A garage conversion is one of the most cost-effective ways to add usable living space to your home without extending the building footprint. Whether you want an extra bedroom, a home office, a playroom, or a gym, RCB Design & Build transforms your single or double garage into a fully insulated, heated, and finished room that meets Building Regulations. We handle every aspect — structural opening infill, damp proof membrane, floor insulation and levelling, wall insulation, electrics, plumbing (if needed), plastering, and decoration. Second-fix materials (flooring, tiles, fixtures) are client-supplied so you choose your own specification.
Convert a standard single garage into a bedroom, office, or living room. Includes new front wall, insulation, electrics, and full internal finish.
Convert a double garage into a larger living space, or divide into two separate rooms such as an office and utility room.
Convert the built-in garage beneath or beside the main house. Often the easiest conversion as it shares walls and roof with the existing property.
Convert a standalone garage into a habitable space. Requires additional consideration for insulation, damp proofing, and independent services.
In most cases, no. Converting an integral or attached garage to a habitable room is generally permitted development, provided you are not changing the external appearance significantly. Detached garage conversions and properties in conservation areas may need planning permission. We check during the free site visit.
A single garage conversion typically costs £15,000–£25,000. Double garage conversions range from £25,000–£40,000 depending on the extent of structural work, insulation, and services required. We provide a fixed written quotation after the site visit.
Yes. All garage conversions require Building Regulations approval to ensure the room meets standards for insulation, ventilation, damp proofing, fire safety, electrics, and structural integrity. We submit the application and manage all inspections on your behalf.
We install a damp proof membrane (DPM) across the floor and, where needed, the walls. The floor is insulated and levelled with a new screed or timber floor system. We also ensure adequate ventilation to prevent condensation. This creates a dry, comfortable living space.
A straightforward single garage conversion takes 4–6 weeks. Double garage conversions and projects requiring significant structural work take 6–8 weeks. We provide a detailed programme at estimate stage.
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