We handle requests for house blessings all of the time, rent houses, apartments, once a call by the owner to bless a brand new hotel!
It is the very best houswarming.
Priest will be happy to bless any of your religious items at the same time.
Ask the secretary if Father likes baked goods, if he has any food issues (diabetic, etc.). Some priests like to schedule a house blessing around supper time and they like eating with the parishioner. If you’d like to share a meal with Father, ask to schedule in the evening and break bread together.
If it is scheduled for afternoon, you could to a cup of tea/coffee and cookies.
Father does not expect an offering. Sometimes people give one, but, it is not at all required.