I would expect they would want a copy of the deed, a copy of the subdivision plat, if any, and any additional easement agreements  or any documents involving setback lines.  What do you charge for that? 

By the way, I am just guessing as to what a surveyer would want.  You should speak with them to find out what they really need.  Then, negotiate a price that works for them and still allows a profit acceptable for you.  Figure your costs, time and effort.  What's it worth to you to do the job?