To dream of a paintbrush for houses represents a plan of action for change. What you are doing or how you are thinking that forces a change of intentions or feelings. It may also reflect confidence in knowing you can change something or your awareness of the potential to change.
To dream of an art paintbrush represents your awareness of yourself doing something to be noticed or recognized for. It may also mean you are doing something to give yourself a self of accomplishment. Doing something you know others will see.