Substitute Bill No. 5507 seeks to promote the development of accessory dwelling units (ADUs) in Connecticut by updating legal definitions and zoning regulations. The bill replaces the term "accessory apartment" with "accessory dwelling unit" and introduces the concept of "affordable accessory dwelling unit," which must be sold or rented at prices affordable for low-income families. It mandates that at least one ADU be allowed as of right on each lot with a single-family dwelling, and these units can be either attached to or detached from the principal dwelling. The bill also prohibits municipalities from imposing excessive restrictions on ADUs, such as requiring a familial relationship between occupants or mandating fire sprinklers unless required for the principal dwelling. Additionally, it establishes a maximum floor area for ADUs and ensures that municipalities cannot classify them as new residential uses for utility connection fees unless they are built with a new single-family dwelling.

Furthermore, the bill enhances municipal planning by requiring conservation and development plans to include elements that address housing opportunities, particularly for older adults and persons with disabilities. It mandates a climate change vulnerability assessment for plans adopted after October 1, 2027, to inform land use recommendations. The bill allows for home sharing among up to four adults with disabilities or those aged sixty and older in single-family zones and expands the definition of "family" to include these ADUs. It also modifies the affordable housing appeals procedure, stating it will not apply in municipalities with at least ten percent of dwelling units classified as assisted housing. The act is set to take effect on October 1, 2026, and includes various amendments to align existing statutes with these changes.

Statutes affected:
Raised Bill: 7-245
PD Joint Favorable Substitute: 7-245
File No. 258: 7-245
APP Joint Favorable: 7-245