Redwood City, CA Building Safety: Electrical Permits (2026)
Key Facts
- Adopted electrical code
- 2025 California Electrical Code (Title 24, Pt. 3)
- Local amendment
- Sec. 9.83 adds Electrical Code § 300.6(A)(4)
- Banned material
- Metallic conduit underground in Bay Mud zones
- No-permit penalty
- 2x permit fee under Sec. 9.43
- Conflict rule
- Most restrictive adopted code governs
Summary
Redwood City enforces the 2025 California Electrical Code by reference under Sec. 9.40, with one local amendment, Sec. 9.83, that bars metallic conduit underground anywhere the city's "Special Bay Mud" map applies, protecting wiring from the Bay's corrosive soils.
Title 24, Parts 1, 2, 2.5, 3, 4, 5, 6, 7, 8, 10, 11, and 12 of the California Codes of Regulations, namely the (2025) California Building Codes ..., Residential, Electrical, Mechanical, Plumbing, Energy, Wildland-Urban Interface, Historical Building, Existing Building, Green Building Standards, and California Reference Standards Codes ... are hereby adopted by reference, with the amendments, additions and modifications set forth hereinafter in this Chapter. Chapter 1 of the 2025 California Building Code, Chapter 1 of the 2025 California Residential Code, Article 89 of the 2025 California Electrical Code, Chapter 1 of the 2025 California Mechanical Code and Chapter 1 of the 2025 California Plumbing Code are hereby adopted by reference, with the amendments, additions and modifications set forth hereinafter in this Chapter. ... In the event there are conflicts between the provisions of these Codes and other codes or provisions adopted by the City, the most restrictive provision shall apply. ... Section 300.6(A)(4) Metallic conduit shall not be used underground in those areas indicated on the map entitled "Where Special Bay Mud Requirements Apply" available through the City website.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Zoning Code: Supplement 29 | City Code: Supplement 61 Update 1).
Full Breakdown
40 adopts Title 24, Part 3 of the California Code of Regulations, the 2025 California Electrical Code, by reference as the electrical law of the City, together with Article 89 of that Code and the City's Building, Residential, Plumbing, Mechanical and Energy Codes from the same cycle, and directs that when two of these adopted codes conflict, the most restrictive provision applies. 6(A)(4), barring metallic conduit underground in any area shown on the City's "Where Special Bay Mud Requirements Apply" map, the same soft, corrosive-soil zone that drives the City's parallel bans on metallic water, drain, vent and storm piping in the Plumbing Code.
An electrical permit applicant working inside a mapped Bay Mud parcel must specify non-metallic conduit for any underground run rather than the rigid metal conduit the base Electrical Code would otherwise allow. 7B of the Redwood City Code, with each day a violation continues counted as a separate offense.
Violations & Fines
Installing electrical work that violates the adopted 2025 Electrical Code or the Bay Mud conduit amendment is unlawful under Section 9.3 and punishable under Section 1.7B of the Redwood City Code, with the Building Official or an authorized Building Division representative empowered to cite the violation. Each day it continues is a separate offense, and starting work without the required electrical permit adds a fine equal to twice the permit fee under Section 9.43.
Frequently Asked Questions
What electrical code does Redwood City enforce?
Can I run metal conduit underground anywhere in Redwood City?
What is the penalty for electrical work without a permit?
Sources & Official References
Other rules in Redwood City
California rules heatmap·Compare Redwood City to another location·View the California building safety overview
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