The definition of a secondary unit or Accessory Dwelling Unit (ADU) is an independent residential dwelling situated on the same lot as a primary single-family home.
These residences are often known by different names—Garden House, Laneway House, Carriage House, or Tiny House. Regardless of the term used, each provides a complete living space, including a private kitchen, bathroom, and sleeping quarters. Beyond their functionality, ADUs offer significant benefits: they expand housing supply, provide flexible accommodations for family or tenants, and ensure a more efficient use of land.
ADUs can be newly built using bespoke architectural plans or created through the thoughtful conversion of an existing structure such as a garage, shed, or workshop. Many design firms now offer beautifully crafted layouts and construction solutions that blend seamlessly with existing estates.
One of my particularly memorable projects was the Carriage House at a previous property, originally built in the 1960s as a two-storey garage. When the main residence underwent a complete renovation in 2022, the garage was reimagined into an elegant ADU. Every one of my details of the interior echoed the main home: custom vanities, a chef’s kitchen, quartz countertops, fine flooring, and hardware selected with equal precision. We even replicated the oak staircases and bannisters to match, creating a perfect architectural “miniature” of the principal residence. While the grounds were shared, the Carriage House featured its own private garden retreat, offering autonomy within connection.
For families, ADUs provide an ideal balance: loved ones can enjoy independence while remaining only steps away. They are particularly well-suited for multi-generational living, offering proximity with privacy—apart, yet together. For younger buyers, an ADU presents an accessible entry point into homeownership, while for established homeowners, it can represent a thoughtful investment in both property value and family legacy.
The rise of ADUs is not only a lifestyle solution but also a strategic response to today’s housing market. With many municipalities now approving and even incentivizing ADU development, the opportunity to create a sophisticated secondary residence has never been greater. Regulations vary by city, so it is essential to consult local planning departments regarding permits and requirements.
For more information, the City of Burlington provides an excellent resource at getinvolvedburlington.ca.