One of the things we look for during the garage inspection with an attached garage is the fire separation wall missing between the house and garage. In general the wall should be drywalled (5/8 inch thick) and complete with no holes or openings through it. Any door through the firewall should be a rated (at least 20 min) fire door. WI firewall requirements
Additional requirements are that drywall seems should be taped and mudded with no holes or gaps through the firewall. Joints that are not taped can be no larger than 1/20 of an inch, the approximate width of a US dime. Doors going into the house should have a fire rating sticker present indicating the fire rating in minutes the door was tested to. Windows are not permitted. Checking the fire separation wall missing is something we do and is included with every home inspection. See our website for more information on scheduling an inspection.