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For customer service inquiries, please select a category above and submit your question using our contact form or contact us at the phone numbers or address below.

Phone and Fax

Within the US: 1-800-795-1746
Outside the US: +1-202-828-1145
Fax: 1-202-828-5110

Mailing Address

Green Building Certification Institute
2101 L Street NW, Suite 650
Washington DC 20037