5 Tips to Build a DIY Summer House

There are lots of ways to make use of your garden to gain more space in your home. A popular one is the summer house—easy to build, cost-effective and DIY-friendly. Here are five essential considerations before starting your project.

Check about planning permission

Most summer houses under 15m² won’t require planning permission—but always check first.

While summer houses usually fall under permitted development, it is always best to confirm with your local authority. Height, size and proximity to boundaries determine whether permission is needed. If planning is required, the process usually takes 4–6 weeks.

Choose your building material

Once you know the size of your summer house, the next step is choosing materials. Timber frame kits are a popular option—they remove the need for complex measuring and ensure everything fits correctly.

Most kits offer external cladding options, giving you an attractive and low-maintenance finish. Roofing typically uses thick felt, often applied in multiple layers, nailed securely to the frame.

Get the right foundation

A solid foundation is essential. Concrete bases are the most durable, while slab foundations offer a more budget-friendly alternative. The ground must be level beforehand, and ready-mix concrete is ideal for forming either slabs or full bases.

Finishing touches

Once the frame, roof and base are in place, you can focus on finishing touches. Windows and doors—often optional extras in kit packages—can be double glazed for better insulation and year-round comfort. Interior decoration and furniture choices depend on your intended use, with home offices being increasingly popular.

Don’t forget electricity!

If you want lighting, heating or power outlets, a qualified electrician is essential. They’ll connect the summer house to your home’s mains supply, install switches, sockets and fittings, and ensure everything meets safety standards.

Last updated: 26 November 2025