Dormer, hip-to-gable and mansard loft conversion drawings for Bexley homes — prepared to Bexley Council's design guidance, delivered in days and revised free until your decision lands, with a free approval-odds score first.
Bexley Council granted 88% of the householder planning decisions it made in its latest published year — 1 point above the 87% England-wide householder average. Green Belt at Crayford Marshes and Foots Cray Meadows tightly limits extensions on the borough's fringes, which is where a policy-literate drawing pack earns its keep. Its dominant Victorian (1837–1901), interwar (1918–1939) and postwar (1945–1970) 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. Bexley carries at least one Article 4 direction, and conservation areas including Bexley Village, Danson Park and Upton remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Bexley is determined against an 8-week statutory target.
Old Bexley (the historic village strung along Bexley High Street), Bexleyheath (interwar semis around Danson Park and the Upton conservation area), Sidcup (1930s houses and older streets near Old Sidcup and Foots Cray), Erith (riverside terraces and postwar housing by the Thames), Crayford (Victorian and interwar homes along the industrial edge) and Welling (dense interwar semi-detached suburbs) — these are the Bexley pockets our drawings cover most. Heritage designations here include Bexley Village, Danson Park, Upton, Old Sidcup and Foots Cray. Bexley Council weighs each proposal against the Bexley Local Plan and the borough's design guidance for householder development, where hipped roofs on paired semis mean hip-to-gable and dormers are judged on bulk and the pair's balance. On roofs the borough is hipped roofs on the interwar and postwar semis and gabled roofs on the detached houses, over interwar and postwar semi-detached houses, detached houses on larger plots and riverside and Victorian terraces.
Bexley's roofs set the brief. The borough is built largely from interwar and postwar semi-detached houses, detached houses on larger plots and riverside and Victorian terraces, and its lofts sit under hipped roofs on the interwar and postwar semis and gabled roofs on the detached houses — the geometry that decides whether a rear dormer, a hip-to-gable or a mansard gives you the headroom you want. Bexley Council assesses loft proposals against the Bexley Local Plan and the borough's design guidance for householder development, 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 Bexley Council can verify them. Green Belt at Crayford Marshes and Foots Cray Meadows tightly limits extensions on the borough's fringes, so we resolve it on the page rather than leave it for the case officer to raise.
Bexley also carries protected streets — Bexley Village, Danson Park, Upton, Old Sidcup and Foots Cray among them. Bexley applies Article 4 directions in conservation areas such as Bexley Village and Danson Park, and parts of the borough fall within Metropolitan Green Belt where extensions are firmly restricted. We check your address against those designations before a line is drawn.
Many Bexley 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 Bexley Council if any of these apply:
We draw the roof line, the ridge height and the neighbour's daylight on the page — the relationships Bexley 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 Bexley Council's real householder decision record, pulled from official planning statistics and updated as new data lands. Bexley approves a strong majority of householder applications, with Metropolitan Green Belt on its edges and the symmetry of paired suburban semis the main factors shaping approvals. 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 Old Bexley, Bexleyheath and Sidcup, 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 and postwar semis, that is usually the most efficient use of the roof; where the stock is gabled roofs on the detached houses, a hip-to-gable followed by a rear dormer unlocks far more space, though it needs a full application.
Hipped roofs on paired semis mean hip-to-gable and dormers are judged on bulk and the pair's balance. 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 Bexley 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 Bexley roofs come up most often:
Loft conversion drawings for Old Bexley's the historic village strung along Bexley High Street — measured, volume-checked and drawn to Bexley Council's guidance.
Loft conversion drawings for Bexleyheath's interwar semis around Danson Park and the Upton conservation area — measured, volume-checked and drawn to Bexley Council's guidance.
Loft conversion drawings for Sidcup's 1930s houses and older streets near Old Sidcup and Foots Cray — measured, volume-checked and drawn to Bexley Council's guidance.
Loft conversion drawings for Erith's riverside terraces and postwar housing by the Thames — measured, volume-checked and drawn to Bexley Council's guidance.
Loft conversion drawings for Crayford's Victorian and interwar homes along the industrial edge — measured, volume-checked and drawn to Bexley Council's guidance.
Loft conversion drawings for Welling's dense interwar semi-detached suburbs — measured, volume-checked and drawn to Bexley Council's guidance.
The right loft in Bexley 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 Bexley 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 Bexley Village and Danson Park and Article 4 directions can remove permitted-development rights.
A fixed process built around how Bexley Council validates and decides householder loft applications — most drawings are submission-ready within seven days of survey.
Tell us your Bexley 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 Bexley 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 Bexley Council's roof-alteration guidance.
We submit the certificate or application, manage validation and case-officer queries, and revise the drawings free until Bexley 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 Bexley the main exceptions are hip-to-gable conversions, dormers visible from the highway, and homes in conservation areas such as Bexley Village and Danson Park or on streets with an Article 4 direction. Bexley Council is the decision-maker.
Generally no. In conservation areas including Bexley Village and Danson Park, Class B permitted-development rights for lofts are removed, so a rear dormer that would be lawful elsewhere needs a full application to Bexley Council. Bexley applies Article 4 directions in conservation areas such as Bexley Village and Danson Park, and parts of the borough fall within Metropolitan Green Belt where extensions are firmly restricted. We check your exact address before drawing.
On hipped roofs on the interwar and postwar semis, common across Bexley, a rear dormer is usually the most efficient conversion and often permitted development. Where the roof is gabled roofs on the detached houses, 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. Bexley Council is the decision-maker.
A householder planning application in Bexley 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. Bexley Council is the decision-maker.
If your dormer is permitted development, a lawful development certificate from Bexley 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 Bexley project individually — a fixed, no-obligation price back within one working day. The quote covers the full drawing pack with free revisions until Bexley 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.