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Garage conversions: what affects the cost, and the warrant

Garage conversions: what affects the cost, and the warrant

A garage already has walls, a roof and a floor, but turning it into a warm, dry room that meets the building regulations takes more than it first appears.

The floor

Garage floors are usually lower than the house and not insulated. Raising and insulating the floor, with a damp proof membrane, is a large part of most conversions.

The garage door opening

The door opening is usually filled with a new wall, often with a window. That wall needs a proper base underneath it.

The walls and roof

Garage walls and roofs normally need insulating to meet the building regulations, and sometimes the roof needs more work than that.

Connecting to the house

Making an opening through to the house, or changing the existing doorway, may need structural work and fire separation.

Heating, electrics and plumbing

The new room needs heating, lighting and sockets, and any plumbing if it includes a shower room or utility.

The building warrant

Converting a garage into a habitable room needs a building warrant in Scotland. Our sister company, CWJ Architectural Design Services, prepares the drawings and the application, and we deal with the council through to the completion certificate.

How we price it

Our quantity surveyors price the build from the approved warrant drawings. Finishing items are listed separately with their own prices, and what is not included is written down as clearly as what is.

Garage converted into a home office and snug with built-in oak joinery (illustrative image)
Talk it through

Every project starts with a site visit

Guides only go so far. We come out, look at the house and talk through what is involved for yours.

Design, planning, the building warrant, the price and the build are all handled by one company, so you have one team to ask.

See garage conversions →

Questions

Common questions

Does a garage conversion need a building warrant?

Yes. Turning a garage into a habitable room needs a building warrant. We handle it through our sister company, CWJ Architectural Design Services.

Does a garage conversion need planning permission?

Sometimes. It depends on the house and what changes outside. We check this at the start.

Is there a free guide?

Yes. Our free 12-step playbook covers what you need to know about creating more space with a garage conversion.

Start your project

Planning something?

Tell us what you have in mind and where you are. We will come back to you to arrange a site visit.

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