Under the Texas Real Estate Commission Standards of Practice, a standard TREC home inspection is a limited visual survey and basic performance evaluation of the accessible systems and components of a substantially completed 1–4 family dwelling. It establishes the minimum inspection requirements—not an exhaustive investigation of everything that could be wrong with a house.​

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Structural systems include the foundation and visible indicators of foundation performance; grading and drainage; roof coverings; roof structure and attic; interior and exterior walls; ceilings and floors; doors and windows; glazing; stairs and railings; fireplaces and chimneys; and attached porches, balconies, decks and carports. The inspector also reports visible evidence of water penetration and applicable structural deficiencies. 

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Electrical systems include the service entrance, electrical panels, grounding, breakers/overcurrent protection, accessible branch wiring, switches, receptacles, GFCI/AFCI protection and other electrical items specified by TREC.

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Heating, ventilation and air conditioning include installed heating and cooling equipment, thermostats, accessible duct systems, chases and vents, condensate drainage and related components. The equipment is generally operated with normal controls when conditions permit. 

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Plumbing systems include visible water-supply and drain/waste/vent piping, plumbing fixtures, faucets, toilets, active leaks, water pressure, water heaters, accessible gas distribution components and other plumbing components specifically identified in the TREC standards.

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Installed appliances include items such as the dishwasher, food-waste disposer, range hood/exhaust, range/cooktop/oven, built-in microwave and other appliances specifically required by the standards. Appliances are generally operated in at least one mode using normal controls.

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TREC has a separate category for Optional Systems. These aren't automatically required, but if the inspector agrees to inspect them, TREC establishes standards for how they are inspected. They include landscape irrigation/sprinkler systems, swimming pools/spas/hot tubs, outbuildings, private water wells, private sewage/septic systems and certain other built-in appliances.

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