An accessory dwelling unit (ADU) project in Phoenix requires careful consideration and a thorough understanding of local and state regulations. Our ADU planning resources page shares information to guide your thinking with resources on eligibility and size. Discover how you can efficiently add functional, valuable living space to your property with expert advice and comprehensive resources.
Whether you call it a casita or an in-law apartment, the City of Phoenix defines an ADU as a subordinate or secondary dwelling situated on the same lot as your main dwelling. A true ADU has all the equipment to function as an independent living space such as a bathroom, kitchen, living area, and sleeping area. ADUs come in different shapes and sizes but fall into two categories: attached or detached.
According to Phoenix ADU ordinance, every single-family detached lot is permitted one ADU in addition to its main dwelling unit. New ADUs are not permitted on lots with a preexisting ADU, a duplex, a triplex, or other multi-family homes.
The primary classification of an ADU is attached or detached. However, there are several possibilities for building ADU within those classes.
A detached ADU is a new structure built on the same lot but separate from the main residence. The ADU may be built from the ground up or a remodeled existing structure.
An attached addition is an functional living space that is built onto your existing home. It typically has a separate entrance allowing privacy for your guests or tenants.
Most interior ADUs involve remodeling an unused portion of your existing home like a basement or an attic. These spaces will need additional plumbing and electrical infrastructure.
If you don’t need your garage for storage, converting it into an ADU provides more functional living space. This project works for both attached and detached garages or carports.
The potential size of your ADU is determined by the size of your lot.
The maximum ADU size is 1,000 square feet or 75% of the gross floor area of the main home, whichever is less.
The maximum ADU size is 3,000 square feet, 75% of the gross floor area of the main home, or 10% of the net lot area, whichever is less.
Both attached and detached ADUs may be no taller than 15 feet without a special use permit.
In most cases, you will work with a general contractor like NextADU to handle the construction of your ADU. A custom ADU will require an architect to help with your ADU planning. Predesigned and prefab ADUs can simplify the process if you want to save time or lower your costs.
Take the first step toward enhancing your property with a custom ADU by contacting NextADU today. Request an estimate and let our expert team guide you through every phase.
NextADU wants to help Phoenix property owners improve their homes with well-built accessory dwelling units. We use a streamlined process that makes the path from planning to construction quick and painless, providing a unit that will give homeowners the extra space they need for guests, tenants, or a home office. Whether detached or attached, our expert team will build an ADU that exceeds your expectations.
