What follows is our general observations and opinions. It is not legal advice, and it is not a definitive statement of California law. Every situation depends on its own facts.
An accessory dwelling unit changes a Los Angeles transaction more than almost any other feature of a property. Done properly it adds income, flexibility and value. Done informally — and a great many were done informally — it can bring an open code enforcement case, a financing problem, a tenant with occupancy rights the buyer did not expect, and a disclosure exposure for the seller.
The single question that decides which of those you are dealing with is whether the unit is permitted and finalled. Not whether it looks finished, not whether a contractor said it was fine, and not whether the seller believes a permit was pulled. Whether the permit exists and the final inspection was signed off.
Start with the permit record, not the listing
Our first step on any property with a second unit is to pull the building record from the Department of Building and Safety and read it against what is physically there. What we are looking for is a permit that matches the structure as built, and evidence that it was finalled rather than left open.
An open permit is its own problem. It is not the same as no permit, and it is frequently easier to resolve, but it does not close itself and lenders notice it. A permit finalled for a garage conversion in 2019 is a different conversation from a garage that was quietly converted in 2019.
Worth checking at the same time: whether the property sits in a hillside or very high fire hazard severity zone, whether there is a historic overlay, and whether the lot is in a specific plan area — each of which can affect what was allowed to be built and what can be legalized now.
Unpermitted conversions: the real cost is rarely the fine
Unpermitted conversions are common here, and buyers frequently underestimate what resolving one involves. The cost is rarely a fine. It is that legalizing an existing structure means bringing it to current code, and the parts of the work that matter most are the parts that are now hidden — foundation and structural adequacy, egress and ceiling heights, fire separation between units, electrical service capacity, and plumbing that was often run without inspection.
California has made ADUs substantially easier to permit than they once were, and Los Angeles operates processes for legalizing existing unpermitted units. Our experience is that the outcome is genuinely fact-specific: some conversions legalize with modest work, and others need the walls opened. A buyer who assumes the first will happen, and a seller who represents that it will, are both taking a position they cannot support.
Practically, the useful thing to do during the contingency period is not to guess. Have a contractor and, where structure is in question, an engineer look at it, and get a written scope. That converts an unknown into a number, and a number can be negotiated.
Financing and appraisal are the quiet dealbreaker
This is where transactions actually fall apart. An appraiser generally cannot give full value to unpermitted square footage, and many lenders will not lend against it. A buyer relying on projected ADU rent to qualify may find that the rent cannot be counted where the unit is not legal.
The sequence that causes trouble is familiar: the property is marketed with the ADU income, the buyer offers on that basis, the appraisal comes in without it, and the deal has to be renegotiated late — frequently after contingencies have been removed, which is precisely when the buyer has least leverage. If ADU income is part of why you are buying, we would resolve the permit and appraisal question before the loan contingency is released, not after.
A tenant in the ADU changes what you are buying
An occupied ADU is not a spare room. If the unit is tenanted, the tenancy generally transfers with the property, and the buyer inherits it.
What follows from that needs checking rather than assuming:
- Whether the unit is covered by the city’s Rent Stabilization Ordinance or by state rent and just-cause rules. Coverage turns on the property and the unit, and it is not always obvious.
- What the rent actually is, evidenced by a lease and a payment history rather than a spreadsheet.
- Whether the security deposit is being transferred at closing, and on what accounting.
- Whether an owner-move-in plan is realistic, which depends on the rules applicable to that unit and frequently carries relocation obligations.
- Whether the unit can lawfully be rented at all, because an unpermitted unit that is being rented raises habitability and code exposure that transfers to the new owner along with the building.
We would ask for estoppel certificates from any occupant, for the same reason they are used in commercial transactions: it puts the tenancy terms in writing, signed by the person who will later be your tenant.
What a seller should disclose
Our view is that sellers get into difficulty here through optimism rather than concealment. California’s disclosure regime has a statutory component and a broader common law duty to disclose facts materially affecting the value or desirability of the property that are known to the seller and not known to or readily observable by the buyer. A second unit that the seller knows was built without permits is squarely the kind of fact that duty is aimed at.
The safer course, and in our experience the one that produces fewer post-closing claims, is to disclose the permit status plainly, hand over whatever records exist, and decline to characterize what it would take to legalize the unit. Describing an unpermitted conversion as “permitted” or as “easily legalized” is where the exposure is created. Saying what you know, and saying you do not know the rest, is not a weak position — it is the accurate one.
How we work on these
Reviewing a purchase agreement, reading the permit record against the disclosures and advising on contingency strategy is hourly or flat-fee work, and we generally quote a flat fee for a defined review. Where a disclosure dispute arises after closing and has to be pursued, that is handled under a separate written fee agreement setting out the arrangement for that matter. No outcome is ever guaranteed, and past results do not predict future results.
If you are buying or selling a Los Angeles property with a second unit and the permit position is unclear, talk to us before contingencies come off. Call (310) 556-9692.
Related reading: our real estate resource page, plus buying a home with unpermitted construction, what the Transfer Disclosure Statement requires, and what an as-is sale does and does not protect.
These are our general observations and opinions only. They are not legal advice and not a definitive statement of California law, every situation turns on its own facts, and reading this does not create an attorney-client relationship between us.
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