What is an HMO? House in Multiple Occupation Guide

Definition: A House in Multiple Occupation (HMO) is a residential property let to three or more tenants who form two or more separate households and share facilities such as kitchens or bathrooms. HMOs are one of the most financially attractive forms of buy-to-let investment because each bedroom generates independent rental income, delivering gross yields of 8–15% compared to 4–6% for single-let properties. However, they attract significant regulatory obligations: any property let to five or more people from at least two households requires a mandatory HMO licence from the local authority. Smaller HMOs may still require an additional licence in designated areas. Fire safety standards are strict, including interlinked alarms, fire doors, and emergency lighting. Lenders treat HMOs as specialist assets and typically require a minimum 25% deposit, an HMO-specific mortgage product, and evidence that the property is (or will be) fully licensed. Understanding the legal definition is essential, as operating an unlicensed HMO can result in civil penalties of up to £30,000 and a rent repayment order.