Single-storey extensions in Kings Norton

Planning your single-storey extension in Kings Norton

Planning applications and lawful development certificates for Kings Norton go to Birmingham City Council. Many single-storey extensions fall under permitted development, but not every house keeps those rights — conditions on newer estates, conservation areas and Article 4 directions can remove them. The structural work also needs Building Regulations approval, through the council's building control team or a registered building control approver.

Wide glazed doors and roof lights make the biggest difference to how bright the new room feels, and to the final price.
Detached houses get a little more room: 4 metres as standard, or up to 8 metres with prior approval.
A lawful development certificate from Birmingham City Council confirms in writing that a permitted development extension is lawful, which helps when you sell.

Postcode district: B38
Planning and building control: Birmingham City Council
From our West Bromwich base: 9 miles

Which options suit homes in Kings Norton?

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.

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.

What does your single-storey extension cost in Kings Norton?

Expect to budget between £28,000 and £90,000 depending on size and specification in Kings Norton. 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.

Your questions answered

How long does a single-storey extension take?

Allow 8–12 weeks on site for most single-storey extensions, plus time beforehand for drawings and approvals. If you need a planning application or a lawful development certificate, councils aim to decide within 8 weeks. Glazing and steel are ordered early so they arrive when the shell is ready, which keeps the build from stalling halfway.

How do I book a survey in Kings Norton?

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.

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.

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 Kings Norton; Building Regulations approval comes from its building control team or a registered building control approver. We'll tell you which applies after the survey.

Single-storey extensions near Kings Norton

Other work we do in Kings Norton

Get a guide price for your Kings Norton extension in a couple of minutes, then a fixed price for the agreed specification after the survey.