Double-storey extensions in Walsall

Before your two-storey extension in Walsall

Expect to apply to Walsall Council for planning permission for a two-storey extension in Walsall; side extensions over one storey always need it. We prepare the drawings, and the structural work also needs Building Regulations approval.

An upstairs en-suite is simplest when the new bathroom sits close to the existing soil stack.
New first-floor bedrooms normally need an escape window with at least 0.33 m² of clear openable area.
Scaffolding is usually up for most of the build, so think about access along the side of the house early.

Postcode districts: WS1, WS2, WS5
Planning and building control: Walsall Council
From our West Bromwich base: About 5 miles to the centre

Options to consider in Walsall

Two-storey side extension

Built over the side of the house, often where a driveway or old garage sits. It can create a garage, utility or study downstairs with a double bedroom above. Councils often expect the upper floor to be set back from the front and the roof to sit lower than the main ridge, so the design needs care to win approval.

Building over an existing extension

Adds a first floor on top of an existing single-storey extension or attached garage. It can cost less because the footprint already exists, but a structural engineer must check the existing foundations and walls first, and they sometimes need strengthening. The old flat roof comes off and the new floor is tied into the main house.

Double-storey extensions prices in Walsall

Guide prices start at £52,000 and run to £135,000 depending on size and specification. A two-storey side extension on a three-bed semi, about 32 m² over two floors: around £68,000–£88,000.

Guide prices for double-storey extensions
Option	Guide price	Good to know
Compact two-storey rear (20–28 m² total)	£52,000 – £72,000	Bigger kitchen below, bedroom or bathroom above
Two-storey side or rear (30–40 m² total)	£68,000 – £98,000	The usual size on a three-bed semi
Large or combined side and rear (45 m²+)	£95,000 – £135,000	More steel, a complex roof and a longer programme

Guide ranges include VAT where it applies. Your fixed price for the agreed specification follows a free survey at your Walsall address.

Double-storey extensions in Walsall: common questions

What will the council look at when deciding planning?

Councils judge two-storey extensions mainly on their effect on neighbours and the street. They look at loss of light and outlook next door, overlooking from upstairs windows, and whether the extension sits comfortably with the house, often expecting side extensions to be set back and lower than the main roof. Many councils publish householder design guides, and following yours closely improves the chance of approval.

Do you cover the whole of Walsall?

Yes — we cover Walsall from our West Bromwich base, including Sandwell, Staffordshire and Dudley. Call 0800 088 6248 or send the form on this page to book a free survey.

Can we stay in the house while you build?

Most families do. The early stages are outside, and the existing house stays closed off until the shell is weathertight. The harder weeks are when openings are cut through on both floors, which brings dust and noise into bedrooms and the kitchen. We sheet off openings, lock up securely every night and agree in advance which rooms you'll lose and when.

Who approves double-storey extensions in Walsall?

Usually both. Most two-storey extensions need a planning application to Walsall Council, and the structural work needs Building Regulations approval from its building control team or a registered building control approver.

Double-storey extensions across Walsall

Choose your town for local details and postcodes:

Double-storey extensions near Walsall

Other work we do in Walsall

Want a guide figure first? Use our quote tool for your Walsall extension, then book a survey for a fixed price for the agreed specification.