2021 International Residential Code for One- and Two-Family Dwellings – IRC-2021

The 2021 International Residential Code® (IRC) sets minimum requirements for one- and two-family dwellings and townhouses up to three stories. This official ICC model code consolidates building, mechanical, plumbing, energy, fuel gas, and electrical standards into one unified guide for home construction compliance.

Highlights:

• Covers structural, mechanical, plumbing, HVAC, energy, and electrical systems
• Offers both prescriptive rules and performance-based design flexibility
• Aligns with 2021 I-Codes® for integrated, multi-discipline compliance
• Includes updated energy provisions (NFPA 70, IECC) and appendices for solar, radon, and 3D-printed construction

Who It’s For:
Builders, code officials, engineers, and inspectors involved in residential code compliance, permitting, inspection preparation, or professional reference.

IRC-2021