Get instant clarity on your project budget with our easy-to-use extension cost calculator. Whether you’re planning a small kitchen extension or a full double-storey build, this tool gives you a quick, reliable estimate based on real-world construction costs. Simply enter a few details about your project—such as size, location, and specification—and you’ll receive an instant breakdown to help you understand what your extension is likely to cost.

Using this extension cost calculator is the best first step before speaking with architects or builders. It removes the guesswork by giving you a tailored cost range, helping you determine what’s achievable within your budget. By comparing different sizes, layouts, and finish levels, you can make informed decisions early on and avoid unexpected expenses later in the process.

As you adjust your inputs, the calculator updates in real time, giving you a clear picture of how design choices affect your overall budget. Whether you’re exploring ideas or preparing for formal quotations, our online extension cost calculator provides the insight you need to plan confidently. Start calculating now and get one step closer to creating the extra space your home needs.