Do I need a separate inspection for each unit in a duplex or fourplex?

No — it is one inspection and one report, but every unit is evaluated individually rather than sampled. This is the most common misunderstanding about multifamily work. We do not inspect one unit and assume the other matches it, because in practice the units rarely do match: they were renovated at different times, by different people, for different tenants, and the failure you are buying is usually in the one nobody showed you. Each unit carries its own heating equipment, water heater, electrical panel, plumbing fixtures, appliances, windows and entry, and each of those gets its own age, condition and safety assessment. On top of that we map what the units share — the roof and envelope, the foundation, the water service and main shutoff, the sewer lateral, the sump pump and its discharge, common stairs and the shared basement or attic — because a shared component is a shared future expense and it belongs in a different column of your budget than a unit-level repair. The scope multiplier is real: a fourplex may hold four furnaces, four water heaters and four panels, and site time scales roughly with the number of units rather than with square footage. That is why a multifamily inspection is scoped per unit. What arrives is a single photo-mapped report organized so you can read the building unit by unit and then read the shared systems on their own. For a scope specific to your building, use the free instant quote tool below or call us with the unit count.