ADU Rules in Lewes, Delaware

Lewes is Delaware's first city (incorporated 1683) and a premier beach and resort destination on the Delaware Bay. Located in Sussex County, Lewes has its own city government and zoning authority. Given its coastal location, flood zone compliance and Delaware Coastal Management Program requirements are important considerations.

Permitted ADU Types

• Detached ADU: Standalone structure on the residential lot
• Attached ADU: Addition with own entrance and kitchen
• Garage Conversion: Converting existing garage

Size Limits

Setbacks

Per Lewes zoning ordinance:

• Front: Per base zone standard
• Side: 5 feet minimum
• Rear: 10–15 feet minimum

Height

• Detached ADU: Maximum 15–18 feet
• Cannot exceed height of primary dwelling

Coastal and Flood Zone Considerations

Lewes has significant flood zone areas given its location on the Delaware Bay and Atlantic coast:

• Many properties are in FEMA Special Flood Hazard Areas (SFHA)
• Flood insurance and elevated foundation requirements may apply
• Delaware Coastal Management Program applies to properties in coastal zones
• Verify flood zone status at FEMA's Flood Map Service Center before planning

Historic District

Lewes has a historic district with older structures. Properties within the historic overlay may face additional design review requirements.

Short-Term Rentals

Lewes is a popular tourist destination. The city has regulations on short-term rentals (Airbnb, VRBO) that may affect ADU rental use. Confirm current short-term rental policies with the Planning Department.

Parking

One off-street parking space required per ADU.

Permit Process

1. Verify flood zone: Check FEMA flood map and coastal management requirements
2. Contact Lewes Planning: Verify current ADU standards
3. Historic review: If applicable
4. Submit plans: Site plan and architectural drawings
5. Building permit: Issued by City of Lewes
6. Inspections and CO: Required before occupancy

Contact

City of Lewes Planning and Inspections 114 East Third Street, Lewes, DE 19958 Phone: (302) 645-7777 Website: ci.lewes.de.us

Disclaimer: Verify current requirements with the City of Lewes, including flood zone status and coastal management requirements, before starting any project.