The short answer
Converting a garage into a bedroom typically costs £10,000–£18,000 in 2026, rising to £15,000–£25,000 or more if you add an en-suite. A plain bedroom needs insulation, the door infill, a window, electrics, heating and finishing; an en-suite adds plumbing and drainage, which is the main extra cost. Building regulations apply, including standards for fire escape, ventilation and insulation. These are typical illustrations, not quotes — see the main cost guide for whole-job context.
A garage converted into a bedroom is one of the most popular conversions, because it adds a genuinely useful room without extending the footprint of the house. The cost depends mostly on whether you want a simple bedroom or a bedroom with an en-suite, and on the condition of the garage. This guide sets out realistic 2026 figures and explains what drives them. All figures are typical illustrations, not quotes, and the work should be carried out by a garage conversion specialist who handles building control.
Bedroom conversion at a glance
- Bedroom (no en-suite) £10,000–£18,000
- Bedroom with en-suite £15,000–£25,000+
- Usable space (single garage) ~12–16m²
- Main extra cost En-suite plumbing & drainage
- Fire escape Building regs requirement
- Planning Usually permitted development
What a bedroom conversion includes
A bedroom conversion brings the garage up to habitable standard: insulating the floor, walls and roof; damp-proofing; infilling the garage door opening with a wall and usually a window for light and ventilation; adding electrics, heating and lighting; and plastering, flooring and decorating. Building regulations set requirements for a means of escape in case of fire, for ventilation, and for thermal performance, all of which a garage conversion specialist will design in. See building regulations for a garage conversion for what must be met.
| Option | Typical cost (2026) | Main cost drivers |
|---|---|---|
| Bedroom, no en-suite | £10,000–£18,000 | Insulation, door infill, finish |
| Bedroom with en-suite | £15,000–£25,000+ | Plumbing, drainage, fitted bathroom |
| Higher-spec en-suite | £20,000–£30,000+ | Quality fittings, layout changes |
Why an en-suite adds the most
Adding an en-suite is usually the single largest extra cost in a bedroom conversion, because it brings in plumbing and drainage that a dry room does not need. Running waste to the existing soil stack, supplying hot and cold water, and tanking and fitting the bathroom all add labour and materials. If the garage is far from existing drainage, a pumped waste system may be needed, which adds more. The same principle applies to any wet room — see converting a garage into a kitchen or utility.
Fire safety and other regulations
Because a bedroom is a room people sleep in, building regulations are particularly concerned with fire safety. The conversion usually needs an adequate means of escape — often a suitably sized openable window — and may require fire-resistant construction and interlinked smoke alarms, especially where the garage connects to the main house. A garage conversion specialist designs these in and arranges building control sign-off. This is general information; your actual cost and the exact requirements depend on your specific garage, and the work should be carried out by a specialist who handles building control.
Compare garage conversion quotes
Bedroom conversion costs depend heavily on the en-suite and finish. Compare itemised quotes from FMB-registered or building-control-approved specialists in your area.
Frequently asked questions
How much does it cost to turn a garage into a bedroom?
Typically £10,000–£18,000 for a bedroom without an en-suite in 2026, or £15,000–£25,000 or more with an en-suite. The figure depends on the garage’s condition, the finish and whether plumbing is needed. These are typical illustrations, not quotes.
Can a converted garage be used as a bedroom under building regulations?
Yes, provided the conversion meets building regulations — including an adequate means of escape in case of fire, ventilation, insulation and, where relevant, interlinked smoke alarms. A garage conversion specialist designs these in and arranges building control sign-off. See building regulations for a garage conversion.
Do I need planning permission to convert a garage into a bedroom?
Usually not, as converting within the existing footprint normally falls under permitted development — though this excludes flats, listed buildings and conservation areas, and areas where permitted development rights have been removed. Building regulations always apply. See planning permission for a garage conversion.
Sources & further reading
- Federation of Master Builders (FMB) — garage conversion costs and finding registered builders
- Planning Portal — permitted development for garage conversions
- GOV.UK / Building Regulations Approved Documents B (fire), L (energy) and C (damp) — habitable room standards
- RICS — guidance on home improvement costs and value
This is general information, not advice for your specific property or conversion, and not a quote. Figures are typical illustrations only. The work should be carried out by an FMB-registered or building-control-approved garage conversion specialist. We are an independent information and introduction service, not a builder.