Rockport

• Rockport has voted to allow ADUs by right in all zoned areas, aligning with the state Affordable Homes Act.
• The key local change was eliminating the prior requirement that a lot must be large enough for two dwelling units before an ADU could be built -- critical for Rockport's many small and nonconforming lots.
• Standard state rules apply: maximum 900 sq ft or 50% of the principal dwelling, whichever is smaller.
• No owner-occupancy requirement (preempted by state law). No family-member restrictions.
• As a coastal community with historic character, environmental and design considerations may apply on a per-lot basis.

1. Prepare application: Standard building permit application with plans demonstrating compliance with zoning requirements and state building code.
2. Submit to Building Department: ADUs are by right -- no special permit or public hearing required.
3. Demonstrate compliance: Must comply with applicable building codes (780 CMR), zoning dimensional requirements, and any environmental regulations.
4. Historic considerations: If the property is in a historic area, additional design review may apply (verify with Building Department).
5. Environmental review: Properties near the coast or wetlands may require Conservation Commission review.

• Maximum size: 900 sq ft or 50% of the principal dwelling's gross floor area, whichever is smaller.
• Separate entrance: Required, either directly from the outside or through a shared entry hall/corridor meeting building code egress requirements.
• Self-contained: Must include sleeping, cooking, and sanitary facilities.
• Types: Attached, detached, or internal ADUs are all permitted under state law.
• Building code: Must comply with 780 CMR (Massachusetts State Building Code).
• Lot size: No minimum lot size requirement specific to ADUs. The previous requirement that the lot be sufficient for two dwelling units has been eliminated.

• Parking: Maximum of 1 off-street parking space may be required.
• Transit exemption: No additional parking may be required for ADUs within 0.5 miles of a commuter rail station, subway station, ferry terminal, or bus station (per state law).
• Rockport is served by the MBTA Rockport commuter rail line; properties near the station may qualify for the transit exemption.

• Small/nonconforming lots: Rockport has many small and nonconforming lots. The elimination of the two-dwelling-unit lot size requirement is the most significant local change, opening ADU construction to a much larger number of properties.
• Coastal community: Environmental restrictions related to the coastline, flood zones, and wetlands may affect ADU construction on specific lots. Conservation Commission approval may be needed.
• Historic character: Rockport has significant historic character. While specific historic district review requirements were not detailed in the available source, design considerations may apply. Contact the Building Department for current requirements.
• Water/sewer capacity: Infrastructure capacity may be a constraint in some areas of town.
• Simple majority: The zoning changes needed only a simple majority at Town Meeting (due to being housing-increasing provisions under state law).

Source: Rockport ADU Zoning Summary (Compiled from news sources and town website)

Overview:

The Rockport Planning Board proposed zoning changes to allow ADUs to be permitted by right in all zoned areas in town. The key change eliminates the previous ADU building requirement that the lot area be sufficient for two dwelling units -- this was a major barrier since Rockport has many small lots.

Adopted Changes (Fall 2025 Town Meeting, September 8, 2025 — AG approved):

1. ADUs permitted by right in ALL zoned areas (not just select residential districts)
2. ELIMINATED requirement that lot must be large enough for two dwelling units
3. Aligns with state Affordable Homes Act requirements
4. Needed only simple majority at Town Meeting (due to housing-increasing provisions)
5. Short-term rentals prohibited — minimum 30 consecutive day rental period
6. Design requirements to match the look and feel of the principal home

State Law Requirements (Apply to Rockport):

• One ADU per single-family lot, allowed by right
• Maximum 900 sq ft or 50% of principal dwelling, whichever is smaller
• No special permit required
• No owner-occupancy requirement
• No family-member restrictions
• Maximum 1 parking space (0 if within 0.5 miles of transit)
• Separate entrance required
• Must comply with building codes

Local Considerations:

• Many Rockport lots are small/nonconforming -- the elimination of the two-dwelling-unit lot size requirement is critical for enabling ADU construction
• Historic district considerations may affect design standards
• Rockport is a coastal community with potential environmental restrictions
• Water/sewer capacity may be a constraint in some areas

Zoning Bylaws:

Town of Rockport Zoning By-Laws (2023 version available on town website). Updated version may be available following Town Meeting action.

Note: Full bylaw text was not available in the source material. The above is compiled from news sources and the town website. Contact the Town Clerk or Building Department for the current adopted bylaw language.

Rockport has adopted the Stretch Energy Code. A certified HERS Rater is required for all new construction, including ADUs.

Your ADU must achieve a HERS index of 52 or lower (mixed-fuel) or 55 or lower (all-electric). Going all-electric earns a 3-point offset, making compliance easier. Budget $500–$1,500 for HERS testing.

ERV/HRV mechanical ventilation is now required (bath fans alone don't qualify). If on-site parking is provided, EV-ready wiring is also required.

The following provisions are preempted by the Massachusetts Affordable Homes Act (Chapter 150 of the Acts of 2024) and 760 CMR 71.00:

• Owner occupancy: State law prohibits municipalities from imposing owner-occupancy requirements for either the ADU or the principal dwelling.
• Special permit: State law mandates by-right approval for the first ADU on a single-family lot. No special permit or public hearing is required.
• Lot size minimums: State law prohibits minimum lot size requirements specific to ADUs. Rockport's elimination of the two-dwelling-unit lot requirement aligns with this.
• Family member restrictions: State law prohibits restricting ADU occupancy to family members.
• Unit caps and density limits: State law prohibits ADU-specific unit caps and density limitations.

• North Shore Realtors — Rockport zoning changes: https://www.northshorerealtors.com/news/rockport-to-consider-3-zoning-changes
• North Shore Realtors — AG approval: https://www.northshorerealtors.com/news/ag-office-rockport-zoning-changes-legal
• Town of Rockport Planning Board: https://www.rockportma.gov/309/Planning-Board
• Town of Rockport Zoning By-Laws (2023): https://www.rockportma.gov/DocumentCenter/View/2101/Town-of-Rockport-Zoning-ByLaws
• Town of Rockport website: https://www.rockportma.gov
• Massachusetts Affordable Homes Act (H.4977 / St. 2024, c. 150)
• 760 CMR 71.00 (Protected Use Accessory Dwelling Units)