Heat pumps and heated screeds at St Mary's Park
Air source heat pumps pair well with underfloor heating set in a screed. The screed is the part that spreads the heat, so how it is laid affects how well the whole system performs.
Three things matter. First, depth over the pipes: liquid needs 25mm or more, which normally makes 45 to 50mm overall, and sand and cement about 45mm. The second is full encapsulation. Screed that flows wraps each pipe with no trapped air, and that is why a liquid floor warms up faster and heats more efficiently. The third is what lies beneath: insulation, a taped membrane and an edge strip round the walls so the slab can move. We check or supply all of these through our insulation and membranes service.
Homes built between 2000 and 2014 are 18% of Great Dunmow's stock, with more added since. A rear extension on a house of that age can take its own heated floor, laid to the same depth and level as the rooms it joins.
On a new plot, the drawings set the insulation, pipe layout and depth. We pour to the specification and record what was laid, with the date of the pour, so the heat-up can start at the right time. Where it names a calcium sulphate grade, our anhydrite screed grades page explains the options.
Retrofitting heat in older Great Dunmow homes
Adding underfloor heating to an older house near the High Street or North Street is mostly a question of height. Those floors often have to be broken out anyway, because they were laid without a modern membrane, and the depth of the dig sets how much insulation, pipe and screed will fit under the existing thresholds. Liquid screed's thinner section often makes the difference.
The sums are the same, only smaller, for a heated extension or a garden room in Great Dunmow. The insulation has to be deep enough to push heat upwards, the pipes need their full cover, and the finished floor must still meet the door or patio threshold.
Once the floor is down, the heat-up must be gradual. An anhydrite screed is usually ready for gentle warmth at about day 7. Give sand and cement three weeks at minimum, 21 days, before any warmth. Then, over several days, the installer nudges the flow temperature higher in small increments, holds it, and brings it back down ahead of the flooring. Switching straight to full risks cracking. Our screed drying times guide explains why.
For the same service in Braintree, see underfloor heating screed in Braintree.
Underfloor Heating Screed prices in Great Dunmow
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 Great Dunmow
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 Great Dunmow
On the map, Great Dunmow sits east-north-east of Slough, about 49.3 miles from our base in a straight line (postcodes including CM6), next to Braintree (8.1 miles), Bishop's Stortford (8.7 miles), Sawbridgeworth (10 miles) and Chelmsford (10.4 miles).
More on underfloor heating screed, part of our screeding services.
