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Bromley, London

Double-storey extension drawings in Bromley

Double-storey extension drawings for a Bromley house start at £1,295 including VAT. The first thing we check is Bromley's side space policy: a building of two or more storeys must keep 1 m clear of the side boundary for its full height and length.

From £1,295 (VAT included)

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    Finished white-rendered rear house extension with large glazed doors

    Bromley's side space policy and a double-storey extension

    The side space policy in the Bromley Local Plan is the rule we draw to first for a two-storey side extension. Proposals of two or more storeys, extensions included, must keep a minimum of 1 m from the side boundary for the full height and length of the building, and more where the neighbouring separation is already greater. The aim is to keep a gap between houses.

    Two features of the policy matter in drawing. The space is measured for the whole building, so a ground-floor extension built up to the boundary can leave nothing for a first floor above it. And the requirement runs for the full length, not just at the front, so a stepped flank does not help.

    The Plan adds a point about the roof: flat-roofed side extensions of two or more storeys to a house with a traditional roof will normally be resisted unless they are well set back and unobtrusive, and pitched roofs are preferred. We draw the roof as part of the first option for that reason, and show a flat alternative only where the house itself allows one.

    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
    Heritage at Risk entries25 Heritage at Risk Register entries within the LPA boundary (Historic England)—planning.data.gov.uk
    Green Belt share of the council area51 % of council area covered by green-belt polygons—planning.data.gov.uk
    Households living in a house68.6 % of households living in a house or bungalow (detached, semi-detached or terraced)Census 2021nomisweb.co.uk
    Owner-occupied households68.5 % of households owner-occupied (owned outright or with mortgage/loan)Census 2021nomisweb.co.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: 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.
    The 45-degree test in planTest used in daylight assessments: 45 degrees (plan and elevation)A

    The 45-degree test in plan

    A line from the middle of the neighbour's nearest window: the extension should stay behind it.

    A · Test used in daylight assessments
    45 degrees (plan and elevation)

    Conservation areas, Article 4 and Green Belt in Bromley

    Bromley has 47 conservation areas, 108 Article 4 directions and 412 Historic England list entries, with 25 entries on the Heritage at Risk Register. Green Belt covers 51 per cent of the borough.

    In a conservation area the national rule is: No rear extension of more than one storey under PD on article 2(3) land. The Urban Design Guide SPD is the design reference for the rest. We check the address against every designation, Green Belt included, before we suggest a route.

    Permitted development or a householder application

    Under permitted development the limit for more than one storey is: Over one storey: max 3 m beyond the original rear wall and not within 7 m of the rear boundary. Bromley's side space policy is a planning test on top of that, so the council's rule decides any side extension of two storeys.

    A householder application costs £548, paid to the council. We prepare it with our planning drawings in Bromley. For other shapes of project, see house extension drawings in Bromley.

    How Bromley decides householder applications

    Bromley decided 1,609 householder applications in its latest published year and granted 78.6 per cent. It decided 89.1 per cent within eight weeks or an agreed extension.

    68.6 per cent of households live in a house or bungalow and 68.5 per cent own their home. The decision figures cover every kind of household work, and we use them for timing, not for prediction.

    Upper floor, fire and party wall details

    A bedroom over a new room brings a rule for the escape window: Escape window: unobstructed openable area at least 0.33 m², at least 450 mm high and 450 mm wide, bottom of opening no more than 1100 mm above floor. The roof has to follow the house: Roof pitch of a 2+ storey enlargement to match the original house so far as practicable.

    These details, with the structure, go on the building regulations drawings in Bromley. Where the new storey bears on a shared wall, a notice is needed: Party structure notice at least 2 months before work.

    Price, process and nearby boroughs

    Double-storey extension drawings start at £1,295 with VAT included, fixed before you commit. We survey on one datum, set the side space out on the plan and freeze the design in writing. A second chartered technologist checks every sheet, and if the council asks for changes we redraw at no charge until approval.

    If a roof extension is the better answer, see loft conversion drawings in Bromley. For the borough as a whole, read architectural drawings in Bromley. Compare the same rules in Lewisham, Croydon and Bexley, or start from the overview of double-storey extension drawings.

    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

    Double-storey extension drawings nearby

    Questions

    What is Bromley's side space policy?

    The side space policy asks for a minimum of 1 m between a building of two or more storeys and the side boundary, for the full height and length of the building.

    Can I build a flat-roofed two-storey side extension in Bromley?

    The Local Plan says flat-roofed side extensions of two or more storeys to a house with a traditional roof will normally be resisted unless they are well set back and unobtrusive. Pitched roofs are preferred.

    Do I need planning permission for a double-storey extension in Bromley?

    Usually. Permitted development stops at: Over one storey: max 3 m beyond the original rear wall and not within 7 m of the rear boundary. Bromley has 47 conservation areas where it does not apply to a rear extension of more than one storey.

    How much do double-storey extension drawings cost in Bromley?

    From £1,295 including VAT, fixed up front. The council's fee of £548 is paid separately to the council.

    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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