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

01Croydon, London

Mansard roof drawings in Croydon

Croydon's conservation area test for a roof is one question: can the extension be seen from the public highway? If it can, the council's guidance treats it as unlikely to be acceptable, so we draw the roof as the highway sees it, from £845 including VAT.

From £845 (VAT included)

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    02The brief

    What Croydon asks of a roof in a conservation area

    The council's Conservation Areas General Guidance SPD gives three tests for roofs. First, extensions visible from the public highway are unlikely to be acceptable, and hip-to-gable changes are unlikely to be permitted. Second, an acceptable extension adds minimal height and bulk and matches the existing pitches.

    Third, dormers need permission in a conservation area, usually no wider than the existing windows and set in from the building edge. We draw the street elevation and the rear elevation separately, so the officer sees which view is which.

    Rear view of brick terraced houses in London with slate roofs and chimney stacks along the shared roofline
    Brick cottage with a tiled roof, chimneys and a front dormer window
    Photograph: Tanya Barrow

    03The record

    Local figures for Croydon

    Figures with their unit, period and source
    MeasureValuePeriodSource
    In conservation areas, roof extensions visible from public highway unlikely acceptable; hip-to-gable unlikely permittednot visible from highwayNo periodcroydon.gov.uk, Croydon Conservation Area General Guidance SPD 2013, para 5.3.7
    Acceptable roof extensions must be subordinate, added height and bulk minimised, pitches matchingsubordinate, minimal bulkNo periodcroydon.gov.uk, Croydon Conservation Area General Guidance SPD 2013, para 5.3.8
    Dormers need permission in conservation areas, usually no wider than existing windows, set in from building edgeno wider than existing windowsNo periodcroydon.gov.uk, Croydon Conservation Area General Guidance SPD 2013, para 5.10.5
    Supplementary planning documentConservation Areas General Guidance SPDNo periodcroydon.gov.uk
    Conservation areas19 named conservation areas published by the councilNo periodplanning.data.gov.uk
    Party Wall etc. Act 1996 s3(2)(a)Party structure notice at least 2 months before workNo periodlegislation.gov.uk
    Householder decisions786 decisions1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications granted86.6 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Upward home extension prior approvals granted2 decisions2025 Q2 to 2026 Q1 (1 Apr 2025 to 31 Mar 2026)assets.publishing.service.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
    Householder: alterations/extensions to a single dwellinghouse, from 1 Apr 2026548 GBPNo periodribblevalley.gov.uk

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

    Croydon7 neighbouring councils
    Councils bordering Croydon

    04The streets

    Householder applications by street in Croydon

    Streets in Croydon with the most householder applications, and the share approved
    StreetApplicationsApproved
    Devonshire Way3556%
    Mount Park Avenue3079%
    Farley Road2885%
    Chaldon Way2592%
    Norbury Hill2482%
    Pollards Hill South2463%
    Bradmore Way2387%
    Woodcote Valley Road2376%
    Littleheath Road2264%
    Valley Road2264%
    Shirley Road2174%
    Upfield2065%
    Arkwright Road1983%
    Georgia Road1963%
    Caterham Drive1878%

    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

    Outside the conservation areas

    Outside the 19 conservation areas in the national planning data, the national rules apply: Class B requires the original eaves to be maintained or reinstated, which a parapet-fronted mansard normally removes. For upward extensions, Class AA additional storeys exclude houses built before 1 Jul 1948 or after 28 Oct 2018. The statistics show 2 upward-extension prior approvals granted and 3 refused, a small sample. Where the new roof meets a shared wall, the Party Wall etc. Act 1996 adds a notice: Party structure notice at least 2 months before work.

    Householder volume in the borough

    Croydon decides a lot of householder cases: 786 over the twelve months of the statistics, with 86.6% granted and 94.4% decided in time. That is history and not a forecast for your roof.

    Listed and period houses

    The list holds 180 entries in the borough. Work to the roof of a listed house can need consent too, and listed building consent drawings in Croydon covers the second application. A cellar or lower floor under the same house is a separate matter for basement conversion drawings in Croydon. The mansard roof hub shows how other boroughs set their tests.

    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

    Converted loft bedroom with roof windows and a Juliet balconyLoft conversions
    Photograph: Imad Clicks
    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

    Can a mansard be visible from the street in a Croydon conservation area?

    The guidance treats extensions visible from the public highway as unlikely to be acceptable. We show the street view first and tell you early if the design fails that test.

    Does Croydon allow hip-to-gable roofs in conservation areas?

    The same guidance treats hip-to-gable changes in a conservation area as unlikely to be permitted. Outside one, the national rules apply and we check your address.

    Do dormers need permission in a Croydon conservation area?

    Yes. The guidance says a dormer there should usually be no wider than the existing windows and set in from the edge of the building.

    What does the application cost?

    The council's householder fee is £548. Our fee starts at £845 including VAT.

    Upper floors of a large yellow-brick Victorian house in London with chimney pots

    86.6%

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

    Photograph: Lorenc Memaga

    09Further reading

    Other services in Croydon

    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 Croydon