Selling a Home With Unpermitted Work in California: Disclosure, Risk, and Your Options

Quick Answer

Selling a home with unpermitted work in California is legal, and it happens in every price band. Disclosure is not optional. The state transfer disclosure form asks, in plain words, about room additions, structural changes, or other work done without necessary permits. A seller who knows the answer must give it.

Disclosure, permitting, lending, and assessment rules verified as of July 28, 2026. Analysis by Michael Mellgren, REALTOR® (DRE #02321556).

Do you have to disclose unpermitted work when selling a house in California?

Yes, and the form names unpermitted work directly. Civil Code section 1102.6 sets out the Real Estate Transfer Disclosure Statement, the main disclosure form in a California home sale.

Section C asks two separate questions. One covers work done without necessary permits. The other covers work that breaks building codes.

The duty tracks what the seller actually knows. So a seller who added a bedroom over a patio slab in 2009 without a permit answers yes. Age, quality, and a prior sale change nothing.

Skipping the disclosure carries a price. Under Civil Code section 1102.13, a seller who willfully or negligently skips a disclosure duty owes the buyer actual damages. That exposure sits with the seller, and it outlives the closing.

Does an “as is” sale remove the duty?

No. Civil Code section 1102.1(a) speaks to this point. A seller cannot waive the transfer disclosure form in an as-is sale, per Loughrin v. Superior Court (1993) 15 Cal.App.4th 1188.

That section also leaves an agent’s duty under Civil Code section 2079 in place. Both duties run at once.

Think of it this way. An as-is clause tells the buyer not to expect repairs. It does not tell the seller to stop talking.

What if the seller does not know whether anyone pulled a permit?

Say so, then go find out. Permit history is a public record. The city or county that issued the permit holds the file. Most building departments will pull it on request.

The form asks what the seller is aware of. An honest “unknown” is therefore a legitimate answer. A confident “permitted” that later proves wrong is not.

What happens if the work turns up mid-escrow?

A late disclosure restarts a clock for the buyer. Under Civil Code section 1102.3, where a required disclosure or a material amendment to one arrives after the buyer executed the offer, the buyer may terminate by written notice within three days of personal delivery, or five days of delivery by mail or electronic record.

So amending the form on day 20 of a 30-day escrow hands the buyer a fresh exit. So sort out permit history before the listing goes live. The same fact then shapes an offer up front, rather than unwinding one later.

Does unpermitted work become legal after four years?

No. Nothing in California law turns unpermitted construction into permitted construction over time. The four-year and ten-year figures that circulate online come from two statutes that do something else.

Code of Civil Procedure section 337.1 blocks a claim against a designer or builder four years after the work is done. It covers a patent flaw, one you could spot on a reasonable inspection. Section 337.15 sets a ten-year outside limit for a latent flaw, one you could not. By its own terms, section 337.15 does not reach fraud or willful misconduct.

Both statutes aim at the people who designed and built the work. Neither one limits the building department. That distinction is the whole ballgame, and most online summaries skip it.

One further detail rarely surfaces. Section 337.1(d) bars that four-year defense for anyone in actual possession or control of the work, as owner or tenant, when the flaw causes the harm. So the current owner gets no shield. The original builder does.

A related mix-up is worth clearing up. A permitted structure that no longer meets a later code is legal nonconforming, and it keeps that status. Unpermitted work never entered that status, so time has nothing to preserve.

What each authority actually controls

The question	What controls the answer	Authority
Must the seller disclose it?	Yes, in writing, on the transfer disclosure statement	Civil Code section 1102.6
Does an as-is sale remove the duty?	No; a seller cannot waive the disclosure statement in an as-is sale	Civil Code section 1102.1(a)
What is owed if the seller skips it?	Actual damages, for a willful or negligent violation	Civil Code section 1102.13
Does age make the work legal?	No; those clocks limit suits against the builder, not city enforcement	Code of Civil Procedure sections 337.1 and 337.15
When is a condition substandard?	When a listed condition endangers occupants, nearby residents, or the public	Health and Safety Code section 17920.3
Can a city refuse to legalize an older ADU?	Not for code or ordinance noncompliance alone, if built before January 1, 2020	Government Code section 66311.7, formerly section 66332
Will a conventional lender still finance it?	Usually, once the appraiser comments on the work and its effect on value	Fannie Mae Selling Guide B4-1.3-05
Does skipping the permit avoid reassessment?	No; the assessor values the new portion either way	Revenue and Taxation Code sections 71 and 72

How California law treats unpermitted work on a home sale, verified July 2026. Source: California Civil Code, Code of Civil Procedure, Health and Safety Code, Government Code, Revenue and Taxation Code, and the Fannie Mae Selling Guide section on additions without permits; analysis by Michael Mellgren, REALTOR®.

What are the options for selling a home with unpermitted work?

Five paths cover almost every situation. The right one turns on the size of the work, its quality, and the seller’s timeline. Each path is lawful. So this is a business call, not a legal bind.

1. Permit it before listing. The city reviews the work and inspects it. That often means opening walls so an inspector can see wiring, framing, and plumbing.
2. Disclose it and sell as is. This fits sound work and a buyer pool that accepts it, with the price set to match.
3. Legalize it under the ADU rules, if the space is an ADU or junior ADU built before January 1, 2020.
4. Remove it and restore the original condition. That is often the answer for a small, poorly built addition.
5. Negotiate a credit or an escrow holdback so the buyer finishes the permitting after closing, on terms both sides sign.

One honest counterweight belongs here. A retroactive permit application invites the city to look at the whole property. A city can also make the work meet today’s code, not the code in force the year it went up.

So a seller weighing option one should move slowly. Get a licensed contractor to scope the risk first. Then ask the city how it handles legalization, before filing anything.

The amnesty for unpermitted ADUs built before January 1, 2020

California bars a city from denying a permit to legalize an unpermitted accessory dwelling unit, or ADU, built before January 1, 2020. That bar applies where the only grounds are a building standards violation or a clash with the local ADU rules. Junior ADUs get the same shield. Assembly Bill 2533 (Chapter 834, Statutes of 2024) moved the cutoff from 2018 to 2020, as of January 1, 2025.

The section number changed lately, which trips up much of the coverage online. The rule used to sit at Government Code section 66332. Senate Bill 543 (Chapter 520, Statutes of 2025) moved it to section 66311.7. The state Department of Housing and Community Development logged that change in its March 2026 ADU handbook.

The protection is broad, but it has limits. A city may still deny the permit if it finds a fix is needed to protect the health and safety of the public or the occupants. The shield also stops at a building deemed substandard under Health and Safety Code section 17920.3.

That statute sets the bar. A building is substandard when a listed condition endangers occupants, neighbors, or the public. Bad sanitation, faulty wiring, and structural hazard all sit on the list.

Three features matter most to a seller. First, an owner legalizing a pre-2020 unit owes no impact fees and no connection or capacity charges. The one exception is utility work needed to satisfy section 17920.3.

Second, a city inspector may look at the unit and advise on health and safety standards. Third, the city may not penalize the owner for having the unit. It must also issue the permits needed to fix what it finds.

Note the limit, because it is easy to overread. This amnesty covers ADUs and junior ADUs only. An unpermitted bathroom, a patio cover, or a bedroom addition gets nothing from it. Nor does a converted garage that is not a separate dwelling.

Going forward, local rules still govern what a new unit may look like. In this area that means codes such as the Orange ADU rules.

How lenders and appraisers handle unpermitted additions

An unpermitted addition rarely kills a conventional loan on its own. Under the Fannie Mae Selling Guide section on additions without permits, an appraiser who spots an addition without the required permit must comment on the quality and appearance of the work. The appraiser must also state its impact, if any, on market value. Nothing rules the home out, and no rule says the space is worth zero.

The stricter case is an ADU that zoning does not allow at all. Fannie Mae accepts that property under five conditions:

• The lender confirms the unit will not threaten a future property insurance claim.
• Its use fits the neighborhood and the market.
• An appraiser values the home on its current use.
• The report states that the work does not comply with zoning.
• That same report shows the work is typical for the market, using at least two comparable sales with the same zoning problem, within at least three settled sales.

Sellers most often miss that first condition. A carrier can argue that it never priced the added space. So get the policy’s treatment of it in writing. Do not assume coverage follows the square footage.

The 18-month rule for a recently purchased home

A seller who accepts an offer within 18 months of taking title carries an extra disclosure duty. Civil Code section 1102.6h, added by Assembly Bill 968 (Chapter 95, Statutes of 2023), covers single-family sales. It applies where the seller accepts an offer on or after July 1, 2024, and it aims at quick resales.

The seller must disclose any room additions, structural changes, or other work done since taking title, where a hired contractor did it. The seller must also name each such contractor and give contact details. That naming duty starts once the total contract price for labor, material, and all other items passes the threshold in Business and Professions Code section 7027.2. Assembly Bill 2622 (Chapter 240, Statutes of 2024) set it at $1,000, as of January 1, 2025.

Permits ride along with the duty. A seller who got a permit for the disclosed work must give the buyer a copy. Where a third party pulled the permit and never handed one over, the seller may instead point the buyer to that third party and supply the contact details.

Who performed the work matters

The owner-builder exemption is narrower than most owners assume. Section 7044 of the same code lets an owner improve their own property without a contractor license. That exemption holds only if the work is not intended or offered for sale. A pending listing collides with the clause.

Section 7044(b)(1) sets the trap. If an owner-builder sells or offers a structure within one year after it is done, the law presumes the work was for sale. That presumption is rebuttable, though at five or more structures in one year, section 7044(b)(2) makes it conclusive.

So a permit finaled under an owner-builder declaration weeks before listing is worth raising with counsel. It is a fact a buyer’s agent may well notice.

Frequently asked questions

Can you legally sell a house with unpermitted work in California?

Yes. No California statute forbids the sale, and buyers purchase homes with unpermitted improvements every week. What the law demands is written disclosure under Civil Code sections 1102 through 1102.17, given before title transfers. A seller cannot waive that form in an as-is sale.

Should unpermitted square footage be advertised as living area?

Treat it as described space, not as advertised living area. Fannie Mae tells the appraiser to comment on an addition that lacks the required permit, and it puts ADU area on its own line rather than folded into the main home’s finished square footage. So describe the space and state its permit status. That version holds up in an appraisal and in a disclosure review.

Does a retroactive permit increase the property tax bill?

The tax does not turn on the permit. Under Revenue and Taxation Code section 71, the assessor sets a new base year value for the new portion only, and section 72 makes cities and counties send building permits to the assessor. For the fuller picture on which projects are taxed, see does remodeling raise your property taxes in California, then consult a qualified tax professional about a specific address.

What happens if a buyer discovers unpermitted work after closing?

The exposure runs to the seller. Under Civil Code section 1102.13, a seller who willfully or negligently skips a disclosure duty owes the buyer actual damages. Code of Civil Procedure section 337.15 also keeps fraud and willful misconduct outside its ten-year limit. Anyone in that spot, on either side, should consult a qualified real estate attorney.

Is it better to permit the work or to price for it?

There is no single right answer. Selling a home with unpermitted work can go either way, and the size of the work and the timeline drive the call. Permitting first closes the question and can widen the buyer pool.

Pricing for it instead avoids a slow inspection process on a tight deadline. Run the numbers both ways before listing, alongside how to sell your home in Orange County.

Sorting out a permit history before the home goes on the market

Unpermitted work changes how a home is disclosed, priced, appraised, and insured. Sorting it out before a listing goes live beats finding it in escrow.

Michael Mellgren, REALTOR®, follows California disclosure and land-use rules closely. He can help map a home’s permit history, weigh the legalize-versus-disclose call, and build the disclosure package for any address on the list. Email Michael Mellgren about selling a home with unpermitted work, or call or text (714) 420-6629.

Some of this needs a specialist. For permitting scope and cost, consult a licensed contractor and the local building department. On disclosure and liability in a specific deal, consult a qualified real estate attorney. On assessment effects, consult a qualified tax professional.