A realistic breakdown of installed costs by system type and project situation.
Underfloor heating costs in Devon and Cornwall vary depending on the type of system, your floor construction, and whether you're doing a new build or a renovation. Below are realistic installed prices (materials + labour) based on current 2026 market rates in the South West.
| System Type | Typical Cost per m² | Best For |
|---|---|---|
| Traditional Screed System | £85 – £115 | New builds and major renovations |
| Overlay XPS System | £95 – £125 | Renovations on solid floors |
| Low-Profile Gypsum Overlay | £105 – £135 | Renovations where floor height is limited |
| Between Joist System | £100 – £140 | Period properties with timber floors |
| Structural Board System | £115 – £155 | Renovations where floor structure needs replacing |
*Prices include materials and labour. Costs can vary depending on access, insulation requirements, and floor finishes.
Usually the most cost-effective time to install underfloor heating.
Costs are generally higher due to additional labour and preparation.
Solid concrete floors are generally cheaper to work with than suspended timber floors. Between joist systems on timber floors usually cost more per square metre.
This is one of the most misunderstood areas.
On solid concrete floors, many modern overlay systems can be fitted directly on top of uninsulated slabs. Downward heat loss is often only around 6–10%, so full insulation isn’t always essential.
However, on suspended timber floors (especially ground floors), insulating between the joists is very important. Without it, a significant amount of heat can be lost downward into the void below.
Difficult access, removing old flooring, or working around existing services increases labour costs.
Tiles and engineered wood work very well with underfloor heating. Thick carpets and some vinyls can reduce performance and may require additional preparation.
Use our Underfloor Heating Calculator to get a personalised estimate based on your floor type and situation.