Commercial Outbuilding Inspection Considerations

An outbuilding is a detached, accessory structure located on the same parcel as a main building. It provides supplemental space for storage, services, or operations and is not intended for primary occupancy or use. Some outbuildings are fully equipped with mechanical, electrical, and plumbing (MEP) systems, while others are used only for storage and lack power or conditioned air.

Common outbuilding uses include storage garages at warehouses, equipment or machinery sheds at agricultural properties, and maintenance buildings or bus garages at schools. In some cases, an outbuilding may be leased to a separate tenant. That can affect inspection access and confidentiality, so clients and inspectors should confirm whether the tenant is aware of the inspection and how access should be handled on site.

Inspection Scope

The baseline scope of the International Standards of Practice for Inspecting Commercial Properties (ComSOP) excludes outbuildings. During preliminary research and client conversations, details about the outbuilding’s complexity should be gathered and the client should confirm whether it should be inspected. The proposal and agreement should then adjust the scope accordingly.

Before the inspection, it helps to clarify:

• Current use of the outbuilding and occupancy status
• Scope of inspection if included (full scope or exterior-only)
• Points of contact for access or potential confidentiality requirements
• Whether the outbuilding is supplied with utilities (electrical, water, fuel, conditioned air)

These details help determine how much time and effort the outbuilding inspection will require and how it should appear in the final report.

Reporting Practices

If the baseline scope is expanded and the outbuilding is included, reporting approaches may include:

1. Creating a stand-alone inspection report for the outbuilding
2. Producing one report for the entire property, with the outbuilding details added as a separate section or as an appendix

Outbuildings that are regularly occupied and fully equipped with utilities may warrant a separate report or an appendix. More limited scopes, such as exterior-only inspections, may fit better as a separate section within the main report.

Field Modifications

The use and occupancy status of an outbuilding often influences how it is modified over time. When an outbuilding is repurposed from its original design, equipment and system-related field modifications are common. Field modifications are changes made to a structure after construction, or to its systems after manufacture or installation.

For example, an outbuilding originally intended for storage may later be converted into a breakroom or mechanic shop. Building systems are often added or altered to support occupancy and equipment use. Examples include:

• Added electrical outlets or flexible cords used improperly as substitutes for permanent wiring
• Plumbing fixtures added without proper traps or backflow prevention
• Improperly terminated equipment exhaust or missing exhaust ventilation
• Improvised wall penetrations for exhaust, fuel lines, or drainage piping

These conditions can affect safety, structural integrity, and long-term reliability. Observed modifications should be documented, especially where hazards warrant further attention.

Utility Services

Outbuildings may or may not be supplied with utilities. When utilities are present, they may be connected to the main building’s services or provided through separate service lines or meters.

• Gas: Check for an accessible shutoff valve and look near any visible pressure regulators.
• Electrical: Look for a separate service drop or lateral, proper grounding, and accessible disconnects.
• Water: Look for proper backflow prevention and identify the location of shutoff valves.

Some outbuildings function as separate buildings with dedicated shutoffs for safety and maintenance. Some may also have dedicated meters for water, gas, and electrical service.

Additional Considerations

Because outbuildings often serve as storage spaces, proper storage of hazardous materials and safe clearances from life safety features and building systems matter. Outbuilding roofs often lack a permanent means of access, so clients should clarify whether a drone inspection will be included or whether the roof will only be inspected from the ground.

The scope of an outbuilding inspection should be agreed upon in writing so it aligns with the client’s risk tolerance and inspection objectives. Outbuildings can vary widely—from simple storage structures to fully equipped workspaces—so excluding them from the baseline ComSOP makes advance discussion essential.

Source: Certified Commercial Property Inspectors Association (CCPIA). PHW Inspections is a CCPIA member. Original article: https://ccpia.org/commercial-outbuilding-inspection-considerations/