Cost of Central Heating Installation in the UK (2025)
A full central heating system installation costs £3,500–£7,000. Adding a single radiator to an existing system costs £150–£400. Power flushes run £300–£600.
Full system installation
Installing central heating in a property that has none involves fitting a new boiler, laying pipework throughout the house, fitting radiators in each room, and installing controls. This is major work typically taking 3–7 days depending on property size.
Power flushing
Over time, heating systems accumulate sludge that blocks radiators and reduces efficiency. A power flush forces clean water through the system at high pressure to remove this buildup. Signs you may need one include cold spots on radiators, noisy pipes, or a slow-heating system.
Cost Breakdown
All prices are indicative UK averages for 2025. Actual costs vary by location, specification, and contractor. London and South East rates are typically 20–35% higher.
| Item | Low | High |
|---|---|---|
| Add single radiator | £150 | £400 |
| Power flush | £300 | £600 |
| Full system (2-bed property) | £3,500 | £5,500 |
| Full system (4-bed property) | £5,000 | £8,000 |
| Thermostatic radiator valves (full set) | £200 | £500 |
| Smart thermostat installation | £100 | £250 |
What Affects the Cost?
- ✓Size of property and number of radiators
- ✓Whether new pipework needs to be run or existing can be used
- ✓Boiler type and specification
- ✓Whether smart controls are included
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Post a Job — It's FreeFrequently Asked Questions
Do I need a Gas Safe registered engineer for central heating?
Yes — any work involving gas must be carried out by a Gas Safe registered engineer. This includes boiler installation and connection. Radiator fitting and pipework can be done by a plumber, but gas connections must be made by a Gas Safe engineer.
How long does central heating installation take?
A full installation in a 3-bed house typically takes 3–5 days. Larger properties or those requiring new floorboard lifting take longer.