House Extension Guides

Everything you need to know about extension costs, planning, and building. Typical costs £1,400-£2,500/sq m for single storey, £1,700-£3,200/sq m for double storey.

Read the full guide

• House Extension Cost Guide UK 2026, single vs double storey, regional differences, what's included and excluded

Plan your project

• Use our renovation cost calculator for an instant ballpark for your extension
• Compare with a loft conversion if you want more space without extending the footprint