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Wandsworth, London

Rear extension drawings in Wandsworth

Rear extension drawings for a Wandsworth house start at £695 including VAT. Wandsworth's Housing SPD asks for a rear extension that is subservient to the house and leaves a substantial depth of garden free of buildings, which for most properties means at least half the back garden. We design from the garden backwards.

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    Brick house being extended, with a wide new opening supported over the ground floor

    Wandsworth's garden-first rule for rear extensions

    The Housing SPD (covers rear extensions, basements, roof extensions and loft conversions) contains the borough's rear extension rule. A rear extension must be subservient to the house and leave a substantial depth of the original rear garden free of buildings: half the rear garden.

    The rule is stated in terms of garden, not projection. That changes how a design should start. Instead of asking how far the house can reach, we ask how much of the original garden must stay open, and the extension fills what that leaves.

    The same document covers basements, roof extensions and loft conversions, so a combined scheme is judged against one set of principles. The council also issues non-statutory guidance on basements: Basement extensions guidance (non-statutory).

    Finished white-rendered rear house extension with large glazed doors

    Local figures for Wandsworth

    Figures with their unit, period and source
    MeasureValuePeriodSource
    Rear extensions must be subservient to the house and leave a substantial depth of the original rear garden free of buildings, which for most properties means at least half the back garden.half the rear garden—wandsworth.gov.uk, Housing SPD 2016, p.39 (DMH5 vii); p.49, para 4.45
    Conservation areas46 named conservation areas published by the council—planning.data.gov.uk
    Listed building entries312 list entries (Historic England, within the LPA boundary)—planning.data.gov.uk
    Domestic gardens share of land (GLUD 2005)21.5 % of land that is domestic garden (GLUD 2005)2005data.london.gov.uk
    Householder decisions977 decisions1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications granted91.9 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications decided in time92.4 % decided within 8 weeks or an agreed extended period1 July 2025 - 30 June 2026assets.publishing.service.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.1(g)6 m (attached) / 8 m (detached), single storey, height max 4 m; not on article 2(3) land or an SSSI—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 Wandsworth

    Householder applications by street in Wandsworth

    Streets in Wandsworth with the most householder applications, and the share approved
    StreetApplicationsApproved
    Earlsfield Road2889%
    Dover House Road2774%
    Broomwood Road2692%
    Sutherland Grove2682%
    Elborough Street2592%
    Elsenham Street2591%
    Elsley Road24100%
    Wakehurst Road2490%
    Deodar Road2289%
    Huntingfield Road2291%
    Mallinson Road2291%
    Thurleigh Road22100%
    Engadine Street21100%
    Magdalen Road2180%
    Burntwood Lane2089%
    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

    Measuring the original garden

    The word original matters. The test refers to the original rear garden, so a house that has already been extended may have less room than the plot suggests.

    We survey the plot, establish the original rear wall and mark the half-garden line on the block plan. If the proposal leaves the line clear, the drawings say so plainly. If it crosses the line, the design needs a stronger justification on the sheets.

    Where an earlier owner has already added a conservatory or kitchen extension, we record it, because it uses up part of the allowance you thought you had. The block plan then shows the original garden, the earlier addition and the new extension in one view, so the officer can follow the arithmetic.

    Permitted development and prior approval

    National rules sit beside the borough's guide: 3 m (attached) / 4 m (detached) beyond the original rear wall, single storey for permitted development. Prior approval offers more for single-storey work: 6 m (attached) / 8 m (detached), single storey, height max 4 m; not on article 2(3) land or an SSSI. These rights ignore the borough's garden rule, so they can allow a larger extension than a planning application would.

    A Lawful Development Certificate in Wandsworth proves the lawful position in writing, which helps at sale and with your lender.

    Conservation areas and listed houses

    Wandsworth has 46 conservation areas and Historic England lists 312 entries in the borough. In a conservation area the deeper prior approval route is not available, and materials, roof form and the rear elevation are judged more closely. A listed house needs its own consent.

    We check the address against both before suggesting a route, and record the result in a short note you keep.

    Decisions and timings in Wandsworth

    Wandsworth decided 977 householder applications in its latest published year and granted 91.9 per cent. The share decided within eight weeks or an agreed extension was 92.4 per cent.

    Gardens cover about 21.5 per cent of the borough's land in the Greater London land-use survey. Past figures such as these describe the council's record and say nothing about one house.

    Price, checks and what you receive

    Drawings start at £695, VAT included and fixed in advance. You receive existing and proposed plans, elevations and sections, with a location plan and a block plan. A second chartered technologist checks every sheet, and we redraw free if the council asks for changes.

    Our building regulations drawings in Wandsworth follow, with the structural coordination a new opening needs. Residential extensions may also claim exemption from the levy, if the claim is made before work starts.

    If the council asks for changes after submission, we handle the revised sheets and the correspondence with the officer, so you are not left to interpret the comments yourself.

    Related services and neighbouring boroughs

    Combining the extension with a roof project? See loft conversion drawings in Wandsworth or dormer loft conversion drawings. The overview is at architectural drawings in Wandsworth.

    Next door, Lambeth, Merton and Richmond upon Thames apply different guidance. Our rear extension drawings page explains the national rules.

    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.
    Two-storey rear extension under construction on a semi-detached house
    Every side considered
    Flick across the turntable to spin it.

    Other services in Wandsworth

    Rear extension drawings nearby

    Questions

    How much of my garden must I leave in Wandsworth?

    The Housing SPD says a rear extension must leave a substantial depth of the original rear garden free of buildings, which for most properties means: half the rear garden.

    Does the half-garden rule apply to permitted development?

    No. It guides planning applications. Permitted development follows the national limit: 3 m (attached) / 4 m (detached) beyond the original rear wall, single storey.

    Which Wandsworth document covers basements and lofts too?

    The Housing SPD (covers rear extensions, basements, roof extensions and loft conversions). Separate non-statutory basement guidance sits alongside it.

    How much do rear extension drawings cost in Wandsworth?

    From £695 including VAT, fixed up front. The council's householder fee of £548 is separate.

    Sources and dates

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    Tell us about your property.

    We check the constraints, then send a fixed fee. Messages before 3pm get a reply the same working day.

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