Are you looking to build an extension and want to find out how much it will cost?

Try out our free handy extension build cost calculator. This will show you a ballpark figure of how much it might cost you to build your extension.

Remember, this figure is just a guide. There are many variables which will affect the cost of building your extension – this includes level of specification, complexity of job, build methods, ground conditions, access, material and labour prices and how effectively the project is managed. This extension build cost calculator also doesn’t include external works such as landscaping, driveways etc.

You’ll also need to take into account VAT; the indicative figure shown above is net of VAT. It’s a complicated subject so it’s best getting advice directly from HMRC.

For an accurate and detailed estimate for your build project please get in contact with our estimating service on 0117 916 7894 or email them at: