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

01Waltham Forest, London

Mansard roof drawings for Waltham Forest houses

A mansard is the unusual request in Waltham Forest. The council's Residential Alterations and Retrofit SPD says mansards are not a typical roof profile in the borough, so an application has to earn its place with a roof that belongs to the street. We draw that case in section and elevation, from £845 including VAT.

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    02The brief

    Why the council starts from doubt

    The SPD is plain about it. Mansards are unlikely to be appropriate here, and may be supported only where they reflect local character and show exemplar design. That is a high bar, and we would rather say so at the first call than after you have paid for a scheme.

    It also tells us what the drawings must do. They have to show the roof against its neighbours, with the existing ridge, eaves and chimney line drawn beside the proposal, so an officer can judge whether a taller roof fits the row. The wider reasoning is on the mansard roof drawings hub.

    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 Waltham Forest

    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
    Dormers set in at least 0.25 m from ridge and eaves and at least 0.5 m from the roof sides, in proportion to the roof; front dormers typically not supported.0.25 m ridge and eaves; 0.5 m sidesNo periodwalthamforest.gov.uk, Waltham Forest Residential Alterations and Retrofit SPD (adopted June 2026), p.43, paras 7.9.10-7.9.11
    Supplementary planning documentResidential Alterations and Retrofit SPD2026walthamforest.gov.uk
    Local planLocal Plan Part 1: Shaping the Borough 2020-2035No periodwalthamforest.gov.uk
    Green Belt share of the council area22 % of council area covered by green-belt polygonsNo periodplanning.data.gov.uk
    Listed building entries118 list entries (Historic England, within the LPA boundary)No periodplanning.data.gov.uk
    Grade II* listed entries13 list entriesNo periodplanning.data.gov.uk
    Heritage at Risk entries16 Heritage at Risk Register entries within the LPA boundary (Historic England)No periodplanning.data.gov.uk
    Article 4 directions15 Article 4 directions published by the councilNo periodplanning.data.gov.uk
    Article 4 direction areas807 Article 4 direction area polygons published by the councilNo periodplanning.data.gov.uk
    Conservation areas15 named conservation areas published by the councilNo periodplanning.data.gov.uk
    Householder decisions771 decisions1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications granted81.5 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications decided in time90.7 % decided within 8 weeks or an agreed extended period1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Households living in a house55.1 % of households living in a house or bungalow (detached, semi-detached or terraced)Census 2021nomisweb.co.uk

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

    Waltham Forest6 neighbouring councils
    Councils bordering Waltham Forest

    04The streets

    Householder applications by street in Waltham Forest

    Streets in Waltham Forest with the most householder applications, and the share approved
    StreetApplicationsApproved
    Browning Road2282%
    Blenheim Road1667%
    Ulverston Road1455%
    Capworth Street1364%
    Clacton Road1255%
    St Johns Road1267%
    The Avenue1191%
    Grange Park Road10100%
    Murchison Road1088%
    Oakdale Road1070%
    Sky Peals Road1075%
    Woodberry Way1063%
    Albert Road975%
    Badlis Road989%
    Colchester Road956%

    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

    A borough of houses, and the roofs above them

    55.1% of households here live in a house or bungalow, and 22% of the council area is covered by green-belt polygons, so sideways growth is not always open to owners. The borough's Local Plan Part 1: Shaping the Borough 2020-2035 sits behind those limits. A roof is often the one part of the house you can still grow.

    Heritage is thinly spread but real. Historic England records 118 list entries in the borough, 13 of them at Grade II*, and 16 entries sit on the Heritage at Risk Register. A listed house needs consent for roof work as well as planning, which we cover in listed building consent drawings in Waltham Forest.

    Reading the Article 4 map before the roof

    The council publishes 15 Article 4 directions, drawn on the national dataset as 807 separate areas, plus 15 conservation areas. Inside any of them, rights that would cover roof work can be withdrawn, so we read each direction for what it takes away on your street.

    Permitted development will not rescue most mansards. Class B requires the original eaves to be maintained or reinstated, which a parapet-fronted mansard normally removes. For an extra storey, note the date rule: 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.

    When a dormer is the better answer

    For many houses a rear dormer gets you the headroom with far less risk. The SPD sets dormers back from the roof edges: 0.25 m ridge and eaves; 0.5 m sides. We will tell you if a dormer gives you the room you need and a mansard does not add enough to justify the harder case.

    If you would rather find the room downwards than upwards, digging out a basement has its own rules, set out in basement conversion drawings in Waltham Forest.

    Party walls, fees and the local record

    Raising a party wall is notifiable work. Party structure notice at least 2 months before work, so the notice goes out early. The householder application fee is £548, separate from our fee, and free redraws apply if officers ask for changes.

    Across 771 householder decisions in the latest figures, the council granted 81.5% and decided 90.7% on time. Those numbers cover every kind of householder work, and say nothing about a mansard on your roof.

    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

    Will Waltham Forest support a mansard on my terrace?

    Not as a matter of course. The council's Residential Alterations and Retrofit SPD treats mansards as untypical, so one is supported only where it reflects local character and is of exemplar design. We test your terrace against that before you commit.

    Is a rear dormer easier to get through than a mansard here?

    Usually, because the SPD already describes how a dormer should sit: 0.25 m ridge and eaves; 0.5 m sides. A mansard has no such template, so it carries more judgement and more risk.

    Does living in a conservation area change the answer?

    Yes. The borough has 15 conservation areas, and Class AA is not available on article 2(3) land, so an extra storey there always needs a planning application.

    How far ahead must I tell my neighbour about a party wall?

    Party structure notice at least 2 months before work. Our notice fee is on the quote, and we draft the notice with the drawings.

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

    81.5%

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

    Photograph: Lorenc Memaga

    09Further reading

    Other services in Waltham Forest

    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 Waltham Forest