Double-storey extensions in Sedgley

Double-storey extensions in Sedgley: approvals and local details

Most two-storey extensions in Sedgley need a planning application to Dudley Council. A two-storey rear extension can sometimes be permitted development, but only if it is no more than 3 m deep and at least 7 m from the rear boundary, among other conditions. Building Regulations approval is needed either way.

New first-floor bedrooms normally need an escape window with at least 0.33 m² of clear openable area.
An upstairs en-suite is simplest when the new bathroom sits close to the existing soil stack.
The householder planning fee in England is £548 from April 2026, paid to Dudley Council when you apply.

Postcode district: DY3
Planning and building control: Dudley Council
From our West Bromwich base: 6 miles

Which option fits your home?

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.

Mixed-height extension

A two-storey section at the side with a single-storey section running across the back. This keeps the first floor away from neighbours' windows while still giving a wide kitchen-diner below. It's a practical compromise where planners have concerns about a full-depth two-storey rear extension, and it often simplifies the roof.

Double-storey extensions prices in Sedgley

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 Sedgley address.

Questions about double-storey extensions in Sedgley

How long does a double-storey extension take?

Plan on 14–22 weeks on site, depending on size and roof complexity. Before that, allow time for drawings, a planning decision (councils aim to decide householder applications within 8 weeks), Building Regulations drawings and party wall notices. It's worth starting the design well ahead of when you need the space, because the approvals stage can take as long as the build.

Which postcodes in Sedgley do you work in?

We cover DY3 and the streets around them. If you're on the edge of Sedgley, neighbouring Gornal and Coseley are covered too.

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.

Will I need permission from the council in Sedgley?

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

Double-storey extensions near Sedgley

Other home improvements in Sedgley

Call 0800 088 6248 or send us your postcode, and we'll arrange a time to look at the house.