Dormer, hip-to-gable and mansard loft conversion drawings for Patcham homes — prepared to Brighton & Hove City Council's design guidance, delivered in days and revised free until your decision lands, with a free approval-odds score 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 northern edges of Patcham and Withdean adjoin the South Downs National Park, where development on the open downland fringe is tightly restrained, which is where a policy-literate drawing pack earns its keep. Its dominant interwar (1918–1939) and postwar (1945–1970) housing stock sets the design brief on most streets.
Under Class B, a rear dormer stays permitted development up to 40m³ of added roof volume on a terrace or 50m³ on a semi-detached or detached house, while Class A allows a single-storey rear extension of 3m beyond the original rear wall on a terrace and 4m on a detached house before a full application is needed. Patcham carries at least one Article 4 direction, and conservation areas including Patcham and Tongdean remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Patcham is determined against an 8-week statutory target.
Old Patcham (the flint village core around All Saints church and the Black Lion), Ladies Mile (sweeping interwar semi-detached avenues on the downland slope), Tongdean (large detached 20th-century houses in a wooded conservation setting), Withdean (1930s semis and detached villas around the stadium and woods), Patcham Place (housing set against the Grade II* manor and its park) and Carden fringe (postwar suburban estates on the northern edge) — these are the Patcham pockets our drawings cover most. Heritage designations here include Patcham and Tongdean. Brighton & Hove City Council weighs each proposal against Brighton & Hove City Plan (Parts One 2016 and Two 2022) and the relevant SPDs, where the flint village core of Old Patcham and the wooded Tongdean estate are protected against alterations that would erode their established character. Pockets of larger houses around Withdean and Patcham have been converted into flats, which sit outside householder permitted-development rights.. On roofs the borough is hipped roofs on the interwar semis and bungalows and pitched clay-tiled roofs on the village cottages and larger villas, over interwar semi-detached houses and bungalows, the historic flint core of Old Patcham, large 20th-century detached houses at Tongdean and mock-Tudor and 1930s suburban villas.
Patcham's roofs set the brief. The borough is built largely from interwar semi-detached houses and bungalows, the historic flint core of Old Patcham, large 20th-century detached houses at Tongdean and mock-Tudor and 1930s suburban villas, and its lofts sit under hipped roofs on the interwar semis and bungalows and pitched clay-tiled roofs on the village cottages and larger villas — the geometry that decides whether a rear dormer, a hip-to-gable or a mansard gives you the headroom you want. Brighton & Hove City Council assesses loft proposals against Brighton & Hove City Plan (Parts One 2016 and Two 2022) and the relevant SPDs, and its case officers read each roof against the pair next door and the wider street before they read the plans.
That makes drawing quality decisive. We measure ridge and eaves heights, roof pitch and the existing stair, calculate the added volume against the permitted-development limits exactly, and show the workings on the drawings so Brighton & Hove City Council can verify them. The northern edges of Patcham and Withdean adjoin the South Downs National Park, where development on the open downland fringe is tightly restrained, so we resolve it on the page rather than leave it for the case officer to raise.
Patcham also carries protected streets — Patcham and Tongdean among them. Patcham is covered by the city-wide small-HMO Article 4 direction, while the Patcham conservation area — the historic downland village designated in 1970 — and the neighbouring Tongdean conservation area (designated 1989) protect their older cores from unrestricted alteration. We check your address against those designations before a line is drawn.
Many Patcham loft conversions proceed without planning permission — a rear dormer within the permitted-development volume limits (40 cubic metres on a terrace, 50 on a semi or detached house) is usually lawful. You will normally need a full application to Brighton & Hove City Council if any of these apply:
We draw the roof line, the ridge height and the neighbour's daylight on the page — the relationships Brighton & Hove City Council's officers check first — 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, pulled from official planning statistics and updated as new data lands. The council grants a high share of householder applications, and across Patcham and Withdean the main pressures are the South Downs National Park fringe to the north and keeping roof alterations in step with the interwar streets. Professionally prepared loft drawings anticipate those pressure points before submission, which is why complete, policy-literate packs are decided faster and refused less often than DIY applications.
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 Old Patcham, Ladies Mile and Tongdean, the recurring loft is the rear dormer — a box across the back roof slope that turns a cramped attic into a full-height double bedroom and en-suite. On hipped roofs on the interwar semis and bungalows, that is usually the most efficient use of the roof; where the stock is pitched clay-tiled roofs on the village cottages and larger villas, a hip-to-gable followed by a rear dormer unlocks far more space, though it needs a full application.
The flint village core of Old Patcham and the wooded Tongdean estate are protected against alterations that would erode their established character. We draw the dormer inside the volume allowance, keep the flat-roof build-up below the ridge, and set the face back from the eaves as the rules require — so the pack answers Brighton & Hove City Council's questions before they are asked. Where permitted-development rights are exhausted or removed, we prepare a householder application composed to the borough's roof-alteration guidance instead.
We draw loft conversions on every street in the borough. A few of the neighbourhoods where Patcham roofs come up most often:
Loft conversion drawings for Old Patcham's the flint village core around All Saints church and the Black Lion — measured, volume-checked and drawn to Brighton & Hove City Council's guidance.
Loft conversion drawings for Ladies Mile's sweeping interwar semi-detached avenues on the downland slope — measured, volume-checked and drawn to Brighton & Hove City Council's guidance.
Loft conversion drawings for Tongdean's large detached 20th-century houses in a wooded conservation setting — measured, volume-checked and drawn to Brighton & Hove City Council's guidance.
Loft conversion drawings for Withdean's 1930s semis and detached villas around the stadium and woods — measured, volume-checked and drawn to Brighton & Hove City Council's guidance.
Loft conversion drawings for Patcham Place's housing set against the Grade II* manor and its park — measured, volume-checked and drawn to Brighton & Hove City Council's guidance.
Loft conversion drawings for Carden fringe's postwar suburban estates on the northern edge — measured, volume-checked and drawn to Brighton & Hove City Council's guidance.
The right loft in Patcham depends on your roof. This is how the main types compare on planning route and the space they add.
| Loft type | Permitted development? | Space & headroom | What Brighton & Hove City Council checks |
|---|---|---|---|
| Rear dormer | Usually yes, within volume limits | Full-height double room at the back | Volume, set-back from eaves, ridge height |
| Hip-to-gable | No — full application | Extends the whole side of the roof | Roof bulk and the symmetry of the pair |
| Mansard | No — full application | Maximum floor area across the roof | Street character, especially in conservation areas |
| Rooflights only | Usually yes (Class C) | Light and headroom, no extra footprint | Whether rooflights sit within the existing slope |
Route depends on your street — conservation areas such as Patcham and Tongdean and Article 4 directions can remove permitted-development rights.
A fixed process built around how Brighton & Hove City Council validates and decides householder loft applications — most drawings are submission-ready within seven days of survey.
Tell us your Patcham postcode and roof type. We confirm your conservation and Article 4 status, 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, joist levels and the existing stair — the numbers the volume calculation and head heights depend on.
Chartered designers develop the dormer, hip-to-gable or mansard to your brief, drawn inside the Class B limits or 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 dormer within 40 cubic metres on a terrace, or 50 on a semi-detached or detached house, set back from the eaves and no higher than the ridge, is usually permitted development. In Patcham the main exceptions are hip-to-gable conversions, dormers visible from the highway, and homes in conservation areas such as Patcham and Tongdean or on streets with an Article 4 direction. Brighton & Hove City Council is the decision-maker.
Generally no. In conservation areas including Patcham and Tongdean, Class B permitted-development rights for lofts are removed, so a rear dormer that would be lawful elsewhere needs a full application to Brighton & Hove City Council. Patcham is covered by the city-wide small-HMO Article 4 direction, while the Patcham conservation area — the historic downland village designated in 1970 — and the neighbouring Tongdean conservation area (designated 1989) protect their older cores from unrestricted alteration. We check your exact address before drawing.
On hipped roofs on the interwar semis and bungalows, common across Patcham, a rear dormer is usually the most efficient conversion and often permitted development. Where the roof is pitched clay-tiled roofs on the village cottages and larger villas, a hip-to-gable followed by a rear dormer gains far more usable space but needs planning permission. Our survey confirms which your roof supports before we draw. Brighton & Hove City Council is the decision-maker.
A householder planning application in Patcham runs to a statutory eight-week target, and a lawful development certificate to eight weeks as well, though validation can add time if the pack is incomplete. We submit validation-complete drawings and manage case-officer queries to keep the decision on track. Brighton & Hove City Council is the decision-maker.
If your dormer is permitted development, a lawful development certificate from Brighton & Hove City Council is council-stamped proof of that — worth having, because every buyer's solicitor will ask for it when you sell. We prepare and submit the certificate application with the same drawing pack. This applies to your Patcham address specifically.
Every roof is different, so we quote each Patcham project individually — a fixed, no-obligation price back within one working day. The quote covers the full drawing pack with free revisions until Brighton & Hove City Council approves, and we tell you upfront whether your loft qualifies as permitted development. Call 020 7864 7245 to start.
Answer five quick questions and get a free planning score for your exact address — instantly. Then, if you want the full picture, unlock the detailed analysis: your council's live approval rates, local precedents, constraints on your street and a step-by-step route to permission.
Same fixed quotes, same fast drawings — wherever your project is.