Accreditation Resources for Design Professionals
Specifying Accredited Contractors for your stonework reduces liability and ensures a quality installation.
The Accreditation Program raises the bar for quality in the stone industry and provides specifiers, contractors, and building owners with an easy to find collection of well-qualified stone professionals. It is the only independent third-party credentialing program for natural stone fabricators and installers; accrediting companies, not individuals.
Accredited companies are reviewed to ensure compliance with a rigorous set of metrics.
- Quality Control
- Safety
- Physical Facilities and Equipment
- Business and Trade Practices
- Technical Knowledge and Expertise
- Customer Service
- Ethics
- Finance
- Employment Practices and Training
There are three types of Natural Stone Institute Accreditation:
- Accredited Commercial A Contractors specialize in heavy commercial projects including large-scale engineered high-rise cladding.
- Accredited Commercial B Contractors specialize in general commercial projects including low rise cladding and interiors. Commercial A Contractors are also qualified for this work.
- Accredited Fabricators specialize in countertops and other non-engineered residential or commercial interiors.
Similar Qualified Labor Programs:
- Advanced Certification for Tile Installers (ACT)
- Five Star Tile Contractors (NTCA)
- Certified Wood Flooring Professionals (NWFA)
- Certified Tile Installer (CTEF)
- Certified Masonry Contractors (MCAA)
- Certified Quality Woodwork (AWI)
- Tile Contractors’ Trowel of Excellence (TCAA)
