Extensions
Liquid Screed Cost for a Home Extension
An extension pour has to do two things a new build doesn't: match an existing floor level, and often work around people still living in the house.
Get your extension floor priced
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Extensions are one of the most common jobs we quote, and they come with a couple of considerations that don't apply to a clean new build slab. The new floor almost always needs to finish at a specific level to match an existing floor covering next door, and access usually runs through a house that's still lived in.
Neither of these makes the job dramatically more expensive, but they do shape the quote in specific ways worth knowing before you compare prices.
Here's what's genuinely different about pricing and planning an extension pour.
What's specific to extension pricing
- Finish level usually has to match an adjoining room, which sets the exact pour depth precisely
- Access typically runs through occupied living space, needing protection and careful timing
- Size is often at or near the small-job threshold — see our minimum charge page
- Junction detailing where the new floor meets the existing structure needs a movement joint
Typical extension size bands
| Extension size | Notes |
|---|---|
| Single-storey rear extension (20–40m²) | Common size, sits near the small-job pricing threshold |
| Wraparound extension (40–70m²) | Better per-m² value; often includes a kitchen-diner UFH zone |
| Double-storey extension with new upper floor | Priced per floor; upper level access adds complexity |
Get your extension floor priced
Send your extension's floor plan and the finish you're matching to, and we'll quote a level-matched pour.
Matching existing floor levels
Getting the finished screed level to sit flush with an adjoining room's floor covering is one of the most precise parts of an extension job — we set laser datum pins to the exact target level before pouring, accounting for whatever floor finish (tile, engineered wood, LVT) is going down on top.
Get this wrong and you end up with a step at the threshold, so it's worth confirming the final floor build-up — tile thickness, adhesive bed, underlay — before the datum is set, not after.
Extension Screed Cost — questions we get asked
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Get your extension floor priced
Send your extension's floor plan and the finish you're matching to, and we'll quote a level-matched pour.