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Hounslow, London

Wraparound extension drawings in Hounslow

Wraparound extension drawings in Hounslow need an early look at the plot shape, because the council's Residential Extension Guidelines say a wraparound joining a side and rear extension on a corner plot will be refused. Our MCIAT chartered architectural technologists draw them from £1,195 including VAT. Only 78.5% of 689 householder applications were granted in the latest twelve months.

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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

    The corner-plot rule in Hounslow

    Few councils name the wraparound in their guidance. Hounslow does, in its Residential Extension Guidelines: where a side extension and a rear extension would join on a corner plot, the council says it will refuse the combined form. The reasoning is plain enough. A corner house is seen from two streets, and a wraparound fills the gap that gives it a garden edge on the street side.

    That makes the first question about your plot, not your design. On a mid-terrace or a plain semi that particular rule does not apply, though we still set the side arm back and keep the roof clear of the neighbour. On a corner, we would normally propose a rear extension plus a separate, smaller side element, with a visible break between them.

    The council's wider design guidance is the Character, Sustainability and Design Codes SPD, and the local plan is Hounslow Local Plan 2015-2030 (Volumes 1 and 2). We read the three together before suggesting any shape.

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

    Local figures for Hounslow

    Figures with their unit, period and source
    MeasureValuePeriodSource
    Conservation areas33 named conservation areas published by the council—planning.data.gov.uk
    Green Belt share of the council area22 % of council area covered by green-belt polygons—planning.data.gov.uk
    Article 4 directions3 Article 4 directions published by the council—planning.data.gov.uk
    Listed building entries519 list entries (Historic England, within the LPA boundary)—planning.data.gov.uk
    Householder decisions689 decisions1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications granted78.5 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications decided in time97.8 % decided within 8 weeks or an agreed extended period1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Households living in a house54 % of households living in a house or bungalow (detached, semi-detached or terraced)Census 2021nomisweb.co.uk
    Domestic gardens share of land (GLUD 2005)21.5 % of land that is domestic garden (GLUD 2005)2005data.london.gov.uk
    Supplementary planning documentCharacter, Sustainability and Design Codes SPD2024hounslow.gov.uk
    Larger home extension prior approvals refused59 decisions2025 Q2 to 2026 Q1 (1 Apr 2025 to 31 Mar 2026)assets.publishing.service.gov.uk
    Householder: alterations/extensions to a single dwellinghouse, from 1 Apr 2026548 GBP—ribblevalley.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 Hounslow

    Householder applications by street in Hounslow

    Streets in Hounslow with the most householder applications, and the share approved
    StreetApplicationsApproved
    Firs Drive3761%
    Wood Lane3259%
    Park Drive3169%
    Parkwood Road2859%
    Worton Road2758%
    Arnold Crescent2654%
    Popes Lane2483%
    St Stephens Road2477%
    Whitton Dene2450%
    Harewood Road2378%
    Princes Avenue2382%
    Spring Grove Road2355%
    Fern Lane2268%
    Netheravon Road2273%
    North Hyde Lane2255%
    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

    Hounslow decision figures and what to expect

    78.5% of 689 householder applications were granted, though 97.8% were decided in time. A fast decision with a lower grant rate means the council is willing to say no quickly, so drawings should answer the guidelines directly, in the design statement, rather than leave an officer to find the conflict.

    The prior approval route for deeper rear extensions shows the same caution: the council granted 20 and refused 59 larger home extension applications in the latest return year. A wraparound with a side element is a householder application anyway, with a council fee of £548.

    Where the work fits the national limits, a Lawful Development Certificate avoids the discretionary judgement altogether. Hounslow handled 445 of these in its latest return year.

    Heritage, Article 4 and an unusual designation

    The borough has 33 conservation areas and 519 list entries, and 1 World Heritage Site intersects its boundary. Only 3 Article 4 directions are published, so the address check still matters before relying on permitted development.

    Green Belt covers about 22% of the borough, where proportionality to the original house is the test. On a wraparound that means counting every earlier extension.

    Because a wraparound includes a side extension, none of it can use the national rights in a conservation area, and the application is judged on its merits against the area's character.

    Housing, levy and what you receive

    54% of households live in a house or bungalow and 45.7% own their home, with an average price of £525,435. Gardens account for 21.5% of the borough. The Mayoral CIL band is 2 at £72.73 per square metre indexed, and the borough charges £200/m² (CIL Zone 1, East); £110/m² (CIL Zone 2, Central); £70/m² (CIL Zone 3, West) by zone, though levies generally apply to larger additions only.

    Our set has existing and proposed plans, elevations, sections, a roof plan and a location and block plan. If a corner plot rules out the full wraparound, see rear extension drawings in Hounslow, which suit that case.

    We prepare party wall notices for neighbours and list everything we do locally at architectural drawings in Hounslow. If the council asks for changes before deciding, we redraw them free of charge.

    What a corner plot can still do

    A corner house is not shut out of an extension. A rear extension that stops short of the side boundary, plus a modest side porch or utility room with a visible gap between them, reads as two additions rather than one wrap. We draw that version alongside the wraparound when the plot calls for it, so you can compare floor area and cost.

    A short checklist before you commit

    Before paying for a design, check four things: whether your house is on a corner, whether any conservation area or Article 4 direction covers the address, how much has already been added to the original house, and whether a tree or sewer crosses the proposed footprint. We run all four at the survey stage and report them in plain language.

    With those answers a wraparound is either a sound plan, a plan that needs a different shape, or a plan to drop in favour of something simpler. Knowing which, before the design fee is spent, is the most useful thing a drawing practice can tell you.

    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 Hounslow

    Wraparound extension drawings nearby

    Questions

    Does Hounslow allow wraparound extensions?

    On many plots yes, but the council's extension guidelines say a wraparound linking a side and rear extension on a corner plot will be refused.

    How often does Hounslow grant householder applications?

    78.5% of 689 decisions in the latest twelve months.

    Which design guidance does Hounslow use?

    The Character, Sustainability and Design Codes SPD, alongside its Residential Extension Guidelines and Hounslow Local Plan 2015-2030 (Volumes 1 and 2).

    What do the drawings cost?

    From £1,195 including VAT. The council 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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