UK Home Extension Costs in 2026: Reddit Homeowners Share Real Prices
According to a 2026 report on the costs associated with home extensions in the UK, informed by experiences shared by homeowners on Reddit and expert insights, small rear extensions typically range from £35,000 to £65,000. Medium extensions are priced between £60,000 and £100,000, while large ones can cost £90,000 to £180,000. Side return extensions fall within £45,000 to £90,000, and wrap-around extensions start at £90,000, going over £180,000. Double-storey extensions can reach £90,000 to £250,000+. These estimates do not cover kitchens, bathrooms, landscaping, or professional fees, and hidden costs may increase totals by 10–20%. Homeowners are advised to prepare a detailed project brief, set aside a 10–15% contingency, and seek multiple quotes, as extending may ultimately be more economical than relocating.
Key facts
- Small rear extension: £35,000–£65,000
- Medium rear extension: £60,000–£100,000
- Large rear extension: £90,000–£180,000
- Side return extension: £45,000–£90,000
- Wrap-around extension: £90,000–£180,000+
- Double-storey extension: £90,000–£250,000+
- Hidden costs can add 10–20% to total
- Contingency of 10–15% recommended
Entities
Institutions
- Commission It
Locations
- United Kingdom