Heated extensions on Witney estates like Madley Park
Homes built between 1973 and 1999 make up 35% of Witney's housing, the largest single group by age. A heated kitchen or garden room added at the back of a late 20th century semi is a typical extension, and the screed laid over its pipes decides how well that room warms.
In that kind of extension the pipes are clipped over insulation, and the screed has to surround every pipe without air pockets. With a liquid screed the cover must be at least 25mm, which usually makes 45 to 50mm in total. Hand-laid sand and cement wants roughly 45mm on top of them. Go thinner and cracks can open over the pipe lines. Go much thicker and the room takes longer to heat.
A pumped liquid screed flows under and around the pipes and dries flat, which suits tile, LVT and engineered wood. A hand-laid mix still has a place where the extension includes a wet area or falls.
Then there is the level at the doorway, where the new floor joins the house. On an older semi the existing floor may sit at a level that leaves little room for insulation, pipes and screed, so the build-up is planned backwards from the finished floor height at the doorway. Before the pour we either inspect the insulation boards, membrane and perimeter strip or provide them, and the pipework should have been pressure tested already.
Commissioning a heated Witney floor step by step
A freshly laid floor is not ready for heat. Calcium sulphate can normally start a slow warm-up after about 7 days. With sand and cement, leave the system off for 21 days at the least. In both cases the flow temperature goes up a little at a time across several days, letting the floor dry evenly rather than crack. You get a clear heat-up schedule from us, and the heating engineer works from the same one.
Retrofit into older houses is the harder case. Cottages around Wood Green and the West End tend to need damp proofing and insulation before any new floor, and that applies twice over to a heated one, since heat lost downward into damp ground is wasted. Breaking out the old floor and rebuilding it is usually the only way to fit the full build-up without a step at every doorway.
For drying and testing before flooring, read how long screed takes to dry. What goes beneath the screed is covered under floor insulation and damp membranes. Heated floor screeds in Oxford are also available.
Underfloor Heating Screed prices in Witney
Liquid screed over underfloor heating: £20 to £35 per m² supplied and laid (trade2base, June 2026), so £700 to £1,230 for 35 m². trade2base gives these figures excluding VAT. See our floor screeding cost guide or screed calculator.
Who lays your underfloor heating screed in Witney
K & B Screeding’s own team, led by director Donatas Bardisevicius. Founded 2019, company 12298780.
See what customers say in our Google reviews and on our testimonials page.
Underfloor Heating Screed from Slough to Witney
Witney is about 40.2 miles west-north-west of our Slough base as the crow flies, with postcodes including OX28 and OX29. The nearest towns to it are Carterton (5.1 miles), Kidlington (8.8 miles), Oxford (10 miles) and Abingdon-on-Thames (11.9 miles).
More on underfloor heating screed, part of our screeding services.
