Single-storey extensions in Northfield

Single-storey extensions in Northfield: approvals and local details

Planning applications and lawful development certificates for Northfield 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.

Most of the build happens outside, so the kitchen is usually only out of action for one to three weeks near the end.
Detached houses get a little more room: 4 metres as standard, or up to 8 metres with prior approval.
If you're building over or near a public sewer, the sewerage company has to agree before the foundations go in.

Postcode district: B31
Planning and building control: Birmingham City Council
From our West Bromwich base: 7 miles

Choices to weigh up in Northfield

Side or side-return extension

Uses the strip of land beside the house, often a passage or driveway. Under permitted development a side extension can be up to half the width of the original house and no more than 4 metres high. On a terrace with a narrow side return, it can widen a galley kitchen considerably without eating into the garden.

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.

Single-storey extensions prices in Northfield

Expect to budget between £28,000 and £90,000 depending on size and specification in Northfield. 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. Your fixed price for the agreed specification follows a free survey at your Northfield address.

Single-storey extensions in Northfield: common questions

What guarantees come with the extension?

Windows, doors, roof lights and roofing membranes come with manufacturers' guarantees, and the terms for each product are set out in your quote. Building control's completion certificate confirms the work met Building Regulations when inspected. If anything in our workmanship isn't right after handover, call us and we'll come back and look at it. Ask us for current insurance details with your quote.

How do I book a survey in Northfield?

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.

What should I prepare before the survey?

Think about how you want to use the new space, and gather anything you have about the house: old plans, deeds showing boundaries, approvals for any earlier extension, and where you think the drains run. Photos of extensions you like help us price glazing and finishes accurately. If you're in a conservation area or on a newer estate, mention it, as it can affect permitted development.

Who approves single-storey extensions in Northfield?

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

Close to Northfield

Other home improvements in Northfield

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