HMOs require mandatory licensing if they have 5 or more tenants, 3 or more storeys, and 2 or more households. Local authorities can also require additional licensing for HMOs in designated areas or boroughs that are poorly managed and causing problems. To obtain a license, landlords must submit an application and pay a fee. Licenses last up to 5 years and apply only to the specified property. Local authorities review suitability of the property, landlord, and management arrangements and can impose mandatory and discretionary conditions. It is a criminal offence to operate an unlicensed HMO, which can result in prosecution or civil penalties.