And cut lengths of timber and sheet materials are usually multiples of 30cm but many people will order "8 foot" rather than 2.4m. Likewise joist and stud centre

And cut lengths of timber and sheet materials are usually multiples of 30cm but many people will order "8 foot" rather than 2.4m. Likewise joist and stud centres. However you can also get 3m or 5m, for example. Of course, most houses in the UK were built pre-metric system, so rooms will mostly be sized in feet, if they are in round units at all.