New 2025 “By-Right” Building Laws
An ADU, or Accessory Dwelling Unit, is a secondary housing unit located on the same property as a primary residence.
What the 2025 Massachusetts ADU Update Means for You: Under the newly enacted Affordable Homes Act, building an ADU is now a “By-Right” use in single-family residential zones across Massachusetts. This means:
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No Special Permits Required: In most cases, you no longer need a special permit or public hearing to add an ADU to your property.
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Expanded Size Limits: You can now build up to 900 square feet (or half the size of your primary home, whichever is smaller) by-right.
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Simplified Approval: The process is streamlined, allowing you to move from design to construction faster.
Why Choose Bayside Build & Remodel for Your ADU? While the new state laws simplify zoning, building on Cape Cod still requires navigating unique local challenges. As premier custom home builders on Cape Cod, Bayside Build & Remodel provides a seamless “Conception to Completion” experience.
We specialize in the critical details that the “By-Right” law doesn’t cover, including:
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Septic & Title 5 Compliance: We ensure your property’s septic capacity can handle the new unit.
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Conservation & Board of Health: We manage the approvals for properties near wetlands or in protected coastal areas.
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Custom Design & Engineering: Our team creates ADUs that match the aesthetic of your existing home while maximizing every square inch of the new 900 sq. ft. limit.
From site work and excavation to custom trim and high-efficiency Andersen windows, we handle every detail. Let us help you take advantage of the new Massachusetts legislation to increase your property value and create the extra space you need.