Hello!

I have a 8 month old English Bulldog named Rufus, who is 45 pounds of adorable. He has been crate trained since a week after we received him, at 8 weeks old.
The first week he was still very small he would have his occasional accidents in the home since he was still learning the ropes.
Now, after nearly 6 months of perfection, he has recently taken up relieving himself in our two small boys bedroom, my husband and my bedroom and in his crate (where he then proceeds to roll in it).
He is fed twice a day, has a very large fenced in yard to his disposal and is only crated at night when we are sleeping. We take Rufus on two walks a day where he goes to the bathroom, and he has his bathroom area in the backyard that he uses.
This last 3 week he has been going to the bathroom in the home (containing it to only the three areas mentioned before) as well as his usual outside bathroom breaks. I have upped his walks and have let him out much more, but he will hold it and then go to the bathroom inside. And when he goes in his crate he will roll around in it so I have to dragged a poo covered dog through the house to bathe him.
I am not sure how I should break him of using the bedrooms and his crate as a bathroom. Any help is gladly appreciated.