One Year Old Dog Peeing in the House?

My American cocker Spaniel still pees in the house. He had stopped, but for the last 6 months has been doing it several times a day. He pees more when I am in the house! I can't continue with him weeing in the living room and my daugter's bedroom so he is in our dining room.

I let him come in the living room regularly for affection, and let him into the garden every hour for a wee. But he pees in the house as soon as I turn my back. He has no medical problem.

I really want to help him, as at the moment we are looking at dog parks for the house as he wees too often in the dining room, but I am worried that the crate/park won't actually change things once we stop using it. I want my dog to be free in the house and to have fun with us.