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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.

01Enfield, London

Basement conversion drawings for Enfield homes

The London Plan asks boroughs to set policies on large-scale basements where they are a local issue, and our data holds none for Enfield. We therefore draw to the national rules, the garden you have to keep and the heritage controls on your street, from £1,995 including VAT.

From £1,995 (VAT included)

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    02The brief

    Policy: what London asks and Enfield's data shows

    The London Plan's basements policy reads: Boroughs should set policies on large-scale basements where this is a local issue. We found no published Enfield basement policy in our data, so we state that plainly and do not borrow another borough's limits.

    Without a local cap on size or depth, the practical tests are structural safety, the neighbours and the street, and every one of them has to be shown on the drawings.

    Georgian brick terrace with sash windows, arched fanlight doorways, stone steps and iron railings in London
    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 Enfield

    Figures with their unit, period and source
    MeasureValuePeriodSource
    London Plan 2021 Policy D10(A)Boroughs should set policies on large-scale basements where this is a local issueNo periodlondon.gov.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
    Party Wall etc. Act 1996 s5, s6(7)A dispute arises if the adjoining owner does not consent within 14 days of the noticeNo 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
    Approved Document B Vol 1, paras 1.1-1.2All dwellings: fire detection and alarm system minimum Grade D2 Category LD3 (BS 5839-6), mains-operated smoke alarms to BS EN 14604No periodgov.uk
    Householder: alterations/extensions to a single dwellinghouse, from 1 Apr 2026548 GBPNo periodribblevalley.gov.uk
    CIL Regulations 2010 reg 42(1)-(2)No CIL where new build gross internal area is under 100 m², unless one or more dwellings are createdNo periodlegislation.gov.uk
    Domestic gardens share of land (GLUD 2005)21.7 % of land that is domestic garden (GLUD 2005)2005data.london.gov.uk
    Conservation areas24 named conservation areas published by the councilNo periodplanning.data.gov.uk
    Article 4 direction areas33 Article 4 direction area polygons published by the councilNo periodplanning.data.gov.uk

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

    Enfield7 neighbouring councils
    Councils bordering Enfield

    04The streets

    Householder applications by street in Enfield

    Streets in Enfield with the most householder applications, and the share approved
    StreetApplicationsApproved
    Lonsdale Drive4385%
    Wynchgate3784%
    Prince George Avenue3583%
    South Lodge Drive3274%
    Old Park Ridings2964%
    The Chine2966%
    Beech Hill Avenue2876%
    Chase Road2856%
    Lakenheath2870%
    Lancaster Avenue2877%
    Winchmore Hill Road2875%
    Conway Road2778%
    Merryhills Drive2785%
    Derwent Road2573%
    Woodland Way2567%

    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

    Gardens, conservation areas and listed houses

    Domestic gardens account for 21.7% of Enfield's land in the Greater London land-use data. A basement under the lawn removes soil depth, which matters for drainage and planting, so we draw the garden above the slab in section.

    The borough has 24 conservation areas and 33 Article 4 direction areas. A listed house also needs consent for any excavation that affects it, as set out in listed building consent drawings in Enfield.

    Neighbours, escape and fire safety

    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. The dispute rule follows: A dispute arises if the adjoining owner does not consent within 14 days of the notice.

    On fire safety: 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.

    Fees and the roof above

    The householder fee is £548 to the council, separate from our fixed fee. On CIL: No CIL where new build gross internal area is under 100 m², unless one or more dwellings are created. Residential extensions and annexes can claim exemption (claim before commencement).

    Planning a loft as well? The roof rules are in mansard roof drawings in Enfield. The wider list of areas we cover sits on the areas index.

    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

    Brick house being extended, with a wide new opening supported over the ground floorStructural calculations
    Photograph: Brett Jordan
    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

    Does Enfield have a basement policy?

    We found none in our data. The London Plan's basements policy asks boroughs to set one where basements are a local issue, so check with us: the free constraints check looks at your address and the council's current documents.

    Is a basement permitted development in Enfield?

    A basement is a substantial excavation and normally needs planning permission. Whether yours does depends on the house, the street and any Article 4 direction, which we check before quoting.

    What is the fixed fee?

    From £1,995 including VAT for the drawings. Structural calculations and council fees are separate.

    Rows of brick terraced houses and gardens on a residential street

    21.7%

    of land that is domestic garden (GLUD 2005)

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

    Photograph: Altaf Shah

    09Further reading

    Other services in Enfield

    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 Enfield