The home inspector you hire during escrow is looking for safety problems and major repair items: the roof, the plumbing, the electrical panel. They are not specifically looking for unpermitted construction, and most do not flag it explicitly in their reports. That is a problem, because in Los Angeles, an unpermitted addition or conversion can be a $20,000 to $100,000 hidden cost the buyer absorbs after close.

If you are buying a property in LA County, this is the field guide for spotting unpermitted work before you sign the final paperwork. We cover the visual red flags, the records you should pull, and the moments in escrow when you can still walk or renegotiate.

Why buyers are the ones exposed

California’s Transfer Disclosure Statement (TDS) requires sellers to disclose known unpermitted work. The key word is “known.” A seller who genuinely did not know about an unpermitted addition (because the prior owner did the work) has no duty to disclose what they do not know. The buyer is the one who eventually pays to legalize or remove the work, and the buyer is the one who gets the Order to Comply if LADBS finds it after close.

Lenders complicate this further. FHA, VA, and most conventional loans require permitted square footage. If the appraiser excludes the unpermitted addition, the loan amount drops, sometimes mid-escrow, sometimes the loan falls apart entirely.

The 10 most common visual red flags

These are the things that should make you ask “was this permitted?” during a showing or inspection:

1. A garage that doesn’t look like a garage anymore. Finished walls and ceiling, recessed lighting, carpet on the floor, a refrigerator, a closet. Even if the garage door is still there, this is a converted ADU 90% of the time.
2. A bedroom or bathroom that wasn’t there in earlier photos. Pull old Zillow or Redfin listings for the property. If the room count grew without a known remodel, the new room is likely unpermitted.
3. A small detached structure in the backyard with electrical service. Sheds are fine. Sheds with power, plumbing, AC ducts, or sleeping space are unpermitted ADUs.
4. A second-story addition over a single-story original footprint. Visible from the street and from aerial views. If county records show a 1-story house and you see a 2-story house, the second story may not be permitted.
5. A “bonus room” or “den” that smells like new construction. Fresh drywall and paint in a room not on the original plan often means recent unpermitted finish work.
6. An enclosed patio that looks like a living room. Original outdoor patios converted into glassed-in or framed-in rooms without a permit are extremely common.
7. Bathroom plumbing where no bathroom existed. Look for the vent pipes on the roof. Each bathroom needs a vent stack. If you count more stacks than the official bathroom count, there is a hidden bathroom.
8. Mismatched electrical panel capacity. A 100-amp panel on a 1950s house that now has central AC, a finished garage, an EV charger, and an “office” in the back is overloaded. Unpermitted electrical work usually means undersized service.
9. HVAC ductwork that fans out to suspiciously many rooms. Look in the attic. Trace the ducts. If they serve rooms that are not on the floor plan, those rooms are not in the permit record.
10. A separate entrance, separate mailbox, or separate utility meter. Multiple meters on a parcel zoned R1 (single-family) almost always means an unpermitted second unit.

The records to pull before you close

Visual signs are only the start. The authoritative answer lives in two records:

1. The full LADBS permit history for the parcel. Free, public, and online. Our LADBS permit search returns every permit ever pulled on the parcel. Cross-reference each major room and structure on the property against a permit. Anything you see that does not have a corresponding permit is presumed unpermitted until proven otherwise.

2. The LA County Assessor’s improvement record. The assessor records the “improvement” footprint, including total living area, year built, year of any major additions. If the listed total square footage is 1,800 and the property feels like 2,400, there is roughly 600 unpermitted square feet on the parcel.

A 30-minute records pull is the single highest-ROI hour a buyer can spend in escrow.

What the home inspector won’t tell you

Home inspectors are good at what they are licensed for: identifying current condition issues. But they have no permit-records database, they do not cross-check the assessor footprint, and most are explicitly trained not to opine on whether work was permitted (because it is outside their professional scope and creates liability exposure).

The inspector’s report may note “this room appears to be a converted garage” but will rarely say “this conversion is unpermitted.” You have to make that call yourself, with the records in hand.

When and how to renegotiate

If you discover unpermitted work during inspection, you have three options before close. They are ordered by leverage:

Walk away. The strongest position. If you are inside the inspection contingency, you can cancel for any reason and recover your deposit. The threat of cancellation is what creates leverage for the next two options.

Seller legalizes before close. Demand that the seller pull a retroactive permit, pass inspection, and provide a clean Certificate of Occupancy before close. This pushes the cost and risk back to the seller. The downside: legalization takes 4 to 12 weeks, longer than most escrows. Sellers often refuse because it slows the deal.

Seller credits you, you take the work on after close. Most common outcome. The seller gives you a credit (typically $5,000 to $30,000 depending on the scope) in exchange for an as-is closing. You then handle legalization or removal yourself. Our remediation guide walks through what that work actually involves.

The credit amount is the negotiation. Get a written estimate from a contractor or compliance consultant before you accept a number. Buyers regularly leave $20,000 on the table because they don’t know the true cost of legalization at the moment of negotiation.

The single best move: a pre-purchase compliance audit

For complex properties (anything older than 40 years, anything with visible additions, anything where the seller is the second or third owner), an independent compliance audit is the cleanest path. We do these for buyers in LA County: a one-time review of the permit history, the assessor record, and a site visit with photos. The deliverable is a single document that lists every item, whether it has a permit, and what legalization would cost.

Cost: typically $750 to $1,500. Saved in the average case: $10,000 to $50,000. Schedule a pre-purchase audit early in escrow, before the inspection contingency expires.

Special cases to watch

Some property categories carry above-average unpermitted-work risk:

• 1950s and 1960s tract houses in the Valley: garage conversions and additions made between 1970 and 2000 with no permits
• Older Spanish and Craftsman homes in mid-city and Westside: enclosed sleeping porches, illegal basements, attic conversions
• Hillside houses in the Hollywood Hills and Mt. Washington: unpermitted decks, retaining walls, second-story additions
• Pre-1955 homes in older neighborhoods: many additions made before modern permitting, sometimes grandfathered, sometimes not
• Investor flips: aggressive value-add renovations done fast, sometimes without pulling all required permits

The bottom line

The buyer’s inspection period is the only time you have leverage over an unpermitted-work issue. Once escrow closes, you own the problem. Spend the records-pull hour. Spend the audit fee if anything looks off. Renegotiate or walk if the numbers don’t work.

Our free LADBS permit search tool is the starting point for any LA County buyer. Add a violations lookup to see if the city has already flagged the property, and a Certificate of Occupancy lookup to verify the structure has a clean record. Twenty minutes of due diligence in escrow saves five-figure mistakes after close.