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🏗️ Massachusetts Construction Code Cheat Sheet (2023–2025)
For Contractors & Clients
✅ 1. 10th Edition Building Code – Adopted 2023
- Based on 2021 International Building Codes (I-Codes)
- Replaces 9th Edition (based on 2015 I-Codes)
- Key Changes:
- Updated structural design standards (wind, snow loads, seismic zones)
- Stricter energy efficiency requirements (insulation, windows, envelope)
- Improved resiliency for flood- and storm-prone areas
🌱 2. New Stretch Energy Code & “Opt-In” Specialized Code
- Available for towns opting into net-zero goals
- What it means:
- All-electric readiness required in most new buildings
- Tighter blower door testing standards
- Increased insulation R-values and mechanical efficiency
- Applies to:
- New homes >4,000 sq ft
- Multi-family, commercial, mixed-use buildings
🔌 3. Electrification & Fossil Fuel Bans (Pilot Program)
- State-authorized 10-town pilot for fossil fuel bans
- Towns like Brookline, Cambridge, Newton may require:
- No gas/oil hookups in new construction
- Electric HVAC, hot water, cooking only
- Building must support heat pumps & electric appliances
🔥 4. Fire Code & Life Safety Enhancements
- Referencing updated NFPA 1 & 101
- What’s new:
- Sprinklers now required in more residential and mixed-use types
- Enhanced emergency egress signage & lighting
- Stricter fire alarm system upgrades for remodels and additions
⚡ 5. Electrical Code – 2023 NEC Updates (527 CMR 12.00)
- Aligns with 2023 National Electrical Code
- Contractor takeaways:
- EV charging readiness required in some garages/parking
- Arc fault protection required in more circuits
- Solar & battery systems need updated load calculations and disconnects
🛠️ Contractor Tips
- ✅ Review town-by-town variations (some adopt codes early or add local amendments)
- ✅ Plan early for energy modeling or HERS ratings in Stretch Code towns
- ✅ Pre-wire for future EV and solar when feasible—even if not yet required
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