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  • Writer's pictureSteve Morasse

Second Dwelling Units

Single-family zoning may have just doubled

Government Codes §§ 66452.6, 65852.21, 66411.7

As a result of Senate Bill 9, there has been some significant changes to single-family zoning. Through ministerial approval, property owners can construct up to two dwelling units on a single-family zoned parcel if the following criteria are met.

  • The parcel is located in a city or 'urbanized area'

  • The parcel is not located in a high-fire zone

  • The parcel is not located in a historic district

  • In some instances, setback requirements may apply

SB 9 also allowed property owners to obtain ministerial approval (exempt from CEQA) to split single-family residence lots into two separate lots. Each parcel must be at least 40% of the original parcel size, and the owner must affirm that they intend to reside on one of the parcels for at least the next three years.

This article provides only general information, and not legal advice. If you have any questions or if we can help evaluate on how this applies to you, please reach out to us at

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