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Westminster, London

Wraparound extension drawings in Westminster

Westminster is mostly conservation area and very few of its homes are houses, so a wraparound extension here is a specialist job. We prepare wraparound extension drawings for Westminster from £1,195 including VAT, and we begin with the heritage check that decides what is possible.

From £1,195 (VAT included)

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  • £2m PI insured
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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 wraparound extension 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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    House extension under construction with scaffolding, new glazed doors and building materials

    Westminster's roof and mews guidance applied to a wraparound

    For a wraparound, the relevant Westminster documents are the Roofs: a guide to alterations and extensions on domestic buildings SPG and the Mews: a guide to alterations SPG, and between them they cover the two house types where a wraparound could realistically happen: stucco terraces and mews houses.

    The mews guide matters most. A mews house is small, sits on a service lane, and usually has a courtyard rather than a garden. A wraparound there means building into the courtyard, which the guide treats cautiously because the open space is part of the mews character. The council's City Plan 2019-2040 (2026) adds a layer on top, and it was only adopted in 2,026, so older advice may be out of date.

    We check which document applies to your street, quote the relevant paragraphs on the sheet notes, and draw the courtyard before and after, so the officer sees how much open space remains.

    Stucco terraces in Belgravia, Pimlico and Bayswater follow another logic. The ground floor often has a lower-ground kitchen opening onto a narrow garden, and a wraparound there would join the closet wing to a side infill. That changes a rear elevation that may be uniform along the row and seen from many windows, so the drawings include rear elevations of the whole terrace, not only your house.

    The Roofs guide also matters if the extension is topped with a roof terrace or a lantern. It deals with the top of the building, and we draw the top edge of any extension to match.

    Brick house being extended, with a wide new opening supported over the ground floor

    Local figures for Westminster

    Figures with their unit, period and source
    MeasureValuePeriodSource
    Supplementary planning documentRoofs: a guide to alterations and extensions on domestic buildings SPG—westminster.gov.uk
    Supplementary planning documentMews: a guide to alterations SPG—westminster.gov.uk
    Conservation areas56 named conservation areas published by the council—planning.data.gov.uk
    Article 4 directions10 Article 4 directions published by the council—planning.data.gov.uk
    Listed building entries4,015 list entries (Historic England, within the LPA boundary)—planning.data.gov.uk
    Tree preservation orders685 tree preservation orders published by the council—planning.data.gov.uk
    Households living in a house10.2 % of households living in a house or bungalow (detached, semi-detached or terraced)Census 2021nomisweb.co.uk
    Householder decisions366 decisions1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications granted82 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications decided in time79 % decided within 8 weeks or an agreed extended period1 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 Westminster

    Householder applications by street in Westminster

    Streets in Westminster with the most householder applications, and the share approved
    StreetApplicationsApproved
    Randolph Avenue1679%
    Ashworth Road1385%
    Clifton Hill1170%
    Ponsonby Place10100%
    Lancaster Mews938%
    Westbourne Park Road988%
    Carlton Hill886%
    Kilburn Lane886%
    Sutherland Place863%
    Wilton Row8100%
    Caroline Close733%
    Chester Row7100%
    Greenberry Street757%
    Hereford Road760%
    Hyde Park Gardens Mews775%
    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.
    Single-storey rear extension: the permitted development limitsDepth beyond the original rear wall: 3 m (attached) / 4 m (detached) beyond the original rear wall, single storey. Maximum height: 4 m. Within the zone near the boundary: Eaves no higher than 3 m where within 2 m of the curtilage boundary. Larger extension under prior approval: 6 m (attached) / 8 m (detached), single storey, height max 4 m; not on article 2(3) land or an SSSIABCD

    Single-storey rear extension: the permitted development limits

    The house in section with a rear extension; the dashed lines mark the zone near the boundary.

    A · Depth beyond the original rear wall
    3 m (attached) / 4 m (detached) beyond the original rear wall, single storey
    B · Maximum height
    4 m
    C · Within the zone near the boundary
    Eaves no higher than 3 m where within 2 m of the curtilage boundary
    D · Larger extension under prior approval
    6 m (attached) / 8 m (detached), single storey, height max 4 m; not on article 2(3) land or an SSSI

    A borough built of conservation areas

    Westminster publishes 56 conservation areas and 10 Article 4 directions, and Historic England lists 4,015 entries within the council area. It also contains 1 World Heritage Site.

    On this land the national position is firm: On article 2(3) land (conservation areas etc.): no side extensions, no cladding, no rear extension of more than one storey under Class A. A wraparound always has a side arm, so you will need a planning application, and a listed building may need consent in addition.

    The council has recorded 685 tree preservation orders over 263 zones, so even a small courtyard tree can be protected. We note trees on the survey before we design anything near them.

    Heritage statements are a normal part of an application in this borough. We can prepare the drawings that a heritage consultant needs, and we will tell you if one is likely to be asked for before you submit.

    How few Westminster households live in a house

    Only 10.2 per cent of households live in a house, and just 27.4 per cent own their home. Many wraparound ideas in Westminster are in fact leasehold flats where the owner wants a ground-floor extension into a garden shared with others.

    That changes the first step. Before planning, you need the freeholder's agreement, and often the other lessees', because the building's title includes the garden. We ask for the lease and the title plan at the start, so you know whether the project can proceed.

    If you are a leaseholder, expect the freeholder to ask for structural information, because a ground-floor extension can affect a structure the flats share.

    Decisions and timing at Westminster

    Westminster decided 366 householder applications in its latest published year. It granted 82 per cent, and decided 79 per cent in time.

    The prior approval route has little role here: 0 granted and 0 refused in the latest twelve months. Anything you build will need a full application, and often an accompanying heritage statement.

    The householder fee is £548, and glazing is a design issue in its own right: Windows, roof windows, rooflights and doors in an extension should not exceed 25% of the extension floor area plus the area of openings removed or covered.

    Decision times matter more than the headline rate in a borough like this. Where a listed building application runs alongside a householder case, we advise clients to plan around the slower of the two when more than one consent is needed.

    Wraparound extension drawings in Westminster: the package

    Westminster's terraces are tightly joined, so expect a notice: Line-of-junction (new wall) notice at least 1 month before work. Our drawings start at £1,195 including VAT, a second chartered technologist checks every sheet, and we redraw at no charge if the council asks for amendments.

    You may also want rear extension drawings in Westminster or house extension drawings in Westminster. The full range is at architectural drawings in Westminster. The same service is also available in Kensington and Chelsea and Lambeth.

    If after a first conversation a wraparound turns out to be unrealistic, we say so and suggest alternatives such as an internal reconfiguration or a lightweight rear addition. The fee for the drawings is fixed and published before you commit.

    We will also confirm the practical side before you spend on drawings: where a skip can stand, how materials reach a courtyard behind a terrace, and whether the street needs a licence for site hoarding. In Westminster those points decide whether a scheme is buildable, and they are cheaper to settle on paper than on site.

    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.
    Finished white-rendered rear house extension with large glazed doors
    Every side considered
    Flick across the turntable to spin it.

    Other services in Westminster

    Wraparound extension drawings nearby

    Questions

    Can I build a wraparound in Westminster?

    Only with a full planning application. The national rule in a conservation area is: On article 2(3) land (conservation areas etc.): no side extensions, no cladding, no rear extension of more than one storey under Class A. Westminster has 56 of them.

    Do Westminster mews houses have special rules?

    Yes. The council's Mews: a guide to alterations SPG covers alterations to mews buildings.

    How many Westminster households live in a house?

    Only 10.2 per cent, so most extension questions come from flats.

    What do wraparound drawings cost in Westminster?

    They start at £1,195 including VAT, and the council's householder fee is £548.

    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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