Expanding your living space by adding an extra bedroom can be both exciting and challenging, particularly when it comes to understanding the costs involved. In the UK, bedroom extension costs typically range from £20,000 to £80,000, depending on various factors. Builders usually manage these types of projects and can provide quotes based on your specific requirements.
How much will an extension cost in 2025? In short, building a single-storey extension is likely to cost between £2,200-£3,300/m² of new internal space (excluding VAT). So a 30m² single-storey kitchen extension could be estimated at somewhere between £66,000-£99,000, plus VAT at 20%. If that sounds rather general - that's because it is.
House extension costs in the UK typically fall between £1,800 and £3,000 per square metre, depending on the finish, structure and location. That means a modest 20m 2 extension can range from about £36,000 to £60,000+, excluding premium kitchens, bathrooms and bespoke glazing. Get 3 offers.
How much does house extensions cost? UK extension costs vary widely depending on size, materials, and complexity. Industry data suggests that a single-storey rear extension starts from around £1,500 per square metre for a simpler build, while a more typical range is £1,800-£2,500 per square metre. Need more living space? Read our handy guide to the typical bedroom extension cost, whether a single or double storey extension.
House extension costs: Breakdown by size & type House extension costs vary hugely depending on the size, type and complexity of your project and where you live. We explain how much house extensions cost, including all the fees you may need to pay, and how to save money. Discover how much a house extension costs in 2025.
Explore average prices, cost breakdowns, and budgeting tips to plan your perfect home upgrade with confidence. A simple guide to estimate your house extension cost. Updated in 2025 with real survey data from residential architects on Design for Me.
Looking to build an extension in 2026? Discover the latest costs per square metre for extensions in the UK and factors that affect pricing. Find out the 2025 house extensions cost UK homeowners can expect. Learn about average prices, key factors, and tips to plan your extension.
