Norwalk, CT Accessory Structures: ADU Rental Restrictions (2026)
Key Facts
- Minimum unit size
- 400 square feet
- Maximum unit size
- 700 square feet
- Principal dwelling floor
- Stays 800+ square feet
- Bedrooms allowed
- One bedroom maximum
- Occupancy cap
- 3 persons, max 2 adults
- Added parking
- 1 dedicated space for the unit
Summary
Norwalk caps every accessory apartment at 400 to 700 square feet, one bedroom, and three occupants with no more than two adults. Code § 118-420(C)(2) and (C)(3) also require the principal dwelling to stay at least 800 square feet and add a dedicated off-street parking space for the unit.
(2) The accessory apartment shall be a minimum of four hundred (400) square feet in area but not more than seven hundred (700) square feet in area. The area of the principal dwelling shall not be reduced to less than eight hundred (800) square feet. (3) An accessory apartment shall contain not more than one (1) bedroom, and occupancy shall be limited to three (3) persons, not more than two (2) of whom shall be adults. (4) Three (3) off-street parking spaces shall be provided: two (2) spaces per principal dwelling and one (1) space per accessory apartment. Such parking shall be adequately drained and suitably screened from adjacent residences.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4888624; v55 updated 2026-05-26; through 05-26-2026).
Full Breakdown
Norwalk's accessory apartment standards in § 118-420(C) restrict how large a unit can be built and who can live in it once the owner-occupancy and zoning tests in Subsection B are met. " Subsection C(3) limits both the layout and the household: an accessory apartment "shall contain not more than one (1) bedroom, and occupancy shall be limited to three (3) persons, not more than two (2) of whom shall be adults," which caps the unit at a one-bedroom rental for a small household rather than a full second family unit.
Subsection C(1) further restricts how the host house can grow to add the space, forbidding any change to "the single-family character of the dwelling," capping added lot coverage from the expansion at 150 square feet, and barring any new dormer from rising above the existing roof ridge or extending past the first-floor exterior wall. "
Violations & Fines
Enforcement runs through Norwalk Code § 118-1460: any owner, tenant, contractor or other person who commits or maintains a violation of the accessory apartment size or occupancy limits is "subject to permit revocation and/or penalties in accordance with the provisions of the Connecticut General Statutes." Noncompliance with a removal order within 10 days adds a civil penalty, and the Zoning Commission can revoke the permit outright after a public hearing if the violation is gross or repeated.
Frequently Asked Questions
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Sources & Official References
Other rules in Norwalk
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