Central Heating Installation London
Full central heating installations, boiler upgrades, radiator additions, and smart controls across London. Gas Safe registered engineers, fixed prices quoted before we start, Building Regulations compliance included.
Which Central Heating System Is Right for Your London Home?
The right system depends on your property size, hot water demand, available space, and energy goals. Below are the three main options for London properties.
Combi Boiler System
Best for: 1–3 bed London properties, flats, Victorian terraces
Pros
- No hot water cylinder — saves space
- Instant hot water on demand
- Lower installation cost
- Efficient: only heats water when needed
Cons
- Reduced flow rate if multiple outlets run simultaneously
- No backup immersion heater
From £2,000 inc. boiler
System Boiler + Unvented Cylinder
Best for: 4+ bed London homes, multiple bathrooms, high hot water demand
Pros
- High hot water flow rate to multiple outlets
- Mains pressure hot water (no pump needed)
- Separate cylinder = immersion backup
- Better for solar thermal upgrade later
Cons
- Cylinder requires space (airing cupboard, plant room)
- Higher installation cost
- G3 qualified engineer required for unvented work
From £3,500 inc. boiler + cylinder
Heat Pump Central Heating
Best for: Homes with high insulation, off-gas or eco-conscious upgrades
Pros
- Eligible for £7,500 Boiler Upgrade Scheme grant
- Up to 300–400% efficiency (COP 3–4)
- Lower carbon footprint
- No gas supply required
Cons
- Higher upfront cost after grant
- Best with underfloor heating or oversized radiators
- Planning permission sometimes needed for outdoor unit in London
- Lower flow temperature than gas boiler
From £8,000 (gross) · £500–£2,500 after BUS grant
London-Specific Considerations
| Property type | Key consideration |
|---|---|
| Victorian / Edwardian terraces (pre-1914) | High ceilings, solid walls, poor original insulation. Radiators need to be larger to compensate for heat loss. Floor voids allow pipe runs without surface clipping in many cases. |
| Purpose-built flats (1960s–80s) | Communal heating systems may need bypassing. Check lease for rules on individual boiler installation. Flue positioning can be constrained in flat blocks. |
| Listed buildings | Flue positions and radiator types may be restricted. Surface-clipped pipework may not be permitted in certain rooms. We work with conservation officers on listed building projects. |
| Conservation areas | External flue outlets and heat pump units require planning permission and must meet specific appearance criteria in London conservation areas (approx. 20% of London). |
| Ground floor flats | No floor void access typically — pipework must be surface-clipped or run under floor screed (new installs). Consider skirting board heating as a low-profile alternative. |
Central Heating Installation Prices — London 2026
| Job | Typical duration | Price (supply + fit) |
|---|---|---|
| Single radiator addition to existing system | 2–4 hrs | £180–£350 inc. parts |
| Radiator upgrade (size or type, existing pipework) | 2–3 hrs | £150–£250 inc. radiator |
| Combi boiler only — like-for-like replacement | 1 day | £2,000–£3,500 inc. boiler |
| System boiler + unvented cylinder | 1–2 days | £3,500–£5,500 inc. components |
| Full central heating — 2-bed flat (no existing system) | 3–4 days | £4,500–£6,500 |
| Full central heating — 3-bed terrace (no existing system) | 4–5 days | £5,500–£8,000 |
| Full central heating — 4-bed semi/detached | 5–7 days | £7,000–£11,000 |
| Underfloor heating — single room (wet system) | 2–3 days | £800–£1,800 |
| Smart thermostat + TRVs (Nest / Hive / Tado) | 2–4 hrs | £250–£450 inc. hardware |
| Magnetic filter installation (Fernox / Adey) | 30–45 min | £85–£120 inc. filter |
All prices include Building Regulations notification and Gas Safety Record. Magnetic filter and inhibitor treatment recommended on all new systems (quoted separately). Fixed price confirmed after site survey.
Central Heating Installations Across London
Gas Safe engineers across all 33 London boroughs. Survey bookings 7 days a week.
Central Heating Installation FAQs
How much does central heating installation cost in London?
A full central heating installation in a 3-bedroom London property typically costs £5,500–£8,000 including a combi boiler, 8–10 radiators, pipe runs, and controls. A single radiator addition to an existing system costs £180–£350. Combi boiler only (where system exists) costs £2,000–£3,500. We survey and quote fixed price before starting.
How long does central heating installation take?
A full central heating installation in a standard London 3-bed terrace takes 4–5 days. This includes boiler installation, radiator fitting, pipe runs (through floor voids or surface-clipped), controls wiring, pressure testing, and commissioning. Adding a single radiator to an existing system takes 2–4 hours.
Can I get central heating if I have no gas supply?
Yes. Options include an air source heat pump (eligible for the £7,500 BUS grant), an oil boiler, or electric storage heaters. In London, most streets have gas mains so new gas connections are usually possible — National Grid will quote for a connection. We advise on the most cost-effective option for your property.
What size boiler do I need for my London property?
A 24–28kW combi suits most London 2–3 bedroom properties. A 4+ bedroom property with multiple bathrooms typically needs a 30–35kW combi or a system boiler with cylinder. Victorian terraces with high ceilings often need slightly higher outputs to compensate for heat loss. We size the boiler during our survey.
Do I need Building Regulations approval for central heating?
Yes — a new boiler installation requires a Building Regulations notification. As a Gas Safe registered company, we self-certify under Part L and Part J via the Competent Person Scheme. You receive a Building Regulations Compliance Certificate within 30 days. We handle all notifications.
Should I choose a combi or system boiler for my London home?
For most London 1–3 bedroom properties a combi is right — it heats water on demand, requires no cylinder, and saves significant space. For 4+ bedroom properties with en-suites, a system boiler with unvented cylinder delivers better simultaneous hot water flow. We advise during our survey — there's no one-size-fits-all answer.
Related Services
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Gas Safe registered · Fixed price after survey · All 33 boroughs
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