Zoning Tools

If you are thinking about building an ADU, either attached or detached, you will need to know the zoning designation of your property in order to look up the setbacks that apply to your property. Setbacks are the areas at the front, sides, and rear of your property in which you are not allowed to build. Use the links below to find your property’s zoning, such as “R1-B1”, “R-2”, “R1 B8, X”, etc. You can then consult your jurisdiction’s development standards document to determine the setbacks and lot coverage allowance that apply to your property. 

For homeowners in incorporated areas of Marin County

  • Go to Marin County’s Search Assessor Records & Maps page and type in your parcel number (you can find it on your property tax bill). Click on the parcel number to see more information, and from there you can “View Assessor Map” to see a parcel map which should include the lot line measurements.

 

For homeowners in unincorporated Marin County

  • Go to the County’s site and type in your address to see your zoning code and parcel number. The same page will tell you if you are in a “Community Plan” area with special zoning requirements, such as Bolinas or Tamalpais.
  • To confirm your lot measurements, use the parcel number to look up assessor records here. Click on the parcel number to see more information, and from there you can “View Assessor Map” to see a parcel map which should include the lot line measurements.
  • Look at the Development Standards Summary to see the non-coastal setbacks, height requirements, and maximum floor area ratio for your zoning code.
  • Or if  your property is in a coastal zone, look at the Coastal Development Standards Summary to see the setbacks, height requirements, and maximum floor area ratio for your coastal zoning code. 
  • The County’s septic requirements that pertain to remodeling are outlined in this publication, and even more information on septic systems is available here.

 

For homeowners in unincorporated Sonoma County

  • Go to the County’s site. Enter your parcel number (found on property tax bills) or your address to see the details.