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Bromley, London

Loft conversion drawings in Bromley

A loft conversion in Bromley is drawn from £695 including VAT. The first question is your road, not your roof: Bromley has published 108 Article 4 directions, and any of them can take away rights that a loft would otherwise rely on.

From £695 (VAT included)

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    Brick cottage with a tiled roof, chimneys and a front dormer window

    What shapes a loft conversion in Bromley

    Bromley does not publish a loft-specific headroom or dormer-size figure that we can quote, so the local test here is the design guidance behind the Bromley Local Plan, adopted in 2,019. Roof alterations are read against the Urban Design Guide SPD, and what an officer asks about is how the new roof sits on the street rather than a number on a table.

    The borough is mostly houses. 68.6 per cent of households live in a house or bungalow, and 68.5 per cent own their home, so many owners here hold a roof of their own that permitted development can reach.

    Our drawings therefore concentrate on the elevation. We show the existing and proposed roof against the houses either side, so the officer can judge height, bulk and materials without having to visit first.

    On a detached house or a bungalow the roofline is often visible from several sides, so we also show how the new volume reads from the road and from the neighbours' gardens. A dormer pushed hard against a party wall, or a flat roof that reads heavy beside a pitched neighbour, is the kind of detail that draws an objection, and it is far cheaper to fix on paper than on site.

    Rear view of brick terraced houses in London with slate roofs and chimney stacks along the shared roofline

    Local figures for Bromley

    Figures with their unit, period and source
    MeasureValuePeriodSource
    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
    Households living in a house68.6 % of households living in a house or bungalow (detached, semi-detached or terraced)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 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 B, para B.1(d)40 m³ (terrace house) / 50 m³ (any other house) additional roof volume—legislation.gov.uk
    Class B, para B.1(c)No enlargement beyond the plane of a roof slope that forms the principal elevation and fronts a highway—legislation.gov.uk
    Class B, para B.1(f)Class B roof enlargements are not permitted development on article 2(3) land—legislation.gov.uk
    Approved Document K 2013, para 1.13, Diagram 1.4Loft conversions where 2.0 m cannot be achieved: 1.9 m at the centre of the stair, 1.8 m at the side (half width)—gov.uk
    Approved Document B Vol 1, para 2.21New storey above 4.5 m by loft conversion: protect the full escape route with fire-resisting doors (min E 20) and partitions (min REI 30)—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.
    Loft enlargement in section: the permitted development limitsExtra roof volume allowed: 40 m³ (terrace house) / 50 m³ (any other house) additional roof volume. Set-back from the eaves: Original eaves maintained; enlargement set at least 0.2 m from the eaves measured up the roof slope, so far as practicable (not required for hip-to-gable or roofs joining a rear/side extension). Height limit: No part higher than the highest part of the existing roofABC

    Loft enlargement in section: the permitted development limits

    A dormer on the rear slope, with the limits that decide whether it needs planning permission.

    A · Extra roof volume allowed
    40 m³ (terrace house) / 50 m³ (any other house) additional roof volume
    B · Set-back from the eaves
    Original eaves maintained; enlargement set at least 0.2 m from the eaves measured up the roof slope, so far as practicable (not required for hip-to-gable or roofs joining a rear/side extension)
    C · Height limit
    No part higher than the highest part of the existing roof

    Article 4 directions and conservation areas in Bromley

    Bromley has 47 conservation areas, and the national rules remove permitted development for a roof enlargement inside every one. Outside them, the borough's 108 Article 4 directions are the bigger unknown, because each one covers a defined set of addresses and each can withdraw a different right.

    We read the direction against your address before suggesting a route. If your house is clear, a Lawful Development Certificate in Bromley gives written confirmation that the loft is lawful. If it is not, the work goes through householder planning, drawn up as in our planning drawings in Bromley.

    Heritage is a third check. Historic England records 412 list entries in the borough, and a listed house needs separate consent for most roof work.

    Surveying the roof you actually have

    No two roofs can be assumed to match. Pitch, rafter depth, the line of the chimney and the position of the existing stair all vary from road to road. We survey the loft as it stands and set it on one datum with the floors beneath.

    That gives three answers early: how much usable floor the roof form can yield, where the new staircase lands, and what the structure needs. It also hands the engineer real dimensions for beams and bearings, which keeps the later building regulations drawings in Bromley in step with the planning set.

    Stairs deserve their own attention. Building regulations set minimum headroom for the new flight, and a house where the existing stair rises towards the front or the middle of the plan gives very different options from one with a stair against a flank wall. We test two or three positions on the survey and show you the floor you lose below for each, before any design is drawn up.

    How Bromley decides household applications, and appeals

    In its latest published year Bromley decided 1,609 householder applications and granted 78.6 per cent of them. 89.1 per cent were decided inside eight weeks or an agreed extension.

    Refusals do not always end there. The Planning Inspectorate decided 502 householder appeals from the borough and allowed 37.6 per cent. These figures cover every type of household project and say nothing about one house, so we use them to plan time, not to forecast a result.

    What the drawing set contains and what it costs

    A Bromley loft set has existing and proposed floor plans, the new stair, the roof in section and all four elevations, with the block and location plans. Loft conversion drawings are priced from £695 including VAT, agreed before you commit, and are normally ready about a week after the survey.

    A second chartered technologist reviews each sheet before it goes anywhere. If the council asks for changes, we redraw at no extra charge until the application is decided.

    Other roof forms and nearby boroughs

    Settled on a dormer? See dormer loft conversion drawings in Bromley. If an extension at the back is part of the plan, rear extension drawings in Bromley cover it. For everything we draw in the borough, start from architectural drawings in Bromley, or compare the neighbouring rules in Lewisham and Croydon.

    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.
    Slate-clad roof extension on a yellow-brick London terraced house
    Storey by storey
    Move up and down — the car travels between floors.

    Questions

    Do I need planning permission for a loft conversion in Bromley?

    It depends on your address. A roof enlargement is not permitted development in any of Bromley's 47 conservation areas, and the borough's Article 4 directions can remove rights elsewhere. If neither applies, a Lawful Development Certificate can confirm the loft is lawful.

    How much do loft conversion drawings cost in Bromley?

    From £695 including VAT, fixed before you commit. Any council fee is paid to the council separately.

    Which guidance does Bromley use for roof alterations?

    The Bromley Local Plan and its Urban Design Guide SPD. We could not find a published loft-specific measurement to quote, so we check the design against the street.

    How long do Bromley householder applications take?

    89.1 per cent of householder applications were decided within eight weeks or an agreed extension in the latest year published. That is an average across all projects, not a promise for yours.

    Sources and dates

    City of London skyline glowing at dusk across the Thames under a dramatic orange sky

    Tell us about your property.

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