You have my sympathies. It can get very frustrating indeed! Perhaps you should consider confining them to one room that they're most familiar with (your lounge or bedroom for instance). That's what I do with mine and he's perfectly fine in our large bedroom. Before I go out, I check anything worthwhile is removed off the floor and all cords and any other potential dangers are out the way. I don't think they need a whole house to move around in and it kind of is like a 'den' for them. It also adds significant control to the whole pooing/weeing situation too!
