The CIMS-GB certification is awarded to companies that successfully demonstrate a commitment to the delivery of environmentally preferred services that meet partner needs and expectations. By implementing the CIMS-GB principles, HHS has established its capability of providing green cleaning services and assisting partners in achieving benchmarks and points under the LEED-Existing Buildings: Operations and Maintenance (LEED-EBOM) Green Building Rating System.
HHS underwent a comprehensive assessment by an accredited CIMS-GB assessor to officially be certified as an ISSA CIMS-GB with Honors organization.
The certification process includes a thorough review in six key areas: 
- Quality systems
- Service delivery
- Human resources
- Health, safety, and environmental stewardship
- Management commitment
- Green Building