Yes, finishing a basement can significantly increase your property’s value. In London and the South East, a well-executed basement conversion can add 15–30% to your home’s value by creating additional living space in high-demand areas where square footage is at a premium.

The highest value comes from transforming the basement into functional living space—such as a bedroom with en-suite, home office, gym, or self-contained flat. Adding natural light through light wells, quality finishes, and waterproofing systems also maximises both usability and resale value.

Yes, but it must meet legal requirements for ventilation, fire safety, ceiling height, and natural light. If the basement includes a window or light well large enough to escape through in an emergency (egress), it can be classified as a habitable bedroom under building regulations.

Basements can be more expensive than other types of extensions due to excavation, underpinning, waterproofing, and structural requirements. Costs typically range from £1,500 to £3,000 per m² depending on site conditions and finish level. However, they offer a smart solution in areas where space is limited and land is valuable.

Not always. Many basement conversions fall under permitted development, especially if they don’t alter the exterior or involve major excavation. However, planning permission is usually required for new basement digs, listed buildings, or changes to the building’s façade. We’ll advise and handle all applications as part of our service.