do (something) up
Definition: to repair, decorate and improve something such as a building or flat.
(This phrasal verb has more than one meaning)
E.g.1: I spent a month doing up the flat and I think it’s quite nice now.
E.g.2: If you do the building up you’ll get more money for it when you sell it.
This phrasal verb can be separated. (E.g. 2)