Single-storey extensions in Smethwick

Planning your single-storey extension in Smethwick

Sandwell Council is the planning authority for Smethwick. 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.

Detached houses get a little more room: 4 metres as standard, or up to 8 metres with prior approval.
A lawful development certificate from Sandwell Council confirms in writing that a permitted development extension is lawful, which helps when you sell.
Most of the build happens outside, so the kitchen is usually only out of action for one to three weeks near the end.

Postcode district: B66
Planning and building control: Sandwell Council
From our West Bromwich base: 2 miles

Which options suit homes in Smethwick?

Utility, WC or boot-room extension

A smaller extension of 6–12 m² can take the washing machine, coats and a downstairs toilet out of the kitchen. Adding a WC means a new waste connection, so the position of the existing drains often decides the layout. It's a cost-effective way to free up the main rooms without a large build.

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.

How much should you budget in Smethwick?

Expect to budget between £28,000 and £90,000 depending on size and specification in Smethwick. 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. A free survey turns this guide into a fixed, itemised price.

Questions about single-storey extensions in Smethwick

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.

How do I book a survey in Smethwick?

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.

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.

Who approves single-storey extensions in Smethwick?

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

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