What Inspectors Always Check in a Garage — and What Most Homeowners Store Wrong

Walk into almost any attached garage in America and you'll find a mix of vehicles, lawn equipment, paint cans, and fuel. That combination is exactly why inspectors give garages their own dedicated review rather than folding them into a general walkthrough. Attached garages sit directly adjacent to living spaces, bedrooms, and HVAC systems, which means fire and fumes have a short path to the people inside. According to Fine Homebuilding's overview of garage code requirements, the primary concern is the air barrier between the garage and the home. Carbon monoxide from a running engine, fumes from stored gasoline, and smoke from an electrical fire can all migrate into living areas if that barrier is compromised — sometimes before anyone inside realizes what's happening. Inspectors approach the garage with a specific sequence: they check the fire separation, the electrical system, the overhead door mechanics, and the storage conditions. Each category has defined standards, and failing even one of them can trigger a required repair before a sale closes. Understanding that sequence is the first step to getting ahead of it.

Ask most homeowners what separates their garage from the house, and they'll say 'a solid door.' Ask an inspector, and the answer gets more specific. The door connecting an attached garage to the living space must be a fire-rated assembly — typically rated for at least 20 minutes of fire resistance — and it must be equipped with a self-closing mechanism that brings it fully shut every time. A standard hollow-core interior door fails on both counts. So does a solid wood door that's been propped open with a doorstop or had its self-closer removed because it was inconvenient. Stewart Overhead Door's guide to garage fire protection notes that disabled self-closing mechanisms are among the most frequently cited violations during inspections — homeowners remove them for convenience without realizing they've created a code deficiency. The door frame and threshold matter too. Gaps around the frame allow fumes and fire to bypass the door entirely, which is why inspectors check the perimeter seal, not just the door itself. If your garage-to-house door doesn't swing shut on its own and latch completely, that's the first thing to address before any professional walks through.

The classic garage setup — a red gas can sitting on the floor next to the water heater, a propane cylinder leaning against the wall — is one of the most common inspection failures inspectors encounter. It looks normal because it's familiar, but it violates the clearance rules that exist specifically because gasoline vapors are heavier than air and settle near the floor. That's the logic behind the 18-inch elevation rule for ignition sources: water heaters and other appliances with open flames or pilot lights should be mounted so their ignition points sit at least 18 inches above the floor, above the zone where vapors accumulate. Storing gas cans directly beneath or beside those appliances compounds the risk. Flammable liquids should be kept in approved containers — the kind with a flame-arresting screen built into the spout — and stored away from any heat source. Propane tanks belong outside or in a detached structure, not inside an attached garage. Inspectors photograph these conditions because they represent an immediate hazard, not just a code technicality. Relocating fuel storage before inspection day removes one of the most predictable red flags from the report.

Garage electrical systems are held to a standard that surprises many homeowners: every outlet in a garage must be GFCI-protected, full stop. This applies regardless of when the home was built. Older homes weren't required to have GFCI outlets in garages when they were constructed, but InterNACHI's home inspection standards of practice require inspectors to flag any unprotected outlet as a deficiency — even in a 1970s ranch house that was perfectly legal when it went up. GFCI protection matters in garages because the environment is damp, often unheated, and used with tools and equipment that draw significant current. A ground fault in those conditions can be lethal. The second major electrical red flag is permanent use of extension cords. Running a heavy-gauge cord from a wall outlet to a chest freezer, a second refrigerator, or a workbench light — and leaving it there year-round — is treated as improvised wiring, not a temporary solution. Inspectors photograph it, note it as a fire hazard, and recommend a licensed electrician add a properly placed outlet instead. If your garage has outlets that don't have the TEST/RESET buttons on the face, or if appliances are running off extension cords, both issues are worth correcting before any inspection.

Inspectors test garage door auto-reverse function on every visit, and the method is straightforward: place a flat object — a 2x4 laid flat works, as does a piece of cardboard — on the ground in the door's path, then trigger the close cycle. A properly functioning door should reverse direction the moment it contacts the object. If it keeps closing, or hesitates before reversing, the safety system has failed. This matters beyond inspection day. Garage doors are among the heaviest moving objects in a home, and a door without a functioning auto-reverse can injure a child, crush a pet, or damage a vehicle. The Consumer Product Safety Commission has documented hundreds of injuries tied to garage door mechanisms over the years, which is why the auto-reverse requirement has been mandatory on new doors since 1993. Torsion springs — the large horizontal springs mounted above the door — get their own look from inspectors. A broken torsion spring leaves the door effectively inoperable and puts stress on the opener motor. Inspectors flag springs that show visible wear, gaps in the coil, or signs of rust. Replacing torsion springs is not a DIY task; the tension stored in those springs is enough to cause serious injury if released improperly. A garage door technician should handle that repair.

The drywall separating a garage from the living space isn't just there to keep the space looking finished — it's a fire barrier, and it has a specific performance requirement. Most jurisdictions require at least 1/2-inch drywall on the garage side of shared walls, with 5/8-inch Type X drywall required on ceilings shared with a room above. Type X drywall is formulated to resist fire for a longer period than standard board, buying time for occupants to evacuate. According to Fine Homebuilding's garage code guidelines, any penetration through that barrier — a cable chase, a plumbing line, even a small hole left from a relocated shelf bracket — compromises the fire rating of the entire assembly. Inspectors probe walls and ceilings specifically looking for these gaps, because fire and carbon monoxide travel through them before smoke detectors have time to respond. Attic access hatches located in the garage ceiling are another common problem. If the hatch isn't fire-rated and properly gasketed, it creates a direct pathway from the garage into the attic and, from there, into the rest of the home. A standard plywood hatch does not meet that standard. Inspectors note it, and buyers' agents often use it as a negotiating point.

The good news about garage inspection failures is that most of them are correctable before inspection day, and none require major construction. A methodical walk-through using the same sequence inspectors follow catches the majority of issues in under an hour. Start with the fire door: close it from the garage side and let go. It should swing fully shut and latch on its own. If it stays open or rests against the frame without latching, the self-closer needs adjustment or replacement. Check the door's face for a label indicating its fire rating — no label often means it's a standard interior door that needs to be swapped out. Next, test every outlet by pressing the TEST button on any GFCI outlet in the garage — all outlets on that circuit should lose power. Reset it and confirm power returns. Any outlet that doesn't have GFCI protection should be noted for an electrician. Move fuel storage away from water heaters and appliances, and confirm gas cans are in approved containers. Run the garage door auto-reverse test with a 2x4 on the ground. Finally, scan the ceiling and shared walls for any holes, gaps around pipes, or damaged drywall. Seal small penetrations with fire-rated caulk, available at any hardware store. That single product fixes one of the most common inspection findings without a contractor visit.