Registered Historical Residence to Bed & Breakfast

We are just beginning to evaluate the requirements for an historical residence that was previously converted into a restaurant prior to gaining registry as historical. Now the owners wish to convert it to a bed and breakfast. There are some differences in opinion between the fire marshal and building dept. if sprinklers are required. Any input would be appreciated.
Original Post
This will likely be an AHJ call regarding installation of the sprinkler system. California's Historic Buildings Code is applicable.

Having said that, the bed-and-breakfast is and R-1 occupancy group. 2007 CBC, Section 903.2.7 requires an automatic sprinkler system in accordance with Section 903.3. in all buildings with a Group "R" fire area.
Only if they keep the number of unrelated boarders and guests under 5, can it be considered a single family home. Otherwise it is a Hotel or Boarding House, which will require sprinklers. See the defenitions of Residential Classifications under ICC 310. The sprinkler requirement is in ICC 903.2.7. though it can be an NFPA 13R system which is cheaper than the standard 13 system.
Jesse,
You will need to get the historic resources report used to qualify the building for placing on the historic registry. The report will outline the nature of the building elements and composition required to be maintained or restored. Usually the ceilings where fire sprinklers are customarily installed is not a part of the historic "fabric" for maintaining or restoring thus sprinklers can be installed. There are quite a few new "tricks" for sprinklers to make them less noticeable, get in touch with a well qualified fire protection engineer.

Beyond the fire sprinklers you will need to address all the historic "fabric" for the conversion back to a residential use. Good luck
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