What Is a WDO Inspection?
A WDO inspection is a visual inspection of a building for wood-destroying organisms, and a report of what the inspector found. If you are buying a home, refinancing, or selling, there is a good chance someone in the deal has asked for one. This guide explains what a WDO inspection is, what it covers, and what to expect.
What does WDO mean?
WDO stands for wood-destroying organisms. It covers the living things that damage the structural wood of a building: subterranean and drywood termites, wood-boring beetles, and fungus or dry rot. Some states run the same inspection under the name WDI, for wood-destroying insects. The point is the same — find evidence of these organisms and the damage they cause before it becomes someone's expensive surprise.
Who orders a WDO inspection, and why
Most WDO inspections happen during a real-estate transaction. Buyers want to know what they are buying. Mortgage lenders, especially on VA and FHA loans, frequently require a clear WDO report before they will fund. Escrow officers and real-estate agents coordinate the inspection so clearance is in hand before closing. Homeowners outside of a sale also order them as a routine check, since catching termites early is far cheaper than repairing years of hidden damage.
What the inspector checks
A licensed inspector walks the accessible areas of the structure — the substructure or crawl space, attic, garage, interior, and the exterior perimeter — looking for live activity, old damage, droppings or frass, mud tubes, and the moisture and construction conditions that invite infestation. Findings are recorded by location, with photos, and turned into a formal WDO inspection report that lists each finding and the recommended corrective work.
Section 1 vs Section 2 (California)
On a California WDO report the findings are split into two sections. Section 1 covers active infestations and visible damage — the conditions that must be corrected for the property to receive clearance. Section 2 covers conducive conditions: things like earth-to-wood contact, excessive moisture, or faulty grade that have not caused damage yet but could lead to it, and should be corrected to prevent future problems. Knowing which section a finding falls under tells you whether it is a must-fix for the deal or a recommended preventative measure. Our SPCB California WDO filing guide explains how California operators file these reports with the Structural Pest Control Board.
How long does it take?
For a typical single-family home, the on-site inspection usually takes under an hour. Larger homes, properties with limited access, or ones with extensive findings take longer. The written report is a separate step, and modern WDO report software lets the inspector generate it straight from the field data, so it can often be delivered the same day.
What does it cost?
There is no single set price. What a WDO inspection costs depends on the company, the size and type of the property, and the region. If you need one, contact a licensed pest control operator in your area for a quote.
Frequently asked questions
What is a WDO inspection?
A WDO inspection is a visual inspection of a building for wood-destroying organisms — termites, wood-boring beetles, and wood-decay fungus — and the conditions that attract them. A licensed inspector documents any evidence and the recommended corrective work in a WDO inspection report.
What does WDO mean?
WDO stands for wood-destroying organisms. In some states the same inspection is called a WDI (wood-destroying insect) inspection. It covers organisms that damage structural wood, most commonly subterranean and drywood termites, wood-boring beetles, and fungus or dry rot.
Who orders a WDO inspection?
Most WDO inspections are ordered during a real-estate transaction. Home buyers order one for peace of mind, mortgage lenders (especially VA and FHA loans) often require clearance, and escrow or the real-estate agent coordinates it before closing. Homeowners also order them for routine peace-of-mind checks.
What is the difference between Section 1 and Section 2 findings in California?
On a California WDO report, Section 1 lists active infestations or visible damage from wood-destroying organisms — the conditions that require correction for clearance. Section 2 lists conducive conditions that could lead to infestation, such as earth-to-wood contact, excessive moisture, or faulty grade, that should be corrected to prevent future problems.
How long does a WDO inspection take?
For a typical single-family home the on-site inspection usually takes under an hour, though larger or more complex properties, or ones with extensive findings, take longer. The written report is produced separately; software like Bug HQ generates it from the inspector’s field data so it can be delivered the same day.
How much does a WDO inspection cost?
The cost varies by company, property size, and region, so there is no single set price. Contact a licensed pest control operator in your area for a quote.