Do HMOs need planning permission in Hounslow?

Hounslow has 4 active Article 4 directions in our records. Where an Article 4 direction applies, permitted development rights to convert a home (use class C3) to a small HMO (C4) can be removed, so a full planning application is required. Coverage varies — verify with the council before relying on this.

When does an HMO need a licence in Hounslow?

Nationally, a property let to 5 or more occupants forming 2 or more separate households and sharing a kitchen, bathroom or toilet must hold a mandatory HMO licence — this applies in every council in England, including Hounslow. Some councils also run additional or selective licensing schemes covering smaller HMOs; check the current schemes with Hounslow council.

What are the minimum room sizes for a licensed HMO?

A mandatory HMO licence enforces national minimum sleeping-room floor areas: 6.51 m² for one person aged over 10, 10.22 m² for two people over 10, and 4.64 m² for a child under 10. These are national statute and apply in Hounslow.

Astor Place · Borough Intelligence

Hounslow HMO & Article 4 planning

2575 applications in the last 12 months · Current to 9 November 2026 via the Planning London Datahub — list only, no case papers.

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Hounslow — Grade unknown for HMO; 4 active A4 directions in our records, 2 HMO-specific.

Profile

Outer West London suburban borough with mixed density, family-oriented housing and significant Heathrow-proximate commercial character.

Planning

4 active Article 4 directions in our records (2 HMO-specific); verify current coverage with council as our sync may be incomplete.

Deal angle

HMO play constrained by confirmed HMO-specific Article 4 directions; bridging volume moderate (2,575 apps/12m) — council verification essential before underwriting.

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HMO Requirements in Hounslow

What it takes to run a House in Multiple Occupation in Hounslow — whether you need planning permission, the licence the property must hold, and the statutory minimum room sizes. Verify current details with the council before committing.

Full guides: HMO licensing in Hounslow ↗ · Article 4 directions ↗

01 · Planning permission

Planning permission required for small HMOs

An Article 4 direction removes permitted development rights for small HMOs (C3→C4) across the whole borough in our records — converting a family home to a small HMO needs full planning permission here. Confirm whether your property falls within the designated area.

See the full Article 4 picture below ↓

02 · Licence to operate

Mandatory HMO licence National

5 or more occupants forming 2 or more separate households

Any HMO occupied by five or more people making up two or more separate households (sharing a kitchen, bathroom or toilet) must hold a mandatory HMO licence. This applies in every council in England, regardless of the number of storeys.

No Additional or Selective licensing scheme in our records for Hounslow. Many boroughs operate schemes that extend licensing to smaller HMOs or all rented homes, and these change on five-year cycles — check the council's current designation via the gov.uk licence finder ↗.

03 · Minimum room sizes

One person aged over 10	6.51 m²
Two people aged over 10	10.22 m²
One person aged under 10	4.64 m²
Any sleeping room	≥ 4.64 m²

Kitchen, bathroom & WC standards

Licensed HMOs must provide adequate, well-located cooking, washing and toilet facilities for the number of occupants, plus safe gas/electrics, working fire detection and proper waste storage. The exact ratios (occupants per bathroom, per WC, kitchen size) are set by each council in its own HMO amenity standards — confirm the figures with the borough before committing to a scheme.

Minimum room sizes and the mandatory-licensing threshold are national law (Licensing of Houses in Multiple Occupation (Mandatory Conditions of Licences) (England) Regulations 2018), sourced under the Open Government Licence v3 — they apply in every council. Licensing designations shown are those in our records; verify the current position and exact amenity standards with Hounslow Council before relying on this. gov.uk: HMO licences ↗

Article 4 Directions in Hounslow planning.data.gov.uk

HMO conversion (C3→C4)

Requires full planning permission — permitted development rights removed.

borough-wide Relevant to: lender, investor, developer

Commercial to residential (Class MA / Prior Approval)

Fast-track Prior Approval route is blocked — full planning permission required.

certain designated areas Relevant to: developer, investor

Conservation area restrictions (1 designated area)

Extensions, roof alterations, and window/door changes require planning permission within these areas.

specific conservation areas only — not borough-wide Relevant to: buyer, developer, lender

HMO Restrictions (2)

All of these restrictions apply across the entire borough.

Borough-wide Article 4 (HMO) — Hounslow HMO since 2020

HMO Conversion (C3→C4)

Converting a family home (C3) to a small HMO of up to 6 people (C4) requires full planning permission — permitted development rights have been removed.

Relevant to: lender, developer, investor

View direction document ↗

Dwellinghouses (C3) to small HMOs (C4) - borough-wide Article 4 Direction HMO since 2023

HMO Conversion (C3→C4)

Converting a family home (C3) to a small HMO of up to 6 people (C4) requires full planning permission — permitted development rights have been removed.

Relevant to: lender, developer, investor

Commercial / Employment Zone Designation

This direction applies to a designated commercial or employment area (such as an industrial estate, employment land, town centre, or retail zone). It restricts permitted development rights within that commercial zone and has no effect on residential property.

Relevant to: developer

View direction document ↗

Change of Use / PDR (1)

Check the direction document to confirm the geographic extent.

Change of use or development that would result in new dwellings (Class MA/ZA) since 2025

Commercial to Residential (Class MA)

Converting commercial premises (Class E: offices, retail, cafés, light industrial) to homes requires full planning permission — the fast-track Prior Approval route is blocked here.

Relevant to: developer, investor

View direction document ↗

Conservation Area (1)

This restriction applies only within designated areas — it does not affect the whole borough.

Article 4(2) directions for Bedford Park and Gunnersbury Conservation areas since 2001

Conservation Area — Alterations & Extensions

In this conservation area, extensions, roof alterations and cladding to homes require planning permission — you cannot rely on permitted development rights.

Relevant to: buyer, developer, lender

View direction document ↗

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Hounslow HMO & Article 4 planning

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HMO Requirements in Hounslow

Article 4 Directions in Hounslow planning.data.gov.uk