San Carlos, CA

Building an Urban Infill Unit SB 9

SB 9 (The California HOME Act) was signed by Governor Newsom on September 16, 2021, and became effective January 1, 2022.  SB 9 grants approval of: (1) a one-time, two-lot subdivision and subsequent development of up two units per resulting lot; or (2) development of up to four units on a lot that is not subdivided without any public hearing or discretionary (subjective) review. 

Background and Adoption of the Urban Infill Unit Ordinance

On January 10, 2022, the San Carlos City Council adopted an Urgency Ordinance to impose interim regulations and objective standards for the subdivision and development of qualified Senate Bill (SB) 9 properties, or as the City refers to as Urban Infill Units. On February 14, 2022, City Council approved the extension of the SB 9 Urgency Ordinance 1576 for a period of 10 months and 15 days.  

On November 13, 2023, the San Carlos City Council adopted the permanent SB-9 Ordinance 1603 which became effective on December 13, 2023. At this time the City’s previous Urgency Ordinance expired. Formally referred to as SB 9 units, the City now refers to these units as Urban Infill Units. The new Urban Infill Unit regulations has been incorporated into the San Carlos Municipal Code (see SCMC Section 18.23.310).  

For meeting information, agenda and staff reports visit the Public Meetings page.

Review and Permitting Process

An application for an Urban Infill Unit will need to be submitted to the Planning Division for review. Approval of the planning application is required before the building permit submission with applicable fees. No public hearing or discretionary review is required for urban infill projects. The length of the review process varies depending on the scope of the project and the completeness of the submission. Each round of review can take up to 30 days and a few rounds of review are common. To help expedite the process, the City highly encourages a re-application meeting with a planner. Once a formal application is submitted, applications will be assigned a planner who will notify applicants of the status of their application.

Eligibility Requirements for Urban Infill Units

Projects should meet all the following requirements:

General Development Requirements

Objective design standards, zoning regulations of the underlying zoning district may be applied:

Frequently Asked Questions

• What can I build under the SB 9?
• What is the maximum allowable size I can build?
• How should I split my lot under SB-9?
• Can I rent or sell the SB-9 units?
• Is environmental review required?
Categories always sorted by seq (sub-categories sorted within each category)
Documents sorted by SEQ in Ascending Order within category

Application and Resources

SB 9 Urgency Ordinance 1576
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California Legislation Senate Bill 9
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Urban Infill Unit Application
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