Garage conversions
Liquid Screed Cost for a Garage Conversion
A garage conversion almost always means building on top of an existing slab that was never designed as a habitable-room floor. That's the whole pricing conversation.
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Garages are typically built with a slab that slopes slightly to a drainage point and sits without insulation beneath it — fine for parking a car, not ideal for a living room or home office. Converting one into habitable space usually means retrofitting insulation on top of that existing slab, which sets the whole depth and cost conversation for the new screed floor.
Because the existing slab is fixed, the finished floor level is often constrained by the door threshold to the house — there's frequently very little headroom to add insulation plus screed before you run into the door frame or ceiling height.
Here's what actually drives the cost and design decisions on a garage conversion floor.
What we check before quoting a garage conversion
- Existing slab condition, level and any fall that needs correcting
- Available depth up to the door threshold and any structural constraints
- Whether UFH is wanted, which needs enough build-up depth to fit
- Damp-proofing — garage slabs don't always have a DPM to the same standard as a house floor
Low-depth options vs full standard build-up
Low-depth build-up
- Thin, high-performance insulation board
- Shallow-cover liquid screed where headroom is tight
- Compromise on U-value if depth is very limited
Standard build-up
- Full-depth insulation to current U-value guidance
- Room for a UFH-specific screed mix
- Needs more headroom below the threshold
Get your garage conversion measured
Send us the slab dimensions and door threshold height and we'll advise on realistic build-up options and cost.
Why the threshold usually decides the depth
In most garage conversions, the limiting factor isn't cost — it's the available height between the top of the existing slab and the door threshold into the house. That gap has to fit insulation, any DPM, and the screed itself.
We'll measure this precisely at survey and talk you through the realistic build-up options before pricing anything, since the depth decision drives both the insulation spec and the screed cost.
Garage Conversion Cost — questions we get asked
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Get your garage conversion measured
Send us the slab dimensions and door threshold height and we'll advise on realistic build-up options and cost.