Total Home Inspection Checklist: Every System, Equal Depth

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A total home inspection checklist is not a quick walkthrough sheet. It is an encyclopedic list of every system, component, and condition the inspector is expected to evaluate during a general residential inspection. The American Society of Home Inspectors (ASHI) and the International Association of Certified Home Inspectors (InterNACHI) both publish Standards of Practice that define what “total” coverage actually means. The list below is organized around those documents so buyers, sellers, and homeowners can use it as a single reference for the full scope of a residential inspection.

What “Total” Means Under ASHI and InterNACHI Standards

The ASHI Standards of Practice and the InterNACHI Residential Standards of Practice define a general home inspection as a non-invasive visual examination of the readily accessible systems and components of a residential dwelling. “Total” in that context means the inspector covers each of the major categories below, not that every concealed item gets opened up. A complete checklist mirrors those categories one for one, then expands each into a series of conditions to verify. Anything outside the readily accessible scope, such as buried piping or sealed wall cavities, is excluded by the standards themselves.

This article walks each major category in equal depth rather than emphasizing one system over another. For a buyer-side companion sheet that condenses these same categories into a portable format, the buyer’s printable checklist pairs well with this longer reference.

Site, Grounds, and Drainage

The outdoor walk begins at the property line. The inspector evaluates lot grading away from the foundation, gutter discharge, downspout extensions, walkway condition, retaining-wall lean, driveway settlement, deck and porch attachment, exterior stair geometry, handrail height, and yard drainage features. Vegetation contact with siding, tree limbs against the roof, and soil-to-wood contact along sills are all noted. Drainage findings often drive the largest dollar amounts on the entire report because chronic moisture against a foundation can produce structural and indoor-air-quality consequences for years.

Foundation and Structure

Foundation walls, slab edges, crawlspace piers, basement floors, and any visible framing get examined for cracking pattern, lateral displacement, efflorescence, prior repairs, water staining, and rot. Common notations include stair-step cracks, horizontal cracks indicating lateral pressure, slab heaving suggestive of expansive soils, and beam pockets with poor bearing. In Front Range Colorado, expansive clay and bentonite soils make slab and basement-floor heave a recurring finding. A total checklist captures both the present condition and the trajectory implied by patterns.

Exterior Cladding, Trim, and Openings

Siding type is identified (lap, panel, masonry, stucco, fiber cement) along with caulking integrity at penetrations, lap joints, flashing at intersections, and ground clearance. Trim boards, fascia, soffit vents, and rake edges are checked for rot, peeling, and previous patching. Windows are inspected for sash operation, broken seals visible as fogging, sill condition, and exterior caulk. Exterior doors get tested for weatherstripping, threshold, lockset operation, and deadbolt strike alignment.

Roof Covering, Penetrations, and Drainage

The roof section captures covering type (asphalt, wood shake, metal, tile, membrane), apparent age, granule loss, lifted or curled shingles, exposed nail heads, ridge condition, valley flashing, and step flashing at sidewalls. Penetrations such as plumbing vents, B-vents, skylights, chimneys, and HVAC curbs each get a separate line for flashing condition and caulk. Gutters, downspouts, and roof drainage are evaluated for slope, attachment, and discharge location.

Attic, Insulation, and Ventilation

An accessible attic is entered for framing inspection (truss damage, sistered rafters, prior modifications), insulation depth and type, vapor retarder presence, bath-fan and dryer-vent termination, and balanced intake-and-exhaust ventilation. Roof leak evidence shows up as staining on sheathing, rust on nails, or compressed insulation. Wiring conditions and old knob-and-tube remnants are flagged here as well.

Plumbing Supply, Drainage, and Fixtures

The plumbing section captures supply piping material (copper, PEX, galvanized, polybutylene), drain piping material (cast iron, ABS, PVC), fixture function in every room, water-heater capacity and age, TPR valve and drain pan, expansion tank where required, shutoff locations, and visible cross-connections. Functional flow and drainage at each fixture is tested. Polybutylene supply, galvanized of unknown age, and orangeburg drainage all draw attention on a total checklist because of replacement cost.

Electrical Service, Panel, and Branch Circuits

Service entry is identified (overhead or underground, amperage), the panel is opened to examine breaker labeling, double-tapped lugs, aluminum branch wiring, federal-pacific or Zinsco panels of concern, neutral-and-ground bonding, GFCI protection in wet locations, AFCI coverage in sleeping areas, exterior receptacle weather covers, and smoke and carbon-monoxide alarm placement. The ICC-adopted electrical code through each jurisdiction sets the underlying requirements that the inspector cross-references.

Heating, Cooling, and Ventilation Equipment

Furnace or boiler age, BTU input, combustion-air supply, flue and venting condition, filter access, and operating cycle are all checked. Air conditioning condensers are evaluated for level pad, refrigerant-line insulation, and approximate age from serial-number lookup. Heat pumps add reversing-valve and defrost considerations. Distribution captures duct condition, return placement, and supply-register function. Humidifier and energy-recovery ventilator components are noted where present.

Interior Rooms, Floors, Walls, and Ceilings

Each interior room is walked for floor levelness, wall plumb, ceiling staining, door and window operation, receptacle and switch function, and finish condition. Stairs are checked for handrail continuity, baluster spacing, riser-and-tread geometry, and lighting. Closet doors, attic access hatches, and crawlspace hatches are exercised.

Kitchen Cabinetry, Counters, and Appliances

Cabinetry hinges and drawer slides are operated. Counters and backsplashes are checked for separation. Sink basin condition, faucet operation, sprayer, garbage disposal, and dishwasher air-gap or high-loop are inspected. Built-in appliances (range, vent hood, microwave, dishwasher, refrigerator, ice maker) get an operating-condition note rather than a warranty.

Bathroom Fixtures, Surfaces, and Ventilation

Toilet anchor and seal, tub or shower surround grout and caulk, slip-resistance of the floor pan, faucet and diverter operation, sink trap condition, and exhaust-fan function are documented. Loose tile, deflection underfoot, and staining at the toilet base are common report items.

Built-in Appliances and Laundry

Laundry hookups (hot, cold, drain, dryer-vent material and routing, dryer-vent termination), washer and dryer operating note where present, and dryer-vent restriction risk are recorded. Vinyl flex dryer ducting is flagged because of code prohibition for transition use.

Safety Items: Smoke and CO Alarms, Egress, Garage Separation

Smoke alarms, carbon-monoxide alarms (especially relevant in Colorado where state law requires them in homes with fuel-burning appliances or attached garages), bedroom egress window size, stairway lighting, garage-to-house separation (5/8-inch type X drywall on common walls), self-closing door, and the absence of ductwork penetrating the firewall are all captured. The U.S. Fire Administration data underlines the importance of working alarms in every sleeping zone.

Garage, Driveway, and Service-Area Notes

Garage door operation, photo-eye reverse, manual-release pull, opener attachment, slab condition, vehicle-door header, and any unprotected gas-line penetrations are documented. Outbuildings, sheds, and detached garages may be included or noted as outside the scope of the standards depending on engagement.

Putting the Pieces Together

A total checklist is not a guarantee of perfection. It is a map of the territory the inspection covers under ASHI and NACHI standards. For homeowners who want the workflow side of how a credentialed inspector uses a list like this, the companion inspector’s checklist walks through the report-software and photo-documentation workflow that turns the field list into the deliverable. For the broader buying journey, the hiring-process pillar ties scheduling, vetting, and report-reading together.

Specialty Inspection Add-Ons Beyond the Standard Scope

A total general inspection follows the visual-only scope of the ASHI and InterNACHI standards, but several conditions sit outside that scope and require dedicated specialty work. Buyers who know which add-ons exist before scheduling can bundle them at booking and avoid a second mobilization fee or a delayed contingency. The most commonly requested specialty inspections fall into seven categories that each address a distinct risk class the general inspector flags but does not investigate further.

Sewer-line video scoping runs roughly $200 to $400 and pushes a camera through the main drain from a cleanout or roof vent to the municipal tap. The video reveals root intrusion, bellies, separated joints, and clay-pipe collapses that no general inspector can see from inside the house. Homes more than 40 years old, mature trees within 15 feet of the lateral, or any drain that drains slowly during the inspection are common triggers for scoping. Mold sampling, in the $300 to $500 range, includes air-cassette samples in suspect rooms and a control sample outdoors, with lab turnaround in three to five business days. Sampling is appropriate when visual mold is present, when an occupant reports symptoms, or when humidity readings exceed 60 percent in conditioned space.

Radon testing, generally $150 to $250 for a continuous-monitor short-term test, is recommended in every Zone 1 county and many Zone 2 counties under the EPA mapping. A 48-hour closed-house test produces an averaged result in picocuries per liter, with mitigation considered above 4.0 pCi/L. Thermal imaging adds $100 to $300 when scoped as a stand-alone deliverable, and it locates missing insulation, moisture intrusion behind finishes, electrical hot spots at the panel, and air-sealing failures. Asbestos sampling, usually $50 to $100 per sample with $300 minimums, is appropriate before any planned renovation in homes built before 1985, particularly for popcorn ceilings, vinyl-asbestos floor tiles, and pipe-wrap insulation.

Two engineering referrals round out the specialty list. A foundation engineer site visit, typically $500 to $1,200, follows any general-inspector note of active movement, stair-step cracking wider than a quarter inch, or sloping floors more than one inch over twenty feet. A structural engineer follow-up addresses larger questions: ridge sag, load-path concerns at a removed bearing wall, or post-and-beam connection issues in older homes. These engineering opinions carry the weight of a licensed PE stamp, which lenders and insurance carriers may require before underwriting can proceed. Bundling these add-ons at booking is generally 20 to 30 percent cheaper than scheduling them separately, and a single contact for follow-up simplifies the negotiation phase of the transaction.

References

• ASHI Standards of Practice — scope of a general home inspection — American Society of Home Inspectors
• InterNACHI Residential Standards of Practice — International Association of Certified Home Inspectors
• 2021 International Residential Code overview — International Code Council
• For Your Protection: Get a Home Inspection — U.S. Department of Housing and Urban Development