What information about a house is required to get a quote for a fire sprinkler retrofit?
Floorplan is not enough. They need to visit and take extensive measurements to engineer the system. 
If you want "bells and whistles" (there's lots of options) you need to decide on those too.

They will need to investigate the location, size, and routing of the service main as well. They should be able to determine minimum requirements for your locale by contacting the AHJ. NFPA has specific requirements too, but they only matter if adopted by your building code. This could be a very expensive gift. Significantly cheaper to get a high-end alarm system.