AB 455: What San Diego Sellers Must Disclose About Smoking

If you know someone smoked or vaped inside your house, California now requires you to say so in writing when you sell it. That is AB 455, the first law of its kind in the country, and it has applied to single-family home sales since January 1, 2026. The part that catches sellers off guard: repainting does not erase the obligation, and neither does the fact that it was the previous owner who smoked.

We are now in the first full fall selling season under this law, and I am still meeting sellers who have never heard of it. That is a problem worth ten minutes of your time, because disclosure is the cheapest thing on your entire transaction to get right and one of the most expensive to get wrong.

Who this is for

San Diego owners listing a single-family home this fall or winter, especially anyone who bought a property where someone smoked, anyone who has rented their house out and does not know exactly what tenants did indoors, and anyone who has quietly assumed that a fresh coat of paint closed the subject.

If you own rental property and you are selling it, pay particular attention. You may have less direct knowledge of what happened inside than an owner-occupant would, and that changes how you should approach the question rather than excusing you from it.

What AB 455 actually requires

The standard is actual knowledge. If you know that tobacco or nicotine residue is present on the property, or you know there is a history of smoking or vaping inside it, you disclose that in writing to prospective buyers.

A few things that surprise people:

• Vaping counts. The law reaches electronic nicotine delivery systems, not just cigarettes. Cigars and pipes are in as well.
• It is about residue and history, not odor. A house that no longer smells of smoke can still have a history you know about.
• Prior owners and tenants count if you know about it. The obligation attaches to your knowledge, not to your own habits.

You can read the bill yourself at the California Legislature’s site. It is short.

What it does not require

This is where I spend most of my time with sellers, because the anxiety usually runs well ahead of the actual rule.

Situation	Does it trigger disclosure?
You smoked indoors for years	Yes. You have actual knowledge.
Previous owner smoked indoors and you know it	Yes. Your knowledge is what matters.
A tenant vaped indoors and you were told	Yes.
Household smoked outside on the patio only	Generally no. The law reaches smoking inside the property.
You genuinely have no idea either way	No duty to guess. Also no license to avoid finding out what you do know.
You repainted and replaced carpet	Yes, still disclose. Remediation is not erasure of the history.

Note also what is absent from that list: there is no testing requirement. AB 455 does not order you to hire anyone, sample any surface, or produce a lab result. Anyone telling you that you must buy a thirdhand smoke inspection to list your house is selling you something the statute does not ask for.

The repaint myth is the expensive one

Here is the pattern I expect to see play out over the next year or two. A seller does a beautiful job remediating: seals the walls, replaces the carpet and pad, cleans the ducts, swaps out the blinds. The house presents perfectly. And because it presents perfectly, they conclude there is nothing left to disclose.

Then the buyer moves in, gets a warm week with the windows closed, notices something, and starts asking the neighbors. Neighbors remember. Now a seller who spent real money doing the right thing physically is defending a nondisclosure claim, which is a far worse position than the one they would have been in had they simply written it down and attached the remediation invoices.

That is the whole lesson. Disclosure and remediation are not substitutes for each other. Done together they are a selling point: here is what happened, here is exactly what I did about it, here are the receipts. Done as a substitution, the remediation becomes evidence that you knew.

What I would do before listing

• Write down what you actually know, including what you were told by tenants, prior owners, or your own agent at purchase. Your old disclosure packet from when you bought is worth rereading.
• Keep any remediation paperwork. Invoices for sealing, duct cleaning, carpet replacement. These turn a liability into a documented fix.
• Do not editorialize. Disclosure is a factual statement, not an argument about whether it matters. Sellers who argue in the disclosure make buyers suspicious.
• Ask your agent how they are handling the form this season. Standard forms were updated for this, and practice is still settling.
• If the answer is genuinely complicated, talk to a real estate attorney before you list rather than after you are in escrow.

Why this matters more in a slower market

Disclosure problems surface at the worst possible moment, and the moment gets worse as the market softens. With inventory running near 6,400 active listings and roughly 3.2 months of supply, buyers have options and a reason to use them. A buyer in a hot market with three backup offers behind them tends to absorb a surprise. A buyer in this market renegotiates, or simply leaves and picks one of the other houses.

A disclosure you make up front is a fact the buyer priced in. The same disclosure made in week three of escrow is leverage you handed them.

Frequently asked questions

Does this apply if I am selling a condo or a duplex?

The requirement was written for residential sales of single-family property. If you are selling something other than a standard single-family home, confirm how it applies to your specific transaction before you assume it does not.

What if I bought the house recently and the seller disclosed smoking to me?

Then you have actual knowledge and you disclose it. Being the second owner in the chain does not reset the clock.

Will disclosing hurt my price?

Less than you think, and far less than a claim after closing. Buyers discount uncertainty more aggressively than they discount a known, documented, remediated condition.

What if I disclose and the buyer asks for a credit?

That is a negotiation, and it is a normal one. It is also a negotiation you are having from a position of good faith with the deal still intact, which is the entire point.

Where this fits

AB 455 is one line item in a much longer California disclosure obligation. If you have not been through it before, start with what California sellers are required to disclose, which covers the full picture. For the other disclosure question sellers ask me most, see the three-year rule on disclosing a death in the house. And if the condition of the property is the real issue, selling as-is does not remove the duty to disclose, which is the single most common misunderstanding I run into.

If you are weighing a fall or winter listing and want a straight read on what your house is worth in this market and what needs handling before it goes live, book an appointment and we will walk the property together.

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Amara Berg helps San Diego owners sell well and manage well through Big Returns, Inc. More at Big-Returns.com.

Amara Berg, CA DRE #01961620. This article is general education about a California disclosure requirement and is not legal advice. Disclosure obligations depend on the specific facts of your property and transaction, and the law and the standard forms continue to evolve. Consult a qualified California real estate attorney about your situation before relying on anything here.