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 home inspector certification requirements.
  3. Complete InterNACHI's free, online Wood-Destroying Organism Inspection Course

Certified inspectors 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).

Work on branding and marketing. 


Everything You Need, All in One Place


Learn how to run a successful business.


Log into your members-only account.


Enjoy your membership benefits.

InterNACHI provides members over $75,000 worth of membership benefits.

Not a member?