Multi-Family Property Inspections in Arizona: Duplexes, Fourplexes & Small Apartment Buildings

The short answer

A multi-family property inspection looks at both the individual units and the building-level systems that can affect the whole investment. For a duplex, triplex, or fourplex, that can mean reviewing accessible units plus the roof, exterior, site, shared plumbing or electrical conditions, common areas, and other visible systems included in the inspection agreement.

The Inspection People offers a dedicated multi-family residential inspection service with current pricing and a working unit calculator.

What gets inspected in a duplex, triplex, or fourplex?

Depending on access and the agreed scope, the inspection may include:

• roof, exterior, grading, and visible structural components
• electrical panels and visible electrical conditions
• plumbing, fixtures, drainage, and water heaters
• HVAC and other accessible mechanical equipment
• windows, doors, walls, ceilings, and floors
• installed appliances where included
• garages, exterior structures, and accessible common areas
• unit-by-unit differences in condition
• visible safety concerns and deferred maintenance

The key is distinguishing unit-specific findings from building-wide exposure.

Does every unit need to be inspected?

For a small duplex, triplex, or fourplex, inspecting every accessible unit may make sense because one unit does not automatically represent the others. Tenant history, prior repairs, remodels, leaks, HVAC maintenance, and owner improvements can create meaningful differences.

For larger properties, the appropriate scope depends on the transaction, access, building count, unit mix, and buyer goals. Do not assume a representative-unit approach is appropriate without agreeing on the scope first.

Shared systems matter

Multi-family due diligence is more than several home inspections stacked together. Shared roofs, main electrical service, plumbing, drainage, stairs, common mechanical systems, exterior assemblies, and site conditions can affect multiple units or the entire investment.

A useful report helps the buyer understand which observations appear isolated and which may have wider property implications.

How investors use the report

The report can help a buyer or investor:

• identify near-term repair and maintenance priorities
• understand whether visible issues appear unit-specific or building-wide
• decide where specialist estimates may be useful
• discuss findings with an agent, lender, property manager, or contractor
• document conditions before taking ownership
• plan post-closing maintenance with better information

The inspection is not a valuation, engineering analysis, environmental assessment, or guaranteed future repair budget unless those services are separately arranged.

How is pricing determined?

The Inspection People publishes current small multi-family pricing and a working unit calculator on the multi-family inspection service page.

Pricing depends on the unit mix and the published service structure. Larger, unusual, mixed-use, or custom-scope properties may require Iain to confirm the inspection plan before scheduling.

Multi-family vs. commercial inspection

Some properties sit close to the boundary between residential multi-family inspection and broader commercial due diligence. A duplex, triplex, or fourplex may fit the multi-family workflow, while larger apartment, mixed-use, office, retail, or light-industrial properties may need a different scope.

Compare the multi-family service with the commercial inspection service, or send Iain the address and unit count if the right path is not obvious.

Should you add a sewer scope?

A sewer camera inspection may be useful when the property has older piping, mature trees, prior drainage history, or other reasons to look inside the accessible sewer lateral. A standard visual inspection cannot see inside that buried line.

See the sewer scope service and Arizona sewer-scope guide.

What should you send before requesting an inspection?

Have these details ready:

1. Property address
2. Number of buildings and units
3. Approximate unit sizes or building size
4. Occupancy and access details
5. Due-diligence deadline
6. Known concerns or prior repairs
7. Requested add-ons such as a sewer scope

Ready to inspect the property?

Use the multi-family inspection page to review the current scope and calculator, then request the inspection with the unit mix and access details.

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