TO: Board of Supervisors
FROM: Brian D. Bordona, Director of Planning, Building and Environmental Services
REPORT BY: Trevor Hawkes, Supervising Planner
SUBJECT: Amendments to Titles 17 & 18 of the Napa County Code related to Urban Lot Splits and Two-Unit Development
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RECOMMENDATION
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Introduction and intent to adopt an Ordinance of the Napa County Board of Supervisors, State of California, amending the Napa County Code Section 17.17.020 (Approval of Map) and 17.17.040 (Specific Adverse Impact) of Chapter 17.17 (Urban Lot Splits) of Title 17 Subdivisions) and Section 18.104.440 (Two Unit Developments) of Chapter 18.104 (Additional Zoning District Regulations) to bring the Code into alignment with current State law regarding Urban Lot Splits and Two-Unit Developments. (No Fiscal Impact; Discretionary)
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BACKGROUND
Proposed amendment to Napa County Code (NCC) sections due to current State housing law concerning Urban Lot Splits and Two-Unit Developments (Senate Bill 9 of 2021 and SB 450 of 2024).
PBES Staff, County Counsel and outside legal counsel have prepared the draft ordinance for Board consideration, amending NCC Chapter 18.104 (Two-unit Developments) and NCC Chapter 17.17 (Urban Lot Splits), due to amendments to the Government Code through legislative session 2025. All proposed amendments are intended to make the NCC current with the minimum required standards of state law. Please refer to the Executive Summary in Attachment C for a summary of modifications to each individual section.
Primarily the draft ordinance proposes amendments to the NCC due to Senate Bill 450 (2024). SB 450 made the following amendments to Government Code sections 65852.21 and 66411.7, the core statute governing Two-Unit Development and Urban Lot Splits, summarized as follows:
Objective standards imposed on Urban Lot Splits and Two-Unit Development projects must generally also apply uniformly to the underlying single-family zone. Agencies cannot create special restrictive...
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