Timber stud walls are usually just over 5 inches in thickness. This includes the combined thickness of your studs (either 70 or 100mm), two plasterboard sheets (each 12.5mm in thickness) and the skim plaster finishes.

How thick are the walls of a timber framed house?

70mm thick walls are required for timber buildings that will be used all year round.

How thick is an exterior wall UK?

The thickness of a wall can be measured at a door or window. A solid wall will be 23cm (9″) thick plus internal plastering and external rendering (if any) and a cavity wall 30cm (11.5″) plus plastering and rendering (if any).