Posted: 28/08/2013 at 12:17
From : http://www.bporco.ie/live/newstalk/568.html
"There is a legal presumption that every wall or fence dividing two people’s property running down the boundary line is a party wall or fence. If this is the case then you are entitled to paint on it because it is on your side of the boundary. If the fence is fully located on your neighbour's side then you cannot."