Heated extension floors across Walton-on-Thames semis
Semi-detached houses are 26% of homes in Walton-on-Thames, and many of the town's semis date from the inter-war and post-war years. On a Rydens or Ashley Park semi, a warm-floored kitchen extension at the back is just the kind of plan this page is about. The floor build-up is insulation, membrane, edge strip, pipes and screed, and the top of that stack has to meet the existing kitchen floor.
The choice of screed changes the depth. Liquid screed must clear the pipes by 25mm, giving roughly 45 to 50mm in all, and it fills round each one so no air is trapped. Sand and cement calls for about 45mm over them, giving a thicker, heavier floor. In an extension where every millimetre of height counts, that difference matters.
Heat output follows the screed too. A thinner, denser liquid screed warms up faster and passes heat more evenly, which suits open plan spaces where the heating is the main source. A hand-laid screed is still a sound choice for a smaller heated room or where a cement base is wanted.
Fitting the pipes falls to your heating engineer. Before we pour, though, the insulation, edge strip and membrane get checked by us, and we can provide whatever is missing. For a large open space, see pumped liquid screed over the pipes. The 2026 UK figures for heated liquid floors start at £20 per m² and top out at £35.
Garage conversions and tight floors in Walton-on-Thames
A garage conversion with underfloor heating is one of the trickier floors. The slab is low, the room needs insulating, and the finished floor must match the house. Usually there is enough height to fit insulation, pipes and a liquid screed, but it needs measuring before the heating engineer lays anything.
Retrofit in an older room is tighter still. Some 27% of the town's homes were built between 1945 and 1972, and laying heating over an existing slab in a house of that age can raise the floor past door thresholds. Digging out and rebuilding is sometimes the only clean way to fit it in.
Do not reach for the thermostat straight after the pour. Calcium sulphate will normally take gentle warmth once about 7 days have gone by. Sand and cement needs 21 days or longer. The first heat-up follows the commissioning schedule, starting low and rising slowly over several days.
There is more on waiting periods in how long a new screed takes to dry. For the same work about two miles away, see the Weybridge underfloor heating screed page.
Underfloor Heating Screed prices in Walton-on-Thames
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 Walton-on-Thames
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 Walton-on-Thames
As the crow flies, our yard in Slough is about 14.1 miles from Walton-on-Thames, which lies to the south-east. Postcodes here include KT12, TW17 and KT10, and Weybridge (2 miles), Sunbury-on-Thames (2.3 miles), Addlestone (3.4 miles) and Chertsey (3.7 miles) are close by.
More on underfloor heating screed, part of our screeding services.