Basement conversions offer a powerful way to create more living space – particularly in areas where expanding outward or upward is restricted. Whether you're working with an existing cellar or planning a full new basement excavation, these projects can add valuable square footage while preserving the character of the main house.

In terraced homes, basement conversions often allow for additional bedrooms, home cinemas, playrooms or utility spaces. In larger detached properties, they can house entire self-contained flats, gyms or spa areas. With the right design, lower-ground spaces can feel just as bright and welcoming as any other floor. At Otford Farm (pictured above) the space contains a wine room, home gym and cinema.

Daylight is a key consideration – which is why lightwells, glazed staircases and clever interior layouts are so important. Good waterproofing and ventilation are also essential, and early input from structural and drainage consultants can avoid issues later on.

Planning permission may be required depending on the extent of the excavation, and Party Wall Agreements are often part of the process. Working with someone familiar with basement schemes helps avoid common pitfalls and ensures a high-quality finish.

Basement conversions can be complex, but when done well, they make homes more flexible, future-proof and desirable.