Building Safety in Sonoma County, CA (2026)
6 county-level rules, plus city-specific rules for 2 cities in Sonoma County, California.
Verified from official government sources
Fire Sprinkler Requirements
Sonoma County requires automatic fire sprinklers in every new one- and two-family home, regardless of square footage, under its local amendment to the California Residential Code: with a narrow exception for small detached ADUs.
Sonoma County Fire Sprinkler Requirement
Heavy RestrictionsSonoma County Code § 7-13(D)(5) (CRC § R313.2)
R313.2 One- and two-family dwellings automatic fire sprinkler systems. An automatic residential fire sprinkler system shall be installed in townhouses. Group R-3 occupancies permitted under this code shall be provided throughout regardless of square footage with an automatic sprinkler system inclusive of all mobile homes, manufactured homes and multi-family manufactured homes with two or more d...
Green Building Code
Sonoma County amends the state Green Building Standards Code to require new single-family homes and their ADUs be built all-electric, with no gas or propane plumbing.
Sonoma County All-Electric New Home Rule
Significant RestrictionsSonoma County Code § 7-13(G) (CALGreen Section 4.509)
4.509.1 All-Electric Dwelling. Newly constructed single family residential dwellings, including accessory dwelling units, shall be designed and constructed as an all-electric dwelling. ... 4.509.2 Future Improvements. For single family residential dwellings subject to section 4.509.1, subsequent improvements, additions, remodels, repairs or similar work shall be consistent with 4.509.1 and the ...
Building Permits
Unincorporated Sonoma County requires a separate building permit for every building or structure that is erected, enlarged, altered, repaired, moved, converted, or demolished, issued by the Permit and Resource Management Department under County Code Section 7-5.
Sonoma County Building Permit Requirements
Some RestrictionsSonoma County Code § 7-5
No person, firm or corporation shall erect, construct, enlarge, alter, repair, move, improve, convert or demolish any building or structure in the unincorporated area of this county, or cause the same to be done, without first obtaining a separate building permit for each such building or structure as required by this chapter. Permits shall be issued and fees shall be collected by the permit an...
Electrical Permits
Sonoma County adopts the 2022 California Electrical Code and requires a permit for most electrical work in the unincorporated county, with a short, specific list of exemptions for minor repairs.
Sonoma County Electrical Permit Rules
Some RestrictionsSonoma County Code § 7-13(A)(4), (C)(2)
(4)CCR, Title 24, Part 3, 2022 California Electrical Code (CEC)... 105.2 Work exempt from permit... Permits shall not be required for the following:... (b)Electrical Permit Exemptions:1.Minor repair work, including the replacement of lamps or the connection of approved portable electric equipment to approved permanently installed receptacles.2.The provisions of this code shall not apply to elec...
Plumbing Permits
Unincorporated Sonoma County adopts the 2022 California Plumbing Code by reference under County Code Section 7-13, requiring a permit for plumbing installations and most repairs, reviewed and inspected by the Permit and Resource Management Department.
Sonoma County Plumbing Permit Requirements
Some RestrictionsSonoma County Code § 7-13(A)(6)
The following listed codes are hereby adopted and incorporated herein by reference, save and except such portions as are added, amended, deleted, modified or revised in subsequent sections. Included in the adoption are the matrix adoption table that precedes each chapter, appendix or annex within each part. The code sections and appendixes listed in the respective matric adoption table as being...
Building Inspections
Unincorporated Sonoma County charges a reinspection fee whenever a call for inspection finds work incomplete, uncorrected, or the site inaccessible, and the Permit and Resource Management Department will not perform further inspections until it is paid.
Sonoma County Building Reinspection Fees
Some RestrictionsSonoma County Code § 7-13(B)(4)
Reinspection Fees. A reinspection fee may be assessed for each inspection or reinspection when such portion of work for which inspection is called is not complete or when corrections called for are not made. This section is not to be interpreted as requiring reinspection fees the first time a job is rejected for failure to comply with the requirements of this code, but as controlling the practi...
Building Safety by City in Sonoma County
2 cities in Sonoma County have their own building safety rules. Each link goes to that city's dedicated page with code citations.
All Sonoma County ordinances
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