Moving to a new house

[Terpe]

My partner is looking of a new house where he can move by next month. His present home is smaller and he doesn't like the landlord. He's going to check a house and its cheaper and bigger one. My worries is does it affect my application in October if he is renting a new house. Does embassy needs an evidence that he have been staying in that house for a long time? Hope you can help. Thanks

No need to worry about that. It's fine.
Plenty of folks move to a new place prior to bringing their partner here.