Loft conversion architects in Brighton and Hove

Can you convert a loft in Brighton without planning permission?

Sometimes, but not on every Brighton street. Permitted development covers some loft work to a single house, yet it is not available to flats or in conservation areas, a listed house needs listed building consent for the work anyway, and an Article 4 direction can remove further rights. The council's own guide says permitted development rights usually do not apply to flats or listed buildings and are affected inside a conservation area or an Article 4 area (SPD 12). With 34 conservation areas named on the council's page (conservation areas), plenty of Brighton and Hove lofts start from a planning application, not a certificate.

Even where permitted development applies, the council says formal confirmation comes only from a certificate of lawful development, and that you can apply for one if you need to prove to a buyer that finished work is lawful (when you need planning permission). Our national loft conversion page and the loft rules post cover the general limits.

What does SPD 12 say about dormers?

The guide's roof alterations section says the rhythm and continuity of rooflines is often a key visible element in the streetscene, so excessively bulky additions can harm both a house and its street. Its rules for the common cases are concrete:

• Rear dormers should be a clear subordinate addition, set in from the side, down from the ridge and up from the eaves so they do not look top heavy.
• They should not appear above the ridge line, should be well proportioned to the roof space, and, where there are two or more, evenly aligned and spaced.
• Rear dormers should normally align with windows below, though the centre line of the building can be preferable.
• Front dormers have a greater impact: they are generally limited to a single dormer, set back from the eaves and down from the ridge, except where front dormers are common and the house can accommodate more.
• Where a terrace was built with dormers, the originals should not be removed or altered. Where most of an originally dormerless terrace now has them, a new one may be acceptable if its scale and position are sympathetic.

For semis and small terraces, the guide also says roof alterations should not unbalance the pair or group, though a well-designed alteration that restores symmetry may be acceptable. The practical lesson is to survey the street's roofline before you commission drawings.

How do conservation areas and Article 4 directions change a loft scheme?

For historic buildings, section 5 of the guide goes further. It says not every roof space suits extension, with shallow or limited pitches given as an example. The original form, shape and fabric of the main roof are not to be altered and its ridge height is not to be raised, with exceptions only where the roof is not visible and the wider area would not be harmed. Front dormers are not appropriate unless typical of the street, and inset dormers will usually be acceptable on rear slopes but only rarely at the front or sides. Dormers should have moulded eaves, cornices and timber fascias. Rooflights are usually acceptable on rear slopes, rarely at the front, and should be conservation rooflights that lie flat in the roof. Turning a pitched roof into a roof terrace is normally not acceptable.

The directions add consent requirements. The council's summaries for The Avenues, Brunswick and Pembroke & Princes list altering the roof and installing dormers as needing consent, say dormers are acceptable only in traditional designs where they already prevail, and note that flush rooflights are usually more acceptable but still need consent. They also say that removing chimney stacks or pots needs consent and will not usually be granted, which is relevant if a staircase or party wall stack is in the way (Pembroke & Princes, The Avenues, list of directions).

What does the loft application need to include?

The householder checklist lists, for a loft conversion, an application form, a CIL additional information form, a site location plan, existing and proposed floor plans and elevations and a biodiversity checklist. It asks for a design and access statement only in a conservation area where 100 square metres or more is created (householder checklist). The council lists roof alterations including dormers separately, with much the same documents but no CIL form.

The biodiversity item is the council's online wildlife assessment check, completed by the applicant or an architect, with no ecologist needed at first. The council's guidance names bats and birds as examples of species a check can flag, and says an application cannot be validated without the check. If the result calls for an ecologist, the council says the survey must be done before you submit, and some surveys can only be carried out at certain times of year (wildlife check). That timing matters for a programme that includes roof work.

Building regulations are separate from planning, and the council's fee table notes extra charges for buildings over 11 metres tall or work not built to common industry standards (building regulations fees). A registered building control approver is the private alternative; ask for their quote against the council's table. For a loft that touches a party wall, check the Party Wall etc. Act guidance before work starts.

Should you ask the council first?

The council's pre-application service lists loft conversions and extensions among the alterations it will advise on, and charges from £154.50 for a written reply, with a site meeting at £237.16 (pre-application service, household fees). In a conservation area, advice that includes heritage input is £408.54 for a written response, £752.18 with a virtual meeting and £860.15 with a site meeting (household pre-application advice). A conservation-area front dormer is the clearest case for spending that money; a plain rear dormer on a street that already has them is the opposite.

Householder decisions are quick in the city: 94.9% of 706 were granted in the year to June 2026 and, on our calculation from the same counts, 95.8% were decided within eight weeks or an agreed extension (MHCLG). Local background and planning basics are on the Brighton hub, and the application route is on Brighton planning applications.

What should you ask an architect about a Brighton loft?

1. Check the Architects Registration Board register at arb.org.uk before you instruct anyone.
2. Ask whether your street sits in a conservation area or Article 4 direction, and how that changes the dormer or rooflight design.
3. Ask them to show the dormer against SPD 12's set-in, set-down and set-up tests on the elevation.
4. Ask who completes the wildlife check and what happens to the programme if a bat survey is needed.
5. Get like-for-like written quotes that state whether building control is the council or an approver.