For decades, the single biggest reason unpermitted work stayed under the radar was simple: no one was looking. A finished garage behind a tall hedge, a second story added without a permit, a converted accessory unit invisible from the street. Most LA homeowners assumed that as long as no neighbor complained and no permit was ever pulled on the parcel, the city would never know.

That assumption is now wrong. LADBS and the LA County Assessor systematically compare aerial and satellite imagery against the official assessor footprint, and any house that has grown without a corresponding permit is flagged. The work is not theoretical; we have seen Orders to Comply issued in 2026 for additions that were built in the 1990s, with the precipitating event being a routine aerial-imagery review.

How the imagery program actually works

The LA County Assessor pays for high-resolution aerial photography of every parcel in the county on a regular cycle, typically every two to three years. The Assessor uses it primarily for property valuation; LADBS uses it to spot construction that did not go through the permit process.

The methodology is straightforward. Every parcel has an “improvements footprint” in the assessor’s database: total square footage of the main dwelling, any accessory structures, decks, garages, pools. The footprint is updated whenever a permit is finaled. If the aerial imagery shows a structure where the database shows nothing, that is a flag for investigation. If a one-story house in the database appears as a two-story house in the imagery, that is a flag. If a flat backyard in the database now shows a 400 square-foot structure with a peaked roof, that is a flag.

The flagging is partly automated. Computer vision compares the imagery year over year and produces a list of parcels where the footprint has changed without a corresponding permit. LADBS code-enforcement inspectors then prioritize that list when they plan field visits.

What aerial imagery picks up easily

Some unpermitted work is essentially impossible to hide from imagery. Some still slips through. The breakdown:

Easily caught:

• Detached structures of any kind: sheds over 120 square feet, detached ADUs, casitas, pool houses, guesthouses
• Second-story additions (changes the silhouette)
• Roof additions, including covered patios that become enclosed living space
• Swimming pools and spas
• Garage conversions that involve removing the garage door (the door is visible from above)
• Large solar arrays installed without permits

Harder to catch:

• Interior renovations that do not change the footprint (illegal bathrooms, finished basements, illegal kitchens added to a garage that still has its door)
• Electrical and plumbing work behind walls
• Garage conversions where the door is left in place as cosmetic
• Small additions under existing roof lines

The “harder to catch” category is where most undetected unpermitted work lives in LA today. But even here, the cover is thinning. A buyer’s home inspection during a sale often surfaces interior work, and when LADBS sees a major permit filing on the parcel they cross-check the assessor’s interior square footage against what the new plans show.

What happens after the flag

An aerial flag does not automatically generate a violation notice. It generates an investigation lead. The typical sequence:

1. LADBS code enforcement queues the parcel for inspection
2. An inspector drives to the property, sometimes posts a notice, sometimes attempts contact
3. If the inspector confirms a structure that does not match permits, an Order to Comply is issued
4. The owner has a defined response window (usually 30 days) to file for a retroactive permit or demolish

The Order to Comply is recorded against the property. It surfaces in title searches, blocks refinance and resale until cured, and accrues fees on a published schedule. (For the current fee table, see our penalty schedule for unpermitted work.)

What about Google Earth and Zillow?

Public sources like Google Earth and Zillow’s “satellite view” use lower-resolution imagery and update less frequently. They are not the source LADBS uses. But here is the uncomfortable part: if you can see your unpermitted addition on Google Earth, your neighbors can too. Anonymous tips from neighbors using Google Earth screenshots are a documented source of code complaints in LA County.

What this means for current homeowners

If your property has unpermitted work that is visible from above, the practical risk profile has changed. Five years ago, you might reasonably gamble that no one would notice. Today, the imagery cycle and the assessor cross-check make it more a question of when than whether.

Three pragmatic stances exist:

Legalize now. If the work could pass current code with reasonable upgrades, the cost of retroactive permitting is almost always lower than the cost of forced compliance after an Order to Comply is issued (fees double, daily fines start, financing dries up). Our remediation process is the route most owners take.

Plan to remove before sale. If the work cannot pass current code, the cheapest path is often to demolish and restore the property to its last permitted state before listing. Buyers and lenders will require this anyway.

Disclose and discount. California requires sellers to disclose known unpermitted work. If the buyer accepts the property as-is with full knowledge, the transaction can close, but expect a meaningful discount and a potential lender problem.

What this means for buyers

If you are about to buy a property in LA County, the aerial-imagery program is your ally. Two things to do before you close:

1. Pull the parcel’s full permit history through our free LADBS permit search tool and compare it against the assessor footprint shown on the seller’s disclosure.
2. If anything is missing or unclear, get a pre-purchase compliance audit. We have caught significant unpermitted work in escrow that the seller did not know about, and we have walked buyers through legitimate price reductions or seller-funded retroactive permits before closing.

The bottom line

The era of unpermitted work being a quiet, unknowable secret on a property is ending. Aerial imagery, automated cross-checks, and assessor databases are making most exterior unpermitted work findable in under two years. The right move for owners is to take stock, choose between legalization and removal, and act before the city does it for you.

If you are not sure whether your property is in the queue, we can run a fast diagnostic. Schedule a free consultation or run a quick check yourself with our violations lookup and permit search tools.