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
- Design fee (fixed, ~10%)
- £6,750
- Contingency (15%)
- £13,388
- Estimated total
- £102,638
A rough guide only. Build costs vary by home, ground conditions and region. Our design fee is always fixed and agreed before any work starts.
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.