The conversation usually starts the same way. Someone calls us about a house in Cambrian Park or Berryessa, we ask the ordinary questions, and about four minutes in there’s a pause. “There’s one thing. The garage — it’s a bedroom now. My dad did it in the eighties. I don’t think he pulled a permit.”
That pause carries a lot of worry, and most of it is misplaced. Unpermitted work does not make your house unsellable, it is not a criminal matter, and in San Jose it is closer to the norm than the exception on older housing stock. What it does do is change three concrete things: what you are legally required to tell a buyer, how the house appraises, and which buyers can actually close on it. Get clear on those three and the decision in front of you is usually straightforward.
This guide covers what counts as unpermitted work, what California disclosure law requires of you, what happens at the appraisal, and the three real paths forward — legalize it, remove it, or sell as-is and hand the problem to someone who deals in it.
Permit rules, disclosure duties, and code enforcement all turn on the specific facts of your property. This explains how things generally work for San Jose homeowners. Before you file a permit application, sign a disclosure, or decide to demolish something, talk to a California real estate attorney and confirm current requirements with the City of San José Permit Center. See also our page on selling a San Jose house as-is.
Why So Many San Jose Homes Have Unpermitted Work
Drive through Willow Glen, the Rose Garden, East San Jose, or the older tracts off Story Road and you are looking at housing built largely between the 1920s and the 1970s, on generous lots, in a valley that has spent the last fifty years absorbing far more people than it built homes for. When a family needed another bedroom, a home office, a place for a grandparent, or rental income to carry a mortgage, the space was often already there in the form of a garage, a covered patio, or a back corner of the lot.
Some of that work went through the City. A great deal of it did not. Permits cost money and time, inspections invite scrutiny, and for decades the practical risk of skipping the process was close to zero — nobody was going to knock. The result is a housing stock in which converted garages, enclosed patios, added bathrooms, and detached back-yard units are extremely common, and a meaningful share of them have no paperwork behind them at all.
Two things changed. California spent the last several years aggressively legalizing accessory dwelling units as a housing-supply strategy, which brought the whole category into daylight. And buyers got better information — permit history is now a routine part of due diligence rather than something only a careful agent thought to check. So the work that sat quietly for forty years tends to surface at exactly the moment you are trying to sell.
Unpermitted work doesn’t make a house unsellable. It changes who can buy it.
What Actually Counts as Unpermitted Work
Homeowners tend to picture a whole illegal cottage in the back yard. In practice the range is much wider, and the smaller items matter more than people expect because they are the ones sellers forget to mention.
The common San Jose situations
- Garage conversions. The single most common one. A two-car garage becomes a bedroom, a studio, or a rental unit. Often the garage door is still in place on the outside, which is why the county records may still show it as a garage.
- Enclosed patios and sunrooms. A covered patio gets walls, windows, and eventually heat — at which point it has become conditioned living space and should have been permitted as such.
- Back-yard units. A shed, workshop, or pool house that acquired a bathroom, a kitchenette, and a tenant. Under current state law this is an accessory dwelling unit, permitted or not.
- Added bedrooms and bathrooms. Especially bathrooms, because they involve plumbing and drainage work that inspectors care about.
- Electrical and plumbing upgrades. Panel replacements, added circuits, and repiping are permit-triggering work that homeowners routinely treat as maintenance.
- Structural changes. Removing a wall to open a kitchen, or altering a roofline. These are the ones with real safety implications if the wall was load-bearing.
What is usually fine
Cosmetic work generally does not require a permit — paint, flooring, cabinets, countertops, fixtures swapped one-for-one. The dividing line is roughly whether you changed the structure, the systems, or the use of the space. A new kitchen island is cosmetic. A new kitchen where a bedroom used to be is not.
A structure built legally under an older code can be legally non-conforming today — that’s genuine grandfathering. Work that never had a permit was never legal to begin with, so age alone does not cure it. Forty years of nobody noticing is not the same as approval, and it will not read that way on a disclosure form.
You Have to Disclose It — and “As-Is” Doesn’t Change That
This is the part sellers most often get wrong, and the part with the most expensive downside.
California Civil Code section 1102 requires the seller of most residential property to deliver a Transfer Disclosure Statement to the buyer. That form asks, in plain language, whether the seller is aware of any additions, alterations, or repairs made without necessary permits or not in compliance with building codes. You answer in good faith, based on what you actually know.
Two things about that obligation surprise people:
- Selling “as-is” does not waive it. As-is describes who pays for repairs. It is not a disclosure exemption, and California treats attempts to waive the statutory disclosure as void. You can sell a house in any condition; you cannot sell it in silence.
- Inheriting the situation does not erase it. If a previous owner did the work and you know about it, you know about it. What you are not required to do is investigate and discover things you have no knowledge of — the standard is honest disclosure of what you know, not a permit audit.
The reason to take this seriously is not the City. It is the buyer. A buyer who discovers unpermitted work after closing that you knew about and did not disclose has a claim, and California courts have made sellers pay the cost of permitting or removal plus damages. Compare that to the alternative: disclosing up front costs you some negotiating leverage and possibly some price. Concealing it can cost you the price and a lawsuit, years after you thought the house was behind you.
Sellers who describe an unpermitted converted garage as a legal bedroom — in the disclosure, in the listing, or in the square footage — are not just failing to disclose. They are affirmatively representing something untrue about the property. That is the fact pattern that produces post-closing litigation. If you are unsure how to characterize a space, say what you know and let the buyer and their inspector reach their own conclusions.
What It Does to Your Price: Appraisers, Lenders, Buyers
Here is where the money actually moves. Three separate mechanisms are at work, and they compound.
1. The appraiser probably won’t count the square footage
Appraisers working to the major loan guidelines generally exclude unpermitted space from a home’s above-grade living area. Lender instructions vary — some tell the appraiser to ignore the space entirely, others allow some contributory value if comparable homes in the neighborhood have similar space — but the reliable outcome is that a 400-square-foot converted garage does not appraise as 400 square feet of house.
This is usually the moment expectations break. The owner has been thinking of the home as a four-bedroom for twenty years. The appraisal comes back describing a three-bedroom with a non-conforming bonus space, and the gap between those two numbers is real money in a market like ours.
2. Some lenders decline the file entirely
Lender appetite for unpermitted work ranges from “fine, we’ll just not value it” to “we won’t lend on this property.” A buyer who is pre-approved is not necessarily pre-approved for your house. When the underwriter sees a permit issue on a property the loan is secured by, the file can die late in escrow — after you’ve moved out, taken the house off market, and made plans around a closing date.
3. Retail buyers price in the worst case, not the likely case
A buyer reading your disclosure has no way to size the risk. They don’t know whether legalization means a $4,000 permit run or opening walls and redoing the electrical. So they either walk or they assume the expensive version and discount accordingly. Our breakdown of cash buyer vs. realtor runs the general net-proceeds math, and the same logic applies here with extra force: the discount a nervous retail buyer applies to an unknown is frequently larger than what the fix actually costs.
The combined effect is a smaller buyer pool, a longer time on market, and a higher chance of a deal collapsing at underwriting. For context on how the broader market is behaving, see our San Jose housing market guide.
Your Three Options, Side by Side
Every San Jose seller with unpermitted work ends up choosing among the same three paths. There is no universally correct one — it depends on the nature of the work, how much time you have, and whether you have cash to put into a house you are leaving.
| Legalize It | Remove It | Sell As-Is | |
|---|---|---|---|
| What you do | Apply for permits, correct code items, get final inspection | Restore the space to its permitted condition | Disclose it and sell to a buyer who accepts it |
| Time | Months, sometimes longer with corrections | Weeks to months | As little as a week |
| Out of pocket | Permit fees plus whatever the corrections cost | Demolition and restoration cost | None |
| Certainty | Low until inspections pass | Moderate | High |
| Effect on price | Best case, if it passes | Neutral to negative — you lose the space | Discounted, but known up front |
| Best for | Owners with time, cash, and work that’s close to code | Small, clearly non-compliant work | Estates, out-of-area owners, anyone on a deadline |
Notice what the table doesn’t say: it doesn’t say legalizing is the “right” answer. Legalizing is the best outcome and frequently the worst process, because you are funding an open-ended construction project on a house you are trying to leave, with no guarantee about what the inspector asks for once the walls are open.
Legalizing It: Amnesty and AB 2533
If the unpermitted work is a dwelling unit — a converted garage someone lives in, a back-yard unit, a junior unit carved out of the house — the legal landscape has genuinely improved for owners in the last few years, and it is worth understanding before you write the path off.
The City of San José ADU Amnesty Program
San José runs an ADU Amnesty Program aimed at exactly this situation: owners of unpermitted accessory dwelling units, including garage and room conversions, who want a route to legalize without being punished for coming forward. The City waives the illegal-construction penalty fee for amnesty applicants and describes total potential fee savings of more than $10,000, with further waivers available to applicants who meet a financial-hardship standard. The program also contemplates evaluating the unit against the code in effect when it was built, rather than forcing a full modern-code rebuild.
Program terms and eligibility change over time. Confirm the current requirements directly with the City of San José Permit Center before you make a decision that depends on them — and before you tell a buyer the unit can be legalized.
AB 2533, effective January 1, 2025
State law now backs that up. AB 2533 took effect on January 1, 2025 and applies to accessory dwelling units and junior ADUs constructed before January 1, 2020. Two provisions matter to a seller:
- The city generally cannot just say no. A local agency is barred from denying a permit to legalize a qualifying pre-2020 unit unless it finds that correcting the violation is necessary to protect against a substandard condition.
- Enforcement can be delayed up to five years. The law provides for a delay of building-code enforcement, and a pause on related penalties, for up to five years while non-safety items are brought into compliance.
What AB 2533 does not do is make the unit legal by itself. Health and safety conditions still have to be corrected, and the unit still has to actually be permitted. It removes the fear that applying will trigger an immediate order to demolish — which, for decades, was the main reason nobody applied.
Even under amnesty, legalization runs on the City’s calendar, not yours. Plan check, corrections, re-submittals, and inspections take months, and the scope can grow once an inspector sees behind the drywall. If you are selling because of a job relocation, a probate deadline, or a mortgage you can’t carry, that timeline is the reason legalizing often isn’t realistic — not the cost.
What Legalizing Does to Your Property Taxes
There is a property-tax consequence to pulling a permit, and sellers deserve to hear it plainly rather than discover it later.
Under California’s rules, new construction is assessed at its value when it’s completed, and that value is added to your existing base year value. The rest of the home keeps its Proposition 13 assessment — legalizing an addition does not reset the whole property to today’s market value. That is the good news, and it is a meaningful distinction on a house that has been in the family for decades.
The mechanism that catches people is discovery. Permit-issuing jurisdictions report permits to the county assessor, so the permit itself is what puts previously invisible square footage on the assessment roll. And construction that was never reported can be picked up later as an escape assessment, which reaches back to cover prior years rather than starting fresh from the date of discovery.
None of that is a reason to avoid legalizing. It is a reason to know the number before you commit. Run your specific situation past the Santa Clara County Assessor at (408) 299-5500. If the property came to you through an inheritance, the assessment picture is more complicated still — our guide to Prop 19 and inherited San Jose homes covers how that interacts, and the inherited property page covers how we work with estates.
When Tearing It Out Is the Cheaper Answer
Removal gets dismissed too quickly. For certain work it is genuinely the fastest and cheapest resolution.
One caution: demolition work can itself require a permit, particularly where structural, electrical, or plumbing elements are involved. Do not create a second violation solving the first.
Selling As-Is With the Permits Unresolved
For a large share of the San Jose sellers we talk to, the honest answer is that the permit question is not really their question to solve. An estate does not want to open a construction project. Someone relocating in six weeks doesn’t have a year. A landlord who is done being a landlord is not going to spend the next eight months in plan check on a house they are trying to exit — our tired-landlord page and the landlord’s guide to selling with tenants in place cover that overlap, since unpermitted units are very often the rented ones.
The calculus changes again if the City has already opened a case on the property — a Notice of Violation or an administrative citation puts a clock on the decision that a quiet unpermitted conversion does not. Our guide to selling a house with code violations in San Jose walks through how enforcement escalates, the appeal deadlines, and when penalties start outrunning the cost of just selling.
Selling as-is to a cash buyer changes the structure of the problem in three ways:
The trade-off is the honest one we make on every page of this site: a cash offer is below retail. What you are buying with that difference is certainty, speed, and the removal of an open-ended construction obligation. For some sellers that trade is obviously worth it and for others it isn’t — and we would rather you run the numbers than take our word for it. Our guide to what buyers actually deduct on an as-is sale shows how condition translates into an offer, and you can see real before-and-after San Jose projects we’ve taken on in worse shape than yours.
Find Out What the Permit Situation Actually Costs You
Tell us what’s unpermitted and we’ll tell you straight what it does — and doesn’t do — to the number. Free, no obligation, no repairs, no showings.
How to Find Out What’s Actually Permitted
Before you decide anything, it helps to replace assumptions with records. Most owners have never looked, and the answer is sometimes better than they feared — work they assumed was unpermitted occasionally turns out to have been permitted by a prior owner.
- Pull the City’s permit history. The City of San José Permit Center maintains records of permits issued for a property. Records for older work can be thin, and an absence of records is not proof that no permit was ever issued — but it tells you what you can and cannot document to a buyer.
- Compare the county’s record to the actual house. The Assessor’s property characteristics show bedroom and bathroom counts and square footage. If the house has four bedrooms and the record shows three, you have located your issue.
- Check the unincorporated question. Not every address with a San Jose mailing address is inside city limits. If the property is in unincorporated Santa Clara County, the County — not the City — is your permitting authority, and the programs differ. Our locations page covers the areas we buy in across the South Bay.
- Write down what you actually know. Who did the work, roughly when, and whether anyone recalls an inspection. This becomes your disclosure, and being specific about the limits of your knowledge is better than guessing in either direction.
Once you have that, the choice among the three paths tends to make itself. If the work is minor and close to code and you have time, legalize it. If it’s small and adds nothing, remove it. If it’s a real unit, or the house is an estate, or you’re on a clock — the fastest route to a resolved situation is to sell it to someone who does this for a living. For the full fast-sale process start to finish, see how to sell your house fast in San Jose, or browse the full FAQ for the questions sellers ask us most.
Frequently Asked Questions
Do I have to disclose unpermitted work when selling a house in San Jose?
Yes. California Civil Code section 1102 requires the seller of most residential property to give the buyer a Transfer Disclosure Statement, and that form asks directly about additions, alterations, or repairs made without necessary permits. You disclose what you actually know, in good faith. The disclosure requirement is not waived by selling as-is, and it does not disappear because the work was done by a previous owner and you simply inherited the situation. Concealing known unpermitted work is how sellers end up in litigation after closing, which is a far more expensive outcome than the discount the disclosure would have cost.
Can I sell a San Jose house with an unpermitted garage conversion?
Yes. There is no law preventing the sale of a home with unpermitted work, and converted garages are one of the most common situations in San Jose. What changes is who can buy it and at what price. Some mortgage lenders decline the file outright, others lend but instruct the appraiser to assign no value to the unpermitted space, and many retail buyers walk once they read the disclosure. That narrows the buyer pool toward cash buyers and investors, who price the permit risk into the offer rather than treating it as a reason to cancel.
Does unpermitted square footage count toward my home’s appraised size?
Usually not in the way you would hope. Appraisers working to the major loan guidelines generally exclude unpermitted space from the above-grade living area, and lender instructions vary from ignoring the space entirely to allowing some contributory value if it is comparable to other homes in the neighborhood. The practical result is that a 400-square-foot converted garage often does not appraise as 400 square feet of house. This is the single biggest reason a homeowner’s expected price and the lender’s appraised value come apart on a property with unpermitted work.
What is the City of San José ADU Amnesty Program?
It is a City of San José program that gives owners of unpermitted accessory dwelling units, including converted garages and other rooms turned into separate living space, a route to legalize them. The City waives the illegal-construction penalty fee for amnesty applicants and describes total potential fee savings of more than $10,000, with additional waivers available to applicants who meet a financial-hardship standard. Program terms and eligibility change over time, so confirm the current requirements with the City of San José Permit Center before you rely on it in a sale.
Does AB 2533 mean the city has to approve my unpermitted ADU?
Not automatically, but it moved the presumption in the owner’s favor. AB 2533 took effect January 1, 2025 and applies to accessory dwelling units and junior accessory dwelling units built before January 1, 2020. It bars a local agency from denying a permit to legalize such a unit unless the agency finds that correcting the violation is necessary to protect against a substandard condition, and it provides for a delay of building code enforcement of up to five years while non-safety items are corrected. Health and safety problems still have to be fixed, and the unit still has to be permitted.
Will legalizing an unpermitted addition raise my property taxes?
It generally adds to them rather than resetting them. Under California’s rules, new construction is assessed at its value when it is completed and that value is added to the existing base year value, while the rest of the home keeps its Proposition 13 assessment. Pulling a permit is also what puts the work on the Assessor’s radar, since permit-issuing jurisdictions report permits to the county assessor. Construction that was never reported can be picked up later as an escape assessment covering prior years. Confirm your own numbers with the Santa Clara County Assessor at (408) 299-5500 before you decide.
Does Peachtree Homes buy San Jose houses with unpermitted work?
Yes, regularly. Unpermitted garage conversions, additions built decades ago by a previous owner, and back-yard units with no paperwork are ordinary situations for us rather than deal killers. We buy as-is, we do not need a lender’s approval of the square footage, and we take on the permit question ourselves after closing, so you are not paying to legalize a house you are trying to leave. Call (408) 549-7183 and we will tell you plainly what the permit situation does and does not change about the number.
