Extensions over a garage in Crumlin (Gwent)
We cover Crumlin (Gwent) and the rest of Gwent for extensions over a garage. Start with a free site visit and a plain-English view of what your house and plot can take.
Quick reference for homeowners in Crumlin (Gwent).
- Postcode districts
- NP11
- County / area
- Gwent, Wales
- Price region
- Wales
- Guide price
- £29,000–£42,000 (£1,610–£2,350 per m²)
- Approval route
- Can be permitted development in Wales if it is 10.5 m from the side boundary, set back 1 m from the front and doesn't widen the house by more than half; otherwise planning permission.
- Nearest towns
- Newbridge (0.8 miles), Abercarn (2.1 miles), Blackwood (3.2 miles)
- Distance to Newport (Gwent)
- about 8.6 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 postcode district NP11 in and around Crumlin (Gwent), along with neighbouring Newbridge, Abercarn and Blackwood.
What it costs in Crumlin (Gwent)
Our guide for Wales is £1,610–£2,350 per m² including VAT. On a project with 3 m × 6 m of new first-floor space (18 m²), that puts an extension over a garage in Crumlin (Gwent) at roughly £29,000–£42,000. 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 | £1,480–£2,160 per m² | £26,500–£39,000 |
| Standard | £1,610–£2,350 per m² | £29,000–£42,000 |
| Premium | £1,930–£2,820 per m² | £35,000–£50,500 |
Planning and building regulations in Crumlin (Gwent)
In Wales, building over a side garage can be permitted development if the result is at least 10.5 m from the boundary opposite the side wall, set back at least 1 m from the front of the house and does not widen the house by more than 50%. Garages close to the boundary usually fail these tests, so a householder application costing £585 is often needed.
Approval in Wales: Householder planning application: £585. Councils normally decide householder applications within 8 weeks.
Building regulations: Building regulations approval under the Welsh Approved Documents, which differ from England's in places (notably energy efficiency).
Design points for Crumlin (Gwent) homes
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.
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 Crumlin (Gwent) we agree what you need: bedroom count, bathroom, kitchen space, and how much garden you want to keep.
Design and approvals
We draw the extension and check it against the rules for Wales, then apply for planning permission or a certificate of lawfulness, whichever fits.
Technical design
We prepare the building regulations drawings, structural calculations and specification so the build price can be fixed.
Build and sign-off
Vetted teams working under S&K build the extension, and we arrange the building control completion certificate at the end.
Questions about extensions over a garage in Crumlin (Gwent)
How much does an extension over a garage cost in Crumlin (Gwent)?
Our guide for Wales, which covers Crumlin (Gwent), is £1,610–£2,350 per m² including VAT. A typical project with 3 m × 6 m of new first-floor space (18 m²) comes to about £29,000–£42,000. Design and approval fees are extra, and we fix the build price in writing once the design is agreed.
How long does an extension over a garage take?
Allow 4 to 8 weeks for survey and design, then the approval period (councils normally decide householder applications within 8 weeks), 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.
Which postcodes do you cover around Crumlin (Gwent)?
We cover Crumlin (Gwent) (NP11) and nearby places including Newbridge, Abercarn and Blackwood, plus the rest of Gwent. The first site visit is free.
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.
Can I add an en-suite above the garage?
Yes, and it is a common choice for a main bedroom. The en-suite needs an extract fan under Part F, a route for the soil pipe down to the drains and enough fall for the waste, which can be harder over a garage. We plan the pipe route through the garage or an outside wall early.
Nearby
We also cover places near Crumlin (Gwent), including:
Other extensions in Crumlin (Gwent)
- Rear
- Side
- Wraparound
- Part two-storey
- First floor
- Semi-detached
- Detached
- Kitchen and bedrooms
- Bedroom and en-suite
All two-storey extension services in Crumlin (Gwent) · Extensions over a garage across Gwent
Book a free site visit in Crumlin (Gwent) and we'll tell you what's possible, what approvals you need and what the design stage would cost.