Underfloor Heating Installation Cost Calculator

How this calculator works

This calculator works in ranges rather than single figures, because real quotes, yields and tariffs genuinely vary that much. It starts from typical UK price, output and savings ranges drawn from published 2026 industry guides and official scheme documentation, then scales them by the quantities you enter and adjusts them for each choice you make below. The result is a low-to-high band that a realistic outcome is likely to fall within, not a promise of the figure you will achieve.

Underfloor heating costs roughly to per square metre installed for electric mats, to for wet systems laid into a new screed, and to for retrofit wet overlays in 2026, so a 20 square metre kitchen runs to depending on route. Wet systems then cost a third to a half as much to run as electric for the same heat, and pair outstandingly with heat pumps, whose low flow temperatures suit big warm floors better than any radiator.

Floor area (square metres)

Measure the room or zone being heated: a typical bathroom is 4 to 8 square metres, a kitchen 12 to 20, an open plan extension 25 to 40 and a whole ground floor 40 to 60. Per square metre prices fall somewhat on larger areas as the fixed costs of manifolds, thermostats and connections spread out.

System type

Electric mats are cheap and thin to install, ideal for bathrooms and single rooms, but cost the most to run since they use peak-rate electricity directly. Wet systems circulate warm water from the boiler or heat pump through pipes, cheap to run but dearer to fit: in a new floor or extension the pipe simply lays into the screed, while retrofitting to an existing floor uses low-profile overlay panels that add 15 to 25 mm of height, the most expensive installation route. The running cost difference is why wet systems win for large areas and daily use, and electric for small rooms used briefly.

New floor covering

Underfloor heating works under most coverings but suits conductive ones best: tile, stone and luxury vinyl transmit heat readily, engineered wood works with care, and thick carpet blunts the output. Since the old covering usually comes up to fit the system, many projects include new flooring, for which this adds a broad allowance of to per square metre fitted; skip it if the flooring is priced elsewhere.

Where you live

Heating labour is not priced uniformly across the UK, with published guides putting London and South East installation quotes roughly 15 to 25 percent above the national average. The hardware costs the same everywhere, so the difference sits in engineer day rates, access and parking.

What else affects the figures

The floor build-up decides feasibility as much as budget: screeded systems need 65 to 100 mm of depth and weeks of drying time, overlays need 15 to 25 mm and doors trimming, and electric mats need almost nothing, which is why bathrooms default to mats. Insulation beneath the heating is not optional, since an uninsulated floor sends a share of your expensive heat downwards, and Building Regulations apply insulation standards whenever the floor structure is replaced. Controls matter more than with radiators because floors respond slowly, so each zone needs its own programmable thermostat run with steady setbacks rather than on-off blasts. Wired correctly by a qualified electrician for mats, and designed with proper manifold balancing for wet systems, underfloor heating is the rare upgrade that improves both bills and comfort; skimped on design, it is a slow lukewarm disappointment, so specialist installers earn their margin.

Certification, planning and grid connection

Underfloor heating touches several sets of rules depending on route: wet systems connected to a gas boiler involve Gas Safe work at the boiler end, electric mat systems need Part P qualified electrical connection, and any project that replaces the floor structure triggers Building Regulations insulation standards for the new floor. Screeded systems need their drying time respected before floor coverings go down, and floor height changes interact with doors, stairs and thresholds in ways worth planning rather than discovering. In bathrooms, electrical zones govern what can be installed where, one more reason mat systems belong with qualified installers.