From £30k–£55k+
Rear Extensions in the West Midlands
Push out into the garden to open up the back of the house — often the simplest route to a much better ground floor.
Benefits
Why homeowners choose rear extensions
- Often achievable under permitted development
- Predictable build programme
- Big visual transformation of the ground floor
- Strong cost-to-benefit ratio
Who it suits
- Families with under-used rear gardens
- Semis with cramped kitchens
- Homes with awkward conservatories to replace
- Anyone wanting bifolds and rooflights
Cost guidance
What a rear extensions typically costs
Planning-stage range: from £30k to £55k+. What pushes a project up or down:
- Size and structural complexity
- Amount of glazing — sliders, bifolds, rooflights
- Kitchen specification and appliances
- Ground conditions and drainage
- Finish level — flooring, joinery, ironmongery
- Planning and design fees (separate from build cost)
Householder planning fees and professional design costs are separate from build cost. We make these visible from the start, not buried in the build.
Planning & regulations
Planning and building regs
Single-storey rear extensions may fall within permitted development depending on depth and height. Building regulations approval is always needed.
Useful reading:
Process
How a rear extensions project runs with us
1
Free initial chat
Postcode, brief and rough budget. We come back with a planning-stage estimate and next steps.
2
Survey and concept design
On-site measure, brief workshop and concept tied to the budget.
3
Planning and building regs
Applications, structural calcs and building control sign-off coordinated end-to-end.
4
Build
One site team, weekly updates, kitchen and glazing coordinated for you.
5
Handover and aftercare
Snagging, certificates and a workmanship warranty issued at completion.
Recent work
Featured rear extensions projects
FAQs
Frequently asked questions
How much does a rear extensions cost?
Indicative planning-stage range: from £30k to £55k+. Final pricing depends on size, structure, glazing, kitchen spec, ground conditions, drainage and finishes. Full cost guide.
Do I need planning permission for a rear extensions?
Single-storey rear extensions may fall within permitted development depending on depth and height. Building regulations approval is always needed. Read the planning guide.
How long does a rear extensions take?
Most single-storey projects take 10–14 weeks on site. Double-storey and wrap-around projects typically take 16–22 weeks. Planning and design lead in usually adds 8–14 weeks.
Will you handle planning and building regs?
Yes — applications, structural calcs and building control sign-off are coordinated as part of our design-to-build process.
Do you cover my area?
We work across the West Midlands including Birmingham, Solihull, Wolverhampton, Dudley, Walsall and Coventry.
Next step
Get a planning-stage estimate
Tell us about the project. We will come back with realistic budget guidance and likely process — no hard sell.