I can't figure out where but I'm pretty sure Alfie doesn't own the house and said it in a vlog not too long ago. And I think it makes sense, that's why he decided to buy a smaller house right next to it for himself. He also seems somewhat reluctant to do anything on the main property, for example anything to do with the outside he will do on his side, like the skate ramp (granted this is ugly and I wouldn't want to ruin my land with this either) or even his vegetable garden which could have looked nice on the main big garden. He didn't even have a place inside for his computer to properly sit and work and had to use Zoe's office to stream. The main big bathroom isn't even used by him at all, he probably only uses the smaller one connected to their bedroom. I just never felt like he owned the house. Of course he might own a part of it but doesn't want to get too attached to it for some reason...