Home Inspection Planning for a Duplex

03 September 2023

A duplex can contain similar-looking units with different repairs, equipment and access conditions. A useful inspection plan identifies each unit and the shared areas explicitly.

A practical approach

Confirm whether both units, the basement, utility spaces and outbuildings are included. Arrange authorized access with occupants and explain how photographs will be handled. Ask for findings to be labeled by unit and location. Do not assume that a satisfactory observation in one unit describes the corresponding feature in the other.

Repeated units do not guarantee repeated condition

In a duplex or other small multifamily property, similar rooms can have very different repair histories. A representative look at one unit is not the same as inspecting every accessible unit. Clarify the scope, tenant access arrangements and the treatment of shared spaces before booking. Mechanical rooms, common stairs and shared drainage may need as much attention as the living areas.

Document findings by unit and exact location. This prevents a repair completed in one apartment from being mistaken for work completed throughout the building. Keep occupant privacy and access requirements in mind when arranging photographs or follow-up visits. Rental, licensing and legal obligations vary by location and should be checked separately. The inspection can identify visible conditions, but it should not be presented as a complete compliance assessment unless that service is explicitly provided.

Prepare safe and practical access

An inspector can only evaluate areas that are safely accessible within the agreed scope. Stored boxes, locked doors, sealed hatches and disconnected utilities can limit the visit. The owner or authorized representative should arrange access in advance rather than expect the inspector to move heavy belongings or force a door. Keep pets managed and tell occupants how the visit will work.

Do not remove safety covers or open equipment in an attempt to help. Instead, clear ordinary walking routes and provide the relevant keys and records. If access is still restricted, ask for the limitation to be documented and consider a separate return visit. A clear explanation of what was not seen is more valuable than assuming an inaccessible area must be satisfactory.

Create one reliable home information file

A home information file can hold the inspection report, equipment manuals, service records, repair photographs and relevant approvals. Organize it by system or location so a future question can be answered without searching through unrelated messages. Keep original documents and use descriptive filenames rather than relying on memory.

Distinguish an estimate, an invoice and a completion report. They document different stages and should not be treated as interchangeable proof. Record known gaps as well as available information. A note that a concealed area was not inspected is useful context for future work. Back up digital records and avoid sharing occupants' personal information unnecessarily. The aim is a usable building history, not a large folder of documents whose meaning is unclear.

An example to work through

One apartment may have a newer water heater while the other retains older equipment. Separate records prevent a recent service invoice from being mistakenly applied to both.

What to check

List every included unit and shared area.
Arrange occupant access in advance.
Label equipment and findings by location.

Sources and further guidance

ASHI: home inspection scope and standards