Garage Inspection: What Every Inspector Should Check & Document

The garage is one of the most overlooked areas during a home inspection — and one of the most dangerous when defects go unreported. A thorough garage inspection checklist covers everything from the fire separation wall between the garage and living space to the condition of the concrete slab, electrical outlets, and overhead door mechanisms. Miss something here and you're not just leaving money on the table — you're leaving a safety hazard in somebody's home.

I've seen inspectors spend forty-five minutes crawling through attics and then blow through the garage in three minutes. That's a mistake. Garages contain fire hazards, electrical issues, structural concerns, and mechanical systems that deserve the same systematic attention you give to every other part of the house.

This guide covers what to check, how to document it, and the red flags that should stop you in your tracks.

Structural Elements: Foundation, Walls, and Ceiling

Start with the bones. The garage structure tells you a lot about the overall condition of the property — and it's often more visible here than anywhere else because the framing and foundation are typically exposed.

Foundation and Slab

Walk the entire garage floor and look for:

• Cracks in the concrete slab — Hairline cracks are normal settling. Cracks wider than 1/4 inch, or cracks with vertical displacement (one side higher than the other), indicate foundation movement that warrants further evaluation.
• Slope and drainage — The garage floor should slope toward the door opening for drainage. If water pools inside the garage or you see staining patterns that suggest standing water, document it.
• Spalling and deterioration — Surface flaking, especially near the garage door threshold, is common in cold climates where road salt gets tracked in. Note the extent and location.
• Heaving or settling — Significant unevenness in the slab, especially near the foundation walls, can indicate soil movement or poor compaction during construction.

Walls and Framing

In most garages, the wall framing is exposed — which is actually a gift for inspectors. You can see things you'd never see behind drywall:

• Damaged or notched studs — Homeowners love to attach shelving by cutting into framing members. Note any structural compromises.
• Moisture staining or rot — Check the bottom plate especially. Garages are prone to moisture intrusion from both the slab and the exterior.
• Bowing or leaning walls — Sight down the wall line. Any visible deflection should be documented and evaluated.
• Pest damage — Exposed wood framing in garages is a favorite target for termites and carpenter ants. Look for mud tubes, frass, and soft or hollow-sounding wood. Our termite inspection guide covers identification in detail.

Ceiling and Roof Structure

If the garage has an open ceiling with exposed trusses or rafters:

• Check for sagging, cracking, or damaged truss members — especially the bottom chords, which homeowners sometimes cut to make room for storage.
• Look for water staining — this indicates roof leaks above.
• Verify adequate bearing — trusses and rafters should be properly seated on the top plate.

If the ceiling is finished (drywall), check it the same way you'd check any interior ceiling — staining, cracks, sagging, tape failure.

The Fire Separation Wall: Don't Skip This

The fire separation wall between an attached garage and the living space is one of the most important safety features you'll inspect. It's also one of the most commonly deficient.

What the Code Requires

The International Residential Code (IRC) requires the common wall between an attached garage and the dwelling to provide a fire barrier:

• Garage-to-house wall: Minimum 1/2-inch drywall on the garage side
• Garage beneath habitable rooms: 5/8-inch Type X (fire-rated) drywall on the garage ceiling
• No openings allowed into sleeping rooms directly from the garage
• Doors between garage and house: Must be solid wood (minimum 1-3/8 inches), solid or honeycomb-core steel, or 20-minute fire-rated. Must be self-closing.

Common Deficiencies

These are the things I see constantly:

• Holes and penetrations — Every cable, pipe, or wire that penetrates the fire separation wall needs to be sealed. Unsealed penetrations are probably the single most common fire separation defect.
• Missing drywall — Sections removed for remodeling and never replaced.
• Pull-down attic stairs in the garage ceiling — If there's living space above, the pull-down stair opening compromises the fire barrier. This is a significant finding.
• Door between garage and house not self-closing — The door must have a self-closing device (spring hinges or a door closer). Many homeowners remove these because they're annoying. Document it.
• Pet doors in the fire separation door — This completely compromises the fire barrier.

How to Document It

Be specific in your report. Don't just write "fire separation wall deficient." Describe what you found:

"The common wall between the attached garage and the living space has multiple unsealed penetrations including two cable TV lines and one HVAC refrigerant line. The door between the garage and the kitchen lacks a self-closing device. These conditions compromise the fire separation between the garage and the dwelling. Recommend sealing all penetrations with fire-rated caulk or approved firestop material and installing a self-closing device on the door."

That's the kind of finding that protects your client and protects you.

Electrical Systems in the Garage

Garages have specific electrical requirements that differ from the rest of the house. Here's what to check:

Outlets and GFCI Protection

• GFCI protection is required for all 125-volt, single-phase, 15- and 20-ampere receptacles in garages (NEC 210.8). Test every outlet with your GFCI tester.
• At least one receptacle is required — but most garages should have more for practical use.
• Check for accessible outlets — outlets should not be obstructed by vehicles or storage.

Lighting

• At least one switched light is required — verify it works and that the switch is accessible.
• Check for exposed or damaged wiring — garages see more physical abuse than interior rooms. Look for extension cords used as permanent wiring, damaged Romex, and junction boxes without covers.

Service Panel

Many homes have the main electrical panel in the garage. If so, apply your standard electrical inspection checklist plus:

• Clearance: The panel needs 30 inches of width and 36 inches of depth of clear working space in front of it. Storage in front of the panel is a common violation.
• Height: The highest breaker handle should be no more than 6 feet 7 inches above the floor.
• Labeling: All circuits should be identified.

Garage Door and Opener Safety

The garage door is the largest moving component in most homes. It's also capable of causing serious injury or death — overhead doors can weigh 300 to 500 pounds.

Manual Door Inspection

• Operation: Open and close the door manually. It should move smoothly without binding, sticking, or excessive resistance.
• Balance test: With the opener disengaged, lift the door halfway and release. A properly balanced door should stay in place, rising or falling no more than a few inches.
• Springs: Check the condition of extension or torsion springs. Worn, rusted, or damaged springs are a safety hazard. Note: torsion springs are under extreme tension — never attempt to adjust or test them beyond visual inspection.
• Tracks and rollers: Look for bent tracks, worn rollers, and loose mounting brackets.
• Weather sealing: Check the bottom seal and side/top weatherstripping.

Automatic Opener Safety

Every automatic garage door opener installed after 1993 is required to have two safety features. Test both:

1. Auto-reverse on contact: Place a 2x4 flat on the floor in the door's path. Close the door. It must reverse upon contacting the board. If it doesn't reverse, that's a significant safety defect — document it immediately.

2. Photoelectric sensors: The sensors (mounted no more than 6 inches above the floor on each side of the door) should stop and reverse the door when the beam is interrupted. Wave your foot through the beam while the door is closing — it should reverse.

Also check:

• Mounting security — the opener should be firmly mounted to the ceiling framing, not to drywall or lightweight brackets.
• Emergency release — verify the red emergency release handle is present and accessible.
• Door lock engagement — if the door has a manual lock, verify it doesn't engage when the opener operates (this can damage the opener and the door).

Ventilation and Air Quality

Garages produce and accumulate hazardous fumes — vehicle exhaust, stored chemicals, gasoline vapors, and paint fumes. Proper ventilation matters.

What to Check

• Exhaust ventilation — Does the garage have any mechanical exhaust? While not always required by code for residential garages, it's a best practice, especially in attached garages.
• Carbon monoxide intrusion — Check for gaps, penetrations, or ductwork connections between the garage and the living space that could allow CO migration. HVAC returns in the garage are a major red flag — furnaces and air handlers in the garage should not draw air from the garage space.
• CO detectors — Verify that CO detectors are installed in the dwelling adjacent to the garage, per current code requirements.

Floor Condition and Drainage

Beyond structural cracks (covered above), evaluate the floor's overall condition:

• Coating and sealing — Note whether the floor is sealed, painted, or bare concrete. Unsealed concrete absorbs oil and chemical spills.
• Tripping hazards — Raised edges, significant cracks, or transition strips between the garage and adjacent spaces.
• Floor drains — If present, check that they're functional and not clogged. Note: floor drains in garages must not connect directly to the sanitary sewer in many jurisdictions — they should connect to a properly trapped and permitted drain.
• Moisture — Look for efflorescence (white mineral deposits) on the slab surface, which indicates moisture migrating through the concrete.

Storage Hazards and Vehicle Clearance

While inspectors don't typically evaluate personal property, you should note conditions that create safety hazards:

Storage Issues to Document

• Flammable materials stored near ignition sources — gasoline containers next to the water heater, for example.
• Items blocking the electrical panel — this is a code violation, not just a storage preference.
• Overhead storage that compromises structural members — heavy storage hung from trusses or rafters that weren't designed for it.
• Items blocking egress — the garage should maintain a clear path to all exit doors.

Vehicle Clearance

Note if the garage dimensions appear inadequate for modern vehicles. While this isn't a defect per se, it's useful information:

• Standard single-car garage: 12 feet wide × 20 feet deep minimum
• Standard two-car garage: 20 feet wide × 20 feet deep minimum
• Clear height: Minimum 7 feet, ideally 8 feet or more

If the garage is too narrow or shallow for typical vehicles, note it as a functional limitation.

Putting It All Together: Your Garage Inspection Checklist

Here's a quick-reference checklist you can use in the field:

Documentation Tips for Better Reports

The garage section of your report should tell a clear story. Here's how to make it count:

1. Photograph everything — Take wide shots of each wall, the ceiling, the floor, and the door. Close-ups of every defect. Photos of the fire separation wall penetrations, the GFCI test results, and the auto-reverse test.

2. Be specific about locations — "Left wall, approximately 4 feet from the garage door opening" is better than "garage wall."

3. Categorize by severity — Separate safety hazards (failed auto-reverse, compromised fire separation) from maintenance items (minor slab cracks, worn weather seal).

4. Include recommendations — Don't just describe the problem. Tell the client what needs to happen: "Recommend a qualified electrician install GFCI protection on all garage receptacles."

If you're spending too much time typing up garage findings after the inspection, consider a voice-first approach. ReportWalk for iOS lets you dictate findings as you walk through the garage — the app structures your observations into a professional report section so you can stay focused on the inspection instead of your keyboard.

Common Red Flags That Demand Immediate Attention

Some garage findings should elevate your concern level immediately:

• Failed auto-reverse on the garage door — this is a child safety issue. Emphasize it in your report.
• Compromised fire separation wall — especially large openings or missing drywall sections.
• Evidence of vehicle impact on structural members — cracked or displaced framing from a car hitting the wall.
• Active water intrusion — standing water, active leaks, or significant moisture damage.
• Electrical hazards — exposed live wiring, no GFCI protection, overloaded circuits.
• Carbon monoxide pathways — any direct air connection between the garage and living space.

These aren't "monitor and maintain" items. They're "fix before someone gets hurt" items. Your report language should reflect that urgency.

Final Thoughts

A thorough garage inspection takes 15 to 20 minutes — not three. The garage contains safety-critical systems (fire separation, electrical, door mechanisms) that directly impact the occupants' wellbeing. Give it the attention it deserves, document what you find with clear language and good photos, and your clients — and their agents — will notice the difference.

For more inspection checklists and field guides, check out our home inspection checklist and fire safety inspection guide.