Dormer, hip-to-gable and mansard loft conversion drawings for Southwark homes — prepared to Southwark Council's design guidance, delivered in days and revised free until your decision lands, with a free approval-odds score first.
Southwark Council granted 89% of the householder planning decisions it made in its latest published year — 2 points above the 87% England-wide householder average. Mansards and roof extensions on terraces are assessed against the established roofline and the conservation-area appraisal, which is where a policy-literate drawing pack earns its keep. Its dominant Georgian (1714–1837), Victorian (1837–1901) 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. Southwark carries at least one Article 4 direction, and conservation areas including Camberwell Grove, Dulwich Village and Bermondsey Street remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Southwark is determined against an 8-week statutory target.
Camberwell (Georgian and Victorian terraces around Camberwell Grove), Dulwich (villas and the Dulwich Village conservation area under the Dulwich Estate), Bermondsey (warehouse conversions and terraces off Bermondsey Street), Peckham (Victorian terraces including the Holly Grove enclave), Nunhead (modest Victorian terraces near Nunhead Green and the cemetery) and Walworth (dense Georgian and Victorian terraces threaded through large estates) — these are the Southwark pockets our drawings cover most. Heritage designations here include Camberwell Grove, Dulwich Village, Bermondsey Street, Holly Grove and Nunhead Green. Southwark Council weighs each proposal against the Southwark Plan and the borough's Residential Design Standards SPD, where the borough runs detailed basement and residential design standards on top of the usual tests. Camberwell, Peckham and the warehouse quarters around Bermondsey are heavily subdivided into flats, none of which hold householder permitted-development rights.. On roofs the borough is butterfly and parapet roofs on the terraces and flat and pitched roofs on the former warehouses, over Georgian and Victorian terraces, former warehouse and industrial conversions and Dulwich villas and postwar estates.
Southwark's roofs set the brief. The borough is built largely from Georgian and Victorian terraces, former warehouse and industrial conversions and Dulwich villas and postwar estates, and its lofts sit under butterfly and parapet roofs on the terraces and flat and pitched roofs on the former warehouses — the geometry that decides whether a rear dormer, a hip-to-gable or a mansard gives you the headroom you want. Southwark Council assesses loft proposals against the Southwark Plan and the borough's Residential Design Standards SPD, 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 Southwark Council can verify them. Mansards and roof extensions on terraces are assessed against the established roofline and the conservation-area appraisal, so we resolve it on the page rather than leave it for the case officer to raise.
Southwark also carries protected streets — Camberwell Grove, Dulwich Village, Bermondsey Street, Holly Grove and Nunhead Green among them. Southwark carries numerous Article 4 directions across conservation areas such as Camberwell Grove and Bermondsey Street, while the Dulwich Estate's scheme of management adds a separate layer of consent in Dulwich. We check your address against those designations before a line is drawn.
Many Southwark 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 Southwark Council if any of these apply:
We draw the roof line, the ridge height and the neighbour's daylight on the page — the relationships Southwark 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 Southwark Council's real householder decision record, pulled from official planning statistics and updated as new data lands. Southwark grants most householder applications, but heavy conservation-area coverage, its basement policies and the Dulwich Estate's scheme of management dictate what is achievable in many neighbourhoods. 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, rolling year). 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 Camberwell, Dulwich and Bermondsey, 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 butterfly and parapet roofs on the terraces, that is usually the most efficient use of the roof; where the stock is flat and pitched roofs on the former warehouses, a hip-to-gable followed by a rear dormer unlocks far more space, though it needs a full application.
The borough runs detailed basement and residential design standards on top of the usual tests. 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 Southwark 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 Southwark roofs come up most often:
Loft conversion drawings for Camberwell's Georgian and Victorian terraces around Camberwell Grove — measured, volume-checked and drawn to Southwark Council's guidance.
Loft conversion drawings for Dulwich's villas and the Dulwich Village conservation area under the Dulwich Estate — measured, volume-checked and drawn to Southwark Council's guidance.
Loft conversion drawings for Bermondsey's warehouse conversions and terraces off Bermondsey Street — measured, volume-checked and drawn to Southwark Council's guidance.
Loft conversion drawings for Peckham's Victorian terraces including the Holly Grove enclave — measured, volume-checked and drawn to Southwark Council's guidance.
Loft conversion drawings for Nunhead's modest Victorian terraces near Nunhead Green and the cemetery — measured, volume-checked and drawn to Southwark Council's guidance.
Loft conversion drawings for Walworth's dense Georgian and Victorian terraces threaded through large estates — measured, volume-checked and drawn to Southwark Council's guidance.
The right loft in Southwark 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 Southwark 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 Camberwell Grove and Dulwich Village and Article 4 directions can remove permitted-development rights.
A fixed process built around how Southwark Council validates and decides householder loft applications — most drawings are submission-ready within seven days of survey.
Tell us your Southwark 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 Southwark 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 Southwark Council's roof-alteration guidance.
We submit the certificate or application, manage validation and case-officer queries, and revise the drawings free until Southwark 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 Southwark the main exceptions are hip-to-gable conversions, dormers visible from the highway, and homes in conservation areas such as Camberwell Grove and Dulwich Village or on streets with an Article 4 direction. Southwark Council is the decision-maker.
Generally no. In conservation areas including Camberwell Grove and Dulwich Village, Class B permitted-development rights for lofts are removed, so a rear dormer that would be lawful elsewhere needs a full application to Southwark Council. Southwark carries numerous Article 4 directions across conservation areas such as Camberwell Grove and Bermondsey Street, while the Dulwich Estate's scheme of management adds a separate layer of consent in Dulwich. We check your exact address before drawing.
On butterfly and parapet roofs on the terraces, common across Southwark, a rear dormer is usually the most efficient conversion and often permitted development. Where the roof is flat and pitched roofs on the former warehouses, 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. Southwark Council is the decision-maker.
A householder planning application in Southwark 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. Southwark Council is the decision-maker.
If your dormer is permitted development, a lawful development certificate from Southwark 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.
Every roof is different, so we quote each Southwark project individually — a fixed, no-obligation price back within one working day. The quote covers the full drawing pack with free revisions until Southwark 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.