Accessory Dwelling Units (ADUs)

ADU next to main structure

What is an Accessory Dwelling Unit?

An Accessory Dwelling Unit (or, “second unit,” “in-law unit,” or “granny unit”) is an additional dwelling located on the same lot as a single-family or multi-family development. An Accessory Dwelling Unit (ADU) may be attached to the primary residence, detached from the primary residence, or contained within an existing residence or accessory structure. A Junior Accessory Dwelling Unit (JADU) is a unit in an owner-occupied residence that is no more than 500 square feet and contained entirely within the existing single-family structure.

To learn more about ADUs, please visit the Ross ADU fact sheet.

 

Building your ADU

Follow the steps below to get your ADU approved and built!

  1. Review the ADU/JADU regulations as described in the municipal code. If your ADU meets these requirements, it can be ministerially approved. Otherwise, it will need to go through ADR and Town Council approval.
  2. Work with an architect or engineer to prepare building plans. For inspiration, visit the ADU Marin website.
  3. Email a copy of the all the ADU permit checklist documents to alopezvega@townofross.org.

The Town follows State ADU laws. A complete description of local ADU regulations can be found in Chapter 18.42 Accessory Dwelling Units

 

I need ideas for my new ADU!

See ADU Marin for information on each step of the process, from thinking about building to permits and construction. It features stories from homeowners who have built an ADU and renters now living and working in Marin, along with more than a dozen floor plans. Plus, there is a calculator to estimate what it might cost and potential rental income. The workbook goes deeper into the process and is full of exercises, checklists, and activities. Whether a homeowner needs to brainstorm ideas, choose a contractor, find a tenant to rent their finished ADU, they will find helpful guidance and resources each step of the way. 

Visit ADU Accelerator to check out some pre-approved ADU designs. These designs are done by professionals and are ready to finalize and submit to permitting, saving you time and money.

 

Who will live in my ADU?

Home Match is a free service based out of San Rafael that connects people seeking to rent a room in their home or ADU on their property with community members seeking affordable housing options. Home Providers benefit from additional income, companionship, and, or help with chores such as grocery shopping, pet care, or transportation. Home Seekers benefit from increased access to affordable housing options and navigation services.

Visit Home Match’s website to learn more.

Contact Home Match Marin at HomeMatchMarin@frontporch.net or call (415) 456-9068 to get started today.