Single-storey extensions in Bournville

Planning your single-storey extension in Bournville

Birmingham City Council is the planning authority for Bournville. If your plans need permission, apply early: householder applications have an eight-week target for a decision. Building Regulations approval and inspections run alongside the build.

A lawful development certificate from Birmingham City Council confirms in writing that a permitted development extension is lawful, which helps when you sell.
Under permitted development, a rear extension on a semi or terrace can usually project 3 metres from the original back wall, or 6 metres through the prior approval route.
Every extension needs Building Regulations approval, even when planning permission isn't required.

Postcode district: B30
Planning and building control: Birmingham City Council
From our West Bromwich base: 8 miles

Which option fits your home?

Flat roof or pitched roof

Flat roofs, usually GRP fibreglass or EPDM rubber, keep the height down near boundaries and suit roof lanterns. Pitched or lean-to roofs with tiles to match the house look more traditional and shed rain faster, but need more height. The choice affects permitted development limits, cost, and how much light reaches the existing rooms.

Rear kitchen-diner extension

The usual layout: a 3–6 metre extension across all or part of the back wall, with the old rear wall replaced by a steel beam so the new and existing rooms become one space. Roof lights or a lantern bring daylight into the middle of the house, and bifold or sliding doors open onto the garden.

How much should you budget in Bournville?

Expect to budget between £28,000 and £90,000 depending on size and specification in Bournville. A 4 m × 5 m rear extension on a semi, with roof lights and bifold doors: typically £40,000–£52,000.

Guide prices for single-storey extensions
Option	Guide price	Good to know
Small rear or side extension (10–15 m²)	£28,000 – £40,000	Utility, WC or a modest kitchen extension
Rear kitchen-diner extension (18–25 m²)	£38,000 – £58,000	The glazing spec moves it within the range
Wrap-around or large extension (30 m²+)	£58,000 – £90,000	More steel and roof, and normally a planning application

Guide ranges include VAT where it applies. Access, parking and the state of what's there now can move the price — the survey settles it.

Before you book in Bournville

Can we live at home during the build?

Yes, most families stay at home throughout. For the first several weeks the work is outside and your house is closed off from it. The disruptive part is the break-through, when the back wall comes out and the kitchen may be out of action for one to three weeks. We agree a plan for a temporary sink and cooking space before that stage starts.

How do I book a survey in Bournville?

Send the form on this page, use the guide-price tool or call 0800 088 6248 free. We'll ask a few questions about your single-storey extension and arrange a time to visit.

Do I need to tell my neighbours about an extension?

You don't need their permission for permitted development, but you will usually need to involve them. Under the prior approval route the council writes to adjoining neighbours and gives them 21 days to comment. If the build is on the boundary or the foundations are deep and close to their house, the Party Wall Act requires formal written notice. A friendly conversation before any notice arrives usually makes everything smoother.

Does Birmingham City Council need to approve my single-storey extension?

Usually building control, and sometimes planning. Birmingham City Council is the planning authority for Bournville; Building Regulations approval comes from its building control team or a registered building control approver. We'll tell you which applies after the survey.

Also covering nearby

More services in Bournville

Call 0800 088 6248 to talk through your extension, or send us a few details and we'll arrange a visit.