Certifications & Contracting Credentials 

NAICS Codes

Management & Administrative Services

• 541611 – Administrative Management and General Management Consulting Services

• 541618 – Other Management Consulting Services

• 561110 – Office Administrative Services

• 541620 – Environmental Consulting Services

Construction & Building

• 236118 – Residential Remodelers

• 236220 – Commercial and Institutional Building Construction

• 237110 – Water and Sewer Line and Related Structures Construction

Specialty Trade Contractors

• 238210 – Electrical Contractors and Other Wiring Installation Contractors

• 238220 – Plumbing, Heating, and Air-Conditioning Contractors

• 238310 – Drywall and Insulation Contractors

• 238320 – Painting and Wall Covering Contractors

• 238330 – Flooring Contractors

• 238990 – All Other Specialty Trade Contractors

Environmental & Remediation

• 562910 – Remediation Services