Heated extensions in Winchester's suburban semis
Building out at the back to make a kitchen and family room is a familiar way to get more space from a suburban semi, and underfloor heating often goes in at the same time so the walls are free of radiators. In Stanmore, Weeke, Badger Farm or Oliver's Battery the screed has the same three tasks: hold the pipes, spread their heat and give the finish a flat base.
For these floors we normally pour liquid. As it flows it closes round each pipe without trapping air, and once there is a minimum 25mm over them the floor totals about 45 to 50mm. That shallow build-up makes it easier to line the new floor up with the old house so nobody trips over a step. The way the pump gets to the room is covered on our Winchester liquid screed page.
Sand and cement can also go over heating, at about 45mm above the pipes, and makes sense in smaller rooms or under finishes that want a cement base. The heating then has to stay off for longer.
Underneath, the layers must be correct. Insulation keeps heat from escaping into the ground, the membrane stops a flowing screed running into the gaps between insulation boards, and a perimeter strip lets the floor expand as it warms up. We go through all of it before pouring and flag anything that is missing.
Houses from 1973 to 1999, 24% of the city's homes, follow the same route when a kitchen is opened up.
Commissioning a new Winchester heated floor
A well laid heated floor can still be ruined by its first warm-up. Calcium sulphate can usually be warmed gently from around day 7. Sand and cement needs 21 days, minimum. After that the flow temperature climbs in small steps across several days and is then held, in line with the heating maker's and screed maker's schedules. Push it too quickly and the screed can crack or lift at the edges.
That warm-up does help dry the floor, but you still need a moisture test before flooring. Our guide to screed drying times explains why depth and material change the wait so much.
Older houses are trickier. Dig out a period floor to fit heating and there is usually very little height for insulation, pipes and screed, which is where the slimmer liquid screed helps. On a short programme, fast drying sand and cement can bring the flooring date closer. Ask your heating engineer early on which screed their system was designed around. The same applies if you are planning a heated floor in Romsey.
Underfloor Heating Screed prices in Winchester
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 Winchester
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 Winchester
Winchester is about 43.5 miles south-west of our Slough base as the crow flies, with postcodes including SO23 and SO22. The nearest towns to it are Eastleigh (6.6 miles), Romsey (9.6 miles), Hedge End (10.2 miles) and Southampton (11.6 miles).
More on underfloor heating screed, part of our screeding services.
