Garage Conversions
Your garage is wasted space. We fix that.
Garage conversions across London. Transform an underused single or double garage into a fully insulated, Building Regulations compliant bedroom, home office, gym or living space.
Professional garage conversion contractors in London.
A garage conversion is one of the fastest and most cost-effective ways to add usable living space to your home. Most garages are used for storage rather than cars — converting that space into a bedroom, home office, playroom or gym makes practical and financial sense.
However, a garage conversion is not simply a cosmetic job. To be compliant and add genuine value, it must meet Building Regulations for insulation, damp proofing, ventilation, fire safety, structural integrity and electrical standards.
RCB delivers fully compliant garage conversions — from structural assessment and Building Regulations submission through to insulation, flooring, electrics, plumbing and final decoration. The result is a warm, dry, fully integrated room that adds real value to your property.
What's included
A garage conversion typically adds 10-15% to your property value — one of the best returns on investment for home improvements
How It Works
The RCB process for this service.
Survey & Assessment
We inspect the existing garage structure, assess damp, insulation requirements and any structural modifications needed for the conversion.
Design & Regulations
Layout design for the new room, Building Regulations submission covering insulation, ventilation, fire safety and structural compliance.
Estimate & Scope
A clear, itemised estimate covering all works — structural, insulation, electrics, plumbing, finishes and decoration. No surprises.
Convert & Handover
Full conversion works — structural modifications, insulation, services, internal fit-out and Building Control sign-off for a fully compliant living space.
Planning & Regulations
Garage conversions do not usually require planning permission as they are classified as a change of use within the existing building envelope. However, Building Regulations approval is mandatory. The conversion must meet current standards for thermal insulation, damp proofing, ventilation, fire safety, structural loading, and electrical safety. If the property is in a conservation area or has specific planning conditions regarding parking, planning permission may be needed. RCB handles all regulatory submissions.
FAQs
Common questions.
Do I need planning permission to convert my garage?
In most cases, no. A garage conversion is generally classed as a permitted change of use and does not require planning permission. However, if the conversion involves changing the external appearance significantly, if your property is in a conservation area, or if there are planning conditions requiring the garage to remain as parking, you may need to apply. RCB will check your specific situation.
How much does a garage conversion cost?
A standard single garage conversion in London typically costs from £15,000 to £25,000 depending on the specification and whether plumbing is included. Double garage conversions start from around £20,000–£35,000. Costs depend on the condition of the existing garage, insulation requirements, services and the intended use of the room.
Will a garage conversion add value to my home?
Yes — a properly converted garage with Building Control sign-off typically adds 10–15% to a property value. The key is that it must be Building Regulations compliant with a completion certificate. An uncertified conversion can actually reduce value as it creates issues at point of sale.
How long does a garage conversion take?
A standard single garage conversion takes 4–8 weeks from start to completion. More complex conversions involving structural changes, en-suite bathrooms or significant services work may take longer. RCB provides a realistic programme at the estimate stage.
What happens to the garage door?
The garage door is removed and replaced with an insulated infill wall. This typically includes a window and, in some cases, a new external door. The infill wall is built to match the existing external finish of the property — brickwork, render or cladding. RCB ensures the infill is structurally sound and thermally efficient.
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Independently vetted by the UK's leading construction accreditation bodies
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