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Slate-clad roof extension on a yellow-brick London terraced house
Photograph: Daniel Sikpi

01Barking and Dagenham, London

Mansard roof drawings for Barking and Dagenham houses

Barking and Dagenham asks a roof extension to match original roof pitch, eaves and materials, and to be subordinate to original dwelling. A mansard changes the pitch, so it has to answer the first test openly. We draw it that way from £845 including VAT, with the existing roof and the proposal on the same sheet.

From £845 (VAT included)

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    02The brief

    Two roof tests from the Local Plan

    The Barking and Dagenham 2037 Local Plan sets both tests in its policy on extensions and alterations: respect the area's roofscape by matching the original pitch, eaves and materials, and stay sympathetic and subordinate to the original dwelling. A mansard departs from the original pitch by design, so the drawings must show why the departure is subordinate.

    We do that with an existing and proposed elevation of the whole terrace or pair, and a section through the new roof. The council also lists the Residential Extensions and Alterations SPD, which applies alongside the plan.

    Upper floors of a large yellow-brick Victorian house in London with chimney pots
    Converted loft bedroom with roof windows and a Juliet balcony
    Photograph: Imad Clicks

    03The record

    Local figures for Barking and Dagenham

    Figures with their unit, period and source
    MeasureValuePeriodSource
    Extensions should respect the area's roofscape and match the original roof style, pitch, eaves treatment and materials.match original roof pitch, eaves and materialsNo periodlbbd.gov.uk, Barking and Dagenham Local Plan 2020-2037 (adopted 2024), Policy DMD 5(1)(d), p.95-96
    Extensions and alterations must be sympathetic and subordinate to the original dwelling in scale, form, materials and detailing.subordinate to original dwellingNo periodlbbd.gov.uk, Barking and Dagenham Local Plan 2020-2037 (adopted 2024), Policy DMD 5(1)(a)
    Class B, condition B.2(b)(i)(aa)Class B requires the original eaves to be maintained or reinstated, which a parapet-fronted mansard normally removesNo periodlegislation.gov.uk
    Class AA, para AA.1(c)Class AA additional storeys exclude houses built before 1 Jul 1948 or after 28 Oct 2018No periodlegislation.gov.uk
    Class AA, para AA.1(b)Class AA is not available on article 2(3) landNo periodlegislation.gov.uk
    Householder: alterations/extensions to a single dwellinghouse, from 1 Apr 2026548 GBPNo periodribblevalley.gov.uk
    Party Wall etc. Act 1996 s3(2)(a)Party structure notice at least 2 months before workNo periodlegislation.gov.uk
    Article 4 directions3 Article 4 directions published by the councilNo periodplanning.data.gov.uk
    Conservation areas4 named conservation areas published by the councilNo periodplanning.data.gov.uk
    Householder decisions388 decisions1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications granted66.5 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk

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

    Barking and Dagenham4 neighbouring councils
    Councils bordering Barking and Dagenham

    04The streets

    Householder applications by street in Barking and Dagenham

    Streets in Barking and Dagenham with the most householder applications, and the share approved
    StreetApplicationsApproved
    Westrow Drive5162%
    Upney Lane3579%
    Beccles Drive3467%
    Lyndhurst Gardens2862%
    Blake Avenue2270%
    Western Avenue2250%
    Salisbury Avenue2174%
    Lichfield Road1956%
    Melford Avenue1975%
    Rugby Road1958%
    East Road1861%
    Fanshawe Crescent1871%
    Marston Avenue1872%
    Sandringham Road1871%
    Woodbridge Road1869%

    Counts of householder applications by street; no individual applications are shown. Streets with fewer than five applications are left out.

    GLA Planning London Datahub, householder applications

    05The drawing

    A mansard roof in sectionA, Permitted development and the eaves: Class B requires the original eaves to be maintained or reinstated, which a parapet-fronted mansard normally removes. B, Additional storeys under permitted development: Class AA additional storeys exclude houses built before 1 Jul 1948 or after 28 Oct 2018. C, Fire protection to the stair: New 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)ABC

    A mansard roof in section

    A London terrace with a mansard behind the parapet. The lettered marks show the limits the legend gives.

    A Permitted development and the eaves
    Class B requires the original eaves to be maintained or reinstated, which a parapet-fronted mansard normally removes
    B Additional storeys under permitted development
    Class AA additional storeys exclude houses built before 1 Jul 1948 or after 28 Oct 2018
    C Fire protection to the stair
    New 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)
    The mansard in three dimensions3D
    Scroll the page: the model turns with it.

    06The detail

    Permitted development stops short of a mansard

    Class B requires the original eaves to be maintained or reinstated, which a parapet-fronted mansard normally removes. The upward-extension route, Class AA, is also narrow: Class AA additional storeys exclude houses built before 1 Jul 1948 or after 28 Oct 2018, and Class AA is not available on article 2(3) land.

    The council also publishes 3 Article 4 directions, and the address check reads each one against your house. A mansard therefore starts as a householder application, and our free constraints check confirms that before we quote.

    The householder record

    The council decided 388 householder applications in its latest published year and granted 66.5%, with 100% decided on time. That is the whole borough's record for every kind of householder work, so treat the figure as context and not as a mansard rate.

    The householder fee for a house is £548, paid to the council separately from our fee. A shared roof also needs a party structure notice: Party structure notice at least 2 months before work.

    Streets where the roof is part of the setting

    Where a house is listed or sits in one of the borough's 4 conservation areas, the roof is also heritage fabric. Read listed building consent drawings in Barking and Dagenham first, and mansard roof drawings for how a mansard is judged on a period terrace. A new lower floor is a separate question, answered under basement conversion drawings in Barking and Dagenham.

    Planning sheet for a single-storey rear extension: proposed ground floor plan and rear elevation, with the Property Architecture title block
    Sample drawing. Proposed plan and rear elevation from a planning application set, sheet 03 at 1:50.

    07The papers

    What the drawings rest on

    Brick cottage with a tiled roof, chimneys and a front dormer windowLawful development certificates
    Photograph: Tanya Barrow
    Loft floor plan marked up in an independent review, with three critical issues clouded and explained
    Sample drawing. A loft plan with the reviewer’s mark-up: stair pitch, dormer cheeks and roof ventilation.

    08Correspondence

    Questions

    Will Barking and Dagenham accept a mansard on a house with a pitched roof?

    The Local Plan asks for the original pitch to be matched, so the application has to argue the case. We draw the roof against its neighbours and show the pitch, dormers and materials, and the officer decides.

    Is there a published SPD for roof extensions?

    The council's guidance on alterations is its Residential Extensions and Alterations SPD. It does not give separate mansard guidance, so the Local Plan policy is the main test.

    What does your mansard fee include?

    Our fee starts at £845 including VAT and covers existing and proposed drawings for the application. Council fees are separate, and a second technologist checks every set.

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

    66.5%

    Householder applications granted, Barking and Dagenham, 1 July 2025 - 30 June 2026. Source: assets.publishing.service.gov.uk

    Photograph: Ben Hadfield

    09Further reading

    Other services in Barking and Dagenham

    Mansard roof drawings nearby

    10Sources

    Sources and dates

    Licences

    Kensington street lined with brick townhouses and lit streetlamps beneath an orange dusk sky

    Send us the address of your house.

    We look up the conservation area, listing and Article 4 position, then reply with a fixed fee. A message before 3pm is answered the same working day.

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    Mansard roof drawings in Barking and Dagenham