Heated extensions on post-war Tidworth semis
An extension makes underfloor heating straightforward, as the depth can be allowed for on the drawings before anything is built. On a post-war semi or terrace in Tidworth, the new slab is set low enough that insulation, pipes and screed finish level with the existing kitchen or hallway.
The depth over the pipes is the part that cannot be skimped. With liquid screed, cover should be at least 25mm, giving 45 to 50mm in total. Sand and cement wants roughly 45mm on top of the pipes. Because liquid screed surrounds each pipe completely and leaves no air gaps, the room warms faster and the system runs more efficiently. Sand and cement still works where a cement floor is needed, such as a utility area that may get wet.
Fitting pipes is not something we do. Your heating engineer puts them in, tests them under pressure and leaves them pressurised for the whole pour. Our checks before pouring cover the edge strip, membrane and insulation, and anything not right we can supply.
Retrofitting into an existing room is harder. The old floor may have to be dug out to make room for the new layers, or the screed kept as thin as the system allows. In an occupied house, doing one room at a time keeps the rest of the home in use while each new floor dries. Minimum depths are listed in our guide to how thick screed should be.
Repairs and new finishes on Tidworth's heated floors
Many of Tidworth's newer houses already have a screed over underfloor heating, and over time those floors may need levelling or small repairs. A cracked patch, a section cut out to reach a pipe, or a change from carpet to LVT can all mean work on the screed.
A small repair has to match the existing build-up and avoid the pipes. The new section is cut back carefully, filled and finished level with the surrounding floor. Our screed repairs service covers those jobs.
A heated floor that is solid but too uneven for its new finish just needs a thin coat of levelling compound, and levelling a Tidworth floor shows how that works. The heating should be off, and the floor cool, before compound goes down.
After any new pour, commissioning is gradual. With calcium sulphate, the heating can normally go on from about 7 days. Give sand and cement 21 days as a minimum. The temperature is then raised in steps following the system supplier's schedule. Running it hot too soon risks cracking a new heated floor, so it pays to keep the schedule somewhere the whole household can see it.
Underfloor Heating Screed prices in Tidworth
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 Tidworth
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 Tidworth
As the crow flies, our yard in Slough is about 48.4 miles from Tidworth, which lies to the west-south-west. Postcodes here include SP9 and SP11, and Amesbury (7 miles), Andover (8.4 miles), Salisbury (13.1 miles) and Devizes (16.2 miles) are close by.
More on underfloor heating screed, part of our screeding services.
