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 No, Site Plan and Architectural Review (SPAR) is not required for new ADUs and JADUs. However, specific criteria need to be met if the subject property is in a historic district. See IZO § 7.030 (O.) for complete design requirements for ADUs on designated landmark sites or within a designated historic district.  

All ADUs less than 750 square feet, are exempt from development impact fees. All other ADUs must pay a fee, which as required by the new state legislation, must be based on the unit’s size relationship to its primary residence. More information about development impact fees is available on the City's Planning Applications and Handouts...

New parking is not required for Accessory Dwelling Units in Petaluma.

A Junior ADU or JADU is unit that is no more than 500 square feet in size and contained entirely within the walls of a single-family residence and may be constructed within an attached garage. A JADU is required to have an efficiency kitchen which complies with any applicable requirements of the Building Code, and includes a cooking...

The City of Petaluma has recently transitioned to an all-digital Online Permit Hub. You will need to register for an account and upload all application materials to this online portal. To apply online, please visit the following link to the City's Online Permit Hub: https://petalumaca-energovweb.tylerhost.net/apps/SelfService#/home