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Bright finished basement room with a glass-balustrade staircase, high windows and a built-in desk
Photograph: Point3D Commercial Imaging Ltd.

01Barking and Dagenham, London

Basement conversion drawings in Barking and Dagenham: Becontree houses and the flood map

Most homes here are houses, and a rear basement is the obvious way to add a room without losing the garden. The Local Plan then draws a line: basements are not permitted in Flood Zone 3b. Which side of that line your street sits on decides the whole job, so we settle it before quoting from £1,995 including VAT.

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    02The brief

    Where the Local Plan stops a basement

    The Barking and Dagenham 2037 Local Plan, adopted in 2024, treats basements as inappropriate in the highest-risk flood zone and restricts their use and design in the next two zones down. The strategic flood risk assessment holds the detail. Away from those zones the ordinary tests of design, drainage and neighbours apply.

    The council has no separate basement SPD that we could find. Its extension guidance is the Residential Extensions and Alterations SPD, so the Local Plan policy is the rule to draw to.

    Rear view of brick terraced houses in London with slate roofs and chimney stacks along the shared roofline
    Brick house being extended, with a wide new opening supported over the ground floor
    Photograph: Brett Jordan

    03The record

    Local figures for Barking and Dagenham

    Figures with their unit, period and source
    MeasureValuePeriodSource
    Basements are not appropriate in Flood Zone 3b; use and design restricted in Zones 2 and 3a per SFRA section 7.not permitted in Flood Zone 3bNo periodlbbd.gov.uk, Barking and Dagenham Local Plan 2020-2037 (adopted 2024), Policy DMSI 6(5)
    Approved Document B Vol 1, para 2.16Basement storeys with habitable rooms need an escape window or external door, or a protected stair to a final exitNo periodgov.uk
    Householder: alterations/extensions to a single dwellinghouse, from 1 Apr 2026548 GBPNo periodribblevalley.gov.uk
    Local planBarking and Dagenham 2037 Local PlanNo periodlbbd.gov.uk
    Supplementary planning documentBecontree Estate SPD and Design Code2026lbbd.gov.uk
    Households living in a house68.8 % of households living in a house or bungalow (detached, semi-detached or terraced)Census 2021nomisweb.co.uk
    Domestic gardens share of land (GLUD 2005)22.8 % of land that is domestic garden (GLUD 2005)2005data.london.gov.uk
    Listed building entries49 list entries (Historic England, within the LPA boundary)No periodplanning.data.gov.uk
    Conservation areas4 named conservation areas published by the councilNo periodplanning.data.gov.uk
    Article 4 directions3 Article 4 directions published by the councilNo periodplanning.data.gov.uk
    Householder applications granted66.5 %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.

    Barking and Dagenham4 neighbouring councils
    Councils bordering Barking and Dagenham

    04The streets

    Householder applications by street in Barking and Dagenham

    Streets in Barking and Dagenham with the most householder applications, and the share approved
    StreetApplicationsApproved
    Westrow Drive5162%
    Upney Lane3579%
    Beccles Drive3467%
    Lyndhurst Gardens2862%
    Blake Avenue2270%
    Western Avenue2250%
    Salisbury Avenue2174%
    Lichfield Road1956%
    Melford Avenue1975%
    Rugby Road1958%
    East Road1861%
    Fanshawe Crescent1871%
    Marston Avenue1872%
    Sandringham Road1871%
    Woodbridge Road1869%

    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 basement in sectionA, Party wall notice for excavation: Adjacent excavation notice at least 1 month before work: within 3 m and deeper than the neighbour's foundations, or within 6 m and cutting a 45° line from their foundations. B, Escape from basement rooms: Basement storeys with habitable rooms need an escape window or external door, or a protected stair to a final exitAB

    A basement in section

    A house and garden over a single-storey basement. The lettered marks show the limits the legend gives.

    A Party wall notice for excavation
    Adjacent excavation notice at least 1 month before work: within 3 m and deeper than the neighbour's foundations, or within 6 m and cutting a 45° line from their foundations
    B Escape from basement rooms
    Basement storeys with habitable rooms need an escape window or external door, or a protected stair to a final exit
    The basement in three dimensions3D
    Scroll the page: the model turns with it.

    06The detail

    Becontree and the family house

    Houses and bungalows make up 68.8% of households here, and private gardens cover 22.8% of the land in the GLA's older land-use survey. A lot of those houses belong to the Becontree estate, which has its own Becontree Estate SPD and Design Code.

    We hold no basement rule from that document, but a lightwell is visible from the street, so we read the design code before we place one. Habitable basement rooms also need a way out: Basement storeys with habitable rooms need an escape window or external door, or a protected stair to a final exit.

    A listed or conserved house below ground

    Listed houses are few: the borough holds 49 list entries, with 4 conservation areas and 3 Article 4 directions on top. A basement under any of them needs the heritage question answered first.

    Where consent is needed as well as permission, the route is in listed building consent drawings in Barking and Dagenham.

    What the council is likely to do with your application

    The council grants 66.5% of its householder applications, so the drawings have to carry the argument. We dimension the excavation, the lightwell and the drain run on the sheets the case officer will open first.

    Digging beside a neighbour also brings in the Party Wall etc. Act 1996, and the council's own householder fee is £548, paid direct. A roof storey on the same house is a separate application, covered under mansard roof drawings in Barking and Dagenham. To compare how other councils set their limits, use the basement conversion 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

    Georgian brick terrace with sash windows, arched fanlight doorways, stone steps and iron railings in LondonListed building consent
    Photograph: Lorenc Memaga
    Structural calculation sheet for a steel beam over a new rear opening, with the load diagram, loading table and section checks
    Sample drawing. Beam B1 over a new rear opening: loading, bending moment and section checks.

    08Correspondence

    Questions

    How do I find out whether my Dagenham street is in a flood zone that rules out a basement?

    The Environment Agency publishes a flood map for planning, and the council's strategic flood risk assessment adds detail. We read both at the free constraints check and tell you before we quote whether the policy closes the door.

    Does a Becontree house need anything special for a basement?

    The estate has its own design code, and anything visible from the street, such as a lightwell, is read against it. Inside the house the usual Building Regulations apply.

    Is it harder to get householder permission in Barking and Dagenham?

    The council's grant rate is 66.5% of householder decisions in the latest year of statistics. Clear, complete drawings give the officer less to query, which is what we aim for.

    Rows of brick terraced houses and gardens on a residential street

    66.5%

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

    Photograph: Altaf Shah

    09Further reading

    Other services in Barking and Dagenham

    Basement conversion 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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    Basement conversion drawings in Barking and Dagenham