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.
How much does a house extension cost in 2025? There's no 'one size fits all' option when it comes to expanding your home. However, the average cost of a house extension ranges between £30,000 - £140,000 for a single storey, and £108,000 - £180,000 for two storeys. 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. 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. Find out how much a house extension costs, including detailed breakdowns of single and double storey extension prices and get accurate, real.
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.
The prices in this guide are accurate as of 2025* Average installation and materials costs for a house extension A home extension can add value to your home. It will also give you more space, so whether you're looking to add a bedroom, or make your living room bigger, there are plenty of good reasons to extend your property. Prices rise the more south you live in the UK, with London having.
A simple guide to estimate your house extension cost. Updated in 2025 with real survey data from residential architects on Design for Me. This guide breaks down the cost of extensions, including house extension cost per m², single storey extension options, and how much small extensions cost.
