Planning in Hounslow

Before submission

Validation requirements

Hounslow Council mandates specific documentation to validate planning applications, including requirements for fire safety compliance. Applicants must consult the official validation checklist provided by the council to ensure all statutory and local criteria are met.

• For all non-major applications, a site plan showing dedicated unobstructed areas for fire equipment and evacuation is required.
• A statement confirming adherence to policy D12a of the London Plan must be submitted for non-major applications.
• The council provides a downloadable validation checklist outlining mandatory Central Government and local requirements.
• Submitting applications using the council’s document naming conventions can help process applications faster.

SourceHounslow — application requirements(opens in a new tab)· checked 2026-10-07

Timescales

Realistic decision times

Statutory target

The national determination period set in law, counted from validation. A target, not a guarantee.

Actual processing time

What the council's published performance data shows in practice, including extensions of time.

Allow for validation before the decision period starts. The usual statutory determination periods in England are 8 weeks for non-major applications, 13 weeks for major development and 16 weeks where environmental impact assessment is required, unless a different period is agreed.

• These are statutory targets, not a measured borough average or a guarantee. No current borough-specific average has been verified for this guide.
• An incomplete submission, amendments, committee referral or an agreed extension of time can extend the overall programme.
• Ask the planning team about its current validation queue before setting a construction date. Prior approval and other specialist applications can have different statutory periods.

SourceGOV.UK — determining a planning application(opens in a new tab)· checked 2026-10-07

Permitted development

Article 4 restrictions

These are selected directions, not an exhaustive address search. Read the council’s current map, schedule, commencement date and any later modifications for your property. A conservation area is not automatically an Article 4 area, and a direction affecting changes of use does not necessarily restrict a home extension. Confirm the responsible planning authority too: some development-corporation areas have separate arrangements.

Hounslow Council has implemented various Article 4 Directions to restrict certain permitted development rights across the borough. These include borough-wide controls on HMOs and specific conservation area protections, alongside newly confirmed restrictions on residential conversions.

• A borough-wide Direction for C3 to C4 HMO changes was confirmed on 8 August 2023 and came into force on 4 September 2023.
• A Direction confirmed on 4 March 2025, effective 22 April 2025, removes Class MA (commercial to residential) and Class ZA (demolition and rebuild) rights in specified town and industrial centres.
• Bedford Park and Gunnersbury Conservation Areas are subject to Article 4(2) directions requiring planning permission for specific alterations to dwellings.
• An Article 4 Direction for Brentford Dock regarding gates and fences was withdrawn following a Chief Officer decision in March 2023.

SourceHounslow — Article 4 information(opens in a new tab)· checked 2026-10-07