California's seller disclosure regime is already one of the most demanding in the country, and it grew again this year. Assembly Bill 455 took effect on January 1, 2026, and it added two new subjects to what sellers of residential one to four unit property have to disclose: indoor tobacco and nicotine use history, and known requirements to replace gas-powered appliances. The forms have been revised to capture both.
If you have read my piece on what goes into a California disclosure package, the philosophy here is the same and I will restate it plainly. Disclosure is not a confession you are trying to minimize. It is the mechanism that makes your sale final. This is general information rather than legal advice, and your agent and a real estate attorney should be the ones applying it to your transaction.
The tobacco and nicotine question
The first change asks sellers to disclose, to the extent of their actual knowledge, whether anyone living at the property was a regular indoor user of tobacco or nicotine products. That includes cigarettes, cigars, and pipes, and it also includes electronic nicotine delivery systems, so vaping counts. The disclosure also reaches whether you are aware of any testing showing elevated nicotine or tobacco-related compounds in the property, and whether any remediation was done for that kind of contamination.
The concept underneath this is what researchers call third-hand smoke: the residue that settles into drywall, carpet, padding, ductwork, and window coverings over years of indoor smoking and does not simply air out. It is a real phenomenon and it is expensive to remediate properly, which is why the legislature moved it from the category of things a buyer might discover to the category of things a seller has to state.
Sellers ask me whether this will cost them the sale. In my experience the honest answer is that it can affect price at the margin, and that hiding it costs far more. Nicotine residue is not a subtle defect. Buyers smell it during the first showing, inspectors note it, and a buyer who discovers a history you did not disclose after closing has a straightforward complaint against you. The strategic move is not silence. It is to deal with the condition before you list, keep the invoices, and disclose both the history and the remediation. A documented professional remediation reads completely differently to a buyer than a disclosed problem with nothing done about it.
A disclosed condition you have already fixed is a footnote. An undisclosed condition the buyer finds later is a lawsuit.
The gas appliance question
The second change is less discussed and, for Bay Area sellers, may matter more often. Sellers now have to disclose the existence of any state or local requirement relating to the replacement of existing gas-powered appliances that are transferring with the property, where either the seller or the agent is aware of it.
This one exists because California cities and air districts have been steadily adopting rules that affect gas water heaters, furnaces, and other combustion appliances, often at the moment of replacement or at certain trigger points rather than immediately. The rules vary enormously by jurisdiction, and they change. A buyer who assumes they can swap a failed gas water heater for an identical gas water heater, and then discovers their city requires an electric replacement with the electrical work that implies, has been handed a real and unbudgeted cost.
Practically, this means you should know what applies where your home sits before you fill out the form. Your city or county building department is the authority, and the regional air district may have its own rules. Do not guess, and do not assume the rule in the next town over is the rule in yours. If a requirement exists and you or your agent know about it, it goes on the form.
How to answer both of these well
The standard on most of the disclosure forms is your actual knowledge. You are not being asked to run tests you have never run or to become an expert on your own house. You are being asked to tell the truth about what you know. That cuts both ways: you cannot disclose your way out of a defect you concealed, and you also do not need to speculate about things you have no knowledge of.
A few habits that make this go smoothly:
- Answer from knowledge, not from hope. If a previous resident smoked indoors for a decade and you know it, that is knowledge, even if you personally never smoked.
- Write it down rather than saying it. Verbal disclosure to a buyer's agent is not the same as a disclosure on the form, and the form is the record that protects you.
- Keep the paperwork. Remediation invoices, permits, and appliance receipts turn a disclosure from an alarming sentence into a documented and closed issue.
- Ask the building department, not the internet, about local appliance replacement rules. These are municipal and they change.
- When you are unsure whether something rises to the level of disclosable, disclose it. Over-disclosing has never cost one of my sellers a deal. Under-disclosing is how sellers end up in litigation after they have spent the proceeds.
The wider point is that the disclosure package is not the last step before closing. It is a step you should be preparing for before you list, at the same time you are deciding on repairs and pricing, because what you find while filling it out often changes what you should fix first. That sequencing is a large part of what a pre-listing strategy review is for, and it pairs naturally with the question of whether to pre-inspect before you list.
If you are planning a sale this year and want to know what these forms will ask of your specific home, and what it is realistically worth once you account for its actual condition, start with a home value estimate and a look at your net proceeds, then reach out and we will go through it together.
Thinking about selling? Request a pre-listing strategy review.