Expanding your home into your back garden offers the opportunity to create a bright orangery, modern open plan kitchen, or even additional bedrooms for new family members or guests. You can often build a single-storey rear extension without the need for planning permission, but a multi-storey rear extension can significantly increase the amount of space in your home and the overall house value when you come to sell.

How Much Does a Rear Extension Cost?

As a ballpark figure, you can expect to pay £1,200-£1,500+VAT for a single storey extension (without special features such as bi-fold doors or tiling), and if you would like to build a multi-storey extension you will need to add 50% to that price.

Your final figure depends on the size of your conversion, materials used, and whether your project requires planning permission.

Do I Need Planning Permission for My Extension?

Single storey rear extensions can typically be built as a permitted development if you are willing to build using materials that match your existing home and if you do not need more room than permitted developments allow. For exact specifications, please see our Planning Permission for Extensions page.

Many clients prefer to go through the planning process simply because it offers more opportunities, such as creating double-height rooms or multi-storey extensions and building using modern materials and styles, rather than blending your extension in with the existing house style. If you need planning permission for your project, we will work with our architectural partners to ensure that your design is perfect and to take the stress out of the process.

Planning a Perfect Extension

Planning is the most important part of your home improvement project – a well-considered plan is essential to staying on budget and ensuring that you get the house extension that you want. We work with you to consider every aspect of your house extension, including the style, materials, plumbing requirements, and implications for your existing homes.

If you have any questions or would like a transparent, no-obligation quote, please get in touch. Our team are always happy to help.