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Waltham Forest, London

Biodiversity net gain plan in Waltham Forest

In Waltham Forest a biodiversity net gain plan can matter on a garden-sized site, because 22 per cent of the borough is covered by green-belt polygons and 231 tree preservation orders protect its trees. The statutory gain is 10 per cent. We check your exemption first, then quote a fixed price after a free constraints check.

Fixed quote after a free constraints check

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    Architectural model of a four-storey London stucco townhouse in its terrace, with a portico, area railings, sash windows, a cornice and chimney stacks
    The house as it stands: four storeys over a lower ground floor.Existing Proposed worksAn illustrative model, built for this page.

    How we work on biodiversity net gain plans

    Seven steps from first call to approval.

    The same model cut through the middle: every floor, the stair, the chimney breasts, the new mansard, rear extension and basement in section
    Section through the model: every floor on one datum.

    1. Enquiry and constraints check

      We check the property against conservation areas, listed status, Article 4 directions, tree preservation orders, flood zone and planning history. We choose the right route and send a fixed quote.

    2. Measured survey

      We survey the house on one datum: rooms, levels, boundaries, drains, trees and the neighbours' windows that the 45° and 25° tests depend on.

    3. Design options

      We model the house in Revit and show you options in 3D and plan, with the planning strategy and the precedents in your street.

    4. Design frozen

      You choose an option in writing. Nothing changes after this without your say.

    5. Independent check

      A second chartered technologist checks every sheet against the council's validation checklist and the policy. A senior review signs it off before anything is submitted.

    6. Submission

      We prepare the forms, certificates, fee and documents and submit through the Planning Portal.

    7. Officer liaison

      We answer the planning officer and make any amendments within five working days, at no charge until approval.

    Free redraws until approval. Every drawing set is checked independently, and the checker is never the person who drew it.

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    Rows of brick terraced houses and gardens on a residential street

    What Waltham Forest asks for with a biodiversity net gain plan

    The council's local validation checklist restates the national information requirement for biodiversity gain, which is the metric calculation, the pre-development value and a statement on any degradation of the site. It then adds its own items for a biodiversity survey or report and for a net gain item. Our summary of what we read is: Statutory 10%; no higher local figure read. We have not read the two local items in detail, so we confirm their wording for your application before we prepare anything.

    The development plan is the Local Plan Part 1: Shaping the Borough 2020-2035, adopted in 2,024, and for work on an existing home the council's reference is the Residential Alterations and Retrofit SPD. Householder applications are exempt from the gain requirement, but the form still asks you to say why.

    In practice, the validation checklist is where a small scheme goes wrong. An application that ticks the wrong box, or omits a survey the council listed, is held back before an officer reads it.

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

    Local figures for Waltham Forest

    Figures with their unit, period and source
    MeasureValuePeriodSource
    The national requirement 6 restates the statutory biodiversity gain information (metric calculation, pre-development value, degradation statement); the local list also has a biodiversity survey/report (item 14) and a BNG item (15). No local percentage above the statutory 10% was read.Statutory 10%; no higher local figure read—walthamforest.gov.uk, Waltham Forest Local Validation Checklist 2025 (national and local, key changes highlighted), p.5, national requirement 6; local items 14-15 (not read in detail)
    Environment Act 2021 Sch 14 para 2, inserting Sch 7A TCPA 1990: 'relevant percentage' 10%10 %—legislation.gov.uk
    Sch 7A para 9(3) as inserted: enhancement maintained for at least 30 years after completion30 years—legislation.gov.uk
    Green Belt share of the council area22 % of council area covered by green-belt polygons—planning.data.gov.uk
    Tree preservation orders231 tree preservation orders published by the council—planning.data.gov.uk
    Tree preservation zones218 tree preservation zone polygons published by the council—planning.data.gov.uk
    Domestic gardens share of land (GLUD 2005)24.4 % of land that is domestic garden (GLUD 2005)2005data.london.gov.uk
    Conservation areas15 named conservation areas published by the council—planning.data.gov.uk
    Listed building entries118 list entries (Historic England, within the LPA boundary)—planning.data.gov.uk
    Householder applications granted81.5 %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.

    Councils bordering Waltham Forest
    Which application your project needsLawful Development Certificate decision: 8 weeks. Prior approval decision: 42 days. Householder decision: 8 weeksYour projectWithin permitted development?Lawful Development CertificatePrior approvalHouseholder applicationYesLarger rear extensionNoABC

    Which application your project needs

    The usual route for a house; flats and listed buildings follow other rules.

    A · Lawful Development Certificate decision
    8 weeks
    B · Prior approval decision
    42 days
    C · Householder decision
    8 weeks

    Green belt, trees and gardens in Waltham Forest

    Besides the green-belt share, gardens cover 24.4 per cent of the land, and 55.1 per cent of households live in a house. A rear garden is therefore a realistic site for a new home, and that is when the gain rule can apply.

    Waltham Forest lists 231 tree preservation orders and 218 protected zone polygons. A protected tree is worth habitat value in the metric and a constraint on the layout, so we map the trees before we draw a footprint.

    Sites of 0.2 hectares or below can fall outside the rule, and impacts under 25 square metres of habitat are excluded. Many single-plot schemes will sit below that line, but a woodland edge, a pond or an old hedgerow can bring a small site back into scope.

    Heritage and extensions beside the net gain duty

    Waltham Forest has 15 conservation areas, 15 Article 4 directions covering 807 mapped areas and 118 listed entries. A planting scheme in a conservation area is also a design question, and the landscape sheet should match the elevations.

    The council decided 771 householder applications in its latest year and granted 81.5 per cent, and larger home extension prior approvals ran at 31 granted against 87 refused. None of that work needs a gain plan, so the question is asked only of the minority of schemes that are not exempt.

    Our new build drawings in Waltham Forest include the landscape layout that a plan relies on, and the planning drawings in Waltham Forest carry the application.

    What a plan contains, and how long the gain lasts

    A plan starts from the metric calculation of the site's value before development, then the value after, parcel by parcel, using habitat type, area and condition. A habitat map and baseline survey sit beside it, and the gain must be maintained for at least 30 years.

    Small residential schemes can use the optional small sites metric, but not where priority habitat, protected sites or European protected species are present. We say at the free check whether yours qualifies.

    The gain can be delivered on site, through registered off-site units, or as a last resort by statutory credits. For non-major development, on-site and registered off-site routes now sit at the same level of preference, so a garden site has more freedom than it did.

    Price and nearby places

    A biodiversity net gain plan has no list price, because the scope depends on the habitats on the site. After the free check you receive a fixed quote, or a plain statement that an exemption applies.

    For the borough overview, see architectural drawings in Waltham Forest. To the south, Tower Hamlets has gardens on only 7.4 per cent of its land, and the national rules are on the biodiversity net gain plan hub.

    What you receive

    Planning drawing sheet for a rear extension with plans, elevations and sections
    Sample drawing. Planning drawings for a rear extension: plans, elevations and sections on one sheet set.
    Brick cottage with a tiled roof, chimneys and a front dormer window
    The street around you
    Move across the plinth — the blocks rise around the pointer.

    Other services in Waltham Forest

    Biodiversity net gain plans nearby

    Questions

    Does a Waltham Forest house extension need a biodiversity net gain plan?

    No. Householder applications are exempt, but the application form must still say why the condition does not apply.

    What does the council's validation checklist ask for?

    It restates the national gain information and adds local items for a biodiversity survey or report and for a net gain item. We confirm the wording for your application.

    Is a rear garden plot exempt?

    A site of 0.2 hectares or below is exempt unless priority habitat is affected, so many are, but a hedgerow, a pond or a protected tree can change the picture.

    What does a plan cost?

    A fixed quote after a free constraints check.

    Sources and dates

    City of London skyline glowing at dusk across the Thames under a dramatic orange sky

    Tell us about your property.

    We check the constraints, then send a fixed fee. Messages before 3pm get a reply the same working day.

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