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

01Enfield, London

Mansard roof drawings for Enfield houses

Enfield has 33 Article 4 direction areas, and a house inside one has already lost permitted development rights it would otherwise have. So the first job on an Enfield mansard is a map check, and the drawings follow from £845 including VAT.

From £845 (VAT included)

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    02The brief

    Start with the Article 4 map

    An Article 4 direction removes rights that a house would otherwise carry, and the borough maps 33 such areas. It also publishes 24 conservation areas and holds 301 list entries, some of them roofs that need listed building consent too: see listed building consent drawings in Enfield.

    The free constraints check reads your address against all three layers, so you know which application you face before you pay for a survey.

    Converted loft bedroom with roof windows and a Juliet balcony
    Rear view of brick terraced houses in London with slate roofs and chimney stacks along the shared roofline
    Photograph: Ben Hadfield

    03The record

    Local figures for Enfield

    Figures with their unit, period and source
    MeasureValuePeriodSource
    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
    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)No periodgov.uk
    Approved Document L Vol 1 2021 incl. 2023 amendments, Table 4.2New elements in existing dwellings, limiting U-values W/(m²·K): roof 0.15, wall 0.18, floor 0.18, windows 1.4 (or WER Band B), doors 1.4No periodgov.uk
    Conservation areas24 named conservation areas published by the councilNo periodplanning.data.gov.uk
    Article 4 direction areas33 Article 4 direction area polygons published by the councilNo periodplanning.data.gov.uk
    Listed building entries301 list entries (Historic England, within the LPA boundary)No periodplanning.data.gov.uk
    Householder decisions934 decisions1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications granted83.4 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Upward home extension prior approvals granted0 decisions2025 Q2 to 2026 Q1 (1 Apr 2025 to 31 Mar 2026)assets.publishing.service.gov.uk
    Larger home extension prior approvals granted35 decisions2025 Q2 to 2026 Q1 (1 Apr 2025 to 31 Mar 2026)assets.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.

    Enfield7 neighbouring councils
    Councils bordering Enfield

    04The streets

    Householder applications by street in Enfield

    Streets in Enfield with the most householder applications, and the share approved
    StreetApplicationsApproved
    Lonsdale Drive4385%
    Wynchgate3784%
    Prince George Avenue3583%
    South Lodge Drive3274%
    Old Park Ridings2964%
    The Chine2966%
    Beech Hill Avenue2876%
    Chase Road2856%
    Lakenheath2870%
    Lancaster Avenue2877%
    Winchmore Hill Road2875%
    Conway Road2778%
    Merryhills Drive2785%
    Derwent Road2573%
    Woodland Way2567%

    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

    Where a roof can still use the national rules

    Outside those layers the national rules are tight for this roof form. Class B requires the original eaves to be maintained or reinstated, which a parapet-fronted mansard normally removes.

    The extra-storey route has limits of its own. Class AA additional storeys exclude houses built before 1 Jul 1948 or after 28 Oct 2018. Class AA is not available on article 2(3) land, which takes in conservation areas, so a mansard inside one means a householder planning application.

    Figures from Enfield's published decisions

    Enfield decided 934 householder applications in its published figures and granted 83.4%. Prior approvals for larger home extensions ran at 35 granted and 27 refused. For upward extensions the statistics show 0 granted and 0 refused.

    Sheets, notices and fees

    Each sheet sets the surveyed roof beside the proposal: plans, a section through the new floor, and front and rear elevations that take in the adjoining roofs. A mansard on a terrace usually rests on a shared wall, and the Party Wall etc. Act 1996 sets the notice: Party structure notice at least 2 months before work. The new floor also has to meet the fire rule: 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 householder fee of £548 goes to the council. If a lower floor is planned as well, basement conversion drawings in Enfield covers that application.

    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

    Upper floors of a large yellow-brick Victorian house in London with chimney potsFlat conversions & change of use
    Photograph: Lorenc Memaga
    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

    Does an Article 4 direction stop a mansard in Enfield?

    It removes permitted development rights, so the roof needs a planning application, which is the usual route for a mansard anyway. We read the direction maps against your address in the free constraints check.

    Can I add a storey under permitted development in Enfield?

    Only if the house meets the Class AA limits and sits outside the protected land the rule excludes, which takes in conservation areas. A mansard also normally removes the original eaves that Class B wants kept, so planning permission is the usual route.

    What insulation does a new Enfield roof need?

    New elements in existing dwellings follow the Part L limits, which for a roof read: New elements in existing dwellings, limiting U-values W/(m²·K): roof 0.15, wall 0.18, floor 0.18, windows 1.4 (or WER Band B), doors 1.4. The sections we draw carry the build-up.

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

    83.4%

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

    Photograph: Tanya Barrow

    09Further reading

    Other services in Enfield

    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 Enfield