Extensions over a garage in Downpatrick
Our extensions over a garage service in Downpatrick covers everything: measured survey, design, planning or permitted development checks, structural design, building control and the build itself.
Quick reference for homeowners in Downpatrick.
- Postcode districts
- BT30
- County / area
- County Down, Northern Ireland
- Price region
- Northern Ireland
- Guide price
- £27,500–£40,500 (£1,540–£2,240 per m²)
- Approval route
- Planning permission is needed: permitted development side extensions in Northern Ireland can't be more than 4 m high, which rules out two storeys.
- Nearest towns
- Ballynahinch (8.9 miles), Newcastle (10.4 miles), Carryduff (14.8 miles)
- Distance to Bangor (County Down)
- about 23.1 miles
- First visit
- Free, no obligation
About an extension over a garage
An extension over a garage suits you if you have an attached single garage beside the house and need an extra bedroom or a larger main bedroom with an en-suite. You get an inspection of the garage structure, a design that matches the house, the approvals your nation needs, structural design, building regulations approval and the build, carried out by vetted teams working under S&K.
We cover postcode district BT30 in and around Downpatrick, along with neighbouring Ballynahinch, Newcastle and Carryduff.
What it costs in Downpatrick
A guide price for Downpatrick: around £27,500–£40,500 for 3 m × 6 m of new first-floor space (18 m²). That works out at £1,540–£2,240 per m² of new floor space, including VAT at 20%. These are guides, not quotes. Ground conditions, steelwork and access can move the figure either way.
| Spec | Per m² | 3 m × 6 m of new first-floor space (18 m²) |
|---|---|---|
| Essential | £1,420–£2,060 per m² | £25,500–£37,000 |
| Standard | £1,540–£2,240 per m² | £27,500–£40,500 |
| Premium | £1,850–£2,690 per m² | £33,500–£48,500 |
Planning and building control in Downpatrick
In Northern Ireland, permitted development for two-storey work is set out for rear extensions, so building over a side garage normally needs a planning application, which costs £347 per dwelling. Councils aim for an average of 15 weeks for local applications. Building control approval is also needed, including fire separation if the garage stays in use.
Approval in Northern Ireland: Planning application for works to a house: £347. Councils aim to decide local applications within an average of 15 weeks; many take longer.
Building control: Building control approval from the local council under the Building Regulations (Northern Ireland), using the Technical Booklets.
Design points for Downpatrick homes
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.
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.
How we'd run your project
Free site visit
We visit your home in Downpatrick, look at the structure, access and boundaries, and talk through what you want the new rooms to do.
Choose the approval route
Some designs fit permitted development, most need a householder application. We decide which applies in Northern Ireland before drawing in detail.
Engineer it
Foundations sized for two floors, steels for any openings, and building control approval, all before anyone starts on site.
On site
One project lead runs the job, keeps you updated and arranges inspections at each stage until completion.
Questions about extensions over a garage in Downpatrick
How much does an extension over a garage cost in Downpatrick?
Our guide for Northern Ireland, which covers Downpatrick, is £1,540–£2,240 per m² including VAT. A typical project with 3 m × 6 m of new first-floor space (18 m²) comes to about £27,500–£40,500. Design and approval fees are extra, and we fix the build price in writing once the design is agreed.
Do I need planning permission for an extension over a garage in Downpatrick?
Downpatrick is in Northern Ireland. Planning permission is needed: permitted development side extensions in Northern Ireland can't be more than 4 m high, which rules out two storeys.
Which postcodes do you cover around Downpatrick?
We cover Downpatrick (BT30) and nearby places including Ballynahinch, Newcastle and Carryduff, plus the rest of County Down. The first site visit is free.
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
The same service in neighbouring towns:
Other extensions in Downpatrick
- Rear
- Side
- Wraparound
- Part two-storey
- First floor
- Semi-detached
- Detached
- Kitchen and bedrooms
- Bedroom and en-suite
All two-storey extension services in Downpatrick · Extensions over a garage across County Down
Want a figure first? Try our guide price tool, then book a free visit to firm it up.