Two-storey side extensions in Bartley Green
A two-storey side extension is one of the most space-efficient ways to add bedrooms and living space to a house in Bartley Green, because the new floors share one set of foundations and one roof.
Bartley Green: the key facts for this kind of project.
- Postcode districts
- B29, B30, B31, B32, B38 and B45
- County / area
- West Midlands, England
- Price region
- West Midlands
- Guide price
- £86,000–£115,500 (£2,050–£2,750 per m²)
- Approval route
- Planning permission is needed: in England, permitted development only allows single-storey extensions to the side.
- Nearest towns
- Halesowen (2.4 miles), Smethwick (4.2 miles), Oldbury (4.5 miles)
- Distance to Birmingham
- about 5.2 miles
- First visit
- Free, no obligation
About a two-storey side extension
A two-storey side extension is a new two-floor addition built into the space beside your house, often over a driveway or side passage. It typically adds one or two bedrooms upstairs and a utility, study or larger kitchen below, without giving up rear garden.
Bartley Green sits about 5.2 miles from Birmingham. Closer to home, Halesowen is 2.4 miles away and Smethwick 4.2 miles.
What it costs in Bartley Green
In the West Midlands, which includes Bartley Green, we'd expect a two-storey side extension to cost around £86,000–£115,500 for a 3 m × 7 m footprint on two floors (42 m² of new floor space), or £2,050–£2,750 per m² including VAT. We'll give you a written design-stage price first, then a fixed build price once the drawings are agreed.
| Spec | Per m² | A 3 m × 7 m footprint on two floors (42 m² of new floor space) |
|---|---|---|
| Essential | £1,890–£2,530 per m² | £79,000–£106,500 |
| Standard | £2,050–£2,750 per m² | £86,000–£115,500 |
| Premium | £2,460–£3,300 per m² | £103,500–£138,500 |
Planning and building regulations in Bartley Green
In England, a two-storey side extension always needs householder planning permission, because permitted development only allows single-storey extensions beyond a side wall. The fee is £548 (or £575 for applications made from 8 December 2026), and councils should decide within 8 weeks of validation. Expect them to look at set-back, roof height, gaps to the boundary and the effect on neighbours.
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 Bartley Green homes
Matching the ridge and roof
A hipped house usually needs a hipped extension roof, and a gabled house a gable. Matching the pitch, tiles, ridge detail and brick bond is what makes a side extension look original rather than added, and councils look closely at it on a front-facing addition.
Access and services
Side extensions often cover the only route to the back garden, a gas meter, soil pipes or a drain run. We plan bin and bike access, move meters and pipes where needed and check drains early, because these items affect both cost and layout.
How we'd run your project
Measure and listen
A visit to Bartley Green to understand how you live in the house now and what the extra rooms need to do, plus a first look at the structure.
Drawings, then consent
We draw the scheme, check it against the rules in England, and take it through the right consent with the council.
Engineer it
Foundations sized for two floors, steels for any openings, and building control approval, all before anyone starts on site.
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 two-storey side extensions in Bartley Green
How long does a two-storey side extension 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.
Which postcodes do you cover around Bartley Green?
We cover Bartley Green (B29, B30, B31, B32, B38 and B45) and nearby places including Halesowen, Smethwick and Oldbury, plus the rest of the West Midlands. The first site visit is free.
Do I need planning permission for a two-storey side extension in Bartley Green?
Bartley Green 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 much does a two-storey side extension cost in Bartley Green?
Our guide for the West Midlands, which covers Bartley Green, is £2,050–£2,750 per m² including VAT. A typical project with a 3 m × 7 m footprint on two floors (42 m² of new floor space) comes to about £86,000–£115,500. Design and approval fees are extra, and we fix the build price in writing once the design is agreed.
Can I build a two-storey side extension over my driveway?
Yes, if the drive is wide enough for a useful room and the council accepts the design. You may lose off-road parking, which some councils weigh up, and the foundations need to suit the ground below. We check parking, drains and meter positions at the free site visit before any drawings are prepared.
Nearby
Close to Bartley Green? We work across the area, including:
Other extensions in Bartley Green
- Rear
- Wraparound
- Part two-storey
- Over a garage
- First floor
- Semi-detached
- Detached
- Kitchen and bedrooms
- Bedroom and en-suite
All two-storey extension services in Bartley Green · Two-storey side extensions across the West Midlands
Want a figure first? Try our guide price tool, then book a free visit to firm it up.