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

01Hammersmith & Fulham, London

Mansard roof drawings in Hammersmith and Fulham

In Brook Green the character profile asks for existing rooflines to be left alone, and a mansard rebuilds the roof, so the first job is to find out which of the borough's conservation areas your house sits in. We draw the roof to those tests, from £845 with VAT included.

From £845 (VAT included)

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    02The brief

    Brook Green: what the character profile says about roofs

    The Brook Green profile is direct about roofs. Front roof extensions are generally unacceptable unless the terrace is already significantly impaired by them. Existing rooflines should not be disturbed; raising ridges or eaves is discouraged.

    Directions back the profile up. LBHF lists three Article 4 Directions for Brook Green (Nos. 1 to 3). Their scope reaches the roof: Article 4 Directions made in October 1977, November 1982 and December 1984 remove permitted development rights for many Brook Green buildings to alter front roofs and gables and front elevations, create hard standings, alter boundary walls, paint brickwork and stucco, or add a porch. A mansard here means checking each of those before any design option is shown.

    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 Hammersmith & Fulham

    Figures with their unit, period and source
    MeasureValuePeriodSource
    Conservation areas47 named conservation areas published by the councilNo periodplanning.data.gov.uk
    Listed building entries268 list entries (Historic England, within the LPA boundary)No periodplanning.data.gov.uk
    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 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

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

    Hammersmith & Fulham6 neighbouring councils
    Councils bordering Hammersmith & Fulham

    04The streets

    Householder applications by street in Hammersmith & Fulham

    Streets in Hammersmith & Fulham with the most householder applications, and the share approved
    StreetApplicationsApproved
    Carthew Road2396%
    Rylett Crescent2296%
    Emlyn Road21100%
    Orbain Road19100%
    Quarrendon Street19100%
    Rannoch Road1994%
    St Maur Road1994%
    St Dionis Road18100%
    Gowan Avenue1781%
    Walham Grove1777%
    Banim Street16100%
    Doneraile Street16100%
    Felden Street1693%
    Mendora Road1692%
    Ravenscourt Road16100%

    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

    Beyond Brook Green: the borough's layers

    Hammersmith and Fulham designates 47 conservation areas, and the national list holds 268 entries in the borough. The council does not publish one borough-wide roof figure that we hold on file, so each street is read from its own profile.

    In Fulham the council names the areas with Article 4 directions: LBHF publishes Article 4 Directions for Fulham conservation areas including Bishops Park (1 and 2), Central Fulham (1 and 2), Fulham Park Gardens, Hurlingham, Parsons Green (1 to 3), Walham Grove (1 and 2) and Studdridge Street (1 and 2). Our Fulham conservation area guide and Brook Green guide set out the local detail. A listed house needs a second application, covered by listed building consent drawings in Hammersmith and Fulham.

    Why permitted development does not reach a Brook Green roof

    For many Brook Green houses the Article 4 directions already remove the right to alter front roofs and gables. The national routes for a mansard close the remaining doors. Class B requires the original eaves to be maintained or reinstated, which a parapet-fronted mansard normally removes. Class AA adds its own limits: 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.

    A mansard here is a planning application for the council to decide, and the council's householder fee is £548.

    The sheets: roofline, stair and shared walls

    Because the profile protects the roofline, the sheet that matters is the elevation of the whole terrace with your roof marked on it, beside the sections through the stair and the party walls. The set is priced from £845, VAT included.

    Shared roofs bring a notice duty: Party structure notice at least 2 months before work. The new floor needs a protected escape route and enough stair headroom. 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). 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). The route for period roofs across London is on the mansard roof drawings hub.

    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

    Can I raise the ridge or eaves of a Brook Green house?

    The character profile discourages it: Existing rooflines should not be disturbed; raising ridges or eaves is discouraged. We check the Brook Green Article 4 directions before suggesting any change to the roof.

    Is a mansard allowed in Fulham conservation areas?

    There is no blanket answer. Each area has its own profile and some have Article 4 directions, and a mansard changes the roofline those documents protect. We read the profile for your street in the free constraints check.

    What if other houses on my Fulham terrace already have front roof extensions?

    Each Fulham conservation area has its own profile, so we read the one for your street. As a guide, the Brook Green profile next door treats front roof extensions as generally unacceptable unless the terrace is already significantly impaired by them. A terrace of untouched roofs and one with several extensions are treated differently, so we record the whole group on the survey.

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

    47

    named conservation areas published by the council

    Conservation areas, Hammersmith & Fulham. Source: planning.data.gov.uk

    Photograph: Tanya Barrow

    09Further reading

    Other services in Hammersmith & Fulham

    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 Hammersmith and Fulham