Two-storey extension guide price tool
Four quick steps: type, size and postcode, specification, then where to send it. See your guide price update as you go.
Your guide price
Including VAT at 20%. Excludes design and approval fees, kitchens, bathroom fittings and flooring. A guide, not a quote.
How the guide price works
We multiply the new floor area by our guide rate for the type you choose, then apply your region's factor and the specification level. For two-storey types we count both floors; for an extension over a garage or on top of an existing single storey we count the new upper floor only. Extras are added as ranges. The maths is the same as our published price tables.
Your postcode is only used to pick the price region in your browser. Nothing is sent unless you complete step 4.
Ready to see what a second storey could do for your home?
Book a free site visit. We'll look at your house, talk through options and explain the approvals you'd need, then price the design stage in writing.