Aerial Imagery for an Insurance Renewal or a Property Valuation

Commercial property insurance renewals and property valuations are both decided by someone who has probably never stood on the site. They work from a file: a submission, a schedule of values, some photographs, whatever the last inspection recorded, and a set of assumptions filling the gaps. On an industrial yard, an acreage of outbuildings, a multi-roof facility or anything with a complicated site plan, the gaps are where the money is.

Aerial capture is useful here for an unglamorous reason. It closes the gaps cheaply, from one visit, with a date stamp on it.

A renewal runs on whatever evidence is in the file

When an underwriter cannot establish something, they do not leave it blank. They assume, and the assumption tends to be the conservative one, because an unknown roof age on a 30,000 square foot warehouse is a loss waiting to be priced.

The same applies in reverse. Work you have already done, equipment you have already replaced, housekeeping you have already tightened up, none of it is in the file unless somebody put it there. A property that has improved materially since the last inspection reads exactly like one that has not.

So the practical question is not whether imagery lowers anybody's number. It is whether the person deciding is working from current evidence or from a three-year-old assumption. Everything else follows from that.

What an underwriter is trying to see

These are the items that are hard to establish from the ground, and they are the ones most commonly asked about on a commercial submission:

• Roof area, type and condition. The single biggest item. Ponding, blistering, failed flashing, open seams, gravel displacement, debris, ad hoc patching, and whether what is up there matches what the schedule says is up there. On a multi-building site, per-roof rather than averaged.
• Rooftop equipment. HVAC units, exhaust, condensers, solar arrays, their condition and whether anything is leaking or staining the membrane around it.
• Separation distances. Between buildings, and between buildings and stored combustibles, tanks, bins or the property line. Measured from an orthomosaic rather than estimated.
• Yard storage and housekeeping. What is stacked where, how high, how close to structures, and whether the yard is orderly. This is one of the strongest visual signals about how a site is run.
• Access for fire apparatus. Approach routes, gate widths, turning room, hydrant and water supply locations, whether a truck can actually get to the far side of the building.
• Exposures beyond the fence. The neighbour's operation, grass and brush load, drainage, grade falling toward the building, overhead lines.
• Change since the last capture. New structures, new storage, a changed use of a portion of the site. If a previous flight exists, this is a straightforward comparison.

None of that requires a specialist to interpret. It requires somebody to have looked, from above, recently, and to be able to prove when.

What an appraiser wants is slightly different

An appraiser is building a value, so the emphasis shifts from risk to geometry and condition:

• Measured site and improvement areas. Building footprints, paved and gravelled areas, fenced compounds, laydown yards. Measurable directly on a georeferenced orthomosaic rather than taken off an old site plan nobody has reconciled.
• What is actually there versus what the records say. Outbuildings that were added, structures that came down, an expansion that never made it onto the plan.
• Condition evidence. Roofs, paving, fencing, laydown surfacing. The capital items a valuation has to account for.
• Site context. Access, frontage, adjacent uses, how the parcel sits in relation to road and rail. Obliques do this in one frame better than a page of description.
• Land use breakdown. On a larger parcel, the split between developed, yard and undeveloped area, measured rather than apportioned.

The appraisal still belongs to the appraiser. What aerial capture removes is the part of their job that is reconstructing the site from incomplete records, and the uncertainty that gets priced in when that reconstruction is shaky.

The dated baseline is the part people value afterwards

This is the argument that tends to land once somebody has been through a claim.

After a hailstorm, a wind event, a fire or a collapse, the question is almost never what the damage looks like. It is what the asset looked like beforehand. Pre-existing condition is where claims get reduced, and the owner's position is usually a memory and a handful of undated photographs taken for some other purpose.

A capture flown before the event is a dated record of the whole site at a known point in time, and it is the thing that makes a pre-existing condition argument answerable rather than a matter of opinion. Flown after the event, aerial imagery documents the loss, which is useful for scoping the repair but settles nothing about what was there the week before.

The same holds for a disputed valuation or a condition argument at sale. What makes a capture defensible is the ordinary discipline: original unedited files retained, capture date and position metadata intact, and a clear record of how it was flown and processed. That is also why it is worth knowing who owns and retains the imagery before you need it, because a baseline you cannot get a copy of is not a baseline.

Where thermal earns its place, and where it does not

On a roof, a radiometric thermal pass adds something a visual pass cannot: trapped moisture in the roof assembly shows as a thermal anomaly as the roof gives up heat, and it is usually invisible from above in daylight. It also flags heat anomalies in rooftop electrical and mechanical equipment.

Two honest limits. Thermal results depend on the conditions at the time of flight, which is why the visual and thermal passes answer different questions and are usually worth buying together. And a thermal anomaly is an indication, not a diagnosis. It tells a roofing consultant where to cut a test patch. It does not replace them.

Which is the general point for both the underwriting and the valuation case. Aerial capture is screening and documentation. It finds the items worth a specialist's time and it records the state of the asset on a date. The assessment, the report and the certificate still come from the professional who signs for them.

Timing and what to hand over

Fly four to eight weeks ahead of the renewal date. That leaves time to get a specialist on anything the capture turns up, and to have the answer in the submission rather than arriving after terms are already set. Flying in the week the renewal closes mostly produces imagery nobody has time to use.

A submission-ready package is modest:

• A georeferenced orthomosaic of the whole site, measurable, with the capture date on it.
• Oblique stills from four sides, plus closer frames of each roof and any item of note.
• Per-roof imagery where there is more than one, kept separate rather than blended into a site view.
• The thermal set and the radiometric originals, if thermal was flown.
• A short written record: date, time, conditions, equipment, and a plain list of the observations with their locations.
• Measured areas for anything the broker or appraiser is going to be asked to confirm.

Send it through the broker rather than straight to the underwriter, and send it as evidence rather than as an argument. The imagery is more persuasive when it is simply the current state of the property with a date on it, and the conclusions are left to the people whose job it is to draw them. If the file is up to date, the conversation is at least about the property as it is.

UAV Imaging flies this as a standard property and asset inspection job across Alberta, and the deliverable formats are the ordinary ones, so nothing in the package needs specialist software to open.