Basement Conversions

Basement Conversions That Add Space, Value and Character.

In London, space is precious — and sometimes, the only way is down. At Mayfair Interiors, we specialise in high-end basement conversions that transform dark, unused cellars into light-filled, practical rooms. From excavation and waterproofing to finishes and lighting, every stage is planned and delivered by our in-house team.

Below are examples of how we’ve helped homeowners unlock new possibilities beneath their homes.