Converting a House to an HMO

What This Requirement Covers

Converting a single-family dwelling (Use Class C3) to a House in Multiple Occupation (Use Class C4 for small HMOs of 3-6 persons, or sui generis for larger HMOs of 7+) involves planning, licensing, and Building Regulations requirements. The requirements vary depending on the size of the HMO and the local authority area.

Key Requirements

Planning Permission

1. Change from C3 (dwelling) to C4 (small HMO, 3-6 persons): Permitted development in most areas (no planning permission required)
2. Some local authorities have removed this permitted development right using an Article 4 direction, requiring a planning application for C3 to C4 changes
3. Change from C3 to a large HMO (7+ persons, sui generis): Planning permission is always required
4. Check with the local planning authority whether an Article 4 direction applies in your area

Building Regulations

Building work associated with the conversion may trigger Building Regulations requirements

1. Fire safety (Part B): Upgrading fire detection, installing fire doors, providing protected escape routes, and adding emergency lighting as required by LACORS guidance
2. Sound insulation (Part E): Separating walls and floors between letting rooms may need to be upgraded (though this is not a Building Regulations requirement unless a material change of use is involved)
3. Means of escape: Adequate escape routes from all rooms, particularly bedrooms on upper floors
4. Electrical safety (Part P): New circuits, consumer unit upgrades, and fire alarm installation
5. Structural alterations: Any structural changes (removing walls, adding rooms) require Building Regulations approval

Licensing

1. Mandatory licensing: Required if the HMO has 5+ occupants from 2+ households
2. Additional licensing: May be required in areas where the local authority has designated an additional licensing scheme
3. The licence application must demonstrate compliance with fire safety, room size, and amenity standards

Practical Compliance Tips

1. Check planning requirements first; an Article 4 direction will require a full planning application
2. Carry out a fire risk assessment and implement the LACORS fire safety recommendations before accepting tenants
3. Apply for the HMO licence before letting the property; operating without a licence is a criminal offence
4. Ensure all rooms meet the minimum size requirements for their intended occupancy
5. Provide adequate kitchen and bathroom facilities based on the number of occupants
6. Budget for the fire safety upgrades (fire doors, detection, emergency lighting); these are the most significant cost of conversion
7. Consider the impact on neighbours; HMOs can generate more activity and parking demand than a single family dwelling