Why Select an Accredited Company?

Companies who achieve Natural Stone Institute Accreditation have proven themselves best-in-class for fabrication and installation methods in their respective disciplines. Accreditations are available for Natural Stone Fabricator, Commercial A, and Commercial B installer.

Find an Accredited Company      Sample Specification Language


Reduce Liability • Increase Quality • Use Qualified Labor

The standards below have been verified through a multi-step process which includes a thorough document review, written exam, and extensive on-site inspection.


Customer Service

Reputation for honest and timely communication with customers, employees, subcontractors, and suppliers

Quality Control

Fabrication and installation meet the highest levels of quality and safety

Technical Knowledge

Expertise in installation and fabrication verified through written exam and on-site inspection


Physical Facilities

Ample facilities, equipment, and materials to perform high-quality workmanship of natural stone countertops

Business Practices

Demonstrate sound business performance and trade practices


Follow the latest workplace safety regulations set by OSHA and other governing authorities



Have proven credibility by accurately representing the company’s expertise, experience, credentials, and services

Financial Resources

Demonstrates financial stability sufficient to conduct stated business in a safe and effective manner 

Human Resources

Have competent human resources for staff training and ongoing development  


Similar Qualified Labor Programs




Use Natural Stone

Genuine. Versatile. Unique. Durable. Sustainable. Easy to Maintain.