Rear dormer drawings for Brunswick Town roofs — the box across the back slope that turns a low attic into a full-height room, drawn to Brighton & Hove City Council's guidance and the volume limits, delivered in days and revised free until your decision, with a free approval-odds check first.
Brighton & Hove City Council granted 89% of the householder planning decisions it made in its latest published year — 2 points above the 87% England-wide householder average. The set-piece Regency squares and their bow-fronted seafront terraces are protected against any alteration that breaks the historic building line, which is where a policy-literate drawing pack earns its keep. Its dominant Georgian (1714–1837) and Victorian (1837–1901) housing stock sets the design brief on most streets.
Before permission is required, Class B allows 40m³ of added loft volume on a terrace and 50m³ on a semi or detached house, and Class A allows a 3m single-storey rear extension on a terrace or 4m on a detached house. Brunswick Town carries at least one Article 4 direction, and conservation areas including Brunswick Town, Regency Square and Sackville Gardens remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Brunswick Town is determined against an 8-week statutory target.
Brunswick Square (Busby's monumental twin-terrace centrepiece off the seafront), Brunswick Terrace (the long bow-fronted seafront run either side of the square), Regency Square (the 1820s stucco square facing the West Pier site), Adelaide Crescent (the sweeping later-Regency crescent toward Hove), Sackville Gardens (smaller-scale piecemeal Victorian streets to the north-west) and Waterloo Street (the compact Regency lanes linking the estate inland) — these are the Brunswick Town pockets our drawings cover most. Heritage designations here include Brunswick Town, Regency Square and Sackville Gardens. Brighton & Hove City Council weighs each proposal against Brighton & Hove City Plan (Parts One 2016 and Two 2022) and the relevant SPDs, where the density of Grade I and Grade II* listing means external works are judged against the original architectural composition. Almost all of Brunswick Town's terraces are now flats and maisonettes, which hold no householder permitted-development rights of their own.. On roofs the borough is parapet-hidden flat and leaded roofs on the Regency terraces and shallow slated roofs behind the cornice lines, over Grade I and Grade II* Regency stucco terraces and squares, bow-fronted seafront houses and converted flats and maisonettes.
The box dormer is the workhorse loft, and most of Brunswick Town is built for it — the borough runs to Grade I and Grade II* Regency stucco terraces and squares, bow-fronted seafront houses and converted flats and maisonettes under parapet-hidden flat and leaded roofs on the Regency terraces and shallow slated roofs behind the cornice lines, and a flat-roofed box across the rear slope is the cheapest cubic metre of full-height space those roofs give up. Brighton & Hove City Council tests the dormer against Brighton & Hove City Plan (Parts One 2016 and Two 2022) and the relevant SPDs, and because permitted development turns on a number, the volume you propose against the volume you have left is the first thing an officer or a certificate checks.
That is why the arithmetic goes on the drawings. We calculate the box against the 40- or 50-cubic-metre allowance, count any earlier roof enlargement into the total, hold the flat roof below the ridge and set the face back off the eaves so the dormer reads as subordinate. The set-piece Regency squares and their bow-fronted seafront terraces are protected against any alteration that breaks the historic building line, so the cheeks, the window line and the material are drawn to answer it rather than invite a query.
Where Brunswick Town's streets are protected — Brunswick Town, Regency Square and Sackville Gardens among them — the Class B dormer right is switched off and even a modest rear box needs consent. Brunswick Town is covered by the city-wide small-HMO Article 4 direction and by a conservation-area Article 4 that removes permitted-development rights on its Regency terraces, so even minor external changes to the stucco frontages require consent. We confirm the designation before the box is sized.
Many rear dormers in Brunswick Town are permitted development, but the volume and position decide it. You will normally need a full application to Brighton & Hove City Council if any of these apply:
We draw the box within its volume allowance, the flat roof below the ridge and the face set back off the eaves — the three things a dormer stands or falls on — and submit a validation-complete pack, whether that is a lawful development certificate or a full householder application.
Below is Brighton & Hove City Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. The council approves most householder applications city-wide, but in Brunswick Town the concentration of high-grade listed Regency stock means heritage impact governs what any scheme can achieve. A dormer is decided on volume and set-back, so a pack that shows the calculation and the eaves detail is cleared faster and refused less often than a DIY submission.
Source: MHCLG planning application statistics (householder decisions, England, 1 April 2025 - 31 March 2026). Compare every borough on our London approval-rate league table.
Tell us about your project and get a fixed, no-obligation quote back within one working day. If you don't need planning permission at all, we'll tell you that too — for free.
Across Brunswick Square, Brunswick Terrace and Regency Square, the dormer that goes through is the subordinate rear box: flat roof kept low, cheeks clad to recede, side windows obscure-glazed against overlooking, and the whole thing set back so the original eaves line still reads from the garden. On parapet-hidden flat and leaded roofs on the Regency terraces, this returns a full-height double and en-suite from what was standing-room-only, usually inside the permitted-development volume.
The density of Grade I and Grade II* listing means external works are judged against the original architectural composition. We keep the box off the ridge, match the cheek material to the roof, and where the volume is already spent — or the street is designated — draw the dormer as a householder application composed to Brighton & Hove City Council's roof-alteration guidance rather than push a certificate that would be refused.
We draw rear dormers on the terraced and semi-detached streets across the borough. A few of the neighbourhoods where Brunswick Town dormers come up most often:
Dormer loft drawings for Brunswick Square's Busby's monumental twin-terrace centrepiece off the seafront — volume-checked, set-back-detailed and drawn to Brighton & Hove City Council's guidance.
Dormer loft drawings for Brunswick Terrace's the long bow-fronted seafront run either side of the square — volume-checked, set-back-detailed and drawn to Brighton & Hove City Council's guidance.
Dormer loft drawings for Regency Square's the 1820s stucco square facing the West Pier site — volume-checked, set-back-detailed and drawn to Brighton & Hove City Council's guidance.
Dormer loft drawings for Adelaide Crescent's the sweeping later-Regency crescent toward Hove — volume-checked, set-back-detailed and drawn to Brighton & Hove City Council's guidance.
Dormer loft drawings for Sackville Gardens's smaller-scale piecemeal Victorian streets to the north-west — volume-checked, set-back-detailed and drawn to Brighton & Hove City Council's guidance.
Dormer loft drawings for Waterloo Street's the compact Regency lanes linking the estate inland — volume-checked, set-back-detailed and drawn to Brighton & Hove City Council's guidance.
Whether a dormer in Brunswick Town needs permission comes down to where it sits and how big the box is. This is how the cases compare.
| Dormer type | Permitted development? | What it gains | What Brighton & Hove City Council checks |
|---|---|---|---|
| Rear box, within volume | Usually yes | Full-height room across the back | Volume total, 20cm eaves set-back |
| Rear box, over volume limit | No — full application | A larger room | How far over the allowance, bulk |
| Front or side dormer | No — full application | Light to the front rooms | Visibility from the street, character |
| Dormer in a conservation area | No — full application | Same space, extra scrutiny | Roof form and street appearance |
In conservation areas such as Brunswick Town and Regency Square, Class B dormer rights are removed and every dormer needs a full application.
A fixed process built around how Brighton & Hove City Council validates and decides dormer applications — most drawings are submission-ready within seven days of survey.
Send us your Brunswick Town postcode and roof type. We confirm your conservation and Article 4 status, work out how much permitted-development volume you have left, and score your odds against live Brighton & Hove City Council decisions.
We measure ridge and eaves heights, roof pitch and the existing loft floor — the numbers the volume calculation, the set-back and the head heights depend on.
Chartered designers develop the box to your brief, drawn inside the Class B volume limits or, where those are exhausted or removed, to Brighton & Hove City Council's roof-alteration guidance.
We submit the certificate or application, manage validation and case-officer queries, and revise the drawings free until Brighton & Hove City Council issues its decision.
Often not. A rear box dormer within 40 cubic metres on a terrace, or 50 on a semi or detached house, set back at least 20 centimetres from the eaves and kept below the ridge, is usually permitted development. In Brunswick Town you will need a full application to Brighton & Hove City Council for a front or side dormer, a box that exceeds the volume, and any dormer in a conservation area such as Brunswick Town and Regency Square, where those rights are removed.
The permitted-development limit is a volume, not a footprint: 40 cubic metres of added roof space on a terraced house and 50 on a semi-detached or detached one, and any earlier loft enlargement counts against that total. In Brunswick Town the box must also sit below the ridge and back from the eaves. We measure your roof and calculate the exact volume you have left before drawing. Brighton & Hove City Council is the decision-maker.
Not under permitted development. A dormer on the front roof slope, or one facing a highway, always needs a full application to Brighton & Hove City Council, because it changes how the house reads from the street. Rear box dormers are far more likely to be approved — or to be permitted development outright — which is why almost every Brunswick Town dormer we draw sits on the back slope.
Often, on a terrace or semi. If the dormer or the loft steelwork meets the party wall with your neighbour, the Party Wall etc. Act applies and notice must be served before work starts — separately from Brighton & Hove City Council's planning decision. We flag the party-wall junction on the drawings so a surveyor can be appointed early and the build is not held up. This applies to your Brunswick Town address specifically.
If your dormer is permitted development, a lawful development certificate from Brighton & Hove City Council is council-stamped proof of it — worth holding, because a buyer's solicitor will ask for it when you sell. We prepare and submit the certificate with the same measured drawing pack that shows the box within its volume allowance. This applies to your Brunswick Town address specifically.
We price each Brunswick Town dormer individually, because the roof pitch and the volume left vary house to house, and send a fixed, no-obligation quote within one working day. It covers the full drawing pack with free revisions until Brighton & Hove City Council approves, and we confirm at the outset whether your box is permitted development or needs an application. Call 020 7864 7245 to start.
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