ADU Zoning in Westport, Connecticut
What Westport allows for accessory dwelling units — permitted zones, size limits, parking, rental rules and utilities. Boxx ADUs designs and builds ADUs in Westport and across Fairfield County. Call us to talk through your property, or send us a message.
Which zones allow ADUs?
All single-family residential zones provided the lot meets the minimum size requirement for that specific zone.
What types of ADUs are allowed?
Attached or Detached ADUs.
What are the size/floor area requirements?
Detached Units: For lots 1.5 acres or smaller, the maximum footprint is 650 square feet, with 350 square feet not counted toward coverage. For lots larger than 1.5 acres, the maximum footprint is 1,000 square feet, with no deductions.
Attached Units: The accessory apartment’s floor area cannot exceed 1,500 square feet or 25% of your primary home’s total square footage, whichever is smaller. The allowed floor area is based on the size of your primary residence and property.
How many parking spaces?
Westport requires one parking space for the ADU. If you plan to add an ADU to a Westport property, plan to accommodate three parking spaces within the boundary of your property.
What are the rental requirements?
Owner-occupancy is required and only long-term rentals are permitted.
What about utilities, sewer or septic?
Utilities and sewer tie into the main house. Septic is job-specific.
Summarized for convenience and current as of publication. Local regulations change — confirm details with the town before relying on them.