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Bexley, London

Loft conversion drawings in Bexley

Loft conversion drawings for a Bexley house start at £695 including VAT. Bexley says in writing what shape of roof extension it prefers, and it granted 94.6 per cent of householder applications in its latest year, so a loft that follows the guide has a clear path.

From £695 (VAT included)

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  • Fixed fees, VAT included

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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 loft conversion drawings

    Nine 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.

    8. Building regulations

      Technical drawings are coordinated with the structural engineer's calculations, the drainage and the planning conditions.

    9. Approval and hand-over

      Building control approval, then a next-steps pack covering the commencement notice, party wall timing and CIL.

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

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    Rear view of brick terraced houses in London with slate roofs and chimney stacks along the shared roofline

    The roof shape Bexley's design guide asks for

    Bexley's Design and Development Control Guidelines SPD says a roof extension should not exceed the existing ridge height, that dormers should face the rear and sit back from the main wall, and that dormers on a hipped side are generally avoided. The council has since published Design Guide SPD Part 2: Building Alterations and Extensions and Design Guide SPD Part 1: Design Principles under the Bexley Local Plan, adopted in 2,023, and we read the roof against those too.

    Read together, those lines settle most of the design before a pencil moves, and they explain why Bexley loft drawings concentrate on the rear elevation and the roof section. A rear dormer tucked under the ridge fits. A dormer on a hip, or a scheme that lifts the ridge, begins with an argument you would have to win.

    On the rear elevation we dimension the set-back from the wall below, and on the section we draw the new ridge against the old one. The officer then sees both tests answered on the sheet.

    Slate-clad roof extension on a yellow-brick London terraced house

    Local figures for Bexley

    Figures with their unit, period and source
    MeasureValuePeriodSource
    Conservation areas23 named conservation areas published by the council—planning.data.gov.uk
    Listed building entries114 list entries (Historic England, within the LPA boundary)—planning.data.gov.uk
    Green Belt share of the council area17 % of council area covered by green-belt polygons—planning.data.gov.uk
    Households living in a house75.3 % of households living in a house or bungalow (detached, semi-detached or terraced)Census 2021nomisweb.co.uk
    Householder decisions877 decisions1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications granted94.6 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications decided in time99.4 % decided within 8 weeks or an agreed extended period1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    GPDO 2015 Sch 2 Pt 1 Class B, para B.1(d)40 m³ (terrace house) / 50 m³ (any other house) additional roof volume—legislation.gov.uk
    Class B, para B.1(c)No enlargement beyond the plane of a roof slope that forms the principal elevation and fronts a highway—legislation.gov.uk
    Class B, para B.1(b)No part higher than the highest part of the existing roof—legislation.gov.uk
    Class B, para B.1(f)Class B roof enlargements are not permitted development on article 2(3) land—legislation.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 Bexley

    Householder applications by street in Bexley

    Streets in Bexley with the most householder applications, and the share approved
    StreetApplicationsApproved
    Rydal Drive3688%
    Danson Road3578%
    Glenhurst Avenue3491%
    Westwood Lane3494%
    Wren Road3389%
    Harland Avenue3297%
    Halfway Street3167%
    Northumberland Avenue3197%
    Okehampton Crescent3090%
    Upton Road2679%
    Bellegrove Road2591%
    Latham Road25100%
    Mayplace Road East2584%
    Walton Road25100%
    Wansunt Road2596%
    Counts of householder applications by street; no individual applications are shown. Streets with fewer than five applications are left out.Source: GLA Planning London Datahub, householder applications, all years held. Contains public sector information licensed under the Open Government Licence v3.0. Contains OS data © Crown copyright and database right 2026.
    Loft enlargement in section: the permitted development limitsExtra roof volume allowed: 40 m³ (terrace house) / 50 m³ (any other house) additional roof volume. Set-back from the eaves: Original eaves maintained; enlargement set at least 0.2 m from the eaves measured up the roof slope, so far as practicable (not required for hip-to-gable or roofs joining a rear/side extension). Height limit: No part higher than the highest part of the existing roofABC

    Loft enlargement in section: the permitted development limits

    A dormer on the rear slope, with the limits that decide whether it needs planning permission.

    A · Extra roof volume allowed
    40 m³ (terrace house) / 50 m³ (any other house) additional roof volume
    B · Set-back from the eaves
    Original eaves maintained; enlargement set at least 0.2 m from the eaves measured up the roof slope, so far as practicable (not required for hip-to-gable or roofs joining a rear/side extension)
    C · Height limit
    No part higher than the highest part of the existing roof

    Permitted development on a Bexley roof

    Without a planning application, the loft is bounded by volume: 40 m³ (terrace house) / 50 m³ (any other house) additional roof volume. On height the national rule agrees with the council: No part higher than the highest part of the existing roof. The front slope is protected (No enlargement beyond the plane of a roof slope that forms the principal elevation and fronts a highway), and eaves are handled as follows: Original eaves maintained; enlargement set at least 0.2 m from the eaves measured up the roof slope, so far as practicable (not required for hip-to-gable or roofs joining a rear/side extension).

    No balcony or terrace can come with the enlargement: No verandah, balcony or raised platform. Because national and local rules lean the same way, a Bexley loft is mostly a question of proportion and detail, not of finding room.

    Which Bexley addresses lose the right

    The borough has 23 conservation areas, where the national wording is Class B roof enlargements are not permitted development on article 2(3) land. Historic England records 114 list entries here, and a listed house needs consent of its own. Around 17 per cent of the land is Green Belt, relevant to houses on the borough's edges.

    Most Bexley homes are houses: 75.3 per cent of households live in one and 68.6 per cent own it. So the permitted route is open to many owners, once the address has been checked.

    What Bexley's decisions show

    In its latest published year Bexley decided 877 householder applications. It granted 94.6 per cent and decided 99.4 per cent within eight weeks or an agreed extension. The figures cover every kind of householder work, so they tell us the council moves quickly and approves often, not how it will treat one particular roof.

    Choosing certificate or application

    A loft within the limits on an unconstrained house can be confirmed with a Lawful Development Certificate in Bexley. A front dormer or a taller ridge instead goes forward as householder planning, drawn like our planning drawings in Bexley.

    The stair, fire escape and set contents

    A loft stair has its own headroom rule: Loft conversions where 2.0 m cannot be achieved: 1.9 m at the centre of the stair, 1.8 m at the side (half width). A storey this high also needs protected escape: New storey above 4.5 m by loft conversion: protect the full escape route with fire-resisting doors (min E 20) and partitions (min REI 30). These details go into our building regulations drawings in Bexley, alongside roof insulation.

    The Bexley loft set holds existing and proposed floor plans, the stair, a roof section, elevations and the location and block plans, from £695 with VAT included. A second chartered technologist checks each sheet. If the council asks for changes, we redraw free of charge.

    Other roof forms and neighbouring boroughs

    For a particular form, see dormer loft conversion drawings in Bexley. A ground-floor addition is covered by rear extension drawings in Bexley, and everything we draw locally is listed under architectural drawings in Bexley. Compare Greenwich and Bromley.

    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.
    Converted loft bedroom with roof windows and a Juliet balcony
    Storey by storey
    Move up and down — the car travels between floors.

    Other services in Bexley

    Loft conversion drawings nearby

    Questions

    Can I add a dormer to a hipped side roof in Bexley?

    The council's guidance says dormers on a hipped side are generally avoided. A rear dormer set back from the main wall and below the ridge is the preferred form.

    Can a Bexley loft rise above the existing ridge?

    The council's guidance says a roof extension should not exceed the existing ridge height, and permitted development bars it too.

    How many Bexley householder applications are granted?

    94.6 per cent of 877 decisions in the latest published year, a borough-wide figure for all householder work.

    How much are loft conversion drawings in Bexley?

    From £695 including VAT, fixed up front. The council fee is separate.

    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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