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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.

01Redbridge, London

Basement conversion drawings in Redbridge

Redbridge states its basement limits in one place, the Housing Design SPD, and they cover extent, depth, soil cover and front lightwells. We draw to all four from £1,995 including VAT, and coordinate the structural engineer who prepares the required impact assessment.

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    02The brief

    The limits, in the council's short form

    The Housing Design Guide SPD limits a basement in this form: 50% rear garden; 30% front; single storey; 1 m soil. Under the rear garden that is a set share of its area, a smaller share at the front, a single storey down and a layer of permeable soil above.

    The application needs more than drawings. The SPD's second rule reads: BIA required; front lightwell 1 m. The assessment is prepared by a qualified structural engineer with a construction method statement, and Local Plan policy applies alongside it, so the impact assessment is a commissioned document, not an add-on.

    Brick house being extended, with a wide new opening supported over the ground floor
    Georgian brick terrace with sash windows, arched fanlight doorways, stone steps and iron railings in London
    Photograph: Lorenc Memaga

    03The record

    Local figures for Redbridge

    Figures with their unit, period and source
    MeasureValuePeriodSource
    Basements must not extend under the rear garden beyond 50% of the garden (30% to the front), keep 1 m permeable soil above, and be no more than a single storey below ground.50% rear garden; 30% front; single storey; 1 m soilNo periodredbridge.gov.uk, Redbridge Housing Design SPD (Sept 2019), p.22, para 4.1.4
    A Basement Impact Assessment (by a qualified structural engineer) with Construction Method Statement is required for every basement application; Local Plan policy LP31 applies; front lightwells no more than 1 m deep.BIA required; front lightwell 1 mNo periodredbridge.gov.uk, Redbridge Housing Design SPD (Sept 2019), pp.22-23, paras 4.1.1, 4.1.3, 4.1.5, 4.2.2
    Supplementary planning documentHousing Design Guide SPD2019redbridge.gov.uk
    Domestic gardens share of land (GLUD 2005)27.4 % of land that is domestic garden (GLUD 2005)2005data.london.gov.uk
    Green Belt share of the council area34 % of council area covered by green-belt polygonsNo periodplanning.data.gov.uk
    Conservation areas16 named conservation areas published by the councilNo periodplanning.data.gov.uk
    Households living in a house66.2 % of households living in a house or bungalow (detached, semi-detached or terraced)Census 2021nomisweb.co.uk
    Party Wall etc. Act 1996 s6(1), s6(2), s6(5)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 foundationsNo periodlegislation.gov.uk
    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

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

    Redbridge5 neighbouring councils
    Councils bordering Redbridge

    04The streets

    Householder applications by street in Redbridge

    Streets in Redbridge with the most householder applications, and the share approved
    StreetApplicationsApproved
    Wensleydale Avenue3773%
    Kings Avenue3371%
    Gyllyngdune Gardens3239%
    Malford Grove3171%
    Wanstead Park Avenue2989%
    Broadwalk2791%
    Falmouth Gardens2788%
    Levett Gardens2758%
    Beehive Lane2548%
    Goodmayes Lane2471%
    High View Road2483%
    Woodlands Avenue2486%
    Beattyville Gardens2378%
    Bressey Grove2386%
    Monkhams Avenue2386%

    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, Redbridge: depth and garden share: 50% rear garden; 30% front; single storey; 1 m soil. B, 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. C, Escape from basement rooms: Basement storeys with habitable rooms need an escape window or external door, or a protected stair to a final exitABC

    A basement in section

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

    A Redbridge: depth and garden share
    50% rear garden; 30% front; single storey; 1 m soil
    B 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
    C 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

    Garden land the rules act on

    Domestic gardens cover 27.4% of Redbridge's land in the GLA data, and every share in the SPD is taken from the garden as it really is. We measure it at survey and show the basement footprint against each limit.

    The Green Belt covers 34% of the borough, and a house inside it is tested under that policy as well. The constraints check places your plot before design starts.

    Shared walls and the Redbridge semi

    66.2% of Redbridge households live in a house or bungalow, so many basements here are dug beside a semi-detached or terraced neighbour. 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. A dispute arises if the adjoining owner does not consent within 14 days of the notice.

    The SPD caps the depth of a front lightwell, so we test the escape route early, asking whether an escape window can open onto it or the exit must go elsewhere. Basement storeys with habitable rooms need an escape window or external door, or a protected stair to a final exit. All dwellings: fire detection and alarm system minimum Grade D2 Category LD3 (BS 5839-6), mains-operated smoke alarms to BS EN 14604.

    Heritage and the householder record

    Redbridge publishes 16 conservation areas, and Historic England records 134 list entries. A basement under a listed house needs consent as well as permission, as set out in listed building consent drawings in Redbridge. A new roof storey on the same house is covered by mansard roof drawings in Redbridge, and the basement conversion drawings hub gives the general route.

    The council decided 991 householder applications in the latest return, 82.8% granted. Submitting one costs £548, payable to the council.

    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
    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 big can a basement be in Redbridge?

    In short form the SPD limits it to 50% rear garden; 30% front; single storey; 1 m soil. We read the rule against your plot at survey and draw the footprint to it.

    Do I need a basement impact assessment?

    Yes. BIA required; front lightwell 1 m. We coordinate the structural engineer who writes it.

    Does my neighbour need to be told?

    A party wall notice is needed when the dig falls inside the set distances. A dispute arises if the adjoining owner does not consent within 14 days of the notice. On one plan we draw the shared boundary, the semi's foundation line and the edge of the pit, and that is the sheet your notice goes out with.

    Rows of brick terraced houses and gardens on a residential street

    27.4%

    of land that is domestic garden (GLUD 2005)

    Domestic gardens share of land (GLUD 2005), Redbridge, 2005. Source: data.london.gov.uk

    Photograph: Altaf Shah

    09Further reading

    Other services in Redbridge

    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 Redbridge: SPD limits