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Wandsworth, London

Loft conversion drawings in Wandsworth

Wandsworth's answer to a low loft is to build backwards, not upwards. The Housing SPD asks for roof alterations to stay at the rear and calls a raised ridge likely to be visually intrusive. Loft conversion drawings start at £695 including VAT, and we draw the street elevation to show that nothing visible has been lifted.

From £695 (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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    Converted loft bedroom with roof windows and a Juliet balcony

    What the Housing SPD asks of a Wandsworth loft

    Wandsworth's roof rules sit in its Housing SPD (covers rear extensions, basements, roof extensions and loft conversions), which supports the Wandsworth Local Plan 2023-2038. For a loft, two statements carry the weight. The housing policy says extensions, dormers and other roof alterations should be confined to the rear of the building, and that where they can be seen from the street they must be sympathetic and not visually intrusive.

    Paragraph 4.151 then says that raising the roof ridge to gain loft headroom is likely to be visually intrusive. Read together, the pattern is plain: put the added volume on the back slope, and find headroom without lifting the ridge you see from the pavement.

    In practice the survey decides everything. It measures the existing roof, and if the height is short the answer is usually a bigger rear dormer, not a taller ridge. Every set includes a street elevation with the neighbouring houses drawn in, showing the new roof sitting behind the line already seen from the road.

    Brick cottage with a tiled roof, chimneys and a front dormer window

    Local figures for Wandsworth

    Figures with their unit, period and source
    MeasureValuePeriodSource
    Conservation areas46 named conservation areas published by the council—planning.data.gov.uk
    Listed building entries312 list entries (Historic England, within the LPA boundary)—planning.data.gov.uk
    Households living in a house31.4 % of households living in a house or bungalow (detached, semi-detached or terraced)Census 2021nomisweb.co.uk
    Average house price686,076 GBP2026-07publicdata.landregistry.gov.uk
    Householder decisions977 decisions1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications granted91.9 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications decided in time92.4 % decided within 8 weeks or an agreed extended period1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Lawful development certificate applications (PS1)360 certificates2025 Q2 to 2026 Q1 (1 Apr 2025 to 31 Mar 2026)assets.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(f)Class B roof enlargements are not permitted development on article 2(3) land—legislation.gov.uk
    Approved Document K 2013, para 1.13, Diagram 1.4Loft 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)—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 Wandsworth

    Householder applications by street in Wandsworth

    Streets in Wandsworth with the most householder applications, and the share approved
    StreetApplicationsApproved
    Earlsfield Road2889%
    Dover House Road2774%
    Broomwood Road2692%
    Sutherland Grove2682%
    Elborough Street2592%
    Elsenham Street2591%
    Elsley Road24100%
    Wakehurst Road2490%
    Deodar Road2289%
    Huntingfield Road2291%
    Mallinson Road2291%
    Thurleigh Road22100%
    Engadine Street21100%
    Magdalen Road2180%
    Burntwood Lane2089%
    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

    When the back slope can be seen

    Not every Wandsworth roof hides its rear. Corner houses, mews and houses beside a lane or railway can show the back slope to the public, and the policy covers that case in its second half: visible work must be sympathetic.

    For those houses we add a view taken from the public side and keep the dormer modest. It is set well back from the eaves, ridge and party wall, and clad to match the roof, with a short note that ties each choice to the guidance so the officer can follow the reasoning.

    Conservation areas and listed houses

    The council publishes 46 conservation areas. A loft enlargement is not permitted development in any of them: Class B roof enlargements are not permitted development on article 2(3) land. Historic England lists 312 entries in the borough, and a listed house needs separate consent for most roof alterations.

    Outside those limits a house may use the national allowance: 40 m³ (terrace house) / 50 m³ (any other house) additional roof volume. Only 31.4 per cent of households live in a house or bungalow, against 42.5 per cent who own their home, so for many Wandsworth households the right does not apply and an application is the route.

    Wandsworth in numbers

    The latest average sale price is £686,076, and gardens cover 21.5 per cent of the land. The council decided 977 householder applications in its latest year and granted 91.9 per cent, deciding 92.4 per cent within eight weeks or an agreed extension.

    Householder results cover every kind of project, so they show a council that grants most of what it decides without predicting one roof. The authority also received 360 applications for lawful development certificates in its latest returns, the proof route for a loft that stays within the permitted limits.

    Stair and escape when the ridge cannot move

    If the ridge stays put, the stair has to take its headroom from the roof you have. Building control allows a concession where full height cannot be reached: 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 new storey also needs a protected route: 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).

    Because those two rules and the rear-only policy meet at the stair, we model several landing positions first and show what each costs the floor below.

    Drawings, price and nearby pages

    The set has existing and proposed plans, the stair, a roof section and every elevation, with the location and block plans. Fees start at £695 including VAT, agreed before work begins, and if the council wants changes we redraw them free.

    A loft often comes with a ground-floor project: see rear extension drawings in Wandsworth and side return extension drawings in Wandsworth. For the rear dormer itself, read dormer loft conversion drawings in Wandsworth. The borough overview is architectural drawings in Wandsworth, and neighbours include Lambeth, Merton and Richmond upon Thames.

    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.
    Rear view of brick terraced houses in London with slate roofs and chimney stacks along the shared roofline
    Storey by storey
    Move up and down — the car travels between floors.

    Other services in Wandsworth

    Loft conversion drawings nearby

    Questions

    Can I raise the ridge for a loft conversion in Wandsworth?

    The Housing SPD says raising the roof ridge to gain loft headroom is likely to be visually intrusive. A rear dormer is the usual way to gain headroom instead.

    Does Wandsworth require loft dormers to be at the rear?

    The housing policy says roof alterations should be confined to the rear of the building, and sympathetic and not visually intrusive where they can be seen from the street.

    How many conservation areas does Wandsworth have?

    The council publishes 46. A loft enlargement in one of them needs an application.

    How much do loft conversion drawings cost in Wandsworth?

    From £695 including VAT, fixed up front. Council application fees are paid separately.

    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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