Bedroom extensions for homes in Smethwick
Thinking about a bedroom extension for your Smethwick home? Start with a free site visit: we measure up, check what the council will allow and give you honest guide figures on the day.
- Guide price in SmethwickFrom £25,000 inc VAT
- PlanningUsually a householder application
- Build time14–22 weeks on site
- Postcode districtsB16, B18, B21, B66, B67
What should I budget for a bedroom extension in Smethwick?
These guide figures apply our West Midlands adjustment (×0.97) to national rates. They include VAT at 20% and cover the build itself; design and council fees are listed separately.
Typical rates in Smethwick: £1,550 to £3,100 per m² including VAT, depending on specification.
| Size | Essential | Standard | Premium |
|---|---|---|---|
| One bedroom 12 m² | £25,000 – £31,000 | £25,000 – £33,000 | £27,500 – £37,500 |
| Bedroom and en-suite 18 m² | £27,500 – £34,500 | £33,000 – £43,000 | £41,500 – £56,000 |
| Two rooms 30 m² | £46,500 – £57,000 | £55,000 – £71,500 | £69,500 – £93,500 |
Try the guide-price tool to see a range for your own size and finish.
What we take care of
- Fire safety: escape windows and smoke alarms to building regulations
- En-suite drainage and ventilation design
- Layout options: two-storey, over-garage or ground floor
- Structure, roof, insulation and finish
Covering Smethwick
Postcode districts we cover around Smethwick include B16, B18, B21, B66, B67, B68. Nearby, we also take on projects in West Bromwich (2 miles), Birmingham (3 miles), Halesowen (5 miles), Wednesbury (5 miles).
For homes towards Worcestershire, Bromsgrove is around 12 miles away. The West Midlands has a large stock of 1930s and post-war semi-detached houses, which are well suited to rear, side and over-garage extensions, plus Victorian terraces in the older inner areas.
Planning rules that apply in Smethwick
In England a two-storey rear extension is permitted development only if it projects no more than 3 m from the original rear wall, sits at least 7 m from the rear boundary, matches the roof pitch and uses obscure, non-opening side windows upstairs. Most two-storey extensions therefore go through a householder planning application, which costs £548 from 1 April 2026 and normally takes about 8 weeks.
Before any drawing is finalised we check whether the house is listed, in a conservation area or subject to an Article 4 direction.
If the work involves a shared wall, building on the boundary, or digging foundations within 3 m (sometimes 6 m) of a neighbour's building, the Party Wall etc. Act 1996 applies and notice must be served before work starts: two months for work to a party wall, one month for new walls on the boundary and for excavations.
Building regulations approval is separate from planning. In England you can use the council's building control team or a registered building control approver; a full plans application gets the drawings checked before work starts, and the inspector signs the work off with a completion certificate.
Applications are decided by the local planning authority (your district, borough or unitary council).
From first visit to completion
Site visits are free and there is no obligation. Where drawings are needed, the design stage is priced in writing before it starts.
Free site visit
First, a site visit: we look at the house, garden, access and drains and listen to what you need.
Design and approvals
We draw the design, agree it with you and handle planning or permitted development checks and building regulations.
Fixed written price
The price is fixed in writing once the design is settled, with a clear programme and payment stages.
Build and sign-off
Work is carried out to the agreed programme, inspected by building control and signed off at the end.
Your questions about a bedroom extension in Smethwick
Can I see a price before committing to anything?
Yes. The guide prices on this page are adjusted for Smethwick, and the guide-price tool gives a range for your own size. After the survey you get a written price before anything is agreed.
Do I need building regulations approval in Smethwick?
Yes. Almost every extension needs it, whatever the planning route. We prepare the drawings and book the inspections.
How long does a bedroom extension take to build in Smethwick?
On site, typically 14 to 22 weeks once approvals are in place. Before that, allow 8–14 weeks design and approvals.
Does an en-suite need a window?
No, but it needs mechanical extraction that meets the building regulations. We design the duct route at the drawing stage.
Will a new bedroom need planning permission?
Upstairs additions usually do. Ground-floor rooms may fall within permitted development, depending on size and position.
Book a free site visit in Smethwick
We will measure up, check the planning position and give you honest guide figures.
- Free, no-obligation site visit
- Planning route checked before you spend on drawings
- Written price once the design is agreed
- Building control sign-off at the end
Prefer to talk? Call 0800 088 6341 or .
Book a free site visit
Tell us a little about the project and we will arrange a time.