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Islington, London

Daylight and sunlight report in Islington

Islington asks for a daylight and sunlight assessment on all new major residential proposals and wherever a scheme may have an adverse effect on a neighbour's light, including gardens and amenity space. The council's list cites the BRE guide as BRE (2021 per the list). In a borough of flats and tight terraces, that second limb catches many small projects.

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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 daylight and sunlight reports

    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 the validation list says

    The Local Validation Requirements for Planning Applications set out the daylight and sunlight item as its own item, and the wording has two triggers. The first is automatic: any new major residential proposal. The second depends on effect: any scheme where there may be an adverse impact on neighbouring daylight or sunlight, including gardens or amenity space.

    The list adds a line aimed at tight sites. In restricted settings the assessment must also cover the final values within the proposed scheme, so the new rooms are tested as well as the old neighbours. A basement flat or a rear room lit through a lightwell is the usual example.

    We read that line as a prompt to model both directions of effect from the start. Doing so costs little extra, since the same 3D model serves both.

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

    Local figures for Islington

    Figures with their unit, period and source
    MeasureValuePeriodSource
    Daylight/sunlight assessment required for all new major residential proposals and where there may be adverse impact on neighbours' daylight/sunlight including gardens or amenity space; follow BRE 'Site layout planning for daylight and sunlight: A guide to good practice' (2021); in restricted settings also cover the final values within the proposed scheme.BRE (2021 per the list)—islington.gov.uk, Islington Local Validation Requirements for Planning Applications (12 April 2024), Item 3.2, p.14
    Conservation areas41 named conservation areas published by the council—planning.data.gov.uk
    Listed building entries1,050 list entries (Historic England, within the LPA boundary)—planning.data.gov.uk
    Grade II listed entries1,002 list entries—planning.data.gov.uk
    Households living in a house16.3 % of households living in a house or bungalow (detached, semi-detached or terraced)Census 2021nomisweb.co.uk
    Owner-occupied households26.7 % of households owner-occupied (owned outright or with mortgage/loan)Census 2021nomisweb.co.uk
    Average price, terraced1,151,398 GBP2026-07publicdata.landregistry.gov.uk
    Householder decisions337 decisions1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications granted92.6 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications decided in time98.8 % decided within 8 weeks or an agreed extended period1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Minor applications granted86.5 %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 Islington
    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

    Flats and terraces on tight plots

    Only 16.3 per cent of Islington households live in a house or bungalow, and 26.7 per cent own their home. Most projects here are an extension or alteration to a flat or a terrace, beside neighbours whose rear windows already look onto a narrow yard.

    Light studies in tight terraces are sensitive to small changes. A rear infill that adds a few courses of brickwork can move a neighbour's lower window from a comfortable result to a marginal one. We therefore test several massing options in the model before any are drawn up in detail, and we pass on the variant that costs the neighbour least.

    Heritage in great quantity

    Islington has 41 conservation areas, and Historic England lists 1,050 entries inside the boundary, of which 1,002 are Grade II and 34 Grade II*. A listed terrace can mean the roof, the party walls and the rear elevation are all protected.

    That has a direct effect on the light work. The standard remedy for a failed result, lowering or setting back the new element, may not be available, and the report has to explain why the proposed form is the best the heritage constraint permits.

    Basements and lightwells

    Islington publishes a Basement Development SPD as well as the Islington Urban Design Guide SPD. Basement schemes bring their own light questions, because a new lightwell or an enlarged garden-level room changes both the new room's daylight and the neighbour's view of the garden. Where a basement is involved, our basement impact assessment in Islington covers the ground and water side separately.

    The two documents can be read together. The light study shows what each room receives, and the basement assessment shows that the ground can safely be excavated.

    The householder and minor record

    The council decided 337 householder applications in the latest published year and granted 92.6 per cent, with 98.8 per cent decided in time. Minor schemes, a larger group at 675 decisions, were granted at 86.5 per cent.

    Terraced houses averaged £1,151,398 in the latest figures, which helps explain why objections are well argued. The Islington Local Plan, adopted in 2,023, is the policy backdrop.

    Planning the work around the neighbours

    In a terrace the neighbours on both sides matter, and so does the flat above or below. We survey every opening that could be affected, including rear windows on upper floors, and treat shared lightwells as a single space. Where the result is close, we show the neighbour's side of the argument as fairly as our own, because an officer who sees a balanced report is more likely to trust its conclusion.

    Related pages

    Our overall guide to daylight and sunlight reports covers the tests, planning drawings in Islington covers the drawings, and the borough page is architectural drawings in Islington. The rules next door can differ, so compare Hackney and Camden.

    We agree a fixed fee after a free look at your address.

    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 Islington

    Daylight and sunlight reports nearby

    Questions

    When does Islington require a daylight and sunlight report?

    On all new major residential proposals, and wherever there may be an adverse effect on neighbours' light, including gardens. The list cites BRE (2021 per the list).

    What is meant by restricted settings?

    On tight sites the list asks the assessment to cover final values within the proposed scheme as well, so the new rooms are tested too.

    Does a basement change the report?

    It can, through new lightwells. The council has a Basement Development SPD, and ground and water questions are covered in a separate assessment.

    How many listed buildings does Islington have?

    Historic England records 1,050 entries inside the borough boundary.

    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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