The accessory dwelling unit, or ADU, is a popular and affordable housing choice that adds livable space to your property. It’s becoming an increasingly common option as cities across the nation become more expensive, populated, and urbanized. They allow for increased room, without the price-tag of purchasing a brand new home. ADUs come in a plethora of options, allowing you to tailor them to your specific needs. ADUs can potentially create you an extra source of rental income, increase property value, or serve as a guesthouse.