cost?+
A full system for a typical 3-bed house costs around £3,500–£6,500 including the boiler, radiators, valves and pipework. Larger homes and HMOs cost more.
How many radiators do I need?+
As a rule of thumb, one radiator per habitable room plus the bathroom and hallway — so a 3-bed usually needs 6–8.
Related tools & guides
Want to know how these figures are calculated? See our cost methodology.
Cost figures shown are indicative estimates, not quotations. You are responsible for verifying all costs (obtain contractor quotes) and any figures submitted to a lender. ScopeWise is a documentation tool, not financial, tax, structural or planning advice. HMO compliance prompts are guidance only — confirm requirements with your local council, as standards and licensing vary by authority.