If, after a property buyer has taken transfer, it turns out that a structure on the property is unlawful for lack of local authority planning permission and approved plans, who must fix the problem? Does the buyer have any claim against the seller? We address those questions in the context of the general rule that building permission is legally required before any construction can begin.

We discuss also why both parties should take steps upfront to avoid any disputes over the issue – why buyers should ask for plans before even making an offer, and why sellers should have them available.