Pink, First I think we need to address the question of ownership. Do you own your property? Or are you renting or leasing yourself and just want to offer a room to your friend? If you're in a lease/rental situation that Adverse Possession is a mute point.
But If you own your property and want to save yourself the added cost and burden of hiring an attorney you may just want to consider having your visitor sign a visitor agreement crafted by you. You could extrapolate from the following definition as it pertains to the Department of Real Estate definition of Adverse Possession.
Personally, I always try to avoid attorneys if at all possible. I'm not aware of one that will take on any type of case for less than a $1000 retainer. If nothing else try http://www.legalzoom.com for openers. Look for a lease/rental agreement with terms and conditions. Demand that your visitor sign it before you allow him/her to take possession and I think you'd be good to go.
Below are some link references and a brief summary for Adverse Possession. Good luck.
http://:www.dre.ca.gov/pdf_docs/ref_book/ref06.pdf+what+is+adverse+ target="_blank" rel="nofollow">http://docs.google.com/viewer?a=v&q=cache:prE-_JgZXNEJ:w
TRANSFER OF INTERESTS IN REAL PROPERTY 109
Adverse possession. The actual physical possession of property has always been accorded considerable weight in connection with a variety of rights and obligations. Immediately upon occupying property, an adverse possessor acquires a title to the property good against all the rest of the world except the state and the true owner. Such occupation may ripen into legal title by adverse possession if the possession is:
1. by actual occupation;
2. open and notorious;
3. hostile to the true ownerâ€™s title;
4. under claim of right or color of title;
5. continuous and uninterrupted for a period of five years; and
6. accompanied by payment of all real property taxes for a period of five years.
Since title by adverse possession cannot be traced from the county recorderâ€™s office, it is neither marketable nor insurable until perfected by court decree. Title by adverse possession usually cannot be acquired against a public body.
I know it seems like a joke unfortunately adverse possession, the way I understand the law, protects the squatter from the moment they move in. (See an attorney for precise information.) It was a humorous way to get the point across but it wasn't a joke. :-)
However, if it's a Friend...take care on the steps you tred. It can be great, or it can be ugly (emotional ties). Maybe he's understanding to your wants and will move when asked, who knows...but it's something that should be hashed out and set your house rules (especially if you have a spouse that opposes the situation).
Take care of your family first, then your friends IMO.
Please see page 4 of the following document referencing what constitutes a â€œlodgerâ€ as a start. Depending on how well you know this person; and more importantly, to make sure there are no misunderstandings in the future, you may want to have an agreement drawn up by a lawyer protecting your rights to require your friend to leave upon your verbal request. http://docs.Steven-Anthony.com/Landlord-TenantGuideCA2010.pdf