Rental Property Rules in San Mateo, CA: What Residents Actually Need to Know

If you live in San Mateo or are thinking about moving there, rental property rules are one of those things you probably won't think about until they affect you directly. San Mateo has 3 specific rules on the books covering different aspects of rental property rules, and some of them might surprise you.

Rent Control

San Mateo does not have a local rent control ordinance. Covered rental properties are subject to California AB 1482 (Tenant Protection Act), which caps annual rent increases at 5% plus CPI or 10%, whichever is less. San Mateo County CPI determines the specific cap each year.

Key details: Local Rent Control: None — AB 1482 only. Cap Formula: 5% + CPI or 10% (lower of two). CPI Region: San Mateo County/SF area. Notice Required: 30 days (<10%); 90 days (>10%). Expiration: AB 1482 expires Jan 1, 2030.

Rent increases exceeding AB 1482 caps are void. Tenants may recover excess rent plus attorney's fees. The California AG's office enforces statewide.

Just Cause Eviction

San Mateo adopted an emergency just cause eviction ordinance (Ord. 2019-12) providing local protections that complement AB 1482. Landlords must cite a specific just cause for terminating tenancies of 12+ months. No-fault evictions require one month's rent as relocation assistance.

Key details: Local Ordinance: Ord. 2019-12 — just cause. Effective Date: Retroactive to Oct 1, 2019. At-Fault Causes: Non-payment, breach, nuisance. No-Fault Causes: Owner move-in, renovation, withdrawal. Relocation: One month rent (no-fault).

Terminating without just cause is subject to legal challenge. Tenants may recover damages including moving costs and rent differential. Retaliatory evictions prohibited under CC 1942.5.

This is one of the stricter rules in San Mateo's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.

Rental Registration

San Mateo does not require a separate rental property registration program. Landlords must obtain a city business license. The city follows state law habitability requirements. Code Enforcement handles complaints about rental property conditions.

Key details: Registration: None — no mandatory program. Business License: Required. Inspections: Complaint-based only. Habitability: CA Civil Code §1941. Contact: Code Enforcement — 650-522-7200.

Operating without a business license may result in citations. Substandard conditions face Code Enforcement action. AB 1482 violations enforceable through civil action.

The rules around rental registration in San Mateo lean permissive, but that does not mean anything goes.

The Bottom Line

San Mateo's rental property rules rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming San Mateo is broadly strict or permissive.

This guide is based on San Mateo's current municipal code. Local rules can and do change, so check the individual ordinance pages for the latest details, penalties, and FAQs.