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

Scope:
The 2021 IRC® sets minimum requirements for the design, construction, and alteration of one- and two-family dwellings and townhouses up to three stories. It covers every aspect of residential building systems, including structural, mechanical, plumbing, fuel gas, energy, and electrical provisions. Developed by the International Code Council, this edition is harmonized with the complete family of 2021 I-Codes®, supporting jurisdictions that adopt a comprehensive and coordinated building code framework.

Key Features and Content Highlights:

• Comprehensive Coverage for Residential Projects:
  Addresses all components of residential buildings—structural framing, foundations, roofing, energy efficiency, plumbing, HVAC, and electrical systems—providing a single, cohesive source of compliance guidance.
• Prescriptive and Performance-Based Provisions:
  Combines practical prescriptive requirements with performance alternatives to accommodate both conventional methods and innovative technologies in residential design and construction.
• Energy and Sustainability Provisions:
  Includes updated energy efficiency criteria (aligned with the 2020 NFPA 70), thermal envelope standards, and conservation measures tailored to modern residential demands and climate zones.
• Code Integration and Compatibility:
  Fully compatible with other 2021 I-Codes® (e.g., IBC, IECC, IPC, IFGC), allowing seamless coordination across various construction disciplines and regulatory systems.
• Administrative and Enforcement Tools:
  Outlines responsibilities for code officials, permitting procedures, inspections, occupancy certification, and enforcement mechanisms, including customization options for local jurisdictions.
• Referenced Standards and Appendices:
  Backed by updated referenced standards and detailed appendices—ranging from radon control to solar-ready provisions and 3D-printed construction—enabling code officials and builders to address a wide range of residential innovations and hazards.

The IRC is a critical resource for architects, engineers, code officials, and contractors engaged in the residential sector, offering both flexibility and rigor in ensuring safety, efficiency, and structural integrity in homes.