Central Heating Installation Cost UK 2026

Installing central heating for the first time in a property that has never had it is a substantial project. Unlike a boiler replacement, it involves installing the boiler, radiators, pipework throughout the property, controls, and all associated fittings. Here are typical cost ranges by property size in 2026:

Property Size	Number of Radiators	Typical Total Cost
1–2 bedroom flat	4 – 6	£3,500 – £5,500
2–3 bedroom terraced / semi-detached	7 – 10	£4,500 – £7,000
3–4 bedroom detached house	10 – 14	£6,000 – £9,000
Larger or complex properties	15+	£8,000 – £15,000+

These figures assume a standard combi boiler installation with conventional radiators and thermostatic radiator valves (TRVs). They include all materials and labour. Properties with unusual layouts, solid walls, or listed building restrictions can cost significantly more.

All gas central heating installation work must be carried out by a Gas Safe registered engineer. Verify any engineer at gassaferegister.co.uk.

The ranges above are broad because several factors significantly affect what you'll pay:

• Number of radiators — Each radiator requires pipework runs, connections, a radiator, and a TRV. The cost per radiator (supply and fit, including pipework) is typically £200 to £400 depending on difficulty of access and distance from the boiler.
• Property size and layout — Larger properties need longer pipe runs. Properties with solid stone or brick walls (rather than cavity walls or stud walls) require more invasive work to route pipework, adding both time and cost.
• Type of boiler chosen — A combi boiler (the most common choice for new installations in smaller homes) costs less in total than a system boiler with a hot water cylinder, which is better for larger homes with high hot water demand. See our new boiler installation cost guide for detailed boiler type comparisons.
• Property access and floor type — Running pipework under suspended timber floors is relatively straightforward. Solid concrete floors require pipework to be surface-mounted (which can look less tidy), chased into the walls, or run in an underfloor screed (expensive). Surface mounting is the cheapest option but less aesthetically pleasing.
• Location — Labour rates in London and the South East are 20–40% higher than in the Midlands or North of England. The same project could cost £5,500 in Manchester and £7,500 in London.
• Underfloor heating — If you want underfloor heating in addition to or instead of radiators, the cost increases significantly — typically adding £1,500 to £4,000+ depending on the number of rooms and whether you are installing wet UFH (pipes in the floor, connected to the boiler) or electric UFH (simpler but more expensive to run).

A comprehensive central heating installation quote should include all of the following. If any item is missing, ask for clarification before accepting the quote:

• Boiler — Make, model, and output (kW). The boiler should be correctly sized for your property — not undersized (won't heat adequately) or oversized (inefficient, higher upfront cost).
• Hot water cylinder — If a system boiler rather than combi is chosen, the quote should include a suitably sized cylinder.
• Radiators and TRVs — Number and size of radiators should be specified (sized to heat each room based on its dimensions and heat loss calculation). Each radiator should include a thermostatic radiator valve (TRV) for individual room control.
• All pipework and fittings — The full pipework run throughout the property, including pipe clips, joints, and penetration sealing.
• System controls — Room thermostat, programmer/timer, and ideally a smart thermostat. The specific controls should be named in the quote.
• Magnetic system filter — Strongly recommended and required by many boiler manufacturers to maintain warranty. A Magnaclean or equivalent should be included.
• Flue — The boiler flue (the pipe that vents combustion gases outside). The quote should specify whether this is a standard horizontal through-wall flue or requires a longer or vertical run.
• Gas Safe certification — Building Regulations notification and a gas installation certificate must be included. Do not accept an installation without these.
• Commissioning and demonstration — The system must be properly commissioned (balanced, tested, set up) and you should receive a demonstration of the controls and thermostat.
• Making good — The quote should specify what reinstatement of decoration, flooring, and wall surfaces is included after pipework installation.

There is an important distinction between installing central heating where there is none, and upgrading or replacing an existing system:

First-time installation — The most expensive scenario. There is no existing infrastructure to build on — all pipework, radiators, a boiler, and controls need to be installed from scratch. This is a multi-day project (typically 3 to 7 working days for a standard house) involving considerable disruption, as pipework needs to be routed throughout the property. Expect some decoration damage that will need making good.

Replacing an existing heating system — Significantly cheaper and quicker if the radiators and most pipework are being retained. The main cost is a new boiler (£1,500 to £3,500 installed), plus any radiator upgrades or pipework repairs. This can often be completed in one to two days.

Extending an existing system — Adding radiators to rooms not currently served by central heating is a mid-point option — cheaper than a full installation but more complex than a simple boiler replacement. Cost depends on the number of radiators being added and the difficulty of running new pipework to them.

For properties that currently rely on storage heaters or electric panel heaters (common in flats built without gas connections), installing gas central heating also requires a gas supply connection if one doesn't already exist. Connecting a property to the gas network is a job for the gas distribution network operator (e.g., Cadent, SGN, Northern Gas Networks) and costs separately — typically £500 to £2,000 depending on distance from the gas main.

A first-time central heating installation in a typical 3-bedroom semi-detached house takes approximately 4 to 7 working days with an experienced team of two gas engineers and plumbers. Larger properties, complex pipework routes, or additional work (underfloor heating, system flushing, significant making good) extend the timeline.

Day-by-day, a typical installation sequence looks like this:

• Day 1 — Survey measurements confirmed, materials delivered, pipework routing started (under floors, through walls)
• Days 2–3 — Pipework runs completed, radiator positions fitted, boiler location prepared
• Days 3–4 — Boiler installed, flue fitted, system connected and filled
• Day 4–5 — System commissioned, balanced, tested, and certified; controls installed and demonstrated

Throughout the installation you will be without heating and potentially without hot water. Plan accordingly, particularly if the installation is in winter — a temporary electric heater for bedrooms is a sensible precaution.

Before committing to a gas central heating installation, it is worth considering alternatives — particularly heat pumps, which the UK government is actively incentivising as part of its net zero targets.

Air source heat pumps (ASHPs) extract heat from the outside air and use it to heat your home. They do not require a gas connection and produce no direct carbon emissions. The key trade-offs compared to gas central heating are:

• Higher installation cost — An ASHP system (heat pump unit, hot water cylinder, updated radiators or underfloor heating) typically costs £10,000 to £18,000 installed — considerably more than a gas system. However, the government's Boiler Upgrade Scheme (BUS) offers a grant of £7,500 towards the cost of an air source heat pump, significantly reducing the net cost. Check eligibility and apply at gov.uk/apply-boiler-upgrade-scheme.
• Lower running costs (potentially) — Heat pumps are 3–4 times more energy-efficient than gas boilers. Whether this translates to lower bills depends on the relative cost of electricity vs gas at the time. With current UK energy pricing, heat pump running costs are broadly comparable to a highly efficient gas boiler.
• Radiator sizing — Heat pumps operate at lower flow temperatures than gas boilers. This means existing small radiators may need upgrading to larger ones to deliver adequate heat. This adds cost to a retrofit installation but is less of a concern for new builds or full installations.
• Planning considerations — Most domestic ASHP installations are permitted development and do not require planning permission, but there are size, noise, and position restrictions. Listed buildings and conservation areas may require formal planning permission.

If you are installing heating from scratch in a property and plan to stay for many years, a heat pump is worth seriously evaluating alongside gas central heating — particularly with the BUS grant available.