This is a brief explanation of what some the numbers mean in the zoning code designations and how they relate to parcel density and minimum acreage.
The Zoning by Area dataset represents the location of base zoning districts (AR, C1, R2, etc.), density restrictions, and parcel specific combining districts (TS, X, Z, etc.) as specified in Sonoma County Code Zoning Regulations Chapters 26 and 26C.
Many properties have density restrictions. The following are explanations of zoning density:
- Uban areas: Density limitation is expressed as "number of dwelling units per acre." For example, "R2 B6 10 DU/AC" means the density is 10 dwelling units per acre in this zoning district.
- Rural areas: Density limitation is expressed as "number of acres per dwelling unit." For example, "RRD 60" means the density allows one dwelling unit for every 60 acres of land.
Minimum Lot Size Requirement
Some properties also have a minimum lot size requirement. This minimum is indicated by a second number following the density. Examples:
- "AR B6 10/3" means the density is one dwelling unit per 10 acres and the minimum lot size is 3 acres for purposes of subdivisions.
- "RRD CC B6 160/240" means the density is one dwelling unit per 160 acres and the minimum lot size is 240 acres for purposes of subdivisions.