Accessory Dwelling Units

Last updated or reviewed on April 13, 2026

Review the Frequently Asked Questions section below if you are thinking of building an ADU on your property.

Frequently Asked Questions

What is an accessory dwelling unit (ADU)?

An accessory dwelling unit, also known as an ADU, is a small, private home that sits on the same land as your main house. To be an ADU, it must have its own:

  • Kitchen
  • Bathroom
  • Living area

There are two ways to build an ADU:

  • A separate building: This is a stand-alone cottage or “backyard suite” that is not attached to your main house.
  • Part of your house: This is a space built inside or onto your main house, like a basement or attic apartment.

Are ADUs allowed?

Yes. Asheville has always allowed ADUs. Review the Unified Development Ordinance (Municipal Code Sec 7-14-1) for details.

Why build an ADU?

ADUs are great for seniors, students, or new families. They also help homeowners earn extra money from rent. Since you already own the land, they are often cheaper to build than a standard house.

Can I build one on my property?

If your land is in a residential zone and has a single-family house on it, you can usually build one ADU. Check your property deed for “private restrictive covenants.” These are private rules that might ban ADUs. The City permit does not override those private rules.

Do I need a permit?

Yes. You must get a permit from the Development Services Department (DSD) before you start any work.

Pro Tip: We suggest hiring a professional surveyor. They will make sure your building is the right distance from property lines and underground pipes (like water and gas).

Can I build in a Historic District?

Yes, but there are extra steps. You must follow the design rules for your specific neighborhood.

  • Extra Permit: You will need a Major Work Certificate of Appropriateness.
  • Review: The Historic Resources Commission (HRC) must check your plans.
  • Contact the HRC: Call (828) 259-5638 or visit www.ashevillenc.gov/hrc to learn more.

How do I apply for an ADU permit?

Follow these three steps to build your small home (ADU).

Step 1: Research and ask questions

Review Unified Development Ordinance (UDO) requirements first. Then, talk to a city planner to discuss your project and the rules. You can reach the Planner of the Day here:

Step 2: Apply for a Residential building permit

Submit your application and building plans to the Development Services Department (DSD). You can do this two ways:

City staff will review your plans. They may ask you to make changes. You will update your plans and send them back for a final check.

Step 3: Start building and schedule inspections

You can start building once your plans are approved and you have your permit in hand. Schedule inspections as necessary. 

Important: City inspectors must visit your property at different times during the build. They will check the work to make sure it is safe and follows the rules.