Become a Certified Wood-Destroying Organism (WDO) Inspector

This online certification program is provided by InterNACHI® School ( for free to InterNACHI® members. To become a certified WDO inspector: 

  1. Join InterNACHI® as a member.
  2. Complete InterNACHI's free, online Wood-Destroying Organism Inspection Course
  3. Abide by the InterNACHI® Continuing Education Policy for InterNACHI® Certified Inspectors.

Only InterNACHI® Certified Inspectors are permitted to download and use InterNACHI's certification logos.

WDO Inspection Resources

InterNACHI® provides WDO Inspection Resources for certified inspectors a Wood-Destroying Organism (WDO) checklist report, an online training course, and an inspection field guide. 

More Inspector Certifications

Members have unlimited access to all of InterNACHI's free, online courses. Learn at your own pace, and when you're ready, you can attain more than 60 additional types of inspector certifications (at no additional cost).

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