Heated extensions in Welling, Blackfen and Bexleyheath
Where a heated extension on an inter-war semi gets awkward is the join with the house. The old ground floor might be suspended timber or a thin concrete slab, and the new one has to finish at exactly that height while still holding insulation, a membrane, heating pipes and screed.
So the layers are worked out top down, from the height the new floor must end at. Insulation is laid first, a membrane over it, then the pipes clipped in place and finally the screed. Over the pipes, a pumped screed needs a 25mm minimum, roughly 45mm to 50mm in all, while sand and cement is laid about 45mm deep above them. In both cases the pipes need surrounding completely, as an air pocket slows the heat getting out.
That is why a flowing screed is popular here: it runs round every pipe and settles flat. How it is pumped in is on our Bexley liquid screed page. Sand and cement still earns a place when the extension has a wet room, or when the heating covers one small area only.
None of it works if the edge strip and insulation are wrong, because the screed will crack along the walls. We can supply and fit the full build-up through our insulation fitting service and check the pipe fixings when we arrive to pour.
New riverside homes and Bexley heat-up schedules
In the Belvedere and Erith growth areas, new flats and houses are specified with liquid screed over heating pipes. The rules are the same as in an extension; the floors are simply bigger.
The heating switch is where things go wrong. New screed has to be warmed slowly, beginning at a low setting and climbing in steps over several days. Gentle heat can usually go into an anhydrite floor from about day 7, which helps it dry out; a cement screed has to be left for 21 days or longer. You get the schedule from us in writing for the heating engineer, so ask for it before the commissioning visit goes in the diary.
After that, the surface must suit its finish. Tiles, vinyl planks and timber boards over warm pipes each need a level floor, and the guide to screed thickness explains the depths that sit behind a sound heated floor.
Over heating pipes, a pumped liquid screed costs £20 to £35 per m² by 2026 UK pricing, whether it is one heated extension or a floor of flats in Erith. For the neighbouring borough to the south, see heated floor screed in Bromley.
Underfloor Heating Screed prices in Bexley
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 Bexley
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 Bexley
As the crow flies, our yard in Slough is about 34.3 miles from Bexley, which lies to the east. Postcodes here include DA7, DA1, DA15 and DA5, and Greenwich (3.6 miles), Swanley (4.4 miles), Dartford (4.5 miles) and Swanscombe (6.2 miles) are close by.
More on underfloor heating screed, part of our screeding services.