How to Increase Rent Month-to-Month California | TrueDoor PM
By Kyle Thompson, Co-Founder | Broker License #01847619 | NARPM Member | CalNARPM Member
Published June 7, 2026 | TrueDoor Property Management | truedoorpm.com
How to Increase Rent Month-to-Month in California
The short answer: California landlords must give 30 days written notice for rent increases of 10% or less, and 90 days written notice for increases greater than 10%. The 10% threshold is calculated from the lowest rent charged in the prior 12 months, not the current rent. If your property is covered by AB 1482 (the Tenant Protection Act), your annual increase is also capped at 5% plus local CPI or 10%, whichever is lower. Always check local ordinances first because city rules can be stricter than state law.
Raising rent in California sounds simple until you get into the details. California Civil Code Section 827 sets the notice rules, AB 1482 caps what you can raise for covered properties, and many cities layer on rent control ordinances that are even more restrictive. A single procedural mistake, like using the wrong notice period or calculating the 10% threshold from the wrong baseline, can expose you to legal liability, void the increase, or trigger a tenant dispute.
At TrueDoor Property Management, we handle rent increase notices for property owners across Orange County and the Inland Empire from our offices in Irvine, Huntington Beach, Redlands, and Murrieta. We track every CPI announcement, calculate permissible increases, prepare the written notices, and document delivery. In almost 20 years of managing California rental properties, we have watched this area of landlord-tenant law become significantly more technical. This guide walks through every rule you need to know before you send a rent increase notice.
Table of Contents
- CA Civil Code 827: The Notice Period Rules
- How to Calculate the 10% Threshold Correctly
- AB 1482 Annual Rent Increase Caps
- Is Your Property Covered or Exempt from AB 1482?
- Local Rent Control: When City Rules Are Stricter
- CPI Calculation Example for 2025-2026
- Rent Increases on Fixed-Term Leases
- Step-by-Step Process for Raising Rent Properly
- Common Landlord Mistakes and How to Avoid Them
- How TrueDoor Handles Rent Increases for Owners
- Frequently Asked Questions
- Rent Increase Quick-Reference Cheat Sheet
CA Civil Code 827: The Notice Period Rules
California Civil Code Section 827 governs how landlords must notify month-to-month tenants of a rent increase. The law creates two distinct tiers based on the size of the increase relative to the lowest rent charged in the preceding 12 months.
Increase of 10% or Less
When your total increase from the lowest rent in the past 12 months is 10% or under, a 30-day written notice satisfies the statute.
Increase of More Than 10%
When your total increase from the lowest rent in the past 12 months exceeds 10%, a 90-day written notice is required by law.
The notice must be in writing. Best practice is to serve it in two ways at the same time: personal delivery to the tenant at the rental unit and certified mail to the same address. This belt-and-suspenders approach creates a documented record of the delivery date and eliminates disputes about when notice was received.
Effective date math matters. The notice period is counted from the date the tenant receives the notice, not the date you mail or prepare it. If you hand-deliver on June 1 and mail on June 1, a 30-day notice makes the new rent effective July 1 at the earliest. A 90-day notice makes it effective September 1. Build that buffer into your planning.
The written notice must include: the rental property address, the tenant’s name, the current rent amount, the new rent amount, and the effective date of the change. You do not need to state a reason for the increase on a month-to-month tenancy, unless local ordinances require one. Some rent-controlled cities do require a reason in the notice. We cover that in the local rent control section below.
TrueDoor calculates the correct notice period, drafts compliant notices, and documents delivery for owners across Orange County and the Inland Empire. Call us at (714) 899-2200.
How to Calculate the 10% Threshold Correctly
The most common mistake we see from self-managing landlords is calculating the 10% threshold from the current rent instead of from the lowest rent charged in the preceding 12 months. These are not always the same number, and getting this wrong can mean you give an inadequate notice period.
Here is how the calculation works. Look back at every rent amount charged during the 12 months before the proposed effective date of the increase. Find the lowest rent charged during that entire window. Your increase is measured as a percentage of that lowest amount, not the current amount.
Worked example: Suppose you reduced rent for two months in late 2025 from $2,400 to $2,200 as a concession. The current rent is back up to $2,400. You want to raise rent to $2,600.
The lowest rent in the past 12 months was $2,200. The increase from $2,200 to $2,600 is $400, which is 18.2% of $2,200. That exceeds 10%, so a 90-day notice is required, even though the increase from the current $2,400 appears to be only 8.3%.
If you had only looked at the current rent, you would have given the wrong notice period and exposed yourself to a legal challenge.
If you have not changed the rent at all during the past 12 months, the lowest rent and the current rent are the same number, and the calculation is straightforward. The complexity arises when there have been concessions, temporary reductions, or prior increases during the look-back window.
Keep written records of every rent amount charged, including any temporary concessions or free-rent periods. These records become the basis for your threshold calculation whenever you plan a future increase.
AB 1482 Annual Rent Increase Caps
California’s Tenant Protection Act of 2019, known as AB 1482, added a second layer of restriction on top of the Civil Code 827 notice rules. For properties the law covers, AB 1482 caps how much you can increase rent in any 12-month period regardless of how much notice you give.
The AB 1482 annual cap is: 5% plus the local Consumer Price Index (CPI) or 10%, whichever is lower. This cap applies to the 12-month period ending on the effective date of the proposed increase. Landlords on covered properties cannot increase rent by more than this cap even if they provide 90 days of notice.
AB 1482 applies annually, not per notice. If you already raised rent 3% in January 2026 on a covered property, and you want to raise rent again in August 2026, you must count both increases together. The total cannot exceed the cap for that 12-month period. You cannot reset the clock by waiting until the lease renews.
AB 1482 also prohibits “rent banking” where increases accumulate unused and are applied in a large jump years later. Each 12-month period is evaluated independently.
The CPI figure used for AB 1482 is the regional All-Items CPI published by the California Department of Industrial Relations or the DFEH for the metropolitan statistical area covering the property. The OC-Los Angeles MSA and the Riverside-San Bernardino-Ontario MSA each have their own figures. These are announced annually and the effective dates vary by region.
TrueDoor verifies coverage status, tracks the annual CPI announcement, and calculates the maximum allowable increase for every property we manage. (714) 899-2200.
Is Your Property Covered or Exempt from AB 1482?
AB 1482 does not apply to every rental property in California. The law carves out several categories of exempt properties. Knowing where your property stands determines whether the annual cap applies at all.
| Property Type | AB 1482 Status | Key Condition |
|---|---|---|
| Multi-family buildings 15+ years old | COVERED | Built before 2010 as of January 2026; first certificate of occupancy 15+ years ago |
| New construction built within 15 years | EXEMPT | Certificate of occupancy issued within the past 15 years from the effective date of any increase |
| Single-family homes (SFR) owned by individuals | EXEMPT | Owner must deliver required AB 1482 exemption notice; institutional owners are NOT exempt |
| Condominiums | EXEMPT | Required exemption notice must be provided to tenant; applies to individually sold units |
| Owner-occupied duplex (owner lives in one unit) | EXEMPT | Owner must occupy one unit as primary residence at the time notice is given |
| HUD affordable housing or deed-restricted affordable units | EXEMPT | Covered by separate affordability restrictions that govern rents independently |
| Student dormitories and school-owned housing | EXEMPT | Must be owned or operated by an educational institution |
| Multi-family buildings less than 15 years old (older than new construction threshold) | CHECK DATE | Exemption is time-limited; buildings age into coverage as the 15-year window passes |
Exemption notice requirement: If your single-family home or condominium qualifies for the AB 1482 exemption, California law requires you to provide a written exemption notice to the tenant. The statutory notice language is set by Civil Code Section 1947.12(d)(5). Failure to provide this notice does not remove the exemption, but it is best practice and may affect certain local protections. TrueDoor includes this notice in all qualifying new leases and renewals.
The 15-year exemption window is not fixed. A building that was new construction in 2010 and exempt through 2024 became covered by AB 1482 starting January 1, 2025. Landlords who managed these properties under the assumption they were exempt needed to recalibrate their rent increase practices at that transition point. We review this calendar annually for every property we manage.
Local Rent Control: When City Rules Are Stricter
AB 1482 is a floor, not a ceiling. Cities with local rent stabilization ordinances can impose stricter rules than the state law, and many do. If a city ordinance applies to your property, the local rules take precedence over state minimums wherever they are more restrictive.
| City / Area | Local Rent Control? | Annual Increase Cap | Properties Covered |
|---|---|---|---|
| Los Angeles (City) | Yes (RSO) | 3% or CPI, whichever is lower; has been 3% in recent years | Multi-family units built before October 1, 1978; condos and SFRs generally exempt from RSO |
| Santa Ana | Yes (local ordinance) | 3% annually for covered units | Most multi-family residential units; check ordinance for building-age threshold |
| Long Beach | Yes (LBRO) | CPI or 3%, whichever is lower, for covered units | Multi-family residential built before June 30, 1978 |
| Anaheim | No local ordinance | AB 1482 applies to covered buildings (5% + CPI, max 10%) | Buildings 15+ years old meeting AB 1482 criteria |
| Irvine | No local ordinance | AB 1482 applies to covered buildings | Primarily newer planned developments; many are new construction exempt |
| Huntington Beach | No local ordinance | AB 1482 applies to covered buildings | Older multi-family stock on Beach Boulevard corridor and inland areas |
| Redlands | No local ordinance | AB 1482 applies to covered buildings | Older multi-family units; many SFRs are individually owned and exempt |
| Murrieta | No local ordinance | AB 1482 applies to covered buildings | Mostly planned communities; new construction exempt for first 15 years |
TrueDoor practice: For every property we manage, our first step before recommending any rent increase is confirming the applicable regulatory framework. Orange County cities like Irvine, Huntington Beach, and Anaheim generally follow the AB 1482 state standard without local overlays, while Santa Ana has its own stricter ordinance. Inland Empire cities like Redlands and Murrieta currently follow state law. However, local ordinances can change, and we monitor city council activity in each jurisdiction where we operate.
TrueDoor monitors rent control ordinances across Orange County and the Inland Empire. We tell you exactly what applies before you send any notice. Call (714) 899-2200 to speak with a property manager.
CPI Calculation Example for 2025-2026
Calculating the AB 1482 cap requires knowing the current regional CPI for your property’s metropolitan statistical area. The California Department of Industrial Relations publishes regional CPI figures each year. Property owners subject to AB 1482 should verify the current announced figure before finalizing any increase.
Which CPI applies to your property? Properties in Orange County and the Los Angeles Basin fall under the Los Angeles-Long Beach-Anaheim MSA. Properties in the Inland Empire fall under the Riverside-San Bernardino-Ontario MSA. Each MSA publishes a separate CPI figure. Check the California DIR website for the most current announced percentage before calculating.
For illustrative purposes, recent CPI figures for the Los Angeles-Long Beach-Anaheim MSA relevant to rent control purposes have ranged from approximately 3% to 4%. Here is how the calculation works with a sample figure:
| Variable | Example A (OC property) | Example B (IE property) |
|---|---|---|
| Current monthly rent | $2,400 | $1,950 |
| Regional CPI (illustrative) | 3.5% (LA-Long Beach-Anaheim) | 3.2% (Riverside-San Bernardino) |
| AB 1482 formula result | 5% + 3.5% = 8.5% | 5% + 3.2% = 8.2% |
| Statutory maximum | 10% (cap) | 10% (cap) |
| Applicable max % (lower of formula or 10%) | 8.5% | 8.2% |
| Maximum dollar increase allowed | $204/month | $160/month |
| New maximum rent | $2,604/month | $2,110/month |
Note that these examples use illustrative CPI figures for educational purposes. The actual CPI percentage announced for the current year may differ. Always pull the official figure from the California DIR or contact TrueDoor for the current applicable rate before sending any notice on a covered property.
The CPI component of the formula changes every year. An increase that was within the cap in 2024 may need to be recalculated for 2025 or 2026. We recommend owners not assume last year’s calculation still applies. Verify the current announced figure every time.
Rent Increases on Fixed-Term Leases
The notice rules under Civil Code Section 827 apply specifically to month-to-month tenancies. A fixed-term lease, such as a 12-month lease with a set end date, works differently. Once a fixed-term lease is signed, the rent is locked for the duration of the lease term unless the lease itself contains a written provision allowing for an increase during the term.
Most standard residential leases do not contain mid-term rent increase clauses. For the overwhelming majority of fixed-term leases in California, you cannot raise the rent until the term expires. At that point, you can offer a new lease or renewal at a different rent, or allow the tenancy to convert to month-to-month and then send the appropriate notice under Civil Code 827.
Fixed-term lease trap: Even if you want the tenant to go month-to-month so you can raise rent, you cannot unilaterally change the terms of a fixed-term lease before the end date. The tenant has the right to the agreed rent through the end of the term regardless of what you decide mid-lease. Plan rent adjustments around lease renewal dates, not spontaneously mid-term.
When a fixed-term lease expires and converts to month-to-month, all the Civil Code 827 and AB 1482 rules snap back into effect immediately. The tenant is now month-to-month, and you must give proper written notice with the correct notice period before any new rent amount takes effect. Converting to month-to-month does not give you a free pass on notice periods or the annual cap.
TrueDoor handles lease renewals, renewal negotiations, and rent increase notices for OC and IE property owners. We make sure every transition is legally compliant. (714) 899-2200.
Step-by-Step Process for Raising Rent Properly
Following a consistent process every time you raise rent protects you from procedural errors and creates the paper trail you need if there is ever a dispute. Here is how TrueDoor approaches rent increases for every property we manage.
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1Confirm regulatory framework before anything elseVerify whether your property is subject to AB 1482, a local rent control ordinance, or neither. Check the city where the property is located, the building’s age and type, and your ownership structure. This determines both the allowable increase amount and notice period requirements.
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2Pull the current CPI if AB 1482 appliesGet the most recently announced CPI figure from the California DIR for the correct MSA. Calculate 5% plus local CPI. Compare to the 10% statutory cap. Use whichever is lower as your maximum allowable increase for the 12-month period.
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3Find the lowest rent in the past 12 monthsReview your payment records and any concession letters for the preceding 12 months. Identify the lowest rent actually charged. This is your baseline for the Civil Code 827 threshold calculation, not the current rent amount.
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4Calculate the increase percentage and determine notice periodDivide the proposed new rent minus the lowest prior rent by the lowest prior rent. If the result is 10% or under, a 30-day notice is required. If the result exceeds 10%, a 90-day notice is required. If AB 1482 applies, also confirm the increase does not exceed the annual cap.
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5Prepare the written noticeThe notice must include: the property address, tenant’s name, current rent, new rent amount, and effective date. The effective date must be at least 30 or 90 days from the delivery date, not the preparation date. If your city requires a statement of reason, include it.
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6Serve notice by personal delivery and certified mail simultaneouslyHand-deliver a copy to the tenant or leave it with a person of suitable age at the property, and also send a copy by certified mail on the same day. Keep the certified mail receipt, the tracking confirmation, and a copy of the notice in your files.
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7Document everything and update your recordsRecord the delivery date, new rent amount, and effective date in your property management records. Update your lease addendum if required. Set a calendar reminder to verify that the new rent posts on the effective date so you catch any collection issues immediately.
Common Landlord Mistakes and How to Avoid Them
Almost 20 years of managing California rental properties has given our team a clear picture of where self-managing landlords run into trouble on rent increases. These six mistakes come up repeatedly.
Civil Code 827 measures from the lowest rent in the past 12 months, not the current rent. If you reduced rent for any period during the year, your threshold baseline is lower than you think. This error causes landlords to give 30-day notice when the law requires 90 days.
Giving insufficient notice does not just fail to enforce the increase. It can expose you to a tenant legal challenge and create an obligation to restart the entire notice process, pushing your effective date back by months.
Giving proper notice does not save you if the increase itself exceeds the annual cap on a covered property. A technically proper 90-day notice for a 15% increase on a covered building is still unlawful. The cap and the notice period are two separate requirements.
If your SFR or condo qualifies for the AB 1482 exemption, California law requires you to provide a written exemption notice to the tenant. This is typically included in new leases. Missing it is a procedural error that can complicate your compliance position.
A fixed-term lease locks the rent for the lease period. Without an explicit written provision in the lease allowing a mid-term increase, you cannot raise rent until the lease term ends, regardless of notice or market conditions.
AB 1482 evaluates all increases within a 12-month period together. A small increase in January and a second increase in July on the same covered property may together exceed the annual cap even though each one looked modest. Track cumulative increases, not individual ones.
How TrueDoor Handles Rent Increases for Owners
Kyle Thompson, TrueDoor’s co-founder, puts it plainly: “Property managers are becoming a much more needed service provider because of the complexity of navigating tenant relations and making sure that we stay in line with California laws.” Rent increases are one of the clearest examples of that complexity in practice.
When you work with TrueDoor, rent increases are not something you have to think about. We track the regulatory framework for every property in our portfolio across our Irvine, Huntington Beach, Redlands, and Murrieta offices. We monitor the annual CPI announcement for the relevant MSAs, calculate the maximum permissible increase for each covered property, prepare the written notice with the correct information and effective date, document delivery through both personal service and certified mail, and update property records.
We have been doing this in Orange County and the Inland Empire for almost 20 years, through multiple changes to state law including the passage of AB 1482, AB 1510, and local ordinance shifts in Santa Ana. Our clients come to us because they do not want to get these details wrong. The owners with almost a thousand reviews on our profile have trusted us to handle exactly this kind of ongoing compliance work.
Single-Family Rentals in OC and IE
We confirm exemption status, provide the required AB 1482 exemption notice, and manage all rent increase communications on your behalf. SFR owners often have one or two properties where a single error has outsized impact.
Multi-Family Buildings
For apartment buildings subject to AB 1482, we track the 12-month window for each unit, calculate cumulative increases, pull the current CPI figure each year, and coordinate notices across multiple units without conflicting effective dates.
TrueScreen Tenant Quality
Better tenants mean fewer disputes at rent increase time. Our TrueScreen screening process catches 30% more fraud and has contributed to 10% fewer evictions across our portfolio. Starting with a qualified tenant reduces friction throughout the tenancy.
TrueDoor also provides a 30-day placement guarantee. If we do not lease your property at market rent within 30 days, we waive the leasing fee. Our rent loss protection covers up to two months of lost rent. These guarantees exist because we are confident in our pricing analysis and our ability to attract and keep quality tenants at rents that make sense for the current market.
We manage the entire process from CPI calculation to notice delivery to records documentation. Owners with one property or a full portfolio trust TrueDoor to get this right. Call (714) 899-2200.
Notice Period Requirements Summary
The following table covers the primary scenarios you will encounter as a California landlord on a month-to-month tenancy. Use this as a reference alongside the calculations described above.
| Increase Amount (from lowest rent in 12 mo.) | Notice Period Required | AB 1482 Annual Cap Applies? | Best Practice Delivery Method |
|---|---|---|---|
| Up to 10% | 30 days | Yes, if property is covered | Personal delivery + certified mail same day |
| More than 10% | 90 days | Yes, if property is covered (an increase over the cap is unlawful regardless of notice) | Personal delivery + certified mail same day |
| Any amount on AB 1482-exempt SFR or condo | 30 or 90 days based on % (Civil Code 827 still applies) | No annual cap (exemption notice required) | Personal delivery + certified mail same day |
| Any amount under local rent control (e.g., Los Angeles RSO, Santa Ana) | 30 or 90 days based on % (whichever is more restrictive) | Local cap applies, which is often stricter than AB 1482 | Personal delivery + certified mail; check if local ordinance requires additional steps |
| Any amount during fixed-term lease (no mid-term clause) | Not applicable; increase cannot take effect during term | Lease term locks rent; AB 1482 and Civil Code 827 apply at renewal or month-to-month conversion | Raise rent at lease expiration or renewal only |
Frequently Asked Questions
How much notice do I need to raise rent in California on a month-to-month tenancy?
California Civil Code Section 827 requires 30 days written notice for rent increases of 10% or less and 90 days written notice for increases greater than 10%. Both thresholds are measured from the lowest rent charged in the preceding 12 months, not from the current rent. Notice must be in writing and is best served by personal delivery and certified mail on the same day.
What is the AB 1482 rent increase cap for 2025-2026 in California?
AB 1482 caps annual rent increases on covered properties at 5% plus the regional Consumer Price Index (CPI), or 10%, whichever is lower. The CPI figure varies by metropolitan statistical area and is announced annually by the California Department of Industrial Relations. For the Los Angeles-Long Beach-Anaheim MSA, recent CPI figures relevant to rent control purposes have been in the 3% to 4% range, resulting in a combined cap of roughly 8% to 9% for most Orange County properties on covered buildings. Always verify the current announced figure before calculating.
How do I calculate the 10% threshold for determining notice period in California?
Review the rent charged for every month during the 12 months preceding the proposed effective date of the increase. Find the lowest rent charged in that window. Divide the proposed new rent minus that lowest rent by the lowest rent. If the result is 10% or under, you need 30 days notice. If it is over 10%, you need 90 days notice. Do not measure from the current rent amount; measure from the lowest amount charged during the look-back period, including any temporary concessions.
Can I raise rent on a tenant in the middle of a fixed-term lease in California?
No. A fixed-term lease locks the rent for the duration of the term unless the lease contains an explicit written provision allowing a mid-term increase. Most standard California residential leases do not include such a clause. You must wait until the lease term expires, then offer a new lease or renewal at the adjusted rent, or allow the tenancy to convert to month-to-month and send the appropriate Civil Code 827 notice.
Do I have to give a reason for raising rent in California?
For most month-to-month tenancies governed by state law, you do not need to state a reason for a rent increase in the notice. The Civil Code 827 notice requirement is procedural, not substantive. However, certain cities with local rent control ordinances do require landlords to state an approved reason in the notice. Santa Ana is one example. Before you send any notice, confirm whether the city where the property is located has this additional requirement.
What if my city has stricter rent control than AB 1482 in California?
Local rent control ordinances take precedence over AB 1482 where they impose stricter limitations. In Los Angeles, the Rent Stabilization Ordinance (RSO) caps increases at 3% or CPI, whichever is lower, for covered pre-1978 buildings, which is stricter than the AB 1482 formula in many years. Santa Ana has its own local cap. If your property is in a city with a local ordinance, that ordinance governs, and you must comply with both the local cap and the Civil Code 827 notice requirements simultaneously.
How does TrueDoor Property Management handle rent increases for owners in California?
TrueDoor manages the entire rent increase process for property owners across Orange County and the Inland Empire. We confirm regulatory framework and coverage status for each property, pull the current annual CPI figure for the relevant MSA, calculate the maximum permissible increase within the annual cap, calculate the correct notice period based on the proposed increase, draft the written notice with all required information, serve notice by personal delivery and certified mail simultaneously, and update property records to document the transaction. Owners who prefer not to navigate these details directly call us at (714) 899-2200.
Rent Increase Quick-Reference Cheat Sheet
| Scenario | Key Rule | Action |
|---|---|---|
| Increase 10% or under from 12-month low | Civil Code 827 | 30-day written notice required |
| Increase over 10% from 12-month low | Civil Code 827 | 90-day written notice required |
| Property covered by AB 1482 | Tenant Protection Act 2019 | Annual cap: 5% + CPI or 10%, lower prevails |
| SFR or condo (individual owner) exempt from AB 1482 | AB 1482 exemption + Civil Code 1947.12 | Provide written exemption notice; Civil Code 827 notice still required |
| Property in city with local rent control (e.g., Santa Ana, L.A. RSO) | Local ordinance | Follow the stricter local cap; Civil Code 827 notice minimums still apply |
| Fixed-term lease without mid-term increase clause | Lease contract law | Cannot raise rent until lease expires or renewed |
| Two increases in one 12-month period on covered property | AB 1482 cumulative tracking | Both increases count together toward the annual cap |
| 10% threshold baseline calculation | Civil Code 827 | Measure from lowest rent in preceding 12 months, not current rent |
| Notice delivery method | Best practice | Personal delivery + certified mail on the same day; keep certified mail receipt |
| Effective date calculation | Civil Code 827 | Count days from delivery date, not preparation or mail date |
TrueDoor Property Management handles rent increases for property owners across Irvine, Huntington Beach, Redlands, and Murrieta. Our Happiness Guarantee means no long-term contracts. Call (714) 899-2200 to get started.
