A lease extension agreement in California is a short written document that continues an existing tenancy past its original end date, changing only the terms the parties agree to change — typically the end date and the rent — while everything else in the original lease carries forward. Because it counts as a renewal of the tenancy, state limits on rent increases, security deposits, notice timing, and required disclosures apply even when both sides are willing.
What to Put in the Extension
The document is short, but it has to stand on its own if a dispute comes up later. Include the full legal names of every landlord and tenant on the original lease, the property address, and the date the original lease was signed. Then state the exact start and end dates of the extension period. If you leave the end date open, you have effectively created a month-to-month tenancy, which follows different termination rules than a fixed term.
The new monthly rent amount is the centerpiece. Any change to the security deposit belongs in writing too. Beyond the money terms, add a clause stating that all other terms and conditions of the original lease remain in effect unless specifically modified. That incorporation language keeps pet policies, maintenance responsibilities, parking arrangements, and every other existing obligation alive without restating each one.
Every person named on the original lease should sign the extension. If a co-tenant or guarantor is left off, the extension may not bind them, which can leave the landlord exposed if that person later claims they never agreed. Where roommates have changed since the original lease, the extension is the moment to add or remove names and collect signatures.
How Much the Rent Can Go Up
For properties covered by the Tenant Protection Act of 2019 (AB 1482), the annual rent increase is capped at 5 percent plus the local percentage change in the Consumer Price Index, or 10 percent, whichever is lower.1California Legislative Information. California Code Civil Code 1947.12 – Limitations on Rental Rate Increases The CPI figure used depends on when the increase takes effect: increases before August 1 use the prior year’s April-over-April CPI, and increases on or after August 1 use the current year’s April data. CPI varies by region, so the exact ceiling depends on where the property sits.
Rent increases are also limited to two increments in any 12-month period, measured from the lowest rent charged during the prior 12 months.1California Legislative Information. California Code Civil Code 1947.12 – Limitations on Rental Rate Increases If you’re drafting a multi-year extension with scheduled bumps, build these limits into each year so the document doesn’t violate the statute on its face.
Properties Exempt From AB 1482
Not every rental is covered. Single-family homes and condominiums are exempt if the owner is not a corporation, a real estate investment trust, or an LLC with a corporate member, and if the owner has provided the required written notice to the tenant.2California Legislative Information. California Code Civil Code 1946.2 – Termination of Tenancy for Just Cause Housing built within the last 15 years is also generally exempt, along with certain owner-occupied duplexes and properties already covered by a local rent control ordinance restricting annual increases.
For any tenancy started or renewed on or after July 1, 2020, a landlord claiming the single-family or condo exemption must include the statutory notice language directly in the rental agreement, not as a separate document.3City of Berkeley. AB 1482 – The California Tenant Protection Act of 2019 Because a lease extension counts as a renewal, the exemption notice belongs in the extension itself. Skip it and the property loses the exemption, becoming subject to both the rent cap and just cause eviction rules. If the exemption status has changed since the original lease — for instance, a building that has aged past the 15-year threshold — the extension is the place to update the disclosure.
Notice Timing for the Rent Change
California’s rent-increase notice rules still apply even when the increase is part of a mutually signed extension. For increases of 10 percent or less, calculated over the prior 12 months and including any earlier increases, the landlord must provide at least 30 days’ written notice. For increases above 10 percent, the required notice jumps to 90 days.4California Legislative Information. California Code Civil Code 827 – Terms of Hiring
The practical takeaway is timing. If you’re planning an extension with a significant rent bump, start the conversation well before the current lease expires. Handing a tenant an extension with a 12 percent increase two weeks before the lease ends doesn’t meet the 90-day requirement, even if the tenant signs willingly.
Adjusting the Security Deposit
Since July 1, 2024, the default maximum security deposit in California is one month’s rent, whether the unit is furnished or unfurnished. A narrow exception allows up to two months’ rent, but only if the landlord is a natural person (or an LLC whose members are all natural persons) who owns no more than two rental properties totaling four or fewer units.5California Legislative Information. California Code CIV 1950.5 – Security for Rental Agreement That exception disappears if the tenant is a service member.
This replaced the earlier rule that allowed two months’ rent for unfurnished units and three for furnished. If the existing deposit already exceeds the current cap, the landlord cannot demand additional money at extension time. Any deposit change should state the new total amount being held.
Disclosures That Belong in the Extension
The AB 1482 exemption notice, discussed above, is the disclosure that most often needs to appear in the extension itself.
Federal law also requires landlords of housing built before 1978 to disclose known lead-based paint hazards and provide the EPA pamphlet “Protect Your Family From Lead in Your Home.”6U.S. Environmental Protection Agency. Real Estate Disclosures about Potential Lead Hazards Federal regulations carve out an exception for lease renewals: a fresh disclosure is not required at renewal if all required disclosures were made at the original signing, unless the landlord has learned of new lead hazard information since then.7eCFR. 24 CFR Part 35 Subpart A – Disclosure of Known Lead-Based Paint and Lead-Based Paint Hazards If the property has been renovated or retested since the original lease, redoing the disclosure with the extension is the safer move.
Making It Legally Binding
California’s Statute of Frauds requires any lease lasting longer than one year to be in writing and signed by the parties.8California Legislative Information. California Code Civil Code 1624 – Manner of Creating Contracts An extension that pushes the total tenancy beyond a year falls within that rule. Even for shorter extensions, putting it in writing prevents the disputes that come with oral changes.
Electronic signatures carry the same legal weight as ink signatures under California’s Uniform Electronic Transactions Act, provided both parties agree to transact electronically.9Justia. California Code Civil Code 1633.1-1633.17 – Uniform Electronic Transactions Act Platforms like DocuSign and HelloSign work fine for lease extensions. Paper works too.
Once signed, the landlord must deliver a fully executed copy to the tenant within 15 days.10California Legislative Information. California Code Civil Code 1962 – Identification of Property Owners Electronic signing platforms usually handle this automatically. For paper signings, hand-delivering or mailing a copy and keeping proof of delivery is the straightforward path.
If the Lease Expires Without an Extension
If the fixed term ends and the tenant stays while the landlord keeps accepting rent, California law presumes the tenancy has renewed on a month-to-month basis under the same terms as the expired lease.11California Legislative Information. California Code Civil Code 1945 – Renewal of Hiring by Lessee’s Continued Possession That default trades the stability of a fixed term for month-to-month flexibility, which cuts both ways.
Ending a month-to-month tenancy requires written notice. A landlord must give at least 30 days’ notice if the tenant has occupied the unit less than a year, or 60 days if the tenancy has lasted a year or more. A tenant needs only 30 days regardless of length of occupancy.12California Legislative Information. California Code Civil Code 1946.1 – Termination of Hiring of Real Property
For AB 1482–covered properties, one wrinkle is worth knowing. Once a tenant has occupied the unit for 12 months, the landlord cannot terminate the tenancy without “just cause,” even on a month-to-month basis. Just cause covers at-fault reasons like nonpayment of rent or lease violations, and no-fault reasons like the owner moving in or removing the unit from the rental market. If a landlord offers a reasonable extension and the tenant refuses to sign, that refusal itself qualifies as at-fault just cause for eviction under the statute.2California Legislative Information. California Code Civil Code 1946.2 – Termination of Tenancy for Just Cause The offered extension must be for a similar duration with similar provisions and cannot violate any law, so this can’t be used as leverage to push illegal terms.
Local Rent Control May Add More Rules
AB 1482 is the statewide floor, not the ceiling. More than 30 California cities, including Los Angeles, San Francisco, Oakland, Berkeley, Santa Monica, San Jose, and West Hollywood, have their own rent control ordinances that may impose stricter caps, registration requirements, or different rules for renewals. Where a local ordinance provides greater tenant protection than state law, the local ordinance typically controls. Before finalizing an extension, check whether the property sits in one of these jurisdictions and whether the proposed rent increase complies with that city’s specific limits and notice procedures.