Selling a California House With Unpermitted Work: What You Must Disclose

Bynimitz24
Residential garage on a single family home, a common site of unpermitted conversions

You can sell a California house with unpermitted work. What you cannot do is stay quiet about it: the state’s mandatory Transfer Disclosure Statement asks about unpermitted alterations by name, in three separate line items, and Civil Code section 1102(c) makes any waiver of the disclosure requirements void as against public policy.

The Form Asks About This Specifically

The Real Estate Transfer Disclosure Statement, required by Civil Code section 1102 and following for most transfers of residential property of one to four dwelling units, contains a section headed “Are you (Seller) aware of any of the following.” Three of those items are relevant here:

  • Item 4: “Room additions, structural modifications, or other alterations or repairs made without necessary permits”
  • Item 5: “Room additions, structural modifications, or other alterations or repairs not in compliance with building codes”
  • Item 10: “Any zoning violations, nonconforming uses, violations of ‘setback’ requirements”

Item 10 is the one sellers overlook. A converted garage or a bootleg second unit is usually both a building-permit problem and a zoning problem, and resolving the permit without addressing the nonconforming use leaves half the disclosure obligation unanswered.

Failing to deliver the disclosure does not unwind the sale — Civil Code section 1102.13 says no transfer is invalidated solely for non-compliance. It says something more useful to the buyer: anyone who willfully or negligently violates the article is liable for the buyer’s actual damages. Negligently. “I didn’t really think about it” is not a defense.

One practical note on timing: if the disclosure is delivered after the offer is signed, section 1102.3 gives the buyer three days to terminate after personal delivery, five days after delivery by mail, and five days after delivery of an electronic record. Since nearly every California transaction now delivers disclosures electronically, the real-world answer is five days, not three.

“As-Is” Does Not Erase the Duty

Civil Code section 1102.1(a) states the Legislature’s intent directly: the disclosure statement cannot be waived in an as-is sale. The case law behind it is older and clearer. Lingsch v. Savage (1963) 213 Cal.App.2d 729 held that where the seller knows facts materially affecting the value or desirability of the property that are known or accessible only to him, and knows they are not within the reach of the buyer’s diligent attention and observation, the seller has a duty to disclose them.

On as-is clauses specifically, the court said such a provision means the buyer takes the property in the condition visible to or observable by him, and is ineffective to relieve a seller who fails to disclose true facts of the property’s condition not within the buyer’s reach. The court’s own illustration is worth quoting: an as-is provision “may therefore be effective as to a dilapidated stairway but not as to a missing structural member, a subterranean creek in the backyard or an unexploded bomb buried in the basement, all being known to the seller.”

Unpermitted work is the textbook example of a fact outside the buyer’s reach. It is invisible on a walkthrough and discoverable only in municipal records most buyers never pull. As-is allocates who pays to fix known, visible defects. It does not license concealment.

If You Are Selling as an Executor or Trustee

Civil Code section 1102.2 exempts several categories from the disclosure article, and heirs land in the middle of them. Subdivision (b) exempts sales pursuant to court order, including sales ordered by a probate court in the administration of an estate. Subdivision (c) exempts foreclosure sales. Subdivision (d) exempts sales by a fiduciary in the course of administering a trust, guardianship, conservatorship or decedent’s estate.

Read the rest of subdivision (d) before you rely on it. The exemption does not apply if the trustee is a natural person who is a trustee of a revocable trust and is a former owner of the property, or was an occupant in possession of the property within the preceding year. That describes an enormous share of real situations: an adult child who is now successor trustee of a parent’s revocable living trust and who lived in the house. The exemption evaporates and the TDS is required.

And even where the exemption does apply, it is an exemption from this article only. It is not an exemption from the common-law duty in Lingsch. An exempt seller who knows about the illegal unit and conceals it can still be sued for fraud. “Probate sales are exempt, so I don’t have to say anything” is the most expensive wrong conclusion on this page.

Age Does Not Legalize It

“It was done in the eighties, it’s grandfathered” is the most common misconception in this area and it is wrong. Legal nonconforming status requires that the work was lawful when built. Unpermitted work never was.

There is no California statute of limitations barring a city from enforcing against unpermitted construction. Health and Safety Code section 17980 requires an enforcement agency to give 30 days’ notice to abate before acting, but imposes no outer deadline on when it may act. Section 17920.3(n) makes a building substandard where portions occupied for living, sleeping, cooking or dining purposes “were not designed or intended to be used for those occupancies” — which describes a converted garage or enclosed patio indefinitely, regardless of how long ago it happened. And Civil Code section 3490 provides that no lapse of time can legalize a public nuisance amounting to an actual obstruction of a public right.

You will sometimes see Code of Civil Procedure section 337.15, the ten-year construction repose statute, offered as a shield. It is not one. It bars damages actions against builders, designers and surveyors; it expressly excludes any person in actual possession or control as owner; and it does not apply to actions based on willful misconduct or fraudulent concealment — which is the exact theory a buyer will plead against a seller who hid an illegal unit.

If the Space Is an ADU, the Law Is on Your Side

This is the single most useful development in this area and it appears in essentially none of the national guidance. Government Code section 66332, added by AB 2533 and effective January 1, 2025, provides that a local agency shall not deny a permit for an unpermitted accessory dwelling unit or junior ADU constructed before January 1, 2020, on the grounds that it violates building standards or does not comply with state ADU law or a local ADU ordinance.

The agency may still deny where it finds correcting the violation is necessary to protect the health and safety of the public or the occupants, or where the building is substandard under Health and Safety Code section 17920.3. But the default flipped from discretionary to mandatory approval.

The state’s ADU Handbook adds a step worth taking before anything else: under AB 2533, local agencies must publish a checklist of the section 17920.3 substandard conditions and must inform owners that they may obtain a confidential third-party code inspection from a licensed contractor before applying. That lets you find out exactly what you are facing without opening a code case against yourself.

There is a separate and narrower provision, Health and Safety Code section 17980.12, allowing an owner of a qualifying pre-2020 ADU to apply for a five-year delay in enforcement where correcting the violation is not necessary to protect health and safety. Understand what it is: a deferral, not forgiveness. The violation persists and the obligation returns. And a granted delay is itself documentary proof you knew about the violation — precisely what TDS items 4, 5 and 10 ask you to disclose.

Los Angeles Has Two Different Programs

Route your situation to the right one, because they are not interchangeable.

  • Unpermitted ADU or JADU on a single-family lot: LADBS Information Bulletin IB-P-BC-2026-161, the streamlined AB 2533 permitting process. It requires the unit to have been constructed before January 1, 2020, evidence of the build date such as utility bills, contractor receipts or lease agreements, a site plan, and inspection against the department’s AB2533-01 checklist covering smoke and CO detectors, egress windows, plumbing, electrical, structural integrity and fire-resistance ratings.
  • Unpermitted unit in an R2 or higher multifamily building: the city’s Unpermitted Dwelling Unit Ordinance, No. 184,907. It does not apply to single-family homes, the unit must have existed between 2010 and December 10, 2015, and legalization requires covenanting at least one restricted affordable unit for up to 55 years. For an owner trying to sell, that covenant is usually a deal-breaker and needs to be priced before you start.
  • Everything else — an enclosed patio, a bootleg addition, a garage conversion that is not an ADU: an ordinary retroactive building permit, with no statutory protection against denial and current-code compliance required.

One term to ignore: a “Certificate of Compliance” in California is a Subdivision Map Act instrument certifying the legality of a parcel. It has nothing to do with legalizing an unpermitted structure, and guidance telling you to request one is sending you to the wrong counter.

The Property Tax Question Cuts Both Ways

Yes, legalizing unpermitted square footage triggers a reassessment. Revenue and Taxation Code section 70 defines newly constructed property to include any addition to improvements since the last lien date, and any alteration constituting a major rehabilitation or converting the property to a different use.

But the exposure exists either way. The Board of Equalization states plainly that the county assessor is required by law to value all new construction even if a building permit has not been issued, and that assessors locate new construction through permits, aerial photographs and satellite imagery, and field inspections. Permitting converts a latent, backward-looking liability into a known, forward-looking one.

Two things soften it. Only the new construction is reappraised — the assessed value of the existing land and improvements is not affected, so your Proposition 13 basis on the original house is preserved. And the increase is on the added value only, not the property as a whole.

Permit First, or Sell As-Is?

Permitting first is usually right when the structure is a pre-2020 ADU, because section 66332 means the agency cannot simply refuse you; when a confidential pre-inspection comes back clean; when the work is cosmetically sound and the paperwork is the only gap; and when you have the months and the cash to see it through. A legalized unit adds real, financeable square footage.

Selling as-is is usually right when the pre-inspection reveals section 17920.3 substandard conditions, when legalization would require demolition and rebuilding, when the only path is the UDU ordinance’s 55-year affordability covenant, or when you are on a timeline that will not survive a permit process.

Be clear about what an as-is cash sale does and does not solve. It solves the repair problem and the financing problem — a lender’s appraiser will note unpermitted additions and comment on their effect on value, and individual lender overlays kill more of these deals than agency guidelines do. It does not solve the disclosure problem. You still complete the TDS honestly, and the buyer’s willingness to take the risk is reflected in the price rather than in your silence. Anyone offering to buy on the understanding that nothing needs to be disclosed is not a buyer you want.

For the broader picture, see selling as-is without making repairs in California and the objections sellers actually raise about as-is sales. If the property also carries recorded debt, selling with a lien on title covers that side.

This is general information rather than legal advice, and permitting rules vary by jurisdiction and change often. Confirm your city’s current requirements and talk to a California real estate attorney before deciding. If you want a no-obligation cash offer on a property with unpermitted work, Cash Home Buyers CA can provide one.