When we think about exorcism (specifically of a place), we tend to think of it as an all-or-nothing deal. The exorcist comes into the building and casts out anything that isn’t an Angel. (For an example of a simple home cleansing and exorcism, see my Uncrossing instructions.)
For most common folks, a home free from all spirits is the desired goal. However, if you are a practitioner of any form of magick, you likely have a house full of familiar spirits, ancestors, helpers, nature spirits and ghosts that simply enjoy hanging around. You certainly do NOT want to cast these guys screaming into the outer abyss along with any harmful demons you exorcise.
My Guardian Angel once revealed to me a simple technique for protecting your house-familiars from a general exorcism. First, you want to perform the Uncrossing and house cleaning as described in the Uncrossing instructions – up to but NOT including sprinkling and perfuming the house while reading Psalms 90 and 91!
Instead, you will need a white candle and a piece of consecrated quartz crystal. (The candle can be consecrated as well, but the crystal *must* be, in order to keep negative spirits from attaching themselves to it.) You will also need an offering to the friendly spirits: food items such as fruits and vegetables, bread and honey, milk, water, liquor, flowers, cigars, incense, etc – whatever you know your house spirits will enjoy. Establish this offering either in your Temple space, or create a sacred space/circle around a table holding the offerings. It should be in a room or area that you will not need to exorcise.
Now, take the white candle in your right hand and the consecrated stone in your left. Beginning in the back of the house (or the place furthest away from the offerings) walk through every room as you address all friendly, familial and house spirits. Announce that you are about to exorcise the house, and that any friendly spirits who wish to stay must follow the light (your candle) and grab hold of the stone. Also announce that you have an offering set up for them in a safe place.
Once you have completed this, place the candle and stone on the table with the offerings. You have now localized all of your house spirits in one safe location. Then return to the Uncrossing instructions and perform the sprinkling and censing of the house (except for the room the offerings are in!) along with the recitation of Psalms 90 and 91.
Once the exorcisms are complete and the house is sealed and protected, return to the offering table and deal with it as you would any other offering. (I usually leave the offering there for several days.) Announce to the spirits that they are free to move around the house again – and (if it applies) break any magick circle you cast around the table.
May you AND your familiars enjoy a happy and prosperous home. :)