Underfloor Heating in Your Extension

Your builder will quote you £800–£1,500 for screed. The actual liquid screed bill will be £2,000–£3,000. That gap is the single most common cost surprise in the entire first-fix phase, and it catches almost every homeowner who hasn't been warned.

Wet underfloor heating is the right choice for a kitchen extension. It's more efficient than radiators, invisible once installed, and gives you even heat across an open-plan space with no cold spots near bifold doors. But the installation itself is a coordination exercise involving your plumber, your builder, and a specialist screed company, all working to a tight sequence where one delay cascades into weeks of lost time.

This guide covers the full process: what goes into the floor, who does what, when screed gets poured, and the specific hold points where you need to check the work before it disappears under 50mm of liquid concrete.