Most places that have granny flats will say so. Thus if you are looking in Zip or Realtor.com just check the details and it should say. On the MLS realtors will always put in the comments if there is a granny flat. There is not really a granny flat field. There is an optional field for an extra room, but generally realtors will enter granny flat or detached studio in the comments section. It does make the search somewhat manual. When a listing is imported from realtor.com from an MLS service since there is no seperate granny flat field in the MLS, there is no granny flat field in realtor.com either.
