Extensions

What a double storey extension really costs in 2026, from per m² rates and size tables to fees, planning permission and whether it is cheaper to build up or out.

What a single storey rear extension costs in 2026, with all-in prices for every common size from 3m × 3m to 8m × 4m.

UK garden room and garden office prices for 2026, from DIY kits to bespoke builds, with foundations, electrics, planning and building regs explained.

What an orangery extension really costs in the UK in 2026, by size, specification and region, plus building regs, planning and conversion costs.

What a kitchen extension really costs in 2026, with the build and the new kitchen priced separately so you can set a realistic budget.

A full 2026 guide to UK conservatory prices by style, size, frame, roof type and region, with building regs and planning explained.

What a house extension costs in 2026: single storey, double storey, kitchen, side return and wrap-around prices per m², regional costs, fees and VAT.