Full Unit Collision Restoration After Severe Damage
Written by Structural Repair Lead, Structural and Frame Lead, OCRV Center. Reviewed by Claims Coordinator
In shortWhen a coach comes back to the frame and gets rebuilt outward, it stops being a repair and becomes a construction project. Expect $25,000 to $150,000+ and ten to thirty weeks.
What is a full unit collision restoration?
A full unit collision restoration strips the vehicle to its frame, verifies and corrects the structure, then rebuilds shell, systems and interior outward. We run these projects at our 35,000 square foot Yorba Linda shop for Rancho Santa Margarita owners whose coach is worth more than the damage.
- The repair or total loss decision has to be settled before work starts
- Interior comes out completely, which is what makes the hours large
- Progress is billed and photographed in stages, not at the end
- Agreed value policies change this conversation more than any other factor
- Price range
- $25,000 to $150,000+120 to 800 labor hours at $210 per hour
- Labor rate
- $210 per hourBody and paint department, with mechanical sublets billed separately
- Typical duration
- 10 to 30 weeksDriven by parts, interior scope and carrier approval cycles
- Deposits
- 50 percent over $2,000Plus 25 percent at parts arrival on jobs over $10,000
- Shop capacity
- 35,000 sq ftLong term project bays for units up to 45 feet
Last verified
Some units arrive on a lowboy with the roof rail collapsed on one side, or with three quarters of the shell opened up and the interior soaked. There is no panel to replace and no member to pull. The coach has to be taken back to the part of it that is still true, which is usually the frame, and then built outward again.
This is the smallest category we run by volume and the largest by hours. It is also the only one where the first serious conversation is not about repair at all. It is about whether rebuilding this particular unit makes sense against what it is worth and what the policy says it is worth, because those two numbers are frequently not the same.
What a full unit restoration actually means
It means the vehicle is disassembled until we reach material that measures correct, and everything outward of that boundary is rebuilt. On a rollover the boundary is usually the chassis and the floor structure. On a severe side impact it might be the opposite wall and the roof. The distinguishing feature is not the size of the number, it is that the unit is taken apart as an assembly rather than repaired as a set of damaged parts.
That approach exists because at a certain damage level, sectional repair stops being reliable. Three walls that each moved slightly do not add up to a coach that is square, and a slide room installed into a shell built from approximations will never seal. Once enough planes are compromised, correcting them together is both faster and the only way the finished unit behaves properly.
- Rollovers and units that came to rest on a corner
- High energy impacts that opened the shell rather than dented it
- Fire and heat damage extending past the visible scorch boundary
- Vintage, converted and custom units where replacement does not exist
The valuation conversation comes before the repair conversation
Every one of these projects begins with a question that has nothing to do with welding: does rebuilding this unit make financial sense. We answer it with a documented scope, a parts position and an honest hour count, then set that against what the coach is worth and what the policy actually pays. Some owners read that package and take the settlement instead, which is a good outcome bought for the price of an assessment.
Policy type moves the answer more than any other factor. An agreed value policy on a well kept diesel pusher supports rebuilds that an actual cash value policy on the same coach would never justify, and owners rarely know which they hold until it matters. Then there is the category where arithmetic is beside the point: vintage coaches and custom conversions that cannot be replaced by writing a check.
Stripping a coach back to the frame
The interior comes out completely and it comes out cataloged. Every cabinet, appliance, panel and wiring run is tagged with its location and photographed before it moves to on site storage. This is unglamorous work that consumes real hours, and it is also the thing that makes reassembly a matter of reading a record rather than reconstructing a floorplan from memory four months later.
Then the shell comes off. We follow the damage outward until the framing measures true and the substrate sounds solid, and on a rollover that line typically sits far further from the point of impact than the photographs suggest. The boundary is set by moisture meter readings and by measurement, never by where the paint stops looking bad to somebody standing outside.
Before you proceed
A unit that sat open to weather after the incident carries two damage sets. Impact damage and exposure damage are documented separately, because carriers frequently treat them differently and combining them costs the owner.
Rebuilding the shell one plane at a time
Structure gets rebuilt from the frame outward, and each plane is proven before the next one goes on top of it. Floor structure is squared and checked on the diagonal. Walls are set plumb and verified at multiple stations along the length rather than at the ends. Only then does the roof structure go on, because a roof built onto walls that lean will telegraph that lean into the roof line permanently.
Framing is fabricated here. Aluminum stock, steel tube and structural plate are cut and welded in house, which is what makes these projects possible on units where the original member was never sold as a part. Substrate goes back as Azdel or lauan depending on what the unit was built with, and skin is bonded rather than fastened wherever the original construction was bonded.
Systems, wet testing and interior reinstallation
Before any finished surface goes back, the shell gets tested. The roof is flood tested, window and door openings are checked, LP lines are pressure tested and the fresh and waste water systems are proven. Finding a leak after cabinetry is installed is one of the most expensive mistakes available on this kind of project, and the test sequence exists specifically to prevent it.
Then the cataloged interior goes back in reverse order. Components that were soaked do not return at all. Particle board cabinetry that got wet has changed its material properties permanently and will delaminate through the first humid stretch, so it is replaced rather than dried and refitted. Appliances that saw fire or extinguisher residue are replaced as a matter of course.
Schedule, staged billing and what the file is worth later
Ten to thirty weeks is the honest span. The floor belongs to units with intact interiors and available parts. The ceiling belongs to rollovers with full interior replacement, custom fabrication and a carrier approval cycle that adds a week every time a supplement is filed. Because these run long we bill and photograph in stages, so an owner who cannot visit weekly still sees where the money and the vehicle actually are.
A project this size takes a 50 percent deposit at authorization and a further 25 percent when parts arrive, standard on jobs over $10,000, and nearly every component is special order. The documentation matters beyond the repair too: a rebuilt coach delivered with a complete photographic and measurement record is a very different asset at resale from one delivered with a stack of invoices.
On cost
Hazmat handling at $45 applies where LP, refrigerant or fire residue is present. On restoration work that is the normal case rather than the exception.
Projects we take on and projects we turn down
We have the bay space for units to 45 feet and we hold long term projects indoors rather than pushing them outside between phases, which is the practical constraint most shops hit first. What we decline are units where the chassis itself is beyond correction, and units where an owner wants a rebuild started before the valuation question has an answer.
Both of those end badly and we would rather say so at the counter than three months in. The chassis case is simple: if the rails cannot be brought back to specification, everything built on them inherits the error. The valuation case is worse, because an owner who starts and then loses the total loss argument has funded a project nobody planned to buy.
What is included
- Repair or replace assessment first
- A documented scope and valuation package before any authorization, so the decision to rebuild is made against real numbers.
- Complete interior removal and cataloging
- Furniture, cabinetry, appliances and finish come out, are tagged by location and stored on site for the duration.
- Strip to frame and structural verification
- The shell comes off until we reach material that measures correct, and the chassis is verified before anything is rebuilt on it.
- Framing, floor and roof reconstruction
- Aluminum and steel framing fabricated in house, decking and substrate replaced, roof structure rebuilt and membraned.
- Exterior skin, glass, doors and full refinish
- New skin bonded, openings fitted, and the unit refinished as a complete vehicle rather than as a repaired section.
- Systems reinstallation and wet testing
- LP pressure test, water system pressure test and roof flood test before any interior finish is reinstalled.
- Interior rebuild and reinstallationwhere applicable
- Cataloged components refitted, damaged components replaced, and the unit brought back to a finished condition.
- Staged photographic recordwhere applicable
- Every phase documented for the owner and for the carrier, delivered as a complete file at handover.
How the work runs
Assess and decide
1 to 2 weeks
Before anything is authorized we produce a scope, a parts position and a realistic hour count, then set that against the unit valuation. Some owners walk away at this stage and that is a legitimate outcome. Knowing early is worth what the assessment costs.
Empty the unit
24 to 80 hours
Everything removable comes out and gets tagged by location before it moves to on site storage. Appliances, furniture, cabinetry, wiring runs and plumbing are cataloged with photographs, so months later reassembly is a matter of reading the record rather than remembering how a floorplan went together.
Strip to true material
40 to 160 hours
Skin, substrate and framing come off until we reach structure that measures correct and sounds solid. On a rollover that boundary sits much further from the impact than an owner expects, and it gets established by moisture meter and measurement rather than by how the damage appears from outside.
Rebuild the structure
60 to 300 hours
Frame and chassis are verified and corrected first, then framing, floor, walls and roof are reconstructed with the materials and joining methods the unit was originally built with. Each plane is checked for square and plumb at several stations before the next one is built on top of it.
Close the shell and test
40 to 140 hours
Skin, roof membrane, windows and doors are fitted and every penetration is properly bedded rather than sealed over. Then the unit gets a roof flood test and a pressure test on both the LP and water systems before a single interior panel goes back into the coach.
Refinish and reassemble
80 to 260 hours
The exterior is refinished as a whole unit rather than as a repaired section, so there are no repair boundaries left for a buyer to find later. Cataloged interior components go back in reverse order, systems are commissioned individually, and the coach is road checked before handover.
What this costs
$25,000 to $150,000+
120 to 800 labor hours at $210 per hour, body and paint.
- Paint supplies at $55 per paint hour.
- Body supplies at $5 per body hour.
- Hazmat and disposal $45 flat when chemicals, refrigerant or LP is involved.
- Parts at $100 or less carry 100 percent markup. Parts over $100 carry 35 percent. Special order parts require a full non refundable deposit at order.
- Sales tax of 7.75 percent applies to parts and materials. Labor is not taxed.
- A 50 percent deposit is taken at authorization on any job over $2,000, with an additional 25 percent when parts arrive on any job over $10,000. Final balance is due at pickup.
- A single side rebuild on a mid size trailer with an intact interior sits near the bottom of the range.
- A rollover on a 45 foot coach with a full interior replacement and a complete repaint exceeds the published top.
- Hazmat handling at $45 applies where LP, refrigerant or fire residue is involved, which on this work is most of the time.
How estimating is billed
- Written repair estimate: $150, credited in full against an authorized repair.
- In depth diagnostic, scan and programming: $285 per hour, one hour minimum, credited in full against an authorized repair.
- In shop pre purchase inspection: $400 to $1,200 depending on unit size and systems count.
- Insurance walk ins are accepted during posted hours. All inspection and estimating work is performed in shop at the Yorba Linda facility.
What you will notice first
- The shell is open to weather across more than one wall or the roof
- The unit came off its wheels or came to rest on a corner
- Fire, smoke or extinguisher residue has reached the interior finish
- Standing water inside after the unit sat open following the incident
- The frame or chassis rails show visible deformation over a long run
- Multiple slide openings are out of square at the same time
- The carrier has raised total loss and the owner disagrees with the valuation
- A vintage or converted unit where replacement is simply not available
How this fails, and what we do about it
| Failure mode | How we diagnose it | The fix |
|---|---|---|
| Rebuild started before the total loss position is settled | Compare the projected rebuild scope against the policy valuation basis. An actual cash value policy on a ten year old coach behaves nothing like an agreed value policy on the same unit. | Settle the valuation question in writing first. We will provide the documented scope that makes that determination accurate rather than argued. |
| Water damage layered under impact damage | Moisture meter every wall section and floor bay after the shell is opened, not before. A unit that sat open for two weeks has rot boundaries that have nothing to do with the collision. | Establish and document the two damage sets separately, since they are frequently treated differently by a carrier and combining them costs the owner money. |
| Roof rail junction rebuilt without correcting the sidewall below it | Measure the sidewall for plumb at multiple stations along the length before rebuilding the rail. A wall that leaned in the rollover carries that lean into everything built on top of it. | Correct and brace the wall to vertical, verify at each station, then rebuild the rail and roof structure onto a wall that is actually straight. |
| Systems reinstalled into a shell that was never leak tested | Pressure test LP lines and water lines and flood test the roof and window openings before interior finish goes back. Finding a leak after the cabinetry is in is an expensive way to learn this. | Full wet test sequence before any finished surface is installed. Every reopened penetration is rebedded, not skimmed. |
Why it happened
- Rollovers, which load the roof rail to sidewall junction that almost every coach is weakest at and rarely damage only one plane
- High energy side impacts from a commercial vehicle, which open the shell rather than dent it
- Fire originating at a generator bay, refrigerator or wiring run, where the heat damage extends well past the scorch line
- Extended exposure after the incident, since a shell that sat open through a storm has water damage layered on top of impact damage
- Underride against a bridge or canopy at speed, which takes the roof structure across most of the length of the unit
- Accumulated damage on a vintage or custom converted unit where a prior repair was structurally inadequate and finally let go
Parts and brands we work with
- Aluminum wall framing stock, steel tube and structural plate cut and welded in house
- Azdel composite and lauan substrate for wall and ceiling rebuilds
- Filon, Lamilux and painted aluminum exterior skin
- Dicor and Alpha Systems TPO and EPDM roof membrane
- Hehr and Kinro windows, Lippert entry doors and baggage door assemblies
- Onan and Cummins generator mounting hardware, remounted and torqued to specification
What not to try yourself
- Authorizing a rebuild before the valuation question is settled. Owners who start work and then lose the total loss argument end up funding a project they never intended to own.
- Storing a damaged unit outdoors and open while a claim is negotiated. Two weeks of weather adds a rot scope that nobody will pay for and that you will still have to repair.
- Reinstalling salvaged cabinetry that was soaked. Particle board that dried is not the same material it was, and it will fail in the humidity of the first coastal summer.
- Rebuilding a wall onto framing that measures out of plumb because the lean looks small. Every layer above it multiplies the error and the roof line is where it becomes obvious.
Which vehicles we do this on
Vehicles we perform Full Restoration on
Bus ConversionA bus conversion uses a Prevost or MCI intercity coach shell, which is a stainless steel monocoque where the skin and skeleton both carry loadLuxury Class ALuxury Class A repair covers Spartan K3 tag axle chassis coaches from Newmar, Entegra and Tiffin, with multi stage paint, porcelain tile floors, stone counters and Aqua-Hot hydronic systemsVintage and ClassicVintage coach work means riveted aluminum or stick and tin construction over timber or steel framing, bedded in butyl rather than bondedCustom ConvertedYesSkoolieSkoolie repair covers the school bus body itself: ribbed steel sides, hat channel ribs, roof raise splice bands, welded window delete plates and the original steel floor pan under the new plywoodFood TruckFood truck repair covers the step van body, the serving window aperture and its header, the roof hood curb, the coved floor under the cooking line and the generator compartmentThe hardest part of a full rebuild is not the welding, it is telling somebody the truth in week one. I have had owners come in with a coach they honeymooned in and I have had to say the numbers do not work. I would rather have that conversation while it is still a decision than six weeks later when it is a sunk cost. When the numbers do work, though, these are the best jobs in the building. You get a unit back on the road that everybody else wrote off, and you have a photo file that proves every inch of how it happened.
Appendix: questions and answers
- How do I know if rebuilding my coach is worth it?
- You compare a documented scope against the policy valuation basis, not against a guess. We produce the scope, the parts position and the hour count first. Agreed value policies frequently support a rebuild that an actual cash value policy on the identical unit would not, and most owners do not know which they hold.
- Does the entire interior have to come out?
- On a strip to frame rebuild, yes. Walls cannot be rebuilt around installed cabinetry and no leak test is meaningful with finish in place. Everything is tagged by location and photographed before it moves to storage, so reassembly follows a record rather than someone remembering how it looked.
- My unit sat open in the rain after the accident. Does that change things?
- It adds a second damage set. Rot from exposure is documented separately from impact damage because carriers often treat the two differently, and merging them tends to cost the owner. Moisture meter readings taken once the shell is open establish the boundary of each.
- How is a months long rebuild billed?
- In stages, with photographs at each one. A 50 percent deposit is taken at authorization and a further 25 percent when parts arrive on jobs over $10,000. Special order components are not refundable once placed, and we identify those line items before ordering anything.
- Will a rebuilt coach be harder to sell later?
- Not with a complete file behind it. Buyers and inspectors ask what was done and how it was verified. A rebuild delivered with staged photographs and measurement records answers that concretely. A rebuild delivered with only invoices leaves the buyer guessing, and guessing costs you at the negotiation.
- Do you rebuild vintage and custom converted units?
- Yes, and they are frequently the strongest candidates, because replacement is not available at any price. We fabricate framing in house for units where the original member was never sold as a part. The limit is the chassis: if it cannot be brought back to specification, we say so rather than build on it.
Open a file on this repair
Tell us the vehicle, what happened and whether a claim is open. We will tell you what the scope looks like and what it takes to get you back on the road.
Or call (949) 799-3387