InterNACHI Home Inspection Checklist: 5 Areas to Cover

You found a listing you like, or you're about to sell your house, and now you want to know what a real inspector actually checks. Searching for an internachi home inspection checklist is a smart move before closing day, because it tells you exactly what standards a professional follows, instead of relying on a walkthrough with your gut feeling. Most free checklists online are vague or outdated, which leaves buyers and sellers guessing about what actually gets tested.

This article breaks down the five major areas every InterNACHI-certified inspector evaluates, from roof and exterior condition to electrical and plumbing systems. You'll see what's covered under the Standards of Practice, what typically gets flagged, and where a checklist alone falls short of a hands-on evaluation with tools like thermal imaging and moisture meters.

We inspect homes across the Alabama Gulf Coast every week, so this list reflects what we actually look for on site, not just textbook categories. Whether you're a first-time homebuyer trying to understand your inspection report or an agent prepping a client, you'll walk away knowing what a thorough home inspection checklist should include and why cutting corners on any of these five areas can cost you later.

1. Roofing and attic systems

Roofing sits at the top of every InterNACHI checklist because water intrusion causes more long-term damage than almost any other defect category. The InterNACHI Standards of Practice require inspectors to examine the roof covering, drainage systems, flashings, skylights, chimneys, and any other roof penetrations from the ground, the eaves, or by walking the surface when it's safe to do so. Attic access is part of the same section, since a roof problem almost always shows up first as staining, mold, or wet insulation overhead.

What the checklist covers

A complete roofing and attic checklist includes the covering material and its remaining service life, gutter and downspout function, flashing around vents and chimneys, and soffit and fascia condition, and our essential steps for a roof inspection in Alabama walk through each one in order. Inside the attic, the inspector documents insulation type and depth, ventilation (ridge vents, soffit vents, gable vents), signs of past or active leaks, and the condition of any exposed framing or ductwork. Bathroom and kitchen exhaust fans that vent into the attic instead of outside also get flagged here, since that's a moisture problem waiting to happen.

Common defects inspectors flag

• Cracked, curling, or missing shingles

• Rusted or improperly lapped flashing

• Clogged or disconnected gutters causing water to pool at the foundation

• Insufficient attic ventilation leading to heat buildup

• Water stains on rafters or sheathing with no obvious active leak

• Undersized or damaged insulation

A roof leak you can't see from the ground is exactly what a checklist alone can miss.

How Trinity Home Inspections evaluates it

Trinity doesn't stop at a visual scan from the driveway. We use FAA-licensed drone technology to inspect steep, high, or unsafe roofs that other inspectors write off as

2. Exterior and structural components

Once the roof is covered, the InterNACHI Standards of Practice move the inspection down to the walls, foundation, and grading that keep everything else standing. This section matters because structural movement often starts small, a hairline crack or a slightly uneven porch, long before it becomes a costly repair. Buyers relying on curb appeal alone miss the details that a trained eye catches in ten minutes.

What the checklist covers

A thorough exterior and structural checklist includes siding and trim material, exterior doors and windows, decks, porches, steps, and railings. Inspectors also check grading and drainage around the foundation, walkways and driveways for trip hazards, and visible foundation walls for cracking, bowing, or settlement. Vegetation touching the siding and any signs of wood-destroying pests get noted too, since Gulf Coast humidity accelerates both.

Common defects inspectors flag

• Negative grading that pushes water toward the foundation

• Cracked or spalling foundation walls

• Rotted trim, fascia, or deck framing

• Loose or missing handrails on stairs and decks

• Gaps around window and door flashing

A foundation crack that looks cosmetic today can be a structural warning sign tomorrow.

How Trinity Home Inspections evaluates it

We walk the entire perimeter and use moisture meters to check for hidden water intrusion at the base of exterior walls, not just what's visible to the eye. Grading issues get documented with photos showing slope direction, so buyers understand exactly where water is headed and why it matters before closing.

3. Electrical systems

Electrical problems rarely announce themselves until something sparks, trips, or stops working altogether, which is why the InterNACHI Standards of Practice treat this section as a safety priority, not just a checklist item. Inspectors evaluate the service entrance, panel, wiring methods, and every readily accessible outlet and switch in the home. Alabama's older housing stock along the Gulf Coast still has plenty of homes with outdated wiring, so this section carries extra weight here, and our electrical safety checklist for Alabama homes covers what to watch for.

What the checklist covers

A proper electrical systems checklist includes the main panel and breaker labeling, service amperage, grounding and bonding, and the condition of visible wiring in the attic, crawlspace, and garage. Inspectors also test GFCI and AFCI protection in required locations like kitchens, bathrooms, and exterior outlets, and check that smoke and carbon monoxide detectors are present and functional.

Common defects inspectors flag

• Double-tapped breakers or overfilled panels

• Missing GFCI protection near water sources

• Aluminum wiring or outdated fuse panels

• Reversed polarity or open grounds at outlets

• Exposed splices without a junction box

A missing GFCI outlet costs pennies to fix, but ignoring it can cost a life.

How Trinity Home Inspections evaluates it

Trinity tests every accessible outlet in the house individually instead of sampling a few rooms, which exceeds what state standards require. We also carry combustible gas leak detectors to catch issues near electrical panels and appliances that a visual check alone would never reveal, giving buyers a fuller picture before they sign anything.

4. Plumbing systems

Water damage from a slow leak can hide behind walls for months before anyone notices a stain, which is why the InterNACHI Standards of Practice require inspectors to trace supply lines, drains, and fixtures throughout the home. Inspectors run water at every sink, tub, and shower, flush toilets, and check the water heater for age, venting, and safety features. Gulf Coast homes with older galvanized piping or slab foundations get extra attention here, since repairs in those systems tend to run expensive.

What the checklist covers

A complete plumbing checklist for homebuyers includes visible supply and drain piping, water heater condition and TPR valve function, fixture operation, water pressure, and visible shut-off valves. Inspectors also note the main water shut-off location and check for functional flow at the farthest fixture from the source.

Common defects inspectors flag

• Active or past leaks under sinks and around toilets

• Corroded or mismatched piping materials

• Water heaters past their expected service life

• Poor water pressure at upper-floor fixtures

• Missing or improperly routed TPR valve discharge lines

A slow drip under a cabinet today is a rotted subfloor a year from now.

How Trinity Home Inspections evaluates it

Trinity checks every accessible fixture rather than a sample, and we offer add-on sewer scope inspections for buyers concerned about older clay or cast iron lines running under the yard. That extra step catches root intrusion and pipe collapse long before a standard walkthrough would ever reveal the problem.

5. HVAC and interior systems

Heating and cooling systems work harder on the Gulf Coast than almost anywhere else in the country, running near constant through humid summers, which means the InterNACHI Standards of Practice require inspectors to check both function and age here. Inspectors turn on the system through normal controls, check temperature differential at the vents, and inspect visible ductwork, along with interior components like walls, ceilings, floors, stairs, and doors that get walked past every day without a second look.

What the checklist covers

A thorough HVAC and interior checklist includes the furnace or heat pump, air handler, ductwork condition, thermostat function, and condensate drainage, the same items covered in our HVAC inspection checklist for homeowners. Inside, inspectors check windows and doors for proper operation, walls and ceilings for cracking or water staining, and flooring for damage or unevenness that could point to a structural issue elsewhere.

Common defects inspectors flag

• HVAC systems past 12 to 15 years old with no recent service

• Clogged or disconnected condensate drain lines

• Ductwork disconnected or crushed in the attic or crawlspace

• Windows that won't stay open or seal properly

• Ceiling stains unrelated to the roof, often from HVAC condensation

An aging HVAC system might still run fine today and still leave you with a five-figure replacement bill next summer.

How Trinity Home Inspections evaluates it

We use infrared scanning to spot hidden home issues behind walls and ceilings that point to insulation gaps, duct leaks, or moisture the naked eye would miss entirely, giving buyers a clearer picture of what's really going on inside the home.

Putting your checklist to work

A free internachi home inspection checklist gives you a good starting point, but checklists don't catch a hidden roof leak, a failing HVAC compressor, or a foundation crack that's actually structural. That takes someone on-site with drone tools, thermal cameras, and moisture meters who knows what Gulf Coast humidity, storms, and soil conditions do to a house over time. Use the five areas above to ask sharper questions during your own walkthrough, then bring in a certified inspector to verify what you can't see or test yourself.

Buying new construction adds its own wrinkle, since builders miss things too, and a checklist won't tell you whether workmanship meets code before you close. If you're closing on a new build or nearing the end of your builder's warranty, don't wait until problems show up on their own. Book a new construction home inspection on the Alabama Gulf Coast with Trinity Home Inspections and get a full report before your coverage runs out.