ADU Rules in Westbrook, Maine

Westbrook is a Cumberland County city of about 19,000 on the Presumpscot River, approximately 5 miles west of downtown Portland. Part of the Greater Portland metropolitan area, Westbrook is a Portland suburb that has seen significant growth and development, particularly around its former mill sites along the Presumpscot River. Westbrook is an entirely separate city from Portland with its own government and zoning code. Maine has no statewide ADU preemption law — Westbrook's local zoning governs.

Westbrook vs. Portland

• Westbrook: Separate city west of Portland — use Westbrook's permit process
• Portland: Separate city to the east — different Land Use Code, different permits
• Portland permits are not valid in Westbrook

Westbrook Zoning Ordinance

The City of Westbrook Zoning Ordinance governs all land use within Westbrook city limits.

Permitted ADU Types

Depending on the zoning district:

• Accessory apartments: Within or attached to primary structure
• Detached accessory dwelling units: Subject to zoning standards

Verify current ADU provisions with Westbrook's Planning and Code Enforcement Division.

Size Limits

Accessory dwelling units are subject to:

• Maximum floor area per zone
• Lot coverage restrictions

Setbacks

Per Westbrook residential zone (typical):

• Rear: Minimum setback
• Side: Minimum setback

Maine Shoreland Zoning

Properties within 250 feet of the Presumpscot River, Stroudwater River, or other water bodies are subject to Maine's Shoreland Zoning Act (Title 38). The Presumpscot River runs through Westbrook — verify shoreland zoning for riverfront properties.

Presumpscot River Flood Zones

Parts of Westbrook near the Presumpscot River may be in FEMA flood zones. Verify flood map status for riverfront properties.

Permit Process

1. Verify jurisdiction: Confirm your property is in Westbrook (not Portland or Gorham)
2. Verify zoning: Westbrook Planning and Code Enforcement Division
3. Check shoreland zoning: If near the Presumpscot River
4. Check flood zone status: If near the river
5. Submit plans: Westbrook Code Enforcement
6. Building permit and inspections
7. CO: Required before occupancy

Contact

City of Westbrook Planning and Code Enforcement Division 2 York Street, Westbrook, ME 04092 Phone: (207) 854-0638 Website: westbrookmaine.com

Disclaimer: Maine has no statewide ADU law. Westbrook and Portland are separate cities. Maine Shoreland Zoning applies near the Presumpscot River. Verify current ADU allowances with the City of Westbrook before starting any project.