It is assumed that this Q&A refers to the statutory provisions as they apply in England, on 24 January 2024. Section 78 of the Building Act 1984 (BA 1984) is engaged where it appears to a local authority that a building or structure, or part of a building or structure, is in a dangerous state and that immediate action should be taken to remove the danger. It authorises the authority to take ‘such steps as may be necessary for that purpose’ (BA 1984, s 78(1)). BA 1984, s 78(3) provides for recovery of expenses reasonably incurred from the building owner ‘subject to this section’. BA 1984 defines ‘owner’ at BA 1984, s 126, generally the person receiving, or entitled to receive, a rack-rent for the building, and BA 1984, s 78(5) requires that the court inquire whether the local authority might reasonably have proceeded under BA 1984, s 77(1) (ie