WDO Inspection FAQ

Wood-destroying organisms, or WDOs, can cause damage to wood and other cellulose-based materials in a home. Termites are among the most common WDOs, but other insects and organisms can also create structural concerns. A professional WDO inspection can help identify visible signs of activity, previous damage, and conditions that may increase the risk of future problems.

What does WDO stand for?

WDO stands for Wood-Destroying Organisms. The term generally refers to insects and organisms that can damage wood and other cellulose-based building materials.

Depending on the region and inspection requirements, WDO inspections may look for termites, wood-boring beetles, carpenter ants, carpenter bees, and wood-decay fungi.

What is a WDO inspection?

A WDO inspection is a visual examination of a property for evidence of wood-destroying organisms, previous damage, and conditions that may contribute to future activity.

An inspector typically examines accessible areas inside and outside the home, including foundations, siding, basements, crawl spaces, attics, structural wood, decks, porches, and other attached structures when included within the inspection scope.

The inspector documents visible findings and any areas that could not be fully evaluated because of obstructions or limited access.

Does a WDO inspection check for termites?

Yes. Termites are one of the primary organisms evaluated during a WDO inspection.

An inspector may look for signs such as termite shelter tubes, damaged or hollow-sounding wood, discarded wings, and other evidence of current or previous termite activity. The inspection may also identify moisture and construction conditions that can increase the risk of termite infestation.

What other organisms can a WDO inspection identify?

Depending on the inspection scope and region, a WDO inspection may identify evidence associated with:

• Subterranean termites
• Drywood termites
• Dampwood termites
• Powderpost beetles and other wood-boring beetles
• Carpenter ants
• Carpenter bees
• Wood-decay fungi

Not every organism is present in every geographic area, and the specific scope of an inspection can vary.

What are common signs of termites?

Common signs that may indicate termite activity include:

• Mud or shelter tubes along foundations, walls, piers, or other surfaces
• Discarded wings near windows, doors, or other areas
• Damaged or hollow-sounding wood
• Wood that appears soft or weakened
• Doors or windows that become difficult to open or close
• Small openings or damaged areas in wood
• Evidence of previous termite treatment

Some termite activity can remain concealed, so the absence of obvious signs does not necessarily mean a property has no termite concerns.

What does a WDO inspection look for?

A WDO inspection generally focuses on three areas:

Active activity: Evidence that termites or another wood-destroying organism may currently be present.

Previous damage or activity: Visible damage or other evidence suggesting that WDO activity occurred in the past.

Conducive conditions: Moisture, wood-to-soil contact, poor drainage, leaks, inadequate ventilation, or other conditions that may make a property more susceptible to WDO problems.

What areas of a home are inspected for WDOs?

An inspector typically evaluates accessible areas of the interior and exterior of a property.

Exterior areas may include:

• Foundation walls
• Siding and trim
• Eaves
• Decks and porches
• Steps
• Attached fences
• Areas around utility and plumbing penetrations

Interior areas may include:

• Baseboards
• Window sills
• Door frames
• Cabinets
• Accessible framing
• Basements
• Crawl spaces
• Attics

Structural components such as sill plates, floor joists, beams, support posts, rafters, trusses, and sheathing may also be evaluated when accessible.

How should I prepare for a WDO inspection?

The most helpful preparation is to provide the inspector with access to areas that need to be evaluated.

Before the inspection:

• Move stored items away from walls and baseboards where possible.
• Clear access to attic hatches and crawl spaces.
• Unlock basements, crawl spaces, mechanical rooms, garages, and other areas included in the inspection.
• Remove unnecessary debris around foundations, decks, and porches.
• Make sure gates provide access to exterior areas.
• Gather previous WDO reports, termite treatment records, and warranty documents.

You can also address known moisture problems, such as active plumbing leaks or drainage issues, before the inspection when practical.

How long does a WDO inspection take?

The length of an inspection depends on factors such as the size and layout of the property, the inspection scope, and how easily accessible the areas of the home are.

A larger property or one with limited access may require additional time to evaluate.

What happens if a WDO is found?

If an inspection identifies evidence of active WDO activity or previous damage, the report will document the findings and may identify recommended next steps.

Depending on the situation, those steps may include:

• Professional pest treatment
• Repairs or replacement of damaged wood
• Correcting plumbing, roof, or drainage problems
• Improving crawl-space ventilation or moisture control
• Additional evaluation of areas that could not be fully inspected

Treatment and structural repairs are separate services and may require qualified pest-control professionals or contractors.

What is included in a WDO inspection report?

A WDO report typically documents the property information, inspection date, areas inspected, findings, limitations, and relevant conditions identified during the inspection.

Depending on the report format and inspection requirements, it may include:

• Property and structure information
• Inspection scope
• Areas that were inaccessible
• Evidence of active infestation
• Evidence of previous WDO activity or damage
• Conditions conducive to WDO activity
• Recommended actions
• Photos or diagrams when provided

For real estate transactions, the report may also be used by buyers, sellers, real estate professionals, lenders, or other parties involved in the transaction.

Is a WDO inspection the same as a home inspection?

No. A home inspection and a WDO inspection have different purposes.

A general home inspection evaluates the overall condition of major components and systems of a property. A WDO inspection focuses specifically on evidence of wood-destroying organisms, related damage, and conditions that may contribute to WDO activity.

Depending on the circumstances, both inspections may be appropriate when purchasing a home.

Is a WDO inspection required when buying a home?

Requirements vary depending on the property, transaction, lender, location, and other circumstances. Buyers should check with their lender and real estate professionals to determine whether a WDO inspection or report is required for their transaction.

A WDO inspection can also provide useful information about potential wood-destroying organism concerns even when it is not specifically required.

How often should a home have a WDO inspection?

The appropriate inspection frequency depends on factors such as the property’s location, age, construction, moisture conditions, history of WDO activity, and whether the property has an existing termite protection or monitoring plan.

Homeowners with previous termite or WDO concerns may benefit from routine professional monitoring and inspections.

Can a WDO inspection find hidden termite damage?

A WDO inspection can identify visible evidence and accessible signs of termite activity or damage, but inspectors generally cannot see through finished walls, floors, insulation, or other concealed areas.

If an area cannot be accessed or evaluated, that limitation should be documented in the inspection report. Additional evaluation may be appropriate when there are signs of a problem in a concealed area.

How can homeowners prevent WDO problems?

Homeowners can reduce conditions that attract or encourage WDO activity by:

• Repairing roof and plumbing leaks promptly
• Keeping gutters and downspouts functioning properly
• Directing drainage away from the foundation
• Reducing standing water around the property
• Avoiding wood-to-soil contact
• Keeping firewood and lumber away from the home and off the ground
• Maintaining appropriate crawl-space moisture and ventilation conditions
• Keeping excessive mulch away from the foundation
• Trimming vegetation that contacts the structure
• Watching for signs such as mud tubes, discarded wings, frass, or damaged wood

Regular professional inspections can also help identify developing concerns before they become more extensive.