Single-storey extensions in Castle Vale

Planning your single-storey extension in Castle Vale

In Castle Vale, Birmingham City Council decides planning questions. We check permitted development limits and any local restrictions at the survey, then deal with the Building Regulations side so you receive a completion certificate when the work is signed off.

Most of the build happens outside, so the kitchen is usually only out of action for one to three weeks near the end.
Foundations within 3 metres of a neighbour's house that go deeper than theirs need party wall notice at least a month in advance.
Wide glazed doors and roof lights make the biggest difference to how bright the new room feels, and to the final price.

Postcode district: B35
Planning and building control: Birmingham City Council
From our West Bromwich base: 9 miles

Options to consider in Castle Vale

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.

Wrap-around extension

Combines a side and rear extension into an L shape, giving the largest ground-floor gain. Because it extends both sideways and rearwards, a wrap-around normally needs a householder planning application rather than relying on permitted development. Expect more steelwork and a more involved roof where the two sections meet.

Guide prices for Castle Vale

Guide prices start at £28,000 and run to £90,000 depending on size and specification. A 4 m × 5 m rear extension on a semi, with roof lights and bifold doors: around £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. We confirm a fixed price for the agreed specification after visiting.

Questions about single-storey extensions in Castle Vale

How much does a single-storey extension cost in the West Midlands?

Most single-storey extensions in the West Midlands cost between £28,000 and £90,000, including VAT where it applies. A typical 4 m × 5 m rear kitchen-diner on a semi, with roof lights and bifold doors, usually costs £40,000–£52,000 built to a finish ready for decorating. Kitchen units, flooring and decorating are extra. After the free survey you get a fixed price for the agreed specification.

Which postcodes in Castle Vale do you work in?

We cover B35 and the streets around them. If you're on the edge of Castle Vale, neighbouring Castle Bromwich and Erdington are covered too.

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 Castle Vale?

Usually building control, and sometimes planning. Birmingham City Council is the planning authority for Castle Vale; 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

Other work we do in Castle Vale

Ready to see what fits? Send your postcode and a rough idea of the size, and we'll take it from there.