A good home inspector will go over every inch of the home, making sure that what is there is in sound condition and good working order. And if not, the inspector will make note of what needs to be corrected, and recommend what types of specialists are best for which tasks.
The inspector will do a thorough review of the home:
Structure – foundation and framing – how the home is settling, water issues, air escape issues, wood destroying pests
Exterior – from the house itself to railings, porches and driveways
Roof – makes sure it is in good working order (shingles in tact, no water build up, slope is true)
Plumbing – makes sure system was correctly installed and/or is safe (no leaks or incorrect installations)
Electrical – makes sure it was installed correctly and is safe, from the electric panel to junction boxes and outlets
Heating – makes sure water is moving correctly throughout the home, including ductwork, no water or moisture problems, no physical damage to system
Air Conditioning – makes sure air is moving correctly throughout the home, including ductwork, no water or moisture build up, no physical damage to system
Interior – looking for damage caused by anything from water to insects
Ventilation – of air and moisture throughout the home, including looking at insulation
Fireplaces – the entire structure from chimney to flue to how the heat is leaving the fireplace
And after the home inspection, the inspector should provide you with a detailed report on what they found during their inspection.