Heated extensions matched to New Milton slab levels
Put a rear or side extension on a 1950s to 1990s detached house in New Milton and one thing cannot move: the concrete slab in the original house. The heated extension floor has to finish level with it, so insulation, pipes and screed must all fit into a depth fixed before any of them arrive.
Start from the pipe crowns and work up. A pumped screed needs 25mm above them as a minimum, normally adding up to 45 to 50mm of screed. Trowelled cement screed wants nearer 45mm of cover, so that build-up ends taller. When the old slab caps the height of the extension floor, the slimmer liquid choice makes space for more insulation, and that insulation decides whether warmth goes up into the room or down into the ground.
Complete encapsulation is the second argument for a flowing screed. It closes around each pipe with no voids, so the floor heats evenly and responds well to the thermostat. Hand-laid screed can equal it if packed carefully along every run.
When a ground floor is opened up, the heating often carries on from the extension into the old room. If that means lifting the original floor, look at the base first: the cracked and hollow screeds common in houses this age are better replaced than buried. Relaying is covered on our New Milton sand and cement page, and the pumped pour on our liquid screed page.
Commissioning heated floors in New Milton homes
With the screed down, the heating sits idle for a while. A week (7 days) is normally enough before a calcium sulphate floor is warmed; cement screed needs three weeks, 21 days, as a minimum. Commissioning is gradual: begin with a low flow temperature and turn it up in steps over several days. We give you the schedule on paper and your heating engineer follows it.
Going straight to full heat is among the most frequent reasons heated screeds crack and debond. Handled gently, those same pipes are what gets an anhydrite floor ready for flooring soonest.
A converted garage starts out cold, and a heated screed over good insulation is a sensible way to make it a usable room. The same build-up rules apply, and the floor still finishes level with the house.
Pumping screed over heating loops is published for 2026 at between £20 and £35 per square metre. How long the floor then takes to dry is explained in screed drying times, and we offer the same service five miles away in Lymington.
Underfloor Heating Screed prices in New Milton
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 New Milton
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 New Milton
On the map, New Milton sits south-west of Slough, about 69.5 miles from our base in a straight line (postcodes including BH25), next to Lymington (5 miles), Christchurch (5.6 miles), Ringwood (8.8 miles) and Bournemouth (10 miles).
More on underfloor heating screed, part of our screeding services.
