Nashville’s housing landscape is evolving to accommodate the needs of a growing population, and one of the more innovative approaches is the implementation of DADU (Detached Accessory Dwelling Unit) zoning overlays. These overlays allow property owners to build a secondary structure on their lot, often serving as a rental property, guest house, or office space. But what exactly is a DADU overlay, and how does it impact zoning in Nashville? Let’s break it down.
What is a DADU Overlay?
The term DADU refers to a Detached Accessory Dwelling Unit, which is a small, independent residential structure built on the same lot as a primary residence. Think of it as a separate, self-contained housing unit—a modern take on the traditional "granny flat" or backyard cottage.
A DADU overlay is a zoning tool that designates areas where DADUs are permitted. These overlays modify the base zoning to allow property owners to build a DADU, provided they meet specific requirements set by Metro Nashville.
Why is the DADU Overlay Important?
The DADU overlay is part of Nashville’s broader effort to increase housing options, support affordability, and encourage creative land use. With housing costs rising and urban sprawl becoming a concern, DADUs offer several benefits:
- —Housing Diversity: Provides additional housing options in neighborhoods dominated by single-family homes.
- —Income Potential: Homeowners can generate rental income or use the space for short-term rentals, subject to local regulations.
- —Flexibility: Creates a space for aging parents, adult children, or even a home office without requiring a separate property.
Where Can You Build a DADU in Nashville?
Not all neighborhoods in Nashville are eligible for a DADU overlay. Here are some key requirements and considerations:
- —Zoning Compatibility: Your property must be in a zoning district that allows for DADUs, such as single-family residential (R or RS zoning).
- —Lot Size Requirements: Generally, lots must meet a minimum size threshold to accommodate both the primary residence and the DADU.
- —Overlay Designation: The property must be located within a designated DADU overlay area. This requires Metro Council approval, often initiated by neighborhood or community requests.
- —Historic Considerations: If your property is in a historic overlay district, additional design and approval steps may apply.
What Are the Rules for Building a DADU?
Once your property qualifies for a DADU overlay, construction must adhere to Metro Nashville’s regulations, which cover:
- —Size: DADUs are typically limited to a certain percentage of the lot size or square footage of the main residence.
- —Setbacks: Minimum distances from property lines must be maintained.
- —Height: There are restrictions on how tall a DADU can be, often tied to the height of the main residence.
How to Apply for a DADU Overlay in Nashville
If your neighborhood isn’t currently covered by a DADU overlay, you can advocate for one by:
- —Engaging with your council member to propose a zoning change.
- —Working with neighbors to build community support.
- —Attending Metro Council meetings to voice your case during the public hearing process.
For property owners already in a DADU overlay, the next step is to consult with Metro Codes and a design professional to ensure your project complies with local regulations.
Is a DADU Right for You?
Building a DADU can be a great way to maximize the value of your property while contributing to Nashville’s housing ecosystem. However, it’s essential to evaluate the financial, legal, and practical implications. Consulting with professionals, including architects and zoning experts, will ensure your project aligns with both your vision and local requirements.
Disclosure
The information provided in this blog post is intended for general informational purposes only. While every effort has been made to ensure the accuracy and completeness of the content, zoning regulations are subject to change, and their interpretation may vary. Therefore, this post may not capture all nuances or recent updates.
Readers are advised to consult the Metropolitan Government of Nashville and Davidson County’s official zoning documentation or contact local zoning authorities for the most current and detailed information specific to their property or project. The author assumes no responsibility for any errors or omissions or for actions taken based on the information provided herein.
Resources
ORDINANCE NO. BL2011-900
NCZO for Turn-of-the-20th Century Districts Part I
NCZO for Mid-Century District
Belmont Hillsboro NCZO
Hillsboro West End NCZO