Insurers score roofs from drone and satellite images, and regulators keep finding the images wrong. What to check before you waive your contingency.
Home insurers routinely underwrite roofs from aerial images rather than physical inspections, and state regulators reviewing consumer complaints have documented nonrenewals based on images that were outdated, obstructed, or of the wrong property entirely. Cosmetic algae streaking is the most common false flag. Before waiving your contingency, photograph any overhanging branches, ask the seller for the roof invoice and closed permit, and get a real quote from a carrier that has looked at the address.
Your prospective home has already been photographed from above. Probably several times, probably within the last year, and without anyone knocking on the door.
Aerial imagery — captured by fixed-wing aircraft, drones, and commercial satellites — is now standard underwriting input for residential property insurers. Images get scored by software that classifies roof condition, flags debris and overhanging vegetation, and estimates remaining service life. The output feeds renewal decisions.
For a buyer, this matters in one window: between the accepted offer and the waived contingency. That is when a coverage problem is still the seller's problem.
An image taken from several thousand feet cannot reliably separate cosmetic wear from structural failure. State insurance regulators investigating consumer complaints have documented what goes wrong, and the pattern repeats across states.
Roof algae is the most common. Gloeocapsa magma produces dark vertical streaking on humid-climate roofs. It is cosmetic — it does not change how the roof sheds water or how long it lasts. From above, at low resolution, it resembles deterioration. West Virginia's insurance regulator addressed this directly, advising that blurry or older images appearing to show staining or discoloration of shingles will usually not be sufficient, standing alone, to prove a roof needs replacing.
Shadow is the second. Tree limbs, chimneys, vents, and dishes cast shapes that read as missing shingles depending on the sun angle when the image was captured. The same roof photographed at a different hour scores differently.
Then there is plain misclassification. The North Carolina Department of Insurance received multiple complaints after one insurer issued nonrenewals from third-party drone images that were unclear enough that, in the department's own description, well-manicured flower beds were identified as yard waste.
And the images are often simply wrong or stale. Maine's Bureau of Insurance, reviewing hearing requests under the state's Property Insurance Cancellation Control Act, catalogued homeowners whose notices rested on images more than 18 months old, images that did not clearly show damage, and images of the wrong structure entirely. In several cases homeowners were never told aerial imagery was involved until shortly before their hearing.
The analytics firm Cotality projects homeowner premiums will rise roughly 8% in 2026 and another 8% in 2027 — about 16% across two years. Insurance now consumes around 9% of the typical American homeowner's monthly housing payment, counting principal, interest, taxes, and premium together.
Carriers under that pressure have moved from broad statewide risk classes toward far more granular geography, where a ZIP code or a single street carries its own loss expectation. Aerial imagery is what makes the granularity affordable. Scoring a hundred thousand roofs from the air costs a fraction of sending a hundred thousand inspectors.
The economics are sound. The classification is not always.
You get somewhere between thirty and ninety minutes inside a house you are about to spend a decade paying for. Spend part of it looking at the property the way a classifier would.
View the roof from the street, from two sides. You are not assessing it — an inspector does that. You are checking what an image would show: dark streaking, patched sections in a different shade, anything breaking the plane.
Photograph every branch overhanging the roofline. This is the most common flag that is both legitimate and trivially fixable. Worth knowing before you own it rather than after a nonrenewal notice.
Name any staining out loud, with the seller present. Ask directly whether the current carrier has ever raised it. A seller who has already fought this has no reason to hide it, and usually says so.
Ask for the roof's paper trail. Not the seller's recollection — the documents. The roofing invoice, the manufacturer's warranty registration, and the closed permit for the tear-off where the jurisdiction required one. A verified installation date is what beats an algorithm's age estimate, and it is what sellers most often cannot produce. If you cannot get it from the seller, the permit record is a public one — see our guide to looking up building permits by address.
Ask whether the property has ever been nonrenewed, and by whom. In most states this is not disclosed unless asked.
Get a real quote before the contingency deadline. From a carrier that has looked at the address. A quote is the only test that returns a number.
At least thirteen states have issued bulletins or guidance on insurer use of aerial imagery. They converge on the same four expectations, and knowing them is what turns a nonrenewal letter into a conversation.
Imagery should not be the sole basis for an adverse action. Pennsylvania's insurance department put it plainly in the earliest of these notices, in May 2024: aerial images alone showing discoloration, streaking or other cosmetic damage should not be used as the sole evidence supporting cancellation or nonrenewal. Tennessee, West Virginia, North Carolina, Maine and Michigan have since said versions of the same thing.
Images must be current and legible. Blurry, obstructed, or outdated captures do not carry an adverse action on their own.
The insurer should say the decision was image-based, and hand over the image. Maine's bulletin exists largely because insurers were not doing this.
A physical inspection should follow an ambiguous image. Pennsylvania's formulation: absent unequivocal and material damage, it would be prudent for an insurer to conduct a physical inspection to validate the specific damage the aerial image purports to show. New Hampshire takes the same position where a policyholder contests an automated decision.
One correction worth carrying, because it circulates widely and is wrong. California's AB 75 would have barred termination decisions based on images more than 180 days old, required insurers to produce images within 30 days of request, and given homeowners the right to demand an in-person inspection. It passed the Assembly in June 2025 and carried an operative date of 1 July 2026. It never became law — it was held under submission in Senate Appropriations on 29 August 2025, saw no action in 2026, and expired with the session. California homeowners do not have those protections. Anyone citing the 180-day rule in California is describing a bill.
None of this replaces an inspection. What it changes is where you point your attention during the one walkthrough you get, and which documents you ask the seller for while you still have leverage.
A roof that scores badly from the air is not necessarily a bad roof. But it is a roof that may cost more to insure, or that a carrier may decline, and finding that out after closing is considerably more expensive than finding it out in the driveway.
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In the states that have issued guidance, no. Pennsylvania's insurance department said in the earliest of these notices, in May 2024, that aerial images alone showing discoloration, streaking or other cosmetic damage should not be used as the sole evidence supporting cancellation or nonrenewal, and Tennessee, West Virginia, North Carolina, Maine and Michigan have since said versions of the same thing. At least thirteen states now have bulletins or guidance on the subject. Where an image is ambiguous, Pennsylvania's position is that it would be prudent for the insurer to conduct a physical inspection to validate the damage the image purports to show.
Not always, which is largely why Maine's bulletin exists. Reviewing hearing requests under the state's Property Insurance Cancellation Control Act, Maine's Bureau of Insurance catalogued homeowners who were never told aerial imagery was involved until shortly before their hearing, alongside notices resting on images more than 18 months old and images of the wrong structure entirely. Regulators now expect an insurer to state that a decision was image-based and to hand over the image, so ask for the image in writing rather than waiting to be shown it.
No, despite a widely repeated claim that it does. California's AB 75 would have barred termination decisions based on images more than 180 days old, required insurers to produce images within 30 days of a request, and given homeowners the right to demand an in-person inspection. It passed the Assembly in June 2025 and carried an operative date of 1 July 2026, but it never became law -- it was held under submission in Senate Appropriations on 29 August 2025, saw no action in 2026, and expired with the session. Anyone citing a 180-day rule in California is describing a bill.