Heated extensions on Hatfield's old aerodrome land
Homes built since 2000 make up 29% of Hatfield's housing. When a newer house gains a heated extension, the job is one new room joined to a floor that stays as it is. The screed also decides how much the new floor rises, which matters where the extension opens straight into an existing kitchen or living room.
The screed has three tasks over the pipes. It must cover them fully so no air pockets slow the heat. It must be deep enough over them not to crack. It also has to line up with the floor in the next room. With liquid, a minimum of 25mm above the pipes brings the finished build to about 45 to 50mm. Hand-laid sand and cement takes roughly 45mm over the pipes, so it builds up deeper.
In an extension the slab level is set during the build, so either can work. Liquid is quicker to lay, flows round the pipes and warms up faster. Hand-laid sand and cement is the pick for a wet room, or for any floor where the finish calls for a cement base. The choice usually comes down to the finish and the programme.
Before we pour, we check the insulation, the membrane and the perimeter edge strip, and supply any part of that build-up that is in our price. For grades and aftercare if calcium sulphate is chosen, see anhydrite flow screed in Hatfield.
Commissioning heating under a Hatfield screed
After the pour, the heating stays off for a while. With calcium sulphate, gentle warming can normally start around day 7; with sand and cement, nothing goes on for at least 21 days. Then commissioning is gradual: a low temperature first, raised a little each day until it reaches normal running. Switching straight to full heat dries the screed unevenly and risks cracking under the finish.
You and your heating engineer both get the schedule in writing, so everyone follows one plan.
Retrofits are the harder case. Semis make up 24% of Hatfield homes, and fitting heating into an existing ground floor means lifting the old finish and fitting insulation, pipes and screed into a limited depth. Liquid screed's thinner cover usually makes it the one that fits.
Where a newer floor has hairline cracks rather than real failure, a smoothing compound may be all it needs before flooring, and our floor levelling page covers that. The screed drying guide explains drying times, and about 5 miles away we also pour underfloor heating screed in St Albans.
Underfloor Heating Screed prices in Hatfield
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 Hatfield
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 Hatfield
As the crow flies, our yard in Slough is about 24.4 miles from Hatfield, which lies to the north-east. Postcodes here include AL10, AL9 and AL4, and Welwyn Garden City (2.7 miles), Potters Bar (5 miles), St Albans (5.2 miles) and Hertford (6.5 miles) are close by.
More on underfloor heating screed, part of our screeding services.
