Back when I was an indulter, I attended a private Mass in a home said by an FSSP priest (who is not their Superior General).
I don't know what the correct canonical answer to the question is, but to me it would seem the whole house would become an immediate relic once Our Lord had been there physically.
For that reason, I have always been very mixed on the subject.
I do not think you could treat your house as any old house after that point without risking impiety.
But again, that might just be my own tenderness on this particular point.