A secondary suite is a self-contained living space within a larger residential property, often referred to as an accessory dwelling unit (ADU). It typically includes its own entrance, kitchen, bathroom, and sleeping area, allowing for independent living. Secondary suites can be found in basements, attics, or as separate structures on the same lot. These suites are popular for various reasons, including providing additional rental income for homeowners or housing family members. Many cities have specific regulations regarding the construction and use of secondary suites to ensure safety and compliance with zoning laws.