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Hounslow, London

HMO conversion drawings in Hounslow

Hounslow now controls HMOs on two fronts across the whole borough: planning, through an Article 4 direction, and licensing, through an additional scheme that reaches every HMO. Our HMO conversion drawings in Hounslow start from £879 and are drawn to satisfy both teams from one survey.

From £679 drawings + £200 survey (£879 total), no VAT to add

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  • £2m PI insured
  • LABC Partnered
  • Fixed fees, no VAT to add

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We use it to check conservation areas and constraints.
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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 hmo conversion drawings

    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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    Planning: a trigger tied to occupation

    The council's guidance on its direction says it applies borough-wide and is recorded as borough-wide from 4 September 2023. The trigger is occupation: planning permission is needed when a property is newly occupied by three or more people in separate households after that date.

    The council also says it will not enforce against existing HMOs, or against HMOs that were lawfully converted before the date. For a buyer that creates a precise question to answer: was the house occupied as an HMO before the date, and can you prove it?

    The FAQ adds a point that surprises people. Starting construction work before the date does not avoid the requirement, because it is the occupation that counts. We build the evidence file for existing use, and draw the application where consent is needed.

    Red-brick mansion blocks and shopfronts on a street corner

    Local figures for Hounslow

    Figures with their unit, period and source
    MeasureValuePeriodSource
    A borough-wide Article 4 direction removes the right to change a family home to a small HMO; it comes into force on 4 September 2023 and applies when three or more people in separate households newly occupy the property after that date. The council will not enforce against existing HMOs.borough-wide from 4 September 2023—hounslow.gov.uk, Council FAQ: Dwellinghouses to Small HMOs Article 4 Direction, implementation date answers
    Additional HMO Licensing was designated on 11 September 2025 and applies borough-wide: from 11 December 2025 all HMOs in Hounslow must be licensed under it, unless exempt.all HMOs from 11 December 2025—hounslow.gov.uk, HMO Licensing Policy 2025, additional licensing section
    Where planning permission is needed but has not been obtained, the council can grant a reduced-term licence of one year, or vary an existing licence to that shorter period, so the landlord can remedy the planning issue.one-year reduced-term licence—hounslow.gov.uk, HMO Licensing Policy 2025, planning and licensing section
    Households living in a house54 % of households living in a house or bungalow (detached, semi-detached or terraced)Census 2021nomisweb.co.uk
    Green Belt share of the council area22 % of council area covered by green-belt polygons—planning.data.gov.uk
    Minor application decisions312 decisions1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Minor applications granted72.4 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Minor applications decided in time97.1 % decided within 8 weeks or an agreed extended period1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Conservation areas33 named conservation areas published by the council—planning.data.gov.uk
    Mayoral CIL charging band2 MCIL2 charging band (1-3)—london.gov.uk
    Borough CIL residential rate£200/m² (CIL Zone 1, East); £110/m² (CIL Zone 2, Central); £70/m² (CIL Zone 3, West)schedule rate (2015); the council states the 2026 index figure is 400 but publishes no indexed rates on its CIL pagepfm.exacom.co.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
    Building regulations, layer by layerPart A: structure: Approved Document A: Structure, 2004 edition incorporating 2004, 2010 and 2013 amendments. Part B: fire safety: All dwellings: fire detection and alarm system minimum Grade D2 Category LD3 (BS 5839-6), mains-operated smoke alarms to BS EN 14604. Part L: insulation: New elements in existing dwellings, limiting U-values W/(m²·K): roof 0.15, wall 0.18, floor 0.18, windows 1.4 (or WER Band B), doors 1.4. Part K: stairs: 2.0 m clear headroom over stairs. Full plans application: Building control body must decide a full plans application within 5 weeks, or longer if agreed in writingPart A: structurePart B: fire safetyPart L: insulationPart K: stairsFull plans applicationABCDE

    Building regulations, layer by layer

    The Approved Documents that shape most house projects, from structure to the application itself.

    A · Part A: structure
    Approved Document A: Structure, 2004 edition incorporating 2004, 2010 and 2013 amendments
    B · Part B: fire safety
    All dwellings: fire detection and alarm system minimum Grade D2 Category LD3 (BS 5839-6), mains-operated smoke alarms to BS EN 14604
    C · Part L: insulation
    New elements in existing dwellings, limiting U-values W/(m²·K): roof 0.15, wall 0.18, floor 0.18, windows 1.4 (or WER Band B), doors 1.4
    D · Part K: stairs
    2.0 m clear headroom over stairs
    E · Full plans application
    Building control body must decide a full plans application within 5 weeks, or longer if agreed in writing

    Licensing reaches every HMO

    The council's licensing policy says the additional scheme applies across the borough, with the position recorded as all HMOs from 11 December 2025. In practice, a shared house of three or more people needs a licence unless exempt.

    The policy also deals with the overlap. Where planning permission is needed but has not been obtained, the council can issue a one-year reduced-term licence, so the landlord can remedy the planning issue. Its guidance expects the planning application to come first.

    Because both teams read the same layout, we draw it to the standards of each: room sizes, shared facilities, fire safety and escape. Our HMO licence application pack uses the approved sheets.

    What the drawing set shows

    For the planning file we prepare measured existing and proposed floor plans, a room schedule, the shared kitchen and bathrooms and a site plan showing parking, cycle and refuse storage. Hounslow has 54 per cent of households in houses, and many conversions are inter-war semis near Heathrow and the Piccadilly line.

    If extra rooms are needed, see rear extension drawings in Hounslow and loft conversion drawings in Hounslow. Green Belt covers 22 per cent of the borough.

    How Hounslow decides small schemes

    A new HMO is a minor application. Hounslow decided 312 minor applications in the latest published year, granted 72.4 per cent and decided 97.1 per cent in time. It has 33 conservation areas.

    Levy and the alternatives

    The borough levy is zoned: £200/m² (CIL Zone 1, East); £110/m² (CIL Zone 2, Central); £70/m² (CIL Zone 3, West). The Mayoral levy is in band 2. A conversion without new floor area may not be chargeable.

    To compare with flats, see flat conversion drawings in Hounslow; next door, Hillingdon and Ealing have their own rules. The borough overview is architectural drawings in Hounslow.

    What you receive

    Building regulations section drawing showing the construction build-up
    Sample drawing. Building regulations section showing construction build-up for a building control check.
    Pencil resting on a dimensioned technical drawing beside a scale rule
    Unit by unit
    Move up and down — the nearest units slide out.

    Other services in Hounslow

    HMO conversion drawings nearby

    Questions

    When did Hounslow's borough-wide HMO Article 4 direction start?

    The council's FAQ records it as borough-wide from 4 September 2023.

    Does every HMO in Hounslow need a licence?

    Unless exempt, yes: the council records the additional scheme as all HMOs from 11 December 2025.

    What if planning permission has not been obtained?

    The council can grant a one-year reduced-term licence so the landlord can fix the planning position.

    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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