The property will be inspected under the provisions of Part X of the Housing Act 1985 as amended for UK immigration purposes. 

An applicant must provide evidence that there will be adequate accommodation in the UK, without recourse to public funds. An independent accommodation report to establish that the property will not be overcrowded after applicant arrival and that it is suitable for living under the Housing Act 1985.  The report/letter should confirm the number of bedrooms and other rooms in the property, details of the current occupiers, and his details as the proposed future occupier. 

Accommodation is not adequate if it is, or will be, overcrowded Under paragraph 6 of the Immigration Rules, the meaning of overcrowded is the meaning in the Housing Act 1985, the

Housing (Scotland) Act 1987 or the Housing (Northern Ireland) Order 1988 (as appropriate). Accommodation is not adequate if it does or will contravene public health regulations. …..  Decision makers should expect to see evidence that the family unit of the applicant/sponsor and any dependents have or will have exclusive use of at least the bedroom(s) required for the number, age and gender of members of their family unit.