Extension Budget Planner
A rough, honest estimate in under a minute — including the contingency most people forget.
- Build (25m² × £2,700)
- £67,500
- Kitchen
- £15,000
- Contingency (15%)
- £12,375
- Estimated build cost
- £94,875
+ our design fee
We don't charge a percentage of the build — it's a fixed fee, agreed with you up front. Book a free call and we'll confirm the exact figure for your project, no guessing.
A rough guide to build cost only. Costs vary by home, ground conditions and region — your design fee is quoted separately and is always fixed.
Not sure whether to build, wait or move?
That's exactly what the call is for. We'll be straight with you — no pressure, no jargon, no nasty surprises.