Positive or negative grade: drainage
Foundations
Siding and gutters
Chimneys and roofing

Interior Evaluation

Basements and crawlspaces

Structural
Load-bearing integrity
Signs of leaks
Insulation
Plumbing
Integrity of piping systems

Mechanical
Integrity of ducts and vents
Electrical
Integrity of wiring systems

First, second, third floors

Structural
Doors, windows: level and plumb
Proper attachment, signs of leaks
Plumbing
Supply line function (flow)
Drain, waste, and vent function

Mechanical
Furnaces, ducts, vents, combination and return air systems
Hot water heaters
Air conditioning systems

Electrical
Service entrance and sub-panels
Visible wiring
Outlets and fixtures
GFCI protection

Attics

Structural
Leaks
Insect infestation
Insulation
Positive attachment
Plumbing
Piping and terminations

Mechanical
Ducting, vents, terminations

Electrical
Switches, fixtures, junction boxes