Across San Diego County, from Chula Vista to Vista, the housing market is tighter than ever. Because of this, many property owners have turned to "creative" housing solutions, converting garages, basements, or sheds into living spaces. While these units provide a roof over someone’s head, they often fall into a legal gray area: or outright illegality.
If you are a landlord renting out one of these spaces, or a tenant living in one, you might be wondering about the legal standing of your lease. Specifically, can a landlord actually collect rent on an illegal unit in California?
The short answer is no. But the implications for both parties are far-reaching, involving "void contracts," potential rent refunds, and significant relocation costs. At the Law Office of Andrew H. Griffin, III, APC, we have spent over 40 years helping San Diego residents navigate these complex real estate and eviction issues. Whether you are trying to legalize a unit or recover rent you shouldn't have paid, understanding the law is your first step.
What exactly counts as an "illegal unit" in your area?
Before we dive into the financial consequences, you need to know if the unit in question is actually considered "illegal." In California, an illegal unit (sometimes called a "bootleg" or "unpermitted" unit) is any residential space that was built, converted, or occupied without the necessary building permits and certificates of occupancy from the local municipality.
Common examples we see in San Diego include:
- Garage Conversions: Transforming a parking garage into a studio apartment without updating the property's permit status.
- Bootleg Basements: Lower-level spaces turned into rentals that lack proper ventilation, emergency exits (egress windows), or ceiling height required by code.
- Unpermitted Accessory Dwelling Units (ADUs): A "granny flat" or backyard cottage built without following the specific California ADU guidelines.
- Subdivided Houses: Large single-family homes split into multiple apartments without the city’s approval for a multi-family dwelling.
If the city has not inspected the unit and issued a Certificate of Occupancy, the unit is legally "non-existent" for residential purposes. This means that, in the eyes of the law, the space cannot be rented out for someone to live in.
The hard truth for landlords: Why your lease might be a "void contract"
You might have a signed, written lease agreement. You might have a tenant who agreed to the price. However, under California Civil Code §1550, a contract must have a "lawful object" to be valid.
Because it is illegal to rent out a unit that does not meet health, safety, and building codes, the "object" of the rental contract (the illegal unit) is unlawful. Therefore, the lease is considered a void contract.
In reality, this means the contract never legally existed. Because a void contract has no legal standing, a landlord cannot use the court system to enforce its terms. This has several major consequences:
- No Right to Collect Rent: You cannot legally demand or accept rent for an illegal unit.
- No Unlawful Detainer for Non-Payment: If a tenant stops paying rent for an illegal unit, you cannot successfully sue for "non-payment of rent" because there was never a legal obligation to pay it.
- Potential for Lawsuits: Tenants can sue to recover every dollar of rent they have ever paid you for that unit.
If you find yourself in this position, you need an experienced eviction attorney in San Diego who understands both the legal and real estate brokerage side of the business to help you navigate a way out without facing catastrophic financial loss.
Notes for Business Owners
For property management companies or investors holding multiple properties, the risks are magnified. Renting out unpermitted units can be seen as a violation of business and professions codes. If a fire or injury occurs in an unpermitted unit, your commercial insurance policy may deny coverage, leaving your business assets completely exposed to personal injury lawsuits. Legalizing these units should be a top priority for your risk management strategy.
Tenants' rights: Can you get a "rent clawback"?
If you are a tenant and discover that your home is an illegal unit, you may feel like you’ve been taken advantage of. The law is largely on your side in this situation. Because the landlord was never legally allowed to collect rent, you may be entitled to a "rent clawback."
A rent clawback is a legal action where a tenant sues to have their past rent payments returned. Since the lease was void from the start, the landlord was "unjustly enriched" by your payments. In many California jurisdictions, including parts of San Diego County, courts have ordered landlords to refund months or even years of rent.
Beyond the refund of rent, you may also have grounds for:
- Damages for Breach of Warranty of Habitability: Illegal units often have code violations (like poor wiring or lack of heat) that make them unsafe.
- Statutory Penalties: If the landlord tried to evict you or harass you for complaining about the unit’s status.
- Return of Security Deposit: The landlord must return your security deposit in full, as they had no legal right to hold it under a void contract.
Relocation assistance: What happens when you have to move?
When the city discovers an illegal unit, they will often issue a "Notice to Vacate" or an "Order to Abate." This means you must move out: often on very short notice: because the unit is deemed unsafe.
In San Diego, you aren't just left on the street. Under local and state guidelines, landlords who are forced to evict tenants because the unit is illegal are often required to pay mandatory relocation assistance. This fee is designed to help the tenant find a new, legal place to live.
Relocation fees can range from two to three times the monthly rent or a flat fee set by the city (sometimes exceeding $5,000–$10,000 depending on the tenant's age, disability status, or length of residency). If you are facing a sudden move due to an unpermitted unit, you should contact a san diego eviction attorney immediately to ensure you receive the full relocation benefits you are entitled to.
The 2026 Update: SB 543 and the "Amnesty Pathway"
There is a light at the end of the tunnel for landlords who want to do the right thing. The SB 543 (California ADU Clarity and Consistency Act), which takes full effect in 2026, provides a critical pathway for owners of unpermitted units.
One of the most important aspects of this update is the "amnesty" or consistency provision for units built before 2020. Recognizing the housing crisis, the state is encouraging local governments to provide a way for owners to permit existing "bootleg" units without facing the massive penalties or demolition orders that were common in the past.
If your unit was built before 2020, SB 543 and related ADU laws may allow you to:
- Legalize the unit by meeting basic health and safety standards rather than modern, often impossible, building codes.
- Avoid development impact fees for smaller units.
- Consistency in Permitting: Prevents local cities from being unnecessarily "picky" or obstructive if the unit meets state safety minimums.
Legalizing your unit is the only way to transform it from a legal liability into a legitimate, income-generating asset. Our firm’s unique advantage: having a California-licensed real estate broker at the helm: means we can help you understand the permitting process from a developer’s perspective while protecting your rights as an attorney.
Why the Law Office of Andrew H. Griffin, III, APC is the right choice
Dealing with an unpermitted ADU rent dispute or a potential eviction is incredibly stressful. You need more than just a lawyer; you need a guide who understands the San Diego real estate landscape inside and out.
Since 1983, the Law Office of Andrew H. Griffin, III, APC has been a fixture in the San Diego legal community. Our dual expertise in law and real estate brokerage allows us to see the "big picture" that other firms might miss. We aren't just looking at the court case; we are looking at your property value, your investment goals, and your future.
We offer our clients:
- 40+ Years of Experience: We’ve seen every variation of the "illegal unit" scenario.
- Bilingual Services: We are proud to serve our Spanish-speaking community (Se Habla Español).
- 24/7 Accessibility: Legal emergencies don't just happen during business hours. You can reach us or text us whenever you need guidance.
- A Balanced Approach: We help landlords legalize and protect their investments, and we help tenants secure the relocation and refunds they deserve.
You don't have to face this alone
Whether you are a landlord worried about a "void contract" or a tenant living in a garage conversion that you just found out is illegal, the clock is ticking. The sooner you understand your rights and obligations, the better your outcome will be.
Don't wait for a city inspector to knock on your door or for a lawsuit to be served. Take control of the situation today.
Contact the Law Office of Andrew H. Griffin, III, APC for a consultation. We are here to help you navigate the complexities of California real estate law and find a resolution that works for you.
Call us today at 619 853-3009 or visit our contact page at https://www.andrewgriffinlawoffice.com/contact/ to schedule your consultation.