The £1,350-£2,250 price, however, is a very good range of pricing based on averages. And that’s all you can expect when you have no detail or idea of what the extension looks like, or what materials you’re going to use, or how it is going to be built (and who’s going to do it). If that sounds suitably general - that’s because it is. So a 30m² kitchen extension could be estimated at somewhere between £40,500-£67,500, plus, VAT at 20%. In short, most extension projects cost around £1,350-£2,250/m² of new internal space. (Image credit: IDSystems) How Much Does an Extension Cost? Open up an extension, connecting inside and out, with bifold doors like these SUNFLEX SF55 Aluminium bifold doors by IDSystems (opens in new tab). Once you’ve got an overview, you can also use our extension cost calculator to get a more detailed estimate of how much your extension will cost. While these figures may not match up perfectly with your builders quotes or estimates, and may differ depending on where you live in the UK, they should give you a good indication on the costs involved. However, it's important to be able to have a grasp on how much an extension costs to decide whether its viable at all to be building an extension to your home, so with that in mind, we've created an easy reference which offers some ballpark figures you can use to start to consider your project.
How big your extension is, for example, the materials you're using, the volume of glazing - every choice will affect the final price when extending, and that's before you get into additional costs such as surveys, structural engineer fees, planning permission and more.
Before you can get a clear answer about the costs involved for your extension, you'll need to consider different variables.
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