Mass Residential Code – 10th Ed

The Mass Residential Code – 10th Ed is the latest update to the state’s residential construction regulations, incorporating the 2021 International Residential Code (IRC) with Massachusetts-specific amendments under the broader 780 CMR 10th Edition framework. Designed to regulate the design, construction, alteration, and maintenance of one- and two-family dwellings and townhouses, the code reflects current best practices and safety standards tailored to Massachusetts’ unique climate, geography, and legal environment. This edition introduces significant updates, including enhanced structural requirements for snow and wind loads, improved energy efficiency standards, and new allowances for emerging building types like tiny homes. It also supports state environmental goals through integration with Stretch and Specialized Stretch energy codes. The code is written for contractors, architects, building officials, and inspectors, offering clear guidance on everything from foundations and framing to mechanical, plumbing, and fire safety systems. With full enforcement beginning July 1, 2025, the 10th Edition ensures that all residential construction in the state adheres to modern, sustainable, and code-compliant building practices.

Key aspects:

• Covers one- and two-family dwellings and townhouses
  • Applicable to detached and attached residential structures up to three stories.
• Updated structural design requirements
  • Includes revised wind and snow load criteria suited to Massachusetts’ climate zones.
• Enhanced energy efficiency standards
  • Aligns with Massachusetts’ Base Energy Code and supports optional Stretch and Specialized Stretch Codes.
• Fire safety and egress improvements
  • Updates include clearer provisions for fire resistance, smoke alarms, and emergency escape access.
• Revised foundation and framing requirements
  • Modernized standards for footings, wall bracing, and structural spans.
• New provisions for tiny homes and modern housing types
  • Recognizes evolving residential trends and alternative construction approaches.
• Stronger code enforcement timeline
  • Mandatory use of the 10th Edition begins July 1, 2025 (following a concurrency period).

Highlights:

• Based on the 2021 International Residential Code (IRC)
  • Adopted with Massachusetts-specific amendments for local conditions and laws
• Integrated into the full 780 CMR State Building Code
  • Part of a comprehensive regulatory structure that includes building, energy, mechanical, and plumbing codes.
• Designed for use by builders, inspectors, architects, and code officials
  • Provides clear language and structure for consistent application across the state.

About BBRS

The Board of Building Regulations and Standards (BBRS) is a regulatory body within the Massachusetts Department of Public Safety responsible for developing, adopting, and maintaining the state’s building codes and regulations. Established to ensure public safety and promote consistent construction standards, the BBRS oversees codes including the Massachusetts State Building Code (780 CMR), which covers residential, commercial, and industrial construction. The board comprises industry professionals such as architects, engineers, contractors, and fire officials who collaborate to tailor national model codes like the International Residential Code (IRC) to meet Massachusetts’ unique climate, legal, and safety needs. Through public hearings and expert review, the BBRS continuously updates regulations to reflect advancements in building technology, energy efficiency, and life safety.

Other Works:

• Massachusetts State Building Code Basic/Commercial Version – 10th Edition
• 2021 International Residential Code