Double-storey extensions in Perry Barr

Double-storey extensions in Perry Barr: approvals and local details

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

The householder planning fee in England is £548 from April 2026, paid to Birmingham City Council when you apply.
Councils often expect a side extension's first floor to be set back from the front wall, with its roof below the main ridge.
Party wall notices take one or two months to run, so they're best served as soon as planning is granted.

Postcode district: B42
Planning and building control: Birmingham City Council
From our West Bromwich base: 4 miles

Choices to weigh up in Perry Barr

Two-storey rear extension

Adds depth to both floors across the back of the house: a kitchen-diner below and a larger bedroom or new bathroom above. Permitted development only covers projections up to 3 metres and at least 7 metres from the rear boundary, so many rear builds still need planning. Overlooking and loss of light to neighbours are the usual tests.

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.

What does your two-storey extension cost in Perry Barr?

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. We confirm a fixed price for the agreed specification after visiting.

Your questions answered

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.

How do I book a survey in Perry Barr?

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 two-storey extension and arrange a time to visit.

How much does a double-storey extension cost?

In the West Midlands, most double-storey extensions cost between £52,000 and £135,000, including VAT where it applies. A typical side extension on a three-bed semi, around 32 m² across both floors, usually costs £68,000–£88,000 built to a plastered finish. Kitchen units, a bathroom suite, flooring and decorating are priced separately, so you can choose them to suit your budget.

Does Birmingham City Council need to approve my two-storey extension?

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

Double-storey extensions near Perry Barr

Other home improvements in Perry Barr

Let's talk about the space you need; a written, itemised quote for your Perry Barr home costs nothing and commits you to nothing.