NFRC Inspection Agency Services for Fenestration
Meet building code requirements and qualify for ENERGY STAR with NFRC-licensed Inspection Agency (IA) services. Keystone provides third-party verification of window and door energy performance ratings required by IRC, IECC, and IBC building codes nationwide.
NFRC Licensed Inspection Agency — Trusted nationwide for code compliance and market access
Why NFRC Certification Is Essential
Required by Building Codes
NFRC thermal performance ratings are specified by the International Residential Code (IRC), International Energy Conservation Code (IECC), and International Building Code (IBC). Required for code compliance in most jurisdictions.
Qualify for ENERGY STAR
NFRC ratings are required to demonstrate compliance with the US EPA's ENERGY STAR® Windows Program, opening doors to residential and commercial markets.
Access Incentive Programs
Enable your customers to qualify for utility rebates, federal tax incentives, and state energy conservation programs with verified performance data.
Third-Party Credibility
Provide architects, builders, and homeowners with independently verified thermal performance data from a nationally-recognized certification body.
Energy Performance Ratings Certified
Our NFRC IA services provide third-party verification of key energy performance characteristics:
- U-Factor — Heat transfer/insulation
- SHGC — Solar Heat Gain Coefficient
- VT — Visible Transmittance
- Air Leakage — Infiltration rates
- CR — Condensation Resistance
Products Covered: Residential and commercial windows, doors, and skylights
How NFRC Certification Works
Product Testing
Products are tested or simulated using NFRC-approved methods at accredited laboratories.
IA Verification
Keystone, as the licensed IA, reviews and validates all test data and product configurations.
Label Authorization
Products receive NFRC labels with certified ratings for use in the marketplace.
CPD Listing
Products are listed in the public NFRC Certified Products Directory for verification.
NFRC Certified Products Directory (CPD)
All NFRC certified products are listed in the public NFRC Certified Products Directory at www.nfrc.org. The CPD allows architects, code officials, contractors, and homeowners to verify product ratings and options.
Access the NFRC CPD Codes listing and abbreviated IGDB containing emissivities for the most prevalent low-e coatings in North America.
Ready to Get Started with NFRC?
Review the NFRC Getting Started Checklist guide for fenestration manufacturers looking for detailed guidance on certifying thermal performance.
For personalized guidance on your specific products, use the contact form or call our certification experts.
Meeting National Building Code Requirements
International Residential Code (IRC) — Requires NFRC ratings for residential fenestration products
International Energy Conservation Code (IECC) — Specifies NFRC U-Factor and SHGC requirements by climate zone
International Building Code (IBC) — References NFRC ratings for commercial building energy compliance
Why Choose Keystone as Your NFRC IA?
NFRC Licensed Inspection Agency — Authorized to verify and certify fenestration energy performance
Comprehensive expertise — Supporting manufacturers with testing, labeling, and ongoing compliance
Responsive service — Dedicated support team to guide you through the certification process
Start Your NFRC Certification
Contact our NFRC experts to discuss your fenestration energy performance certification needs.
NFRC Resources & Standards
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