Heated extensions on Dartford's inter-war and post-war semis
Heating is easiest to add in an extension, as the depth can be planned before anything is built. The slab goes down, then insulation, then the pipes, then the screed. The finished floor must line up with the existing house, and in Dartford's semis that means meeting a slab that may be decades old.
The key figure is how much screed sits over the pipes. With liquid, that is 25mm at least, making 45 to 50mm overall in most cases, and the screed flows round every pipe without leaving voids. Sand and cement asks for about 45mm on top, so the layers stack up higher. Where the extension floor has to match a low existing floor, the thinner liquid build-up can save the height needed for insulation.
Of Dartford's homes, 31% are semis. Retrofitting heating into an existing room in one of them is harder than in an extension, because door thresholds and skirting set the finished level. Often the only way is to break out the old floor and rebuild it with the heating in the new build-up.
The insulation, edge strip and membrane are checked before the pour, and we can supply any of them. For depth guidance across different build-ups, read our screed thickness guide, and for smoothing the old slab side of the join, see floor levelling in Dartford.
Commissioning heated floors in Dartford apartments and houses
In apartment schemes such as Langley Square and Brewery Square, underfloor heating under liquid screed, with an acoustic layer, is a typical build-up. The screed there does two jobs: it spreads the heat and it protects the pipes and acoustic layer below. Liquid screed for Dartford flats covers how the pour reaches upper floors.
Whatever the building, the heating must be commissioned gently. Gentle heat can normally go into a calcium sulphate screed from about day 7. For sand and cement the wait is 21 days or longer. The first heat-up should rise in small steps over several days. Our heat-up guidance comes in writing, and your heating engineer and the person fitting the flooring should both work to it.
For 2026, a heated floor in liquid screed is published at £20 to £35 per m², and area, depth and access settle where yours lands. The warm-up also helps dry the floor before tiles or wood, but a moisture test should still confirm it is ready. For more on that, read how long screed takes to dry. Close by, see underfloor heating screed in Swanscombe.
Underfloor Heating Screed prices in Dartford
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 Dartford
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 Dartford
As the crow flies, our yard in Slough is about 38.8 miles from Dartford, which lies to the east. Postcodes here include DA2, DA1 and DA9, and Swanscombe (1.6 miles), Grays (3.8 miles), Northfleet (4.5 miles) and Bexley (4.5 miles) are close by.
More on underfloor heating screed, part of our screeding services.
