Why are Accessory Dwelling Units so popular?

They go by many names: granny flats, in-law suits, secondary suits, etc. ADUs are self-contained living units on the same lot as a single family home. They often include a kitchen and bathroom. They can be basement apartments, detached cottages, or even garages.
Historically, early settlers would built a small home to live in while they constructed a larger, primary house. In the early 20th century, landowners would often built additional homes on their land for family or workers.
ADUs have become quite popular due to the housing shortages. They can provide additional income for homeowners. The are an economical housing option. They can represent the only affordable housing option in neighborhoods with only single family homes. They are great for the environment as they require fewer resources to build and maintain, as well as heat and cool. ADUs are able to house people of all ages, whether it is your child returning from college, or your aging mother. You could make it into your art studio or woodworking shop, or perhaps an office.
Texas is about to pass a bill that would end most restrictions on ADU construction. They would no longer be subject to municipal zoning restrictions.
In Seattle, there was a 250% increase in ADU construction in 2022 versus 2019.
Works Cited:
https://www.planning.org/knowledgebase/accessorydwellings/
https://www.aarp.org/livable-communities/housing/info-2019/accessory-dwelling-units-guide-download.html
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