Westport has established clear ADU guidelines that, while having specific requirements, provide a pathway for homeowners to build on their existing property. Whether you're considering a primary residence for a family member, a rental income source, or an independent square footage for your growing family, understanding the local zoning rules is essential to moving forward with confidence. We've reviewed Westport's zoning regulations in detail and outlined the key requirements below. Rules can change, so confirm details with the Westport Planning Department or book a free consultation with our team before starting your project.
Where Are ADUs Allowed
ADUs in Westport are permitted on single-family residential properties. ADUs are permitted on single-family residential properties that meet current zoning district requirements.Each property is limited to one ADU. Key neighborhoods where ADUs are often approved include Compo, Saugatuck.
Types of ADUs Allowed
Attached (an addition to your existing home that shares a wall, maintaining architectural cohesion with the main structure). Detached (a standalone structure in your backyard, ideal for rental income, multigenerational living, or maximum privacy). Converted (repurposing an existing garage, basement, or accessory structure, often the most expedient option since the shell already exists).
Size Limits
ADU size must comply with Westport's local zoning requirements. Contact the Westport Planning Department for specific square footage limits.
Parking
Off-street parking requirements apply to ADUs.
Owner Occupancy
Owner occupancy is required. The property owner must continuously occupy either the main home or the ADU as their primary residence.
Rental Use
Long-term rentals are generally permitted. Short-term rental restrictions may apply, so check local regulations if you're considering Airbnb or VRBO-style leasing.
How to Build an ADU in Westport
Schedule a free consultation with Haven to confirm your eligibility and walk through your options
Work with a Haven designer to develop your custom ADU project that meets Westport's local regulations
Haven handles all communication with the municipality and submits your permit application
During construction, the Haven team visits the site regularly to ensure what is being built meets our standards
Certificate of occupancy is issued after the final inspection, allowing the unit to be legally occupied
Permit approval in Westport typically takes 4 to 8 weeks on average in Connecticut.
Frequently Asked Questions
Q: Can I build a detached ADU in Westport, and if so, how tall can it be?
Yes, detached ADUs are permitted in AAA, AA, and R-3 zones. Maximum height is 16 feet to the peak if the roof pitch is 6:12 or lower, or 26 feet to the peak if the roof pitch exceeds 6:12.
Q: What are the occupancy limits for an ADU in Westport?
Standard ADUs are limited to a maximum of 2 occupants, or 3 people if the ADU is designated as affordable housing. The owner must reside in either the principal dwelling or the ADU.
Q: What is the minimum rental term allowed for an ADU in Westport?
The shortest term that an ADU can be rented for is 6 months, which restricts short-term vacation rentals or Airbnb-style arrangements.
Your property must be a single-family residential lot with appropriate zoning designation to be eligible for an ADU in Westport. At Haven, we handle the entire ADU process for Westport homeowners, from zoning verification and design through permitting and construction. Book a free consultation to find out if your property qualifies.