Stage 4 — Build
How much will yourbuild cost?
Enter your house width and how far you want to extend. Get an area-specific estimate with permitted development guidance and the hidden costs nobody tells you about.
Fixed prices, no surprises
Local team in Poole
No lock-in, ever
Fast turnaround
Based in Poole since 2017
m
m
6m × 4m = 24m²
For permitted development guidance
Estimated cost
£57385 – £76360
Excluding VAT. VAT estimate: £11477 – £15272
Build cost (24m²)£48000 – £62400
Hidden costs£1900 – £4000
Contingency (15%)£7485 – £9960
Total (ex VAT)£57385 – £76360
Important note
These are estimates, not quotes.
Every project is different. These figures are based on typical costs in the Dorset area and should be used as a starting point, not a final budget. For a realistic cost breakdown tailored to your specific property, start with the Project Starter Pack — an on-site visit with 3D point cloud scan and draft floor plans.
See the Project Starter Pack →