where can I find details of required parking space markings?

Answer 1

First, you need to specify what country this question applies to.
Second, the local jurisdiction is probably important.
Third, do you mean 'normal' spaces, or those reserved for the physically challenged. (forgive me if that is not the accepted term).

My advice, ask your local courthouse.

Answer 2

Parking space requirements generally are 4800x2400mm. You can find this information is the AJ metric Handbook, or its also defined within the Building regulations, and has details of Accessible parking spaces also

www.planningportal.gov.uk