Harrow Article 4 Direction: HMO Planning Permission Rules for Landlords

One of the biggest traps in Harrow landlord licensing is the gap between a property licence and planning permission. They are governed by entirely separate legislation, and holding one does not give you the other.

Since 12 June 2026, Harrow has had a confirmed borough-wide Article 4 Direction that removes permitted development rights for converting a single dwelling (Use Class C3) into a small HMO (Use Class C4, 3 to 6 unrelated occupants). Every such conversion anywhere in Harrow now requires express planning permission.

How the Article 4 Was Made

The timeline was rapid:

• 11 June 2026: Harrow Cabinet approved making the direction
• 12 June 2026: The direction was executed and took immediate effect, suspending permitted development for C3-to-C4 conversions borough-wide
• 12 June–27 July 2026: Six-week statutory public consultation
• 24 September 2026: Cabinet resolved to confirm the direction
• 14 October 2026: The direction was formally confirmed

Formal confirmation on 14 October beat the six-month deadline (12 December 2026) by nearly two months. The direction is now permanent.

What This Means in Practice

Normally, converting a house from C3 (family dwelling) to C4 (small HMO for 3–6 people) is permitted development — you don't need planning permission. The Article 4 Direction removes that right across all 22 Harrow wards.

If you want to take a single-family house and let it as a shared house with three or more unrelated tenants, you need planning permission for the change of use and, separately, the appropriate property licence.

Large HMOs — those occupied by seven or more individuals — fall under the Sui Generis planning use class and have always required planning permission, regardless of any Article 4 Direction.

The Planning-Licensing Firewall

This is the critical point: getting an HMO licence from Harrow's Private Sector Housing team does not grant, imply, or substitute for planning permission. And getting planning consent for an HMO conversion does not exempt you from licensing.

You need both, obtained through separate processes from separate council departments. Landlords who conflate the two risk spending money on a licence application for a property that doesn't have planning permission to operate as an HMO.

Existing Small HMOs

Landlords who were already operating a small HMO lawfully before 12 June 2026 are protected by existing lawful use rights. But "lawfully" is the key word, and you'll need documentary evidence to prove pre-existing operation if planning enforcement ever queries it. Tenancy agreements, council tax records, and utility bills from before the Article 4 date all help establish the timeline.

If you converted after 12 June 2026 without planning permission, the fact that you have a property licence doesn't protect you from a planning enforcement notice.

For a detailed explanation of how the Article 4 Direction interacts with Harrow's three licensing regimes and the steps to check both planning and licensing compliance, see our Harrow landlord licensing guide.

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