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Bromley, London

House extension drawings in Bromley

House extension drawings in Bromley start at £695 including VAT. Bromley has 108 Article 4 directions, so check whether an extension is still permitted development at your address. Two-storey work must also keep 1 m clear of the side boundary.

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    Finished white-rendered rear house extension with large glazed doors

    House extension drawings in Bromley and the side-space rule

    For a two-storey extension in Bromley, the key local rule is about the gap, not the depth. Proposals of two or more storeys, extensions included, must keep a minimum 1 m from the side boundary for the full height and length of the building, and more where a larger separation already exists. The rule keeps a visible gap between houses. The same plan also says flat-roofed side extensions of two or more storeys on traditionally roofed houses will normally be resisted unless well set back, so we draw a pitched roof where one fits.

    For a design this has two effects. A first-floor side extension has to be narrower than owners usually hope, and the ground-floor part can look out of proportion if it ignores the gap above it. If your plot already has a wide gap, the rule asks for more than the minimum, so we measure the existing separation on site rather than trusting a map. We draw the gap on the plan and the front elevation, and we test the layout to see whether a rear addition would serve you better.

    The wider guidance is the Urban Design Guide SPD, read with the Bromley Local Plan. For a rear extension we therefore draw the relationship to the plot, the neighbours and the street, because that is what the officer will weigh.

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

    Local figures for Bromley

    Figures with their unit, period and source
    MeasureValuePeriodSource
    Proposals of two or more storeys, including extensions, must retain a minimum 1 metre space from the side boundary for the full height and length of the building (more where higher separation exists).1 m—bromley.gov.uk, Bromley Local Plan 2019, p.46, Policy 8 Side Space
    Conservation areas47 named conservation areas published by the council—planning.data.gov.uk
    Article 4 directions108 Article 4 directions published by the council—planning.data.gov.uk
    Listed building entries412 list entries (Historic England, within the LPA boundary)—planning.data.gov.uk
    Green Belt share of the council area51 % of council area covered by green-belt polygons—planning.data.gov.uk
    Householder decisions1,609 decisions1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications granted78.6 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications decided in time89.1 % decided within 8 weeks or an agreed extended period1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder appeals decided by the Planning Inspectorate502 householder appeals decideddecision dates 1 Jul 2021 to 30 Jun 2026assets.publishing.service.gov.uk
    Householder appeals allowed37.6 % of householder appeals alloweddecision dates 1 Jul 2021 to 30 Jun 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
    Householder: alterations/extensions to a single dwellinghouse, from 1 Apr 2026548 GBP—ribblevalley.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 Bromley

    Householder applications by street in Bromley

    Streets in Bromley with the most householder applications, and the share approved
    StreetApplicationsApproved
    Petts Wood Road3981%
    Hayes Way3667%
    Crescent Drive3472%
    Village Way3281%
    Pickhurst Rise3187%
    Hayes Chase3083%
    Charterhouse Road2788%
    Farnaby Road2788%
    Kings Hall Road2591%
    St Paul's Wood Hill2588%
    Eden Park Avenue2477%
    Kent House Road2490%
    Broxbourne Road2391%
    Clock House Road2386%
    Elmstead Lane2381%
    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

    Conservation areas, Article 4 and the Green Belt

    Bromley has 47 conservation areas, 108 Article 4 directions and 412 listed entries, and about 51 per cent of the council area is Green Belt. That combination is why we check the address before any design work. A house on the edge of the borough can face a Green Belt size test, while one in a suburb can sit inside a direction that takes away its extension rights.

    If none applies, a rear extension may be permitted development up to 3 m (attached) / 4 m (detached) beyond the original rear wall, single storey, and the curtilage rule applies: Buildings (other than the original house) may not cover more than 50% of the curtilage.

    Bromley's decisions and appeals

    In its latest published year Bromley decided 1,609 householder applications, granted 78.6 per cent and decided 89.1 per cent in time. Roughly one in five was not granted.

    The Planning Inspectorate decided 502 householder appeals here over five years and allowed 37.6 per cent. Fewer than half succeed, so an appeal is a poor substitute for a well-prepared first application. We prefer to meet the council's tests on the first set of drawings. That means the survey comes first, the side gap and the neighbours' windows are dimensioned, and the design is tested against the rule before any sheet is drawn up for submission.

    What the drawings include and cost

    You receive existing and proposed plans, elevations and sections, a location plan and a block plan, with the side gap and any retained garden dimensioned. The fee starts at £695 with VAT included. The council's householder fee is £548.

    Every sheet is checked by a second chartered technologist, and if the council asks for changes we redraw at no charge until approval. That is a commitment about our fees, not a promise about the decision. Drawings are normally ready about a week after the survey, and a combined package with building regulations drawings is available once the design is settled. If your plan includes a rear extension as well as a side one, we draw both as one scheme so that the heights and rooflines agree on every sheet.

    Extension types and nearby boroughs

    For a first-floor addition at the side, see double-storey extension drawings in Bromley. A single-storey room at the back is covered by rear extension drawings in Bromley, and a room in the roof by loft conversion drawings in Bromley. The council summary is at architectural drawings in Bromley.

    Compare Sevenoaks and Lewisham across the boundary, or read the national rules on the house extension drawings hub.

    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.
    House extension under construction with scaffolding, new glazed doors and building materials
    Every side considered
    Flick across the turntable to spin it.

    Other services in Bromley

    House extension drawings nearby

    Questions

    How far must a two-storey extension be from the side boundary in Bromley?

    Bromley's policy asks for a minimum 1 m from the side boundary for the full height and length of the building, and more where a larger separation already exists.

    How much do house extension drawings cost in Bromley?

    From £695 including VAT, fixed before you commit. The council's application fee is separate.

    Does Bromley refuse many householder applications?

    It granted 78.6 per cent of 1,609 decisions in its latest year. That is borough-wide and says nothing about your house.

    Is Green Belt a problem for house extensions in Bromley?

    It can be. About 51 per cent of the council area is Green Belt, and size is judged against the original house there. We check your address first.

    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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