Extensions over a garage in Hale Barns

Hale Barns: the key facts for this kind of project.

Postcode districts: M90
County / area: Greater Manchester, England
Price region: North West England
Guide price: £30,000–£43,500 (£1,660–£2,420 per m²)
Approval route: Planning permission is needed: in England, permitted development only allows single-storey extensions to the side.
Nearest towns: Hale (Greater Manchester) (1 mile), Altrincham (1.9 miles), Timperley (2.3 miles)
Distance to Manchester: about 8.3 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.

Hale Barns sits about 8.3 miles from Manchester. Closer to home, Hale (Greater Manchester) is 1.0 miles away and Altrincham 1.9 miles.

What it costs in Hale Barns

For budgeting in Hale Barns, allow around £30,000–£43,500 for an extension over a garage with 3 m × 6 m of new first-floor space (18 m²). That's based on £1,660–£2,420 per m² including VAT for North West England. 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	£1,530–£2,230 per m²	£27,500–£40,000
Standard	£1,660–£2,420 per m²	£30,000–£43,500
Premium	£1,990–£2,910 per m²	£36,000–£52,500

Planning and building regulations in Hale Barns

In England, most garages sit beside the house, so building over one makes a two-storey extension beyond a side wall, which always needs planning permission. If the garage is at the rear, the 3 m and 7 m rules for two-storey rear extensions apply, measured from the original house. A householder application costs £548 (or £575 for applications made from 8 December 2026).

Approval in England: Householder planning application: £548 (or £575 for applications made from 8 December 2026). Lawful development certificate: £274 (about £288 for applications from 8 December 2026). Councils should decide householder applications within 8 weeks of validation.

Building regulations: Building regulations approval (full plans recommended) from the council or a registered building control approver, with a completion certificate at the end.

Design points for Hale Barns homes

Fire separation

If the garage stays a garage, the floor between it and the room above, and any door into the house, must give fire separation under building regulations. That usually means fire-resisting plasterboard ceilings, sealed gaps and a fire door, which we design in from the start.

Garage walls and the door opening

Garage walls are often a single skin of brick or block with piers, and the wide door opening needs a beam over it. Many over-garage extensions need new inner walls or a steel frame to carry the floor and to insulate properly, which we confirm before the design is fixed.

How we'd run your project

Look at the house
We start in Hale Barns with a free visit: measurements, photos, a look at the loft and drains, and a frank chat about budget.
Get it approved
Once you're happy with the design we submit it to the council for Hale Barns and deal with any questions from the planning officer.
Fixed price in writing
With approved drawings and calculations, we give you a fixed build price and a programme you can plan around.
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 Hale Barns

Who handles building regulations for a project in Hale Barns?

We handle it as part of the project. What's needed in England: building regulations approval (full plans recommended) from the council or a registered building control approver, with a completion certificate at the end. We prepare the drawings and the engineer's calculations, book the inspections and pass you the completion paperwork at the end.

How long does an extension over a garage take?

Allow 4 to 8 weeks for survey and design, then the approval period (councils should decide householder applications within 8 weeks of validation), then 4 to 8 weeks of technical design, which can overlap. The build itself usually takes 14 to 20 weeks, longer for large or complex designs.

Do I need planning permission for an extension over a garage in Hale Barns?

Hale Barns is in England, so England planning rules apply. Planning permission is needed: in England, permitted development only allows single-storey extensions to the side. If in doubt, a lawful development certificate or a planning application gives you certainty before you build.

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

Other towns near Hale Barns:

Other extensions in Hale Barns

All two-storey extension services in Hale Barns · Extensions over a garage across Greater Manchester

Ready to talk it through? Call us or send the form and we'll arrange a visit to your home in Hale Barns.