The fast route to a deep single-storey rear extension in Bexley — up to 6 metres on an attached house or 8 on a detached one — via Bexley Council's prior approval scheme rather than a full planning application.
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.
The ordinary Class A limits stop a single-storey rear extension at 3 metres on an attached house and 4 on a detached one. The larger home extension scheme doubles both, on condition that the council is told first. That notification is not an application for permission — the council cannot refuse on design, materials or policy grounds. It can only consider the effect on the amenity of adjoining premises, and only if a neighbour actually objects during the 21-day consultation.
The other conditions still apply and are strict: single storey only, no higher than 4 metres, eaves no higher than the existing eaves, and no more than half the land around the original house covered. It is not available on designated land, so a house in a conservation area such as Bexley Village and Danson Park cannot use it at all. Materials must be similar to the existing house, and the extension must not include a veranda, balcony or raised platform.
Bexley is largely interwar and postwar semi-detached houses, detached houses on larger plots and riverside and Victorian terraces. Green Belt at Crayford Marshes and Foots Cray Meadows tightly limits extensions on the borough's fringes, which matters here because an objecting neighbour puts amenity squarely in front of a case officer. 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.
The scheme is available where all of these hold. Fail any one and it is a full application to Bexley Council instead:
We prepare the notification pack Bexley Council needs — plans, elevations, a site plan with the adjoining owners identified — and manage the 21-day neighbour consultation so the 42-day clock is not restarted by an incomplete submission.
Below is Bexley Council's real householder decision record, drawn from official planning statistics and refreshed 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. Prior approval turns on neighbour amenity alone, so the drawings that matter are the ones showing the relationship to the boundary.
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 notifications that clear without objection are the ones that treat the neighbour as the audience. We show the extension in section against the boundary, demonstrate the 45-degree daylight relationship to the nearest habitable window, and where the plot is tight we taper the depth away from the boundary rather than running the full 6 metres to the fence.
Hipped roofs on paired semis mean hip-to-gable and dormers are judged on bulk and the pair's balance. Where an objection does arrive, the council's assessment is narrow: loss of light, outlook and overbearing effect on the adjoining property, nothing else. A pack that has already answered those three points on the drawings usually survives an objection, whereas one that leaves them to the officer's imagination usually does not.
We prepare prior-approval notifications across Bexley. A few of the areas where deep rear extensions come up most often:
Prior approval drawings for Old Bexley — the historic village strung along Bexley High Street — dimensioned to the 6m and 8m limits and prepared for Bexley Council's neighbour consultation.
Prior approval drawings for Bexleyheath — interwar semis around Danson Park and the Upton conservation area — dimensioned to the 6m and 8m limits and prepared for Bexley Council's neighbour consultation.
Prior approval drawings for Sidcup — 1930s houses and older streets near Old Sidcup and Foots Cray — dimensioned to the 6m and 8m limits and prepared for Bexley Council's neighbour consultation.
Prior approval drawings for Erith — riverside terraces and postwar housing by the Thames — dimensioned to the 6m and 8m limits and prepared for Bexley Council's neighbour consultation.
Prior approval drawings for Crayford — Victorian and interwar homes along the industrial edge — dimensioned to the 6m and 8m limits and prepared for Bexley Council's neighbour consultation.
Prior approval drawings for Welling — dense interwar semi-detached suburbs — dimensioned to the 6m and 8m limits and prepared for Bexley Council's neighbour consultation.
Same extension, two routes, very different tests.
| Route | Depth allowed | What the council may consider | Timescale |
|---|---|---|---|
| Ordinary Class A permitted development | 3m attached / 4m detached | Nothing — no application needed | Immediate |
| Larger home extension prior approval | 6m attached / 8m detached | Amenity of adjoining premises, only if a neighbour objects | 21-day consultation, 42-day determination |
| Full householder application | No fixed limit | Design, materials, policy, amenity, everything | 8-week target |
| Any of these on designated land | 3m / 4m only | Prior approval scheme unavailable | Full application beyond the limits |
Limits and procedure from the GPDO 2015, Schedule 2, Part 1, Class A and paragraph A.4, made permanent by amendment in 2019.
A process built around the 21-day consultation, which is where these schemes are won or lost.
Send us your Bexley postcode and house type. We confirm whether the property is on designated land, whether the scheme is available, and what depth you can realistically take.
We measure the original rear wall, eaves height, boundary distances and the neighbouring windows that the amenity assessment will turn on.
We draw the extension to the 6m or 8m limit with the boundary relationship shown in section, and prepare the written description and adjoining-owner details Bexley Council needs to start the consultation.
We submit, track the 21-day consultation and the 42-day determination, respond to any objection on amenity grounds, and revise free until the decision.
Three metres on a terraced or semi-detached house and four on a detached one under ordinary permitted development. Under the larger home extension prior approval scheme those double to six and eight metres, provided you notify Bexley Council before starting and the conditions on height, materials and land coverage are met. The scheme is not available on designated land.
It is a notification, not an application for permission. You tell Bexley Council what you intend to build, it writes to the adjoining owners, and they have 21 days to object. If nobody objects, you may build. If someone does, the council assesses the effect on the amenity of adjoining premises and must decide within 42 days. Design and policy are not in scope.
The council then considers the impact on the amenity of the adjoining property — loss of light, loss of outlook, and overbearing effect — and nothing else. It cannot refuse because it dislikes the design or the materials. We prepare the drawings so those three questions are already answered in section and on the site plan, which is what usually carries an objected scheme through. This applies to your Bexley address specifically. Bexley Council is the decision-maker.
No. The larger home extension scheme is unavailable on designated land, which includes conservation areas such as Bexley Village and Danson Park, national landscapes, national parks and world heritage sites. On those properties the ordinary 3-metre and 4-metre limits apply, and anything deeper needs a full householder application to Bexley Council.
Twenty-one days for the neighbour consultation, and a maximum of 42 days from a valid submission for the council to determine it. If the council does not respond within 42 days you may proceed as notified. That deadline is the scheme's real advantage over a full application, and it is why validation completeness matters so much. This applies to your Bexley address specifically. Bexley Council is the decision-maker.
Yes — always. Prior approval deals only with the planning position. A 6-metre rear extension still needs building control approval for foundations, structure, drainage, thermal performance and fire safety, and the beam over the opening into the existing house needs designing and calculating. We prepare both sets so the notified scheme is the buildable one. This applies to your Bexley address specifically. Bexley Council is the decision-maker.
We quote each Bexley scheme individually, because plot shape and the boundary relationship drive the work, and send a fixed, no-obligation quote within one working day. It covers the notification pack and free revisions until Bexley Council determines it. Call 020 7864 7245 to start.
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Same fixed quotes, same fast drawings — wherever your project is.