National Green Building Certification The NAHB Research Center accredits third-party verifiers and is the sole certifying body for the National Green Building Program. I am an accredited verifier for NAHB.

Contact them for more info:
NAHB Research Center
400 Prince George's Boulevard
Upper Marlboro, MD 20774
877-NAHB-GRN (877-624-2476)
Fax: 301-430-6180
www.nahbrc.com