ADU Rules in Lawrence, Massachusetts

Lawrence is an Essex County Gateway City with a population of about 80,000 on the Merrimack River, approximately 30 miles north of Boston near the New Hampshire border. One of the most diverse cities in Massachusetts with a large Dominican and Latino community, Lawrence has a rich history as a 19th-century textile mill city (site of the 1912 "Bread and Roses" strike). The city borders Methuen and Andover. Massachusetts enacted a statewide ADU law (Chapter 150, Acts of 2024) requiring ADUs by right in single-family zones.

Massachusetts Statewide ADU Law (2024)

Massachusetts Chapter 150, Acts of 2024 requires municipalities to allow ADUs by right in single-family residential zoning districts. Verify how Lawrence has implemented this law.

Lawrence Zoning Ordinance

The City of Lawrence Zoning Ordinance governs land use in Lawrence city limits.

Permitted ADU Types

Per Massachusetts ADU law and Lawrence zoning (verify current standards):

• Basement and interior conversions: Common in Lawrence's dense mill-era housing
• Attached ADUs: With separate entrance
• Detached ADUs: In eligible residential zones

Size Limits

Per Massachusetts ADU law:

• ADU cannot exceed smaller of: primary dwelling or 900 square feet

Setbacks

Per Lawrence residential zone:

• Rear: Minimum setback
• Side: Minimum setback

Merrimack River Flood Zones

The Merrimack River runs through Lawrence and has historically flooded. Parts of Lawrence near the river are in FEMA flood zones. Verify flood zone status for properties near the Merrimack. Lawrence has flood control infrastructure but some areas remain in flood zones.

Massachusetts Wetlands Protection Act

Properties within 100 feet of wetlands or 200 feet of the Merrimack River are subject to the Massachusetts Wetlands Protection Act. Lawrence Conservation Commission review required.

Historic Mill District

Lawrence has significant historic mill buildings. Properties in locally designated historic districts may require review.

Permit Process

1. Verify zoning and state ADU law: Lawrence Planning Division
2. Check flood zone: If near the Merrimack River
3. Conservation Commission review: If near wetlands or the Merrimack
4. Submit plans: Lawrence Building Division
5. Building permit and inspections
6. CO: Required before occupancy

Contact

City of Lawrence Planning Division 200 Common Street, Lawrence, MA 01840 Phone: (978) 794-5891 Website: cityoflawrence.com

Disclaimer: Massachusetts statewide ADU law (2024) applies. Merrimack River flood zones affect portions of Lawrence. Verify current standards before starting any project.