One of the most expensive mistakes an HMO investor can make is buying a property to convert, then discovering it needs planning permission the council is unlikely to grant. Here is how the planning rules work, and what applies across Cheshire.
Use classes: C3, C4 and sui generis
An ordinary house or flat sits in use class C3. A small HMO shared by three to six unrelated people is use class C4. An HMO for seven or more people has no use class at all: it is ‘sui generis’, and converting to one always needs full planning permission, everywhere in the country.
Permitted development, and how Article 4 removes it
Normally, changing a C3 house into a C4 small HMO is permitted development, meaning no planning application is needed. An Article 4 direction removes that right for a defined area, so even a three-person house share needs full planning permission there. Councils use Article 4 to control the concentration of HMOs in particular neighbourhoods, and there is no guarantee an application will be approved.
What applies in Cheshire
Halton Borough Council, covering Widnes and Runcorn, introduced an Article 4 direction on 24 September 2025 covering certain parts of the borough. Within those areas, converting any dwelling house into an HMO needs planning permission, and Halton will not issue an HMO licence until that consent is in place, so the two systems are linked in practice. Cheshire West and Chester operates a similar direction in areas of Chester where high HMO concentrations were affecting the balance of the community. Anywhere in the county, an HMO for seven or more people needs planning permission regardless.
If your property was already operating as a small HMO before a direction took effect, you can apply to the council for a lawful development certificate as proof that planning permission is not required. That certificate is worth having: properties with established C4 use are increasingly sought after in Article 4 areas.
Planning permission is not a licence
The two systems are independent. A property can have planning consent and still be unlicensed, or hold a licence while breaching planning rules. Before you buy or convert, check both: the council’s Article 4 map and planning history for the address, and the licensing requirements for the number of occupants you intend.
How PYC Property can help
We manage HMOs across Widnes, Runcorn and the wider Cheshire area every day, so we know where the pinch points are. If you are weighing up a purchase or a conversion, we are happy to give you a straight view on the management and compliance side before you commit.
PYC Property manages HMOs and single lets across Widnes, Runcorn and the wider Cheshire area, with fees published openly: tenant introduction from £350, semi-managed at 7% + VAT and fully managed at 8% + VAT of monthly rent. For a free, no-obligation review of your property, call 0800 654 6485 or send an enquiry through our contact page.
This article is general information for landlords, not legal or planning advice, and reflects the position at the time of writing. Rules change, so always confirm current requirements with your local council and gov.uk, or ask us.