The InterNACHI Standards of Practice, Explained

The InterNACHI Standards of Practice is the most widely referenced definition of what a US home inspection covers. If you are studying for licensing, writing your pre-inspection agreement, or explaining to a client why you did not move the seller's furniture, the SOP is the document you keep coming back to. Here is a plain-language walkthrough — and what it means for how you write reports.

What the InterNACHI SOP is (and is not)

The SOP defines the minimum scope of a residential home inspection: a non-invasive, visual examination of a home's readily accessible systems and components. It is published free by InterNACHI (the International Association of Certified Home Inspectors) at nachi.org/sop, and many US states either adopt it, reference it, or model their own standards on it.

Just as important is what it is not: it is not a code-compliance inspection, not an appraisal, not an invasive investigation, and not a guarantee. The SOP explicitly does not require inspectors to move furniture, enter unsafe crawlspaces, dismantle equipment, or predict remaining life of systems. Those exclusions protect you — but only if your report and agreement reference them.

The systems the SOP requires you to inspect

The SOP is organized by system, and a compliant report generally addresses each of them:

• Roof (coverings, drainage, flashings — from accessible vantage points)
• Exterior (cladding, doors, windows, grading, walkways)
• Basement, foundation, crawlspace, and structure
• Heating and cooling systems
• Plumbing (supply, drains, water heating, fixtures)
• Electrical (service, panels, wiring methods, receptacles)
• Fireplace and fuel-burning appliances
• Attic, insulation, and ventilation
• Doors, windows, and interior

For each system, the SOP describes what the inspector shall observe and what they shall report — typically deficiencies that are safety hazards, significantly deficient, or at the end of service life.

What this means for your reports

A report structured around the SOP's system list is easier to defend and easier to read. Every finding should sit under its system, paired with a photo, a clear description, and a severity the client can triage. Limitations matter as much as findings — if the crawlspace was inaccessible, the report should say so, because the SOP only obligates you to inspect what is readily accessible.

If you are building your own report structure, our free home inspection report template and inspection checklist follow this system-by-system shape.

InterNACHI SOP vs ASHI SOP vs state standards

The ASHI Standard of Practice covers substantially the same ground with different wording; most inspectors comply with both simultaneously without trying. The important overrides are state-level: licensed states like Texas (TREC) publish their own mandatory standards and even report forms. Always follow your state's standard where one exists — the InterNACHI SOP is the floor, not the ceiling.

Where InspectPro Solo fits

InspectPro Solo is a photo-first reporting app designed to make the system-by-system discipline automatic: 30+ built-in inspection areas with item checklists, photos tagged to the exact item with severity ratings and comments, and a branded PDF generated on your phone before you leave the site. You can customize areas to mirror the SOP sections you report under and save the structure as a reusable template. It does not determine compliance for you — the judgment stays yours — but it keeps the documentation shape consistent on every job.