Half the city lives in a flat
Start with the building, not the roof. At the 2021 Census half of all households in Brighton & Hove lived in a flat, and almost one in five lived in part of a converted or shared house. That is the tall Victorian terrace split into three or four, with a top-floor flat sitting right under the slates.
If that's you, the national permitted development rules for lofts don't apply at all. They cover houses only. A top-flat loft needs a full planning application, however small the dormer. Houses get an allowance of 40 cubic metres for a terrace and 50 for a semi or detached, but only outside conservation areas and the South Downs National Park.
Parapets, butterfly roofs and Welsh slate
The age of the street tells you most of what a surveyor will find. Many Regency terraces have a valley roof hidden behind a front parapet, shaped like a V at the back. Those are hard to convert well. Council officers have recommended refusing a scheme to swap one of these butterfly roofs for a flat-roofed sun room, citing the council's own rule that a main pitched roof must not be removed to make a flat one.
The Victorian and Edwardian suburbs are friendlier. Round Hill went up from 1865, mostly in the 1880s, on a slope that drops towards the railway. Preston Park grew from the Clermont estate of 1866 and the Stanford estate, which ran on to about 1900. These houses were built with Welsh slate brought in by rail, and clay tiles took over after 1900. Much of the slate has since gone. In Round Hill most roofs are now concrete tile.
Further out, the interwar city doubled in size. Moulsecoomb was begun in the 1920s as a council garden suburb of plain two-storey houses with pitched roofs. Patcham, Woodingdean and Saltdean sit on the downland fringe. Those are the semis where a hip-to-gable job makes the most sense.
Fitting the job to your house
Here's how each type tends to play out across the city's housing. Every one links to a fuller guide.
Planning first. In Brighton this comes before design. Is it a house or a flat? Is the street in a conservation area or the national park? Is there an Article 4 direction? A yes to any of those can turn a permitted job into an application.
Rear dormer. Suits terraces and semis outside the conservation areas. Inside Round Hill or Preston Park it needs an application, and both character statements criticise dormers that dominate the roof. The council's design guide wants it set in from the sides, down from the ridge and up from the eaves, so it doesn't read as an extra storey.
Rooflights only. Often the only realistic option in a conservation area. On a single house in Round Hill or West Hill you can still put rooflights on the back slope without permission. On a front slope, or anywhere in a conservation area, the council expects flush conservation rooflights and as few of them as possible.
Hip to gable. The obvious route for a suburban semi in Woodingdean, Moulsecoomb or Patcham (outside its conservation area). The design guide warns against unbalancing a semi-detached pair, so if next door hasn't done theirs, expect the planners to look closely.
Read our full guide: Hip-to-Gable Loft Conversions: What It Involves and Which Houses It Suits →
L-shaped dormer. Works on terraces with a back addition. Outside a conservation area it can fall within permitted development, as long as the volume stays inside 40 cubic metres.
Mansard. Always an application. In a conservation area the council's line is that the main roof's form and ridge height stay as they are, so a mansard on a historic terrace is a long shot. I wouldn't pay for drawings without pre-application advice.
Extra bedroom. What most families here want. If the plan is to let rooms to students or sharers, check the city's Article 4 direction on small houses in multiple occupation before you build.
Home office. A good use for a smaller terrace loft that would make a tight bedroom. A desk needs less headroom than a bed and a wardrobe.
Read our full guide: Loft Home-Office Conversion: What Works Well Up There and What to Specify →
En-suite. Plan the soil pipe route early. In a converted house you're working above someone else's flat, so settle the route before anything is ordered.
Cost. No figure here. A slate terrace in a conservation area and a 1930s semi in Patcham are different jobs with different bills. Get three firms round.
Article 4 streets and the national park edge
Brighton & Hove has more than 30 conservation areas, and in all of them a dormer needs planning permission. On top of that, several have Article 4 directions. In Round Hill and West Hill they cover house fronts that face a road or open space, so changing the roof covering or chimneys, or adding a rooflight, on that side needs consent. The Avenues direction in Hove goes further. It applies to all property there, covers altering the roof, and expects natural slate wherever slate already exists. Brunswick has a similar one. Patcham's covers roof alterations including rooflights, chimneys and solar panels.
Part of the city sits inside the South Downs National Park. There the national park authority, not the city council, decides planning applications.
Building regulations go to the council's Building Control team at Hove Town Hall, unless your builder uses a private approver. Inspections can be booked through the council's app. Search your street on the Planning Register first and see what the neighbours got away with.
Where these facts come from
- Brighton & Hove City Council: Census 2021 city profile
- Planning Portal: loft conversion permitted development
- Brighton & Hove City Council: Article 4 directions
- Article 4 direction: Round Hill
- Article 4 direction: The Avenues
- Article 4 direction: Patcham
- Round Hill conservation area character statement
- Preston Park conservation area character statement
- Design Guide for Extensions and Alterations SPD12
- Brighton & Hove Urban Characterisation Study
- Brighton & Hove City Council: Stanmer and the South Downs National Park
- Brighton & Hove City Council: contact building control
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Questions people in Brighton ask
I own the top-floor flat in a converted house. Can I go into the loft?
Possibly, but not without planning permission. Flats have no permitted development rights for roof extensions, so even a rooflight-only scheme on the outside of the building needs looking at. You'll also need to know who owns the roof space.
My Regency house has a parapet and a V-shaped roof. Can it be converted?
It's difficult. Most of these sit in conservation areas, where the council wants the original roof form kept. Schemes that remove a butterfly roof have been recommended for refusal. My expectation would be rooflights rather than any change to the roof shape.
I live on The Avenues in Hove. Do I need permission for new roof tiles?
Yes. The Article 4 direction there covers changing the type of roof covering, and the council expects natural slate where slate is already on the roof. Coloured or corrugated concrete tiles aren't acceptable.
I live up by Stanmer. Is planning still the city council?
No. The Stanmer conservation area is wholly inside the South Downs National Park, so planning goes to the national park authority. Building regulations still go to building control as normal. Check the boundary for your own address before you apply.