Converting a garage is a cost-effective way to gain a bedroom, home office, playroom, gym or utility room without building out into the garden. Because the walls and roof already exist, it is usually cheaper and quicker than a full extension.
Costs are typical UK ranges for building work and vary with the size of the garage and your specification. They are guides, not quotes.
What does a garage conversion cost?
Roughly:
- Single garage conversion (basic habitable room): about £10,000–£25,000
- Double garage conversion: about £20,000–£40,000
- Adding a bathroom, kitchen or bespoke fit-out: extra, depending on plumbing and finish
The biggest cost variables are the floor, the new front wall and window, insulation, heating and electrics.
Do you need planning permission?
Converting an integral or attached garage into living space is often permitted development when the work is internal and the outward appearance does not change significantly. However:
- Planning conditions attached to your original house approval may require the garage or parking space to be kept
- changes to the front elevation (for example, replacing the garage door with a window) may need permission in some areas
- conservation areas, listed buildings and flats have tighter rules
- detached garages and any extension of the building are treated differently
Welsh rules can differ from English ones, so ask Newport City Council or a planning professional. See our planning permission guide.
Building regulations are essential
A garage was never built as a habitable room, so a conversion must meet building regulations covering:
- Floor: damp-proofing and insulation, often raising the floor level to match the house
- Walls and roof: thermal insulation and moisture control
- Replacing the garage door: a well-insulated, properly founded wall with a window
- Ventilation and fire safety: smoke alarms and escape routes, especially if it opens onto a kitchen or hall
- Electrics, heating and lighting: safely installed and certified
Read more in building regulations for house extensions.
Planning the layout
Think about how you will use the space:
- Home office: good natural light, sockets and internet
- Bedroom or guest suite: heating, ventilation and an en-suite if possible
- Utility or boot room: keep plumbing close to existing pipes to reduce cost
- Gym or playroom: durable floors and sound insulation from the main house
Parking and storage
Losing a garage means losing storage and potentially parking. Make sure you still have somewhere for the car if your street is restricted, and plan alternative storage, such as a shed or loft space.
How long does it take?
A single garage conversion is commonly around 3–6 weeks on site, depending on the extent of the work.
Will it add value?
A well-done garage conversion adds usable living space and can increase value in many areas. In places where off-street parking is scarce, losing a garage can offset that, so ask a local estate agent.
Need a garage converted in Newport?
Abron Contracting can inspect your garage, explain what is needed to meet regulations and provide a clear written quote. Contact us or call 01633379170.
Frequently asked questions
How much does a garage conversion cost?
A single garage conversion typically costs about £10,000–£25,000 and a double garage about £20,000–£40,000, depending on specification and whether you add a bathroom or kitchen.
Do I need planning permission to convert my garage?
Often not for internal conversions, but check for planning conditions, front elevation changes and local restrictions. Confirm with the council.
Do I need building regulations approval?
Yes. A converted garage must meet building regulations for insulation, damp, ventilation, fire safety and electrics.
Can I still park a car after converting?
Only if you have a driveway or other space. Check parking needs before you start.
How long does a garage conversion take?
Typically a few weeks on site for a single garage, once design and approvals are in place.
