Garage Conversions

Thames Design & Build

Garage Conversions in Surrey & South West London

Converting an underused garage is one of the most cost-effective ways to add living space to your home, turning a space that often just stores clutter into a usable room — a home office, gym, playroom, extra bedroom, or even a self-contained annexe.

Thames Design & Build provides garage conversions to properties located across South West London and Surrey, in areas including Kingston, Thames Ditton, Esher, Molesey, Walton-on-Thames, Cobham, Oxshott, Wimbledon, Richmond, Epsom, Leatherhead, Twickenham, Sheen, Kew, Dorking and Guildford. 

Key Garage Conversion Facts

One of the most affordable ways to add a room, as the structure already exists

Many clients convert only part of the garage, keeping the rest as storage for bikes, a utility area, or a WC

Usually falls under Permitted Development, as the work is internal and doesn't enlarge the building

Most projects take 4–8 weeks from start to completion

Thames Design & Build

Our Process For Garage Conversions

We handle everything from initial design through to final completion. Your project starts with a site visit where we assess the existing garage, floor levels, wall construction, and how the space connects to the rest of your home. Our design team then creates detailed drawings, and we handle any building regulations approval needed. Once approved, we provide a fixed-price quote covering all aspects of the build.

Two things make a real difference to a garage conversion. The first is the floor: if there’s already a step down from the house into the garage, there’s usually enough depth to install a damp-proof membrane, insulation, and screed over the existing slab. If not, the slab may need to come up, which adds to the cost – we’ll establish this at the survey stage so there are no surprises. The second is the external wall: many garages have only a single skin of brickwork, so we tank the wall internally and build an insulated timber frame behind it to keep the room warm and dry. During construction, your dedicated site manager coordinates all trades and keeps you updated throughout.

Recently completed garage conversions

Ready to Transform Your Home?

Tell us about your plans for your home in Kingston, Wimbledon, Richmond, Esher, Cobham, Guildford and the surrounding areas. Our design and build team will guide you from first ideas through planning, approvals and construction.

Ready to Transform Your Home?

Tell us about your plans for your home. Our design and build team will guide you from first ideas through planning, approvals and construction.

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