Garage conversions, Liverpool.
Turning a cold, unused garage into a room that is genuinely warm, dry and usable all year — to current building regulations, signed off and certificated.
A garage conversion is the cheapest square metre most houses can gain, because the roof, the walls and the slab already exist. It is also the job most often done badly, because the parts that make it a proper room — the floor build-up, the insulation and the damp protection — are the parts you cannot see once it is finished.
The work
A room, not a boarded garage.
The garage door comes out and a new insulated wall is built off a foundation that will actually carry it, with a window or doors set into it. Where the existing slab sits too low, the new floor is built up with a damp proof membrane, insulation and a screed or boarded deck to reach a level and thermally compliant finish.
Walls and ceiling are insulated and lined to current standards, not battened and plasterboarded straight onto damp masonry. New heating is added and sized for the room, along with electrics, lighting, sockets, data and ventilation. Then plastering, flooring, skirting, architrave, internal door and decoration.
Where the garage is integral to the house, fire separation to the remaining garage or to the house has to be considered, along with the means of escape from the new room. That is building control's concern and it is dealt with as part of the application, not left for someone to discover.
Viability
We will tell you if it will not work.
Not every garage should be converted, and the survey exists to establish that before you spend anything. The three things that most often stop a conversion are a slab too low to achieve the required floor build-up without dropping the finished level below the external ground, existing foundations that will not support a new load-bearing wall, and drainage or a manhole in exactly the wrong place.
If any of those apply, we will say so at the site visit rather than pricing a job that will run into trouble. Sometimes the answer is a modest extension instead; sometimes it is to leave the garage alone and put the money elsewhere.
Where it is viable, you get a sectioned written quotation covering the whole conversion through to decoration, plus the building regulations application and inspection fees, so there is one number and no surprises.
What drives the price
What changes a conversion cost.
- Slab level
- Whether the floor can be built up as needed
- Foundations
- Whether a new wall needs new footings
- Services
- Heating, circuits, ventilation, drainage
- Fire separation
- Integral garages and escape routes
Also
Other ways to gain space.
House extensions
Where a conversion will not give you enough, an extension is the next option and often the better one.
Full house renovations
Converting the garage as part of a wider refurbishment shares the trades and the disruption.
Kitchen renovations
Some conversions become a utility or a kitchen extension of the existing room.
Common questions
Before you convert.
Do I need planning permission to convert my garage?
Usually not, if the garage is attached and you are not altering the external appearance beyond replacing the door with a wall and window. But it is not automatic — some estates have conditions or Article 4 directions that remove that right, and flats and listed buildings are different again. Building regulations approval is required either way, because you are turning a cold unheated store into habitable space.
Can any garage be converted?
Most attached garages can. The things that stop it are a floor slab too low to get the required build-up and damp protection, foundations that will not take the new wall, or a structure that was never built to support anything. We check the slab level, the existing foundations and the drainage at survey and tell you straight if it is not viable.
What does the work actually involve?
Removing the garage door and building a new insulated wall and window opening off a proper foundation. Then a new floor build-up with damp proof membrane and insulation, insulating and lining the walls and ceiling to current thermal standards, new heating, electrics and lighting, ventilation, plastering, flooring, joinery and decoration. Where the garage was integral you also need to think about fire separation and any means of escape.
Will it be cold?
Not if it is done properly. A converted garage has to meet the same thermal standards as an extension, which means insulated floor, walls and roof, and a heat source sized for the room. The reason converted garages have a reputation for being cold is that many were converted without any of that.
Will I lose value by losing the garage?
Honest answer: it depends on the street and the house. On a property where off-street parking is scarce and the garage is genuinely usable, losing it can cost you. On the many houses where the garage is too narrow for a modern car and is used as a store, converting it into a proper room usually adds more than it takes. We will give you our view but you should also ask a local agent.
Enquiries
Find out if it works.
Send us the address and a couple of photos of the garage inside and out, including the floor at the door threshold. We will come and check the slab, the foundations and the drainage and tell you honestly whether it is worth doing.