A city of semis that is short of bedrooms
Birmingham is semi-detached country. The 2021 Census put 35.6% of the city's households in semis and another 27.8% in terraces, with only about one in nine in a detached house. It also found that 9.4% of households had fewer bedrooms than they needed. That was the highest rate of any of the Core Cities.
Most of those semis are older than they look. Birmingham Corporation was building council estates on a huge scale between the wars. Kingstanding was farmland until 1928 and had some 6,700 homes by the time it was finished, then the largest council development in Europe. Further in, the Victorian and Edwardian streets are red brick. Moseley's 1890s terraces on Aldwyn Avenue and Farquhar Road have slate roofs, while its Arts and Crafts houses have steep gables and clay tiles. At the other end of the timeline, Langley in Sutton Coldfield is set to add 5,500 homes. Houses built in recent decades usually have trussed roofs, and converting one means taking the trusses out and putting steel in.
Which conversion suits which Birmingham house
A quick guide to how each type tends to work on the houses here. Every one links to a fuller guide.
Hip to gable. With more than a third of the city living in semis, any local loft firm worth calling will have built plenty. Build the hipped end up into a gable and you gain the headroom to put the staircase over the existing one.
Read our full guide: Hip-to-Gable Loft Conversions: What It Involves and Which Houses It Suits →
Rear dormer. Usually paired with a hip to gable on a semi, or used alone on a terrace. Outside a conservation area it normally goes through as permitted development. Inside one of Birmingham's 29, it never does.
L-shaped dormer. For a Victorian terrace with a back addition, giving a second room over the outrigger. If your terrace is in Selly Park Avenues or Moseley, both conservation areas, plan on a full application.
Rooflights only. The gentle option, and often the only one in St Agnes, where the council's appraisal notes that most houses were built with habitable attics. Even rooflights need permission in parts of Moseley, Moor Pool and Selly Park Avenues, so check first.
Mansard. Rare on a Birmingham semi, and it needs planning permission wherever you live. It makes more sense on a flat-fronted Victorian terrace than on a 1930s house with a hipped roof.
Extra bedroom. The reason most people here convert. A fire-protected route down the stairs and mains-wired smoke alarms are what the building control inspector will check before signing it off.
En-suite. Decide on it before the drawings are done. On a semi, the shower room usually goes in the dormer over the existing bathroom, where the soil pipe already runs.
Home office. Nearly half of Birmingham households live in three-bedroom homes, and the box room rarely works as an office. A loft room away from the rest of the house does, especially if it can take a sofa bed for visitors.
Read our full guide: Loft Home-Office Conversion: What Works Well Up There and What to Specify →
Planning. Away from the conservation areas, a dormer within 40 cubic metres on a terrace, or 50 on a semi, can usually go ahead as permitted development. Inside them, any dormer needs an application. On the Calthorpe Estate you also need the estate's consent.
Cost. No price here, on purpose. A hip to gable in Erdington and a conservation-grade dormer in Harborne are different jobs, and a figure on a web page would only mislead you. Get three firms to look at your roof.
Edgbaston and Bournville answer to an estate as well as the council
Two parts of the city have a landlord's say over the roof on top of the planning system. The Calthorpe Estate covers about 640 hectares of Edgbaston under a scheme of management made under the Leasehold Reform Act 1967. Freeholders can't opt out of it. The residents' handbook is blunt: consent under the scheme is needed to convert a loft or to fit dormer or Velux windows. Much of the estate is also in the Edgbaston or Barnsley Road conservation areas, so expect to apply twice.
Bournville is the other one. The Bournville Village Trust has held a certificate of management under the same Act, and it has always kept a close eye on how extensions look. Bournville Village is also a conservation area with an Article 4 direction. Speak to the Trust before you pay anyone to draw.
Streets where the council controls the roof
Eleven of the city's conservation areas have Article 4 directions on top. Some are tight. In Moor Pool, the Harborne estate John Sutton Nettlefold started in 1907, any change to a roof seen from the road, the bowling green or the pool needs permission, down to new tiles or a single rooflight. Selly Park Avenues, a run of red brick terraces built between 1905 and 1908, has the same rule for roofs facing the street.
Moseley's direction dates from May 2005 and covers Amesbury Road, Chantry Road, Church Avenue, Park Hill and Salisbury Road. The council's guide says new dormers will only be accepted where the original house had them. St Agnes has had a direction over every house since 2009. Its appraisal says front attic windows shouldn't be enlarged, and rooflights belong on the rear slope.
Look your address up on Planning Online before anything else. It shows planning history back to 1948, so you can see what your neighbours were allowed. Building regulations are handled for the council by Acivico, whose building consultancy team takes enquiries at building.consultancy@acivico.co.uk. Keep the completion certificate when the job is signed off. A buyer's solicitor will want it.
Where these facts come from
- Birmingham City Council: conservation areas
- Birmingham City Council: Article 4 directions in conservation areas
- Birmingham City Council: Moseley Article 4(2) advice guide
- Birmingham City Council: St Agnes conservation area appraisal (2022)
- Birmingham City Council: Moor Pool newsletter (Article 4)
- Birmingham City Council: Selly Park Avenues newsletter (Article 4)
- Birmingham City Council: city-wide HMO Article 4 direction
- Birmingham City Council: Census 2021 housing briefing
- Birmingham City Council: building consultancy (Acivico)
- Calthorpe Residents' Society: residents' handbook
- Planning Portal: loft conversions and permitted development
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Questions people in Birmingham ask
I live on the Calthorpe Estate. Is planning permission enough for a dormer?
No. The estate's scheme of management needs its own consent for any loft conversion and for dormer or Velux windows, and you can't opt out. If your house is in the Edgbaston conservation area too, any dormer needs a planning application as well. Get both approvals before work starts.
Can I convert the loft in Selly Oak and let the rooms to students?
Not without planning permission for the change of use. Since 8 June 2020 a city-wide Article 4 direction has meant turning a family house into a small HMO for three to six people needs an application. It replaced the older direction that only covered Selly Oak, Harborne and Edgbaston.
My house in St Agnes already has rooms in the attic. Can I make them bigger?
Usually inside the roof, rarely outside it. The whole conservation area is under an Article 4 direction, and the council's appraisal says the street-facing attic windows shouldn't be enlarged. Rooflights at the back, kept to a minimum, stand a better chance.
Who signs off the building regulations for a loft in Birmingham?
Unless your builder uses a private building control company, it's the council's building control service, provided by Acivico. They inspect at stages and issue a completion certificate at the end. File it with your deeds.