Sonoma, CA Building Safety: Building Permits (2026)
Key Facts
- Governing code
- 2025 California Building Code, § 101.2
- Exemption source
- Amended § 105.2 list
- Small shed exemption
- ≤120 sq. ft., ≤9 ft. tall, no utilities
- Unpermitted-work fee
- Investigation fee under § 109.4
- Appeal deadline
- 15 calendar days
Summary
The California Building Code, as adopted by the City of Sonoma, applies to nearly all construction, alteration, and repair of buildings and structures. Sonoma Municipal Code § 14.10.010 requires a permit for that work unless it falls on the short, specific exemption list added to Section 105.2, covering only minor items like small sheds, low fences, and small decks.
Section 101.2 is amended.101.2. The provisions of the California Building Code shall apply to the construction, alteration, relocation, enlargement, replacement, repair, equipment, use and occupancy, location, moving, maintenance, removal and demolition of every building or structure or any appurtenances connected or attached to such buildings or structures. ... Section 105.2 is amended.105.2 Work exempt from permit. Exemption from permit requirements of this code shall not be deemed to grant authorization for any work to be done in any manner in violation of the provisions of this code or any other laws or ordinances of this jurisdiction. Permits shall not be required for the following:
Official source re-checked September 8, 2026: no newer edition of the code had been published (publisher’s edition: current through Ordinance 13-2025, passed December 3, 2025).
Full Breakdown
2 of the 2025 California Building Code to state that its provisions apply to the construction, alteration, relocation, enlargement, replacement, repair, equipment, use and occupancy, location, moving, maintenance, removal, and demolition of every building or structure or any appurtenance connected to it. 2 then flips that broad scope into a permit rule: it opens by stating that permits shall not be required only for the items specifically listed, which include one-story accessory sheds under 120 square feet and 9 feet tall with no utilities, wood fences up to 7 feet or masonry fences up to 6 feet, retaining walls under 4 feet retaining no more than 3 feet of material, decks under 200 square feet and 30 inches above grade, and similar minor work.
Everything not on that list, including new construction, additions, structural alterations, and habitable accessory buildings, needs a permit before work starts. Exemption from a permit never authorizes work that otherwise violates the code or any city ordinance. 4 imposes an investigation fee on top of standard permit fees to cover the city's enforcement costs, and appeals of a building official's permit determination go to the board of appeals under Section 113 within 15 calendar days. The chapter is current through Ordinance 13-2025, passed December 3, 2025.
Violations & Fines
Constructing, altering, or repairing a building without the required permit is a violation of Chapter 14.10 SMC. Sonoma Municipal Code § 1.12.010(A)(4) sets an escalating fine of up to $100 for a first violation, $500 for a second violation of the same section within a year, and $1,000 for a third or subsequent violation, and § 109.4 adds a separate investigation fee for unpermitted work already performed.
Frequently Asked Questions
Does the City of Sonoma require a permit for a backyard shed?
What is the general rule for needing a building permit in Sonoma?
What happens if I build something in Sonoma without a permit?
Sources & Official References
Other rules in Sonoma
California rules heatmap·Compare Sonoma to another location·View the California building safety overview
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Building Permits in Nearby Cities
How other cities in Sonoma County handle building permits.