Passive House mandatory, strictest enforcement. Somerville is known for thorough plan review and strict enforcement. Projects should budget additional time for permit processing and plan revisions.
Somerville Building Code (780 CMR w/ Somerville amendments)
Edition: 2023 • Base: IBC 2021 + Net Zero Standards
Somerville High-Density Specialized Energy Requirements
Edition: 2023 • Base: Specialized Opt-in Code
Somerville has adopted the Specialized Opt-in Code. All-electric building systems required. HERS rating thresholds apply. Fossil fuel restrictions in effect.
Building permit (ISD), DPW street/utility permits, fire alarm/sprinkler permits, and potentially zoning relief. Major projects may require 8-12 separate permits with 4-8 week processing.
Somerville has extended review times. Residential: 3-6 weeks. Commercial: 6-12 weeks. Zoning relief adds 8-16 weeks.
Building permit fees based on project valuation (typically $15-25 per $1,000). Additional fees for DPW, fire, and specialty permits. Total permit costs: $500-$5,000+ for residential, $5,000-$50,000+ for commercial.
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