An HMO is a property rented by three or more unrelated people who share facilities such as kitchens or bathrooms.

Whether you need planning permission depends on the property’s size, location, and local council policies:

SMALL HMOs (USE CLASS C4): Up to 6 occupants. May be done under permitted development rights without requiring a full planning application - unless restricted by Article 4

LARGE HMOs (SUI GENERIS): More than 6 occupants. Always requires planning permission

Local rules vary, so it’s always worth a quick check by a planning professional before you start work - Contact Us

Does your HMO conversion need Planning Permission?

Article 4 Directions — Why They Matter for Landlords and Developers

If you’re planning an HMO conversion, one of the most important planning tools to understand is the Article 4 Direction.

Councils use Article 4 to remove permitted development rights, meaning you may need full planning permission, even for small HMOs that would normally be allowed.

These are often introduced in areas with high HMO concentrations, to help maintain balanced communities.

Before starting work, check whether Article 4 applies in your area.

Your local planning authority’s website will usually have an Article 4 map or policy note.

A quick consultation can save months of delay and prevent costly refusals - Contact Us

5 Tips for a Winning HMO Planning Application

HMOs can be profitable investments — but your planning application needs to be watertight.

• Review your council’s HMO guidance

• Provide clear floor plans and occupancy details

• Address parking, noise, and refuse early

• Consider neighbourhood impacts (e.g., “sandwiching”)

• Work with a planning consultant familiar with local policy

At Cathedral Planning, we guide clients through every stage — from feasibility to approval.

We provide low-cost, fast reviews of potential HMO properties and expert advice on the best way to deal with your local council.

Get in touch to discuss your next HMO project - Contact Us

Get in touch to discuss your next HMO project