Eastham ADU Regulations
Current zoning bylaws, requirements, and permit process for Accessory Dwelling Units in Eastham, Massachusetts. Last updated: October 2025.
Please Note: This information is provided for general informational purposes only and should not be considered legal or professional advice. ADU regulations are subject to change, and individual circumstances may vary. We strongly recommend verifying all requirements, zoning bylaws, and permit procedures directly with the Town of Eastham Building Department or Planning Board before beginning any planning or construction activities. Town officials can provide the most current regulations and guidance specific to your property and project.
Bullet Point Summary
- Maximum Size: 1,200 sq ft or 50% of site coverage of principal dwelling, whichever is smaller
- Owner Occupancy Required: No (state law prohibits this)
- Number of ADUs Permitted: One ADU per single-family lot
- Attached vs. Detached: Both allowed by right
- Parking Requirements: Subject to state limits (max 1 space)
- Design Requirements: Must be clearly subordinate to primary home; property must continue to look like single-family lot; privacy of abutting properties must be maintained
- Septic/Title 5 Requirements: Must comply with Title 5 and Board of Health regulations
- Rental Restrictions: Max 2 bedrooms in ADU
- Special Incentives: None identified
- Application Process: Building permit through Building Commissioner
Additional Information
For the most up-to-date and complete regulations, please contact the Eastham Building Department or visit the town's official website to view ADU affidavit.
Our ADU specialists can help you navigate Eastham's specific requirements and design an ADU that meets all local regulations while maximizing your property's potential.