Many single-storey rear extensions fall under Permitted Development Rights, meaning no planning application is needed, but there are strict size and height limits. Larger extensions and anything over two storeys usually require full planning permission. We always advise checking with your local council before work begins, and we’re happy to guide you through the process.

Even where planning permission isn’t required, building regulations approval almost always is. These cover structural integrity, fire safety, insulation, drainage and energy efficiency. We handle building regulations compliance as a standard part of every project.

In most cases, yes. A well-designed extension adds usable space and improves functionality, both of which buyers value. The return depends on your location, the quality of the build, and the local property ceiling. We recommend speaking to a local estate agent before committing, so you go in with realistic expectations. We’re also happy to share what we’ve seen from similar projects in your area.

For most extensions, especially if you’re altering load-bearing walls or adding more than one storey, you’ll need both a structural engineer and either an architect or experienced designer. We work with trusted professionals and can recommend contacts if you don’t have your own.

Timescales vary significantly depending on the scale and complexity of the work. A straightforward single-storey extension typically takes 10–16 weeks on site. New builds and larger projects will take longer. We provide a detailed programme before work begins, so you know exactly what to expect and we keep you updated throughout.