Law of Property Act 1925

38 Party structures.

(1) Where under a disposition or other arrangement which, if a holding in undivided shares had been permissible, would have created a tenancy in common, a wall or other structure is or is expressed to be made a party wall or structure, that structure shall be and remain severed vertically as between the respective owners, and the owner of each part shall have such rights to support and user over the rest of the structure as may be requisite for conferring rights corresponding to those which would have subsisted if a valid tenancy in common had been created.

(2) Any person interested may, in case of dispute, apply to the court for an order declaring the rights and interests under this section of the persons interested in any such party structure, and the court may make such order as it thinks fit.