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Bexley, London

Rear extension drawings in Bexley

Rear extension drawings for a Bexley house start at £695 including VAT. Bexley's design guide gives a clear number for the usual case: on a semi-detached or terraced house, a single-storey rear extension on the boundary should not normally exceed 3.5 m deep / 3.1 m high. The drawings are built around that line.

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    Two-storey rear extension under construction on a semi-detached house

    Rear extension drawings in Bexley: what the design guide asks

    The Design Guide SPD Part 2: Building Alterations and Extensions is the council's reference for extensions. For semi-detached and terraced houses it says a single-storey rear extension built on the boundary should not normally exceed 3.5 m deep / 3.1 m high, with the height measured to the eaves where the roof is pitched.

    The rule is written for an extension on the boundary, so the distance to the neighbour matters. Our drawings show the distance to each boundary and the neighbour's nearest window, so the officer can see the reasoning without a site visit.

    The guide's first part, the Design Guide SPD Part 1: Design Principles, covers the general principles of scale, materials and how an extension reads against the original house. We follow both when we draw, since a compliant depth can still fail if it looks like a different building.

    House extension under construction with scaffolding, new glazed doors and building materials

    Local figures for Bexley

    Figures with their unit, period and source
    MeasureValuePeriodSource
    Semi-detached and terraced houses: single storey rear extensions on the boundary should not normally exceed 3.5 m in depth or 3.1 m in height (to eaves with pitched roofs).3.5 m deep / 3.1 m high—bexley.gov.uk, Bexley Design and Development Control Guidelines SPD, p.5, para 2.3.2(1)
    Conservation areas23 named conservation areas published by the council—planning.data.gov.uk
    Listed building entries114 list entries (Historic England, within the LPA boundary)—planning.data.gov.uk
    Green Belt share of the council area17 % of council area covered by green-belt polygons—planning.data.gov.uk
    Householder decisions877 decisions1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications granted94.6 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications decided in time99.4 % decided within 8 weeks or an agreed extended period1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Larger home extension prior approvals granted7 decisions2025 Q2 to 2026 Q1 (1 Apr 2025 to 31 Mar 2026)assets.publishing.service.gov.uk
    Larger home extension prior approvals refused8 decisions2025 Q2 to 2026 Q1 (1 Apr 2025 to 31 Mar 2026)assets.publishing.service.gov.uk
    Domestic gardens share of land (GLUD 2005)25.1 % of land that is domestic garden (GLUD 2005)2005data.london.gov.uk
    GPDO 2015 Sch 2 Pt 1 Class A, para A.1(f)(i)3 m (attached) / 4 m (detached) beyond the original rear wall, single storey—legislation.gov.uk
    Class A, para A.4(10)(c): development may begin if the LPA has not notified a decision within 42 days of receiving the information42 days—legislation.gov.uk

    A blank value means the figure has not been published, not that there are none. Check your own address with the council.

    Councils bordering Bexley

    Householder applications by street in Bexley

    Streets in Bexley with the most householder applications, and the share approved
    StreetApplicationsApproved
    Rydal Drive3688%
    Danson Road3578%
    Glenhurst Avenue3491%
    Westwood Lane3494%
    Wren Road3389%
    Harland Avenue3297%
    Halfway Street3167%
    Northumberland Avenue3197%
    Okehampton Crescent3090%
    Upton Road2679%
    Bellegrove Road2591%
    Latham Road25100%
    Mayplace Road East2584%
    Walton Road25100%
    Wansunt Road2596%
    Counts of householder applications by street; no individual applications are shown. Streets with fewer than five applications are left out.Source: GLA Planning London Datahub, householder applications, all years held. Contains public sector information licensed under the Open Government Licence v3.0. Contains OS data © Crown copyright and database right 2026.
    Single-storey rear extension: the permitted development limitsDepth beyond the original rear wall: 3 m (attached) / 4 m (detached) beyond the original rear wall, single storey. Maximum height: 4 m. Within the zone near the boundary: Eaves no higher than 3 m where within 2 m of the curtilage boundary. Larger extension under prior approval: 6 m (attached) / 8 m (detached), single storey, height max 4 m; not on article 2(3) land or an SSSIABCD

    Single-storey rear extension: the permitted development limits

    The house in section with a rear extension; the dashed lines mark the zone near the boundary.

    A · Depth beyond the original rear wall
    3 m (attached) / 4 m (detached) beyond the original rear wall, single storey
    B · Maximum height
    4 m
    C · Within the zone near the boundary
    Eaves no higher than 3 m where within 2 m of the curtilage boundary
    D · Larger extension under prior approval
    6 m (attached) / 8 m (detached), single storey, height max 4 m; not on article 2(3) land or an SSSI

    Permitted development, prior approval or planning in Bexley

    A single-storey rear extension is permitted development up to 3 m (attached) / 4 m (detached) beyond the original rear wall, single storey, with eaves near a boundary limited by Eaves no higher than 3 m where within 2 m of the curtilage boundary. Longer extensions can seek prior approval, with 42 days for the council to respond.

    Bexley decided 7 large householder extension prior approvals in favour and 8 against, a close split. That makes the neighbour assessment the part to get right. If the design goes past the permitted limits, a householder application follows.

    Setting the extension out from the boundary

    Because the guide's number applies on the boundary, the cleanest way to a longer room is often to step the extension away from it. A modest gap, or a roof that falls towards the garden, changes how the extension feels to the neighbour without losing floor area where you want it.

    We draw the options side by side where the choice is open: full depth on the boundary within the limit, a stepped plan, or a mono-pitch roof that keeps the eaves at the lower height at the party wall. Each is shown against the neighbour's windows, so the trade-off is visible before you commit.

    Conservation, Green Belt and heritage in Bexley

    Bexley has 23 conservation areas, 114 Historic England list entries and 17 per cent Green Belt coverage. Green Belt land is judged against a different test, so we check the address before choosing a route.

    Domestic gardens cover 25.1 per cent of Bexley's land. The design question becomes the quality of the garden you keep: its depth, the light it gets and how the new room opens onto it. We show the retained garden on the block plan so that trade-off is plain.

    How Bexley has been deciding householder applications

    Bexley decided 877 householder applications in its latest published year and granted 94.6 per cent. It decided 99.4 per cent in time. The figures cover every householder project, not just rear extensions, and they say nothing about a single house, so we use them to plan timing, not to predict a result.

    What the drawings show and the price

    A Bexley rear extension set has existing and proposed floor plans, a section through the new roof, all elevations and the location and block plans. Rear extension drawings start at £695 with VAT included, fixed before you commit, and are normally ready after the survey.

    A second chartered technologist checks every sheet, and if the council asks for changes we redraw at no charge until approval. The same survey then carries the design into the building regulations drawings for structure, insulation and drainage.

    Other extensions and neighbouring boroughs

    For a bigger project, see house extension drawings in Bexley, double storey extension drawings or loft conversion drawings. The service overview is at rear extension drawings, and the borough overview at architectural drawings in Bexley. Compare the rules in Dartford, Greenwich and Bromley.

    What you receive

    Planning drawing sheet for a rear extension with plans, elevations and sections
    Sample drawing. Planning drawings for a rear extension: plans, elevations and sections on one sheet set.
    Brick house being extended, with a wide new opening supported over the ground floor
    Every side considered
    Flick across the turntable to spin it.

    Other services in Bexley

    Rear extension drawings nearby

    Questions

    How deep can a rear extension be in Bexley?

    For semi-detached and terraced houses, Bexley's guide says a single-storey extension on the boundary should not normally exceed 3.5 m deep / 3.1 m high.

    Does Bexley measure height to the ridge or the eaves?

    For the boundary rule, height is to the eaves where the roof is pitched, as the design guide states.

    How much do rear extension drawings cost in Bexley?

    From £695 including VAT, fixed up front. Any council application fee is paid separately.

    Which Bexley guidance applies to extensions?

    The Design Guide SPD Part 2: Building Alterations and Extensions, alongside the Design Guide SPD Part 1: Design Principles.

    Sources and dates

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