Overcrowding in residential property is defined by law and assessed by local housing authorities when investigating housing conditions or allocating priority on housing waiting lists. The legal definition under the Housing Act 1985 uses two separate standards, either of which, if breached, constitutes statutory overcrowding.

The Room Standard

The room standard is breached if two people of opposite sexes over the age of ten, who are not living together as a couple, are required to sleep in the same room. Children under ten are disregarded for this purpose. In practical terms, in a three-bedroom house, the room standard is met as long as sleeping arrangements can be made without requiring opposite-sex non-couple adults to share a room. A household of four adults, two male and two female, would need at minimum two separate bedrooms under the room standard; in a three-bedroom house this is achievable.

The Space Standard

The space standard calculates the permissible number of occupants based on the number and size of rooms available for sleeping. The calculation assigns a number to each room based on its floor area: a room of 110 square feet or more counts as one person; 90 to 110 square feet counts as half a person; 70 to 90 square feet counts as a quarter of a person; rooms under 70 square feet cannot be counted. Children between one and ten years of age count as half a person; babies under one year are not counted.

Adding up the capacity of all habitable rooms, including bedrooms and living rooms, and comparing with the number of occupants determines whether the space standard is met. In a standard three-bedroom house with reasonable-sized bedrooms and a living room, the space standard would typically permit six to eight people before statutory overcrowding is reached.

Practical Implications

Statutory overcrowding is an offence under the Housing Act 1985 for landlords who knowingly permit it and for occupants who cause it. Local housing authorities can take enforcement action against landlords whose properties are statutorily overcrowded. For tenants living in overcrowded conditions, demonstrating statutory overcrowding can support a higher priority banding on the housing register when applying for social housing.

Summary

A three-bedroom house is legally overcrowded if opposite-sex non-couple adults over ten are required to share a bedroom, or if the number of occupants exceeds the space standard calculation based on room sizes. The statutory standards under the Housing Act 1985 are considered outdated; the bedroom standard used in housing surveys is more stringent. Overcrowding is an offence and can support higher housing register priority.