Why would I pay for an assessment when I already have an estimate?

Because an estimate written from the outside is a description of what is visible, and on a large vehicle the visible damage is routinely a third of the total. Owners who accept a settlement based on a visual estimate frequently discover the rest during the repair, at which point they are arguing a supplement from a weaker position. An assessment that opens the structure first converts an argument into a documented fact.

What do you actually do during an assessment?

Depending on scope: remove trim and panels in the impact zone and on the opposite side, put the chassis on the rack and measure against factory specification, moisture-meter the walls and floor along suspected intrusion paths, inspect wiring in any compressed cavity, cycle slide-outs and doors under observation, and photograph every step. You get the photographs and the findings whether or not you have the repair done here.

Will the assessment cost come off my repair?

Yes. Assessments start at $150 and in-depth work is billed at the diagnostic rate of $285 per hour, and the full amount is credited back against an authorized repair. If the assessment finds nothing significant, you have paid a few hundred dollars to know that, which is generally cheaper than the alternative.

Can you assess a vehicle I am thinking of buying?

Yes, and it is one of the more useful things we do. A pre-purchase assessment on a used coach or fifth wheel finds previous improper repair, hidden water damage and frame history that a seller may not know about or may not mention. See our pre-purchase inspection service for how that runs.

My insurer says there is no additional damage. What now?

Ask them to document the basis for that conclusion. An adjuster who has not opened the structure is stating an opinion about something they have not examined. Our assessment produces photographs and measurements, which we submit as a supplement. Carriers respond to documented findings far differently than they respond to a shop asserting that more work is needed.

Hidden Collision and Water Damage Assessment

Hidden Damage Assessment

In short: The damage that decides whether a repair costs eight thousand dollars or forty is almost never the damage you can see, which is why a proper assessment means pulling panels rather than walking around the vehicle with a clipboard.

Typical range

$150 to $2,500+

Labor hours

1 to 12 hours

Updated

July 30, 2026

There is a specific moment in most large-vehicle repairs where the number changes. It is the moment the first panel comes off.

Before that point everyone involved, the owner, the adjuster and the shop, is working from what can be seen. After it, everyone is working from what is there. On a car those two are usually close. On a 40 foot coach with a fiberglass shell over a welded cage, they frequently are not.

Why the outside tells you so little

A large vehicle is built as a shell over a structure with services threaded between the two. The shell is fiberglass, filon or aluminum, and it is comparatively flexible. It absorbs and hides deflection that the structure underneath has already taken permanently.

So an impact that leaves a modest visible mark can have:

Moved the cage enough to put a slide opening out of square
Cracked a seam and opened a water path that will not present symptoms for a year
Compressed a wall cavity onto a 12 volt harness
Shifted a window frame, which opens a leak the moment it rains sideways
Deflected the chassis in a plane you cannot see without a rack

None of that shows up in a photograph of the dent.

What an assessment covers

The scope scales with what the damage suggests. A rear-end impact on a travel trailer gets a different assessment from a roof strike on a Class A.

Panel removal in the impact zone and beyond it. Energy travels. We open the opposite side and the adjacent structure, not just the point of contact.

Chassis measurement. On the rack, three planes, against factory specification, with a printed comparison sheet.

Moisture mapping. A meter along the suspected intrusion path, into the wall cavity and the floor. Water damage found at three months is a repair. Found at three years it is a rebuild.

Electrical inspection. Any cavity that was compressed gets its harness inspected for chafe and pinch. This is a fire risk, and it is one that presents months later.

Mechanical cycling. Slide-outs run under load rather than extended once. Doors, compartments, awnings, leveling jacks. Binding is the symptom that reveals a structure that has moved.

Photographic record. Every step, before and during, timestamped. This is the deliverable that matters most on an insurance job.

What it costs

Scope	Typical cost
Standard estimate with visual inspection	$150
In-depth diagnostic, first hour	$285
Panel removal and chassis measurement	$650 to $1,400
Full teardown assessment on a large coach	$1,400 to $2,500

All of it is credited back in full against an authorized repair. Diagnostic labor is $285 per hour with a one hour minimum, and body labor for panel removal is $210. The pricing page has the complete rate sheet.

The insurance case for doing this first

Most owners meet a supplement the hard way: the repair starts, more damage surfaces, the shop stops, the carrier is asked for more money, and the owner spends three weeks in the middle of that conversation with their vehicle in pieces.

Assessing before the claim is settled inverts that. The findings go in as documented fact with photographs attached, the adjuster writes against the real scope, and the repair proceeds without a mid-job pause. It does not eliminate supplements, because some things are only visible once repair begins, but it moves the large ones to the front where they are easier to approve.

It also matters for total loss determinations. A carrier deciding whether to total a vehicle is comparing repair cost to actual cash value. If the repair cost they are working from is a visual estimate, it is wrong in both directions: it may understate the damage and lead to a settlement that will not cover the work, or overstate it based on assumption and total a vehicle that was repairable.

Our insurance section covers this in more detail, including the things carriers do not volunteer.

When to ask for one

After any impact on a coach, fifth wheel or converted van, even a modest one
When a slide, door or compartment stopped working right and nobody can say why
When you have a leak and cannot find the source
When a previous repair did not resolve the symptom
Before buying a used coach, fifth wheel or converted van
When your carrier's estimate looks low against the damage you can see

Assessments are scheduled rather than taken as walk-ins, because they occupy a bay and a technician for hours. Call and describe what happened and we will tell you which level of assessment the situation actually warrants, including when the answer is that a standard estimate will do.

Bring us the job the other shop turned down

We work on all years, all makes and all classes, from Class A diesel pushers down to enclosed cargo trailers. Estimates are $150 and are credited back against an authorized repair, so the money goes toward the work rather than to a shop that never touches your vehicle.

23281 La Palma Ave, Yorba Linda, CA 92887 | (949) 799-3387