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

01Wandsworth, London

Mansard roof drawings in Wandsworth

Wandsworth's Housing SPD gives a number for the rear mansard on a mid-terrace. We draw to it: full-width between the party walls, the pitch the council names, and dormers for light, so the roof reads as it is meant to in the guidance.

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    02The brief

    The pitch the Housing SPD names

    The Housing SPD says a full-width rear mansard between built-up party walls works well on mid-terraced houses at 70 degrees, lit by traditional dormers rather than a vertical rear face. It is guidance, not a fixed limit, but it tells us which geometry the officers have in mind before the first sketch.

    The SPD covers rear extensions, basements, roof extensions and loft conversions together (Housing SPD (covers rear extensions, basements, roof extensions and loft conversions)), so it is the one document we read in full for any roof. The borough's Local Plan is the Wandsworth Local Plan 2023-2038. Wider context is on the mansard roof drawings hub.

    Brick cottage with a tiled roof, chimneys and a front dormer window
    Upper floors of a large yellow-brick Victorian house in London with chimney pots
    Photograph: Lorenc Memaga

    03The record

    Local figures for Wandsworth

    Figures with their unit, period and source
    MeasureValuePeriodSource
    A full-width rear mansard between built-up party walls works well with a 70 degree pitch on mid-terraced houses, lit by traditional dormers rather than a vertical rear face.70 degreesNo periodwandsworth.gov.uk, Housing SPD 2016, pp.75-76, para 4.152 and caption
    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 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)No periodgov.uk
    Conservation areas46 named conservation areas published by the councilNo periodplanning.data.gov.uk
    Listed building entries312 list entries (Historic England, within the LPA boundary)No periodplanning.data.gov.uk
    Householder decisions977 decisions1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications granted91.9 %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.

    Wandsworth7 neighbouring councils
    Councils bordering Wandsworth

    04The streets

    Householder applications by street in Wandsworth

    Streets in Wandsworth with the most householder applications, and the share approved
    StreetApplicationsApproved
    Earlsfield Road2889%
    Dover House Road2774%
    Broomwood Road2692%
    Sutherland Grove2682%
    Elborough Street2592%
    Elsenham Street2591%
    Elsley Road24100%
    Wakehurst Road2490%
    Deodar Road2289%
    Huntingfield Road2291%
    Mallinson Road2291%
    Thurleigh Road22100%
    Engadine Street21100%
    Magdalen Road2180%
    Burntwood Lane2089%

    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, Wandsworth: lower slope: 70 degrees. B, Permitted development and the eaves: Class B requires the original eaves to be maintained or reinstated, which a parapet-fronted mansard normally removes. C, Additional storeys under permitted development: Class AA additional storeys exclude houses built before 1 Jul 1948 or after 28 Oct 2018. D, 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)ABCD

    A mansard roof in section

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

    A Wandsworth: lower slope
    70 degrees
    B Permitted development and the eaves
    Class B requires the original eaves to be maintained or reinstated, which a parapet-fronted mansard normally removes
    C Additional storeys under permitted development
    Class AA additional storeys exclude houses built before 1 Jul 1948 or after 28 Oct 2018
    D 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

    What the pitch does not settle

    A pitch does not decide whether a mansard suits your street. The borough publishes 46 conservation areas and 312 list entries, so we check both for your street before drawing.

    Permitted development seldom covers it either. Class B requires the original eaves to be maintained or reinstated, which a parapet-fronted mansard normally removes. A new storey above an older house is limited too: 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.

    Party structure, stairs, fire and insulation

    Building Regulations decide the rest. Party structure notice at least 2 months before work. Loft 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). 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).

    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.

    Householder record and fee

    In its latest figures the council decided 977 householder applications, granted 91.9% and decided 92.4% within eight weeks or an agreed extension. These cover all householder work, so they say nothing certain about a roof. The council's householder fee is £548, paid separately from our fixed fee of £845 including VAT.

    A listed house needs consent first: see listed building consent drawings in Wandsworth. For a cellar under the same house, see basement conversion drawings in Wandsworth.

    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

    Rear view of brick terraced houses in London with slate roofs and chimney stacks along the shared rooflineParty wall services
    Photograph: Ben Hadfield
    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

    What pitch does Wandsworth want on a rear mansard?

    The Housing SPD says a full-width rear mansard on a mid-terraced house works well at 70 degrees, lit by traditional dormers. It is a guide for officers, not a fixed limit.

    Do I need a party structure notice for a mansard?

    Usually. Party structure notice at least 2 months before work. We can prepare the drawings that go with it.

    What do mansard drawings cost in Wandsworth?

    Drawings start from £845 including VAT, and we fix the quote once we have looked at your street's conservation and listing status, which costs nothing. Wandsworth's householder fee is a separate payment to the council.

    Converted loft bedroom with roof windows and a Juliet balcony

    91.9%

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

    Photograph: Imad Clicks

    09Further reading

    Other services in Wandsworth

    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 Wandsworth