Extensions over a garage in Alexandria
For an extension over a garage in Alexandria, the first questions are always the same: how big, which approvals, and what it will cost. This page answers all three for Glasgow and Dunbartonshire.
The basics for Alexandria at a glance.
- Postcode districts
- G83
- County / area
- Glasgow and Dunbartonshire, Scotland
- Price region
- Scotland
- Guide price
- £29,500–£43,000 (£1,640–£2,400 per m²)
- Approval route
- Planning permission is usually needed: Class 1B permitted development only applies if every part of the extension is at least 10 m from all boundaries. A building warrant is needed before work starts.
- Nearest towns
- Bonhill (1.3 miles), Vale of Leven (1.6 miles), Dumbarton (3.5 miles)
- Distance to Glasgow
- about 15.5 miles
- First visit
- Free, no obligation
About an extension over a garage
An extension over a garage is a new first-floor room built on top of an existing attached garage, usually a bedroom, en-suite or study. It uses a footprint you already have, so it adds floor space without taking any garden. The garage walls and foundations often need strengthening or replacing to carry the new floor.
We cover Alexandria (G83) and the places around it, including Bonhill (1.3 miles), Vale of Leven (1.6 miles) and Dumbarton.
What it costs in Alexandria
A guide price for Alexandria: around £29,500–£43,000 for 3 m × 6 m of new first-floor space (18 m²). That works out at £1,640–£2,400 per m² of new floor space, including VAT at 20%. Professional fees for drawings and the structural engineer are listed separately on our prices page.
| Spec | Per m² | 3 m × 6 m of new first-floor space (18 m²) |
|---|---|---|
| Essential | £1,510–£2,210 per m² | £27,000–£39,500 |
| Standard | £1,640–£2,400 per m² | £29,500–£43,000 |
| Premium | £1,970–£2,880 per m² | £35,500–£52,000 |
Planning and building standards in Alexandria
In Scotland, a room over a garage makes the extension more than one storey, so Class 1B applies, which needs at least 10 m to every boundary for permitted development. Attached garages are rarely that far from the boundary, so expect a householder application (£371, decided within two months) and a building warrant.
Approval in Scotland: Householder planning application: £371. Councils have two months to decide a local planning application.
Building standards: A building warrant from the council's building standards service before work starts, and a completion certificate at the end. Scotland uses its own Technical Handbooks.
Design points for Alexandria homes
Matching the house
A room over a garage usually sits beside the front of the house in full view, so roof form, ridge height, windows and brick matter. Setting the front wall and ridge back slightly from the main house usually helps it look as if it belongs.
Checking the garage foundations
Garages are often built on shallow strip footings sized for a single-storey wall and a light roof. A trial hole shows their depth and condition, and the engineer decides whether they can carry two storeys or need underpinning or new foundations inside the garage.
How we'd run your project
Understand the brief
At your home in Alexandria we agree what you need: bedroom count, bathroom, kitchen space, and how much garden you want to keep.
Get it approved
Once you're happy with the design we submit it to the council for Alexandria and deal with any questions from the planning officer.
Price it properly
Once the engineer's calculations are in, we fix the build price in writing, with a clear list of what's included.
Build and hand over
We manage the build from groundworks to decoration-ready finish and hand over with the completion paperwork.
Questions about extensions over a garage in Alexandria
Which postcodes do you cover around Alexandria?
We cover Alexandria (G83) and nearby places including Bonhill, Vale of Leven and Dumbarton, plus the rest of Glasgow and Dunbartonshire. The first site visit is free.
Do I need planning permission for an extension over a garage in Alexandria?
Alexandria is in Scotland. Planning permission is usually needed: Class 1B permitted development only applies if every part of the extension is at least 10 m from all boundaries. A building warrant is needed before work starts.
Who handles building standards for a project in Alexandria?
We handle it as part of the project. What's needed in Scotland: a building warrant from the council's building standards service before work starts, and a completion certificate at the end. Scotland uses its own Technical Handbooks. We prepare the drawings and the engineer's calculations, book the inspections and pass you the completion paperwork at the end.
How do I get into a room over the garage?
Usually through a new opening off the existing landing or a bedroom, so the stairs stay where they are. If the floor levels do not match, a step or two may be needed inside the new room. Where a landing opening is not practical, a new stair from a converted garage is an option.
Do I need to convert the garage as well?
No. You can keep the garage for parking or storage and build only the room above, as long as the floor between them and any door into the house meet fire separation rules. Converting the garage at the same time is often good value, because the walls and foundations may be upgraded anyway.
Nearby
Close to Alexandria? We work across the area, including:
Other extensions in Alexandria
- Rear
- Side
- Wraparound
- Part two-storey
- First floor
- Semi-detached
- Detached
- Kitchen and bedrooms
- Bedroom and en-suite
All two-storey extension services in Alexandria · Extensions over a garage across Glasgow and Dunbartonshire
Ready to talk it through? Call us or send the form and we'll arrange a visit to your home in Alexandria.