Sonoma County, CA Rental Property Rules: Rent Increase Notice (2026)
Key Facts
- Notice period
- At least 90 days, in writing
- Scope
- Mobile home park space rent only
- Languages required
- English and Spanish
- Governing section
- Sonoma County Code § 2-193(d)
- Not covered
- Ordinary house or apartment rentals
Summary
Mobile home park owners in unincorporated Sonoma County must give written notice of any space rent increase at least 90 days before it takes effect, provided in English and Spanish under the county's rent stabilization ordinance.
A notice of rent increase given by an owner pursuant to subsections (a), (b) or (c) of this section shall be given in writing at least ninety (90) days before any rent increase is to take effect. Any notice of rent increase provided to residents pursuant to this section shall be provided in English and Spanish by the mobilehome parkowner.(e)A notice of rent increase incorporating within it a proposed capital improvement which is not otherwise authorized as a pass-through pursuant to Civil Code Section 798.49 must be claimed within twelve (12) months of the completion of the project, construction or final billing. (Ord. No. 6450, § II, 11-7-2023)
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 64 Update 2).
Full Breakdown
Under Sonoma County Code § 2-193(d), a mobile home park owner must serve written notice of any space rent increase at least 90 days before it takes effect, in both English and Spanish, whether the increase falls within the annual CPI cap or requires the meet-and-confer and arbitration process under Section 2-195. This rule governs mobile home and long-term recreational vehicle park spaces in unincorporated Sonoma County only: it does not apply to ordinary house or apartment leases, which follow the state's Civil Code § 827 notice periods instead. The clerk of the Sonoma County Mobilehome Space Rent Stabilization Program (Community Development Commission) administers the process.
Violations & Fines
A resident may refuse to pay a rent increase issued without the required 90-day notice; that refusal is a valid defense under Sonoma County Code § 2-202 to any eviction action the parkowner files to collect it.
Frequently Asked Questions
Does this 90-day notice rule apply to my apartment rental in unincorporated Sonoma County?
What happens if a park owner raises space rent without giving 90 days notice?
Sources & Official References
Other rules in Sonoma County
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