Dormer in Birmingham: Planning Permission Guide
A guide to dormer extensions in Birmingham — PD rules, costs, and what you need to know.
Birmingham is England's largest local planning authority. The city has 29 conservation areas — including the Jewellery Quarter, Edgbaston (Calthorpe Estate), Moseley, and the city-centre Colmore Row & Environs — and around 1,495 listed buildings. Article 4 Directions remove permitted-development rights in several areas (13 direction records), so confirm whether your street is affected before relying on PD. Tree Preservation Orders are extensive across the suburbs (1,400+ protected zones). Green Belt is confined to the outer fringe, notably around Sutton Coldfield. The city is not within any AONB, National Park or World Heritage Site.
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Additions etc to the roof of a dwellinghouse
GPDO 2015, Schedule 2, Part 1, Class B
Dormers are covered by Part 1, Class B of the GPDO alongside other roof additions. They're subject to volume limits and restrictions on which roof slopes they can face.
Key dimension limits
These are the maximum GPDO limits for a detached house with no constraints. Your actual limits depend on your property type, location, and any planning restrictions.
Enter your postcode to see the personalised limits for your dormer.
Check my limitsWhich Professionals Do You Need?
Dormer construction involves significant structural work to your roof, so professional design and engineering input is recommended.
You'll need a structural engineer and a party wall surveyor for this project.
Loft conversions involve structural alterations and Building Regulations requirements that benefit from professional design.
Typical fee: £2,000–£5,000 (Plans + Building Regs)
Loft conversions require structural calculations for floor strengthening, roof alterations, and any steelwork.
Typical fee: £800–£2,500
Your semi-detached house shares a boundary with neighbours. Extensions and loft work within 3 metres of a shared wall trigger the Party Wall Act.
Typical fee: £700–£1,500 (per neighbour)
This guidance is based on a typical semi-detached house with no special constraints. Listed buildings, conservation areas, and attached properties may require additional professional input.
Find out exactly which professionals you need for your dormer.
Get personalised guidanceConservation Areas & Listed Buildings
In conservation areas, dormers facing a highway are not permitted development. Rear dormers may still be possible if they meet the volume limits.
Properties in conservation areas often have reduced permitted development rights. Some project types (like side extensions) lose PD rights entirely. An Article 4 Direction can remove additional PD rights.
Listed buildings (Grade I, II*, or II) have no permitted development rights at all. Any external alteration requires Listed Building Consent in addition to any planning permission. An architect experienced in heritage work is essential.
Check if your property is in a conservation area or has other planning constraints.
Check my propertyFrequently Asked Questions
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