RVs and Motorhomes
Bus Conversion and Skoolie Repair for San Clemente Owners
Short answer
Skoolies fail where the builder cut. Roof raise splices, plated window openings and rocker rust carry loads the original bus body never planned for. We repair to the ribs.
Bus conversion and skoolie repair at OCRV Center covers roof raise seam correction, rust cut-out and panel replacement, plated window opening repair, floor and rocker structure, collision work and full refinish. Everything is done in shop at our Yorba Linda facility near San Clemente.
Updated 2026-07-29 by OCRV Center Editorial Team
A school bus body is a semi-monocoque: steel ribs on roughly 28 inch centers, tied to a floor structure and skinned with riveted steel panels, with the window openings acting as part of the load path. It is a genuinely strong structure as built. Then a converter cuts the roof, raises it, splices in new sheet, plates over half the windows and removes a lot of the seat track that was tying the floor to the ribs. Every one of those changes takes load out of one place and puts it somewhere else.
We repair a lot of these, and the pattern is consistent regardless of whether the donor was a Blue Bird, a Thomas Built, an IC or an older International. The splice line from a roof raise cracks or leaks. Plated window openings rust from behind the plate. The rocker panel and wheel well corrode where the original drain paths were blocked by a new subfloor. None of that is a reason not to own one. It is a reason to have the work done by somebody who knows where a bus body actually carries its load.
What Fails on This Class, and Where
These are the specific failure points we see on this build type, not general advice that applies to every coach on the road.
- Cracked rib splices from an unsleeved roof raise
- Ribs butt welded during a roof raise without an internal splice sleeve crack at the weld toe under normal body flex. The cracks appear at the same height across several ribs and let the roof section move independently of the lower body.
- Corrosion behind plated window openings
- A plate riveted over a window opening with insulation packed behind it traps condensation against bare steel with no drainage. Rust starts on the inside face, and by the time it streaks from a rivet head the flange behind the plate is already perforated.
- Rocker channel and wheel well rot from blocked drains
- Converters lay a new subfloor over the original drain paths, so water entering at a roof or window penetration collects in the rocker channel. The rocker rusts through from inside, then the wheel well lip goes, then the floor edge follows.
- Leaking roof hatch and vent frames
- Original roof hatches replaced with RV vents leave an opening in a structural roof panel closed with sealant and a thin flange. Panel flex works the sealant loose and the vent frame starts weeping at the upstream corner where nobody looks.
- Body panel oil canning at old seat track anchor lines
- Removing seat track takes tension out of the floor to sidewall connection. The lower skin panels lose their preload and start oil canning, which reads as sloppy bodywork but is actually a structural change made during the conversion.
Roof Raise Splices and How They Fail
A roof raise cuts every vertical rib and every skin panel at one height, lifts the roof, and splices in new material. The good ones use a full length inner splice sleeve on each rib, welded on both sides, with the new skin lapped and sealed. The rough ones butt weld the ribs with no sleeve and rivet a strip over the outside. Both look identical once painted. The difference shows up two years later when the butt welds crack at the toe and the skin strip starts weeping at every rivet.
When we take one of these in, the first move is to determine what is actually behind the splice line. That means pulling interior finish at a few points and looking, not guessing from the outside. If the rib splices are sound and only the skin is leaking, the repair is a skin and sealing job. If the ribs were butt welded without sleeves, the honest answer is that the splices need to be reworked, and that is a substantially larger job that we will lay out in writing before anyone commits to it.
- Rib splice method
- Sleeved and double welded rib splices carry load properly. Plain butt welds crack at the weld toe under body flex, and the crack propagates along the same height across multiple ribs.
- Skin lap and rivet line
- New skin lapped over old and riveted needs sealant between the layers, not just over the rivet heads. Sealant applied on top of a dry lap fails from the inside where nobody can see it.
- Corner post continuity
- The four corner posts carry the most load in a bus body. A raise that splices them without proper reinforcement leaves the whole body softer in torsion than it was before.
- Roof hatch and vent relocation
- Original roof hatches often get moved or replaced with RV vents during a raise. Every relocated opening is a new hole in a structural panel and needs a proper reinforced frame, not just sealant.
Rust, Plated Windows and Hidden Corrosion
Plating over window openings is standard practice on conversions, and it is also the most reliable rust generator on the vehicle. The typical method is a sheet riveted or welded over the opening from outside, with insulation packed against the back of it from inside. That traps condensation against bare steel with no path out. Steel that had been dry for thirty years starts corroding, and because the corrosion is behind the plate, the first evidence is a bubble in the paint or a rust streak from a rivet head.
The other high risk area is the rocker and wheel well line. School buses drain water out through paths in the floor and body sides that converters routinely seal over when they lay a new subfloor. Water that gets in through a roof penetration or a window now has nowhere to go and pools in the rocker channel. Repair means cutting out the corroded section back to sound steel, fabricating and welding in new material, treating the inside of the cavity, and restoring a drain path so the same thing does not happen again.
Collision Work and Painting a Converted Bus
Collision repair on a bus body is closer to truck work than to RV work. Panels are steel over steel ribs, and the correct repair is to cut out damaged skin, straighten or replace the affected ribs, and weld in new skin with matching rivet lines where the original was riveted. Where a conversion has added structure inside, such as a bed frame welded to the ribs or a cabinet bonded to the skin, we document and disconnect it before pulling, because leaving it attached transfers pull force into the interior build.
Paint is the part owners underestimate. A 35 foot bus is a lot of surface area, and most conversions get a single stage or basecoat clearcoat finish over a body with hundreds of rivet heads, seams and repaired areas. Preparation is the whole job. Blasting or sanding to sound substrate, correct etch and epoxy priming on bare steel, seam sealing, then block work before any color goes down. A full refinish on a converted bus runs into the upper end of our paint band for exactly that reason.
- Skin panel replacement
- Damaged panels cut out at rib centerlines and replaced with new steel, with the original rivet pattern reproduced. Filling large dents on a ribbed panel produces a wavy reflection no matter how well it is blocked.
- Rib straightening or replacement
- Bent ribs behind a damaged panel have to be pulled or replaced before new skin goes on. A new panel over a bent rib telegraphs the bend as soon as the sun hits it at an angle.
- Bare steel priming
- Etch primer then epoxy on any bare steel, with seam sealer at every lap. Skipping the epoxy step on a coastal vehicle guarantees rust blooming under the new paint within two years.
- Interior build disconnection
- Beds, cabinets and framing welded or bonded to the body get released before structural pulls. Otherwise the pull force goes into the interior build and cracks joinery a long way from the damage.
What Conversion Work Costs
Body and paint labor is $210 per hour, mechanical and electrical is $260 per hour and diagnostics run $285 per hour with a one hour minimum credited to the repair. Rust repair pricing is driven almost entirely by how far the corrosion runs once the panel is opened, which is why we cut an inspection opening before quoting rather than pricing from photographs. A rocker section on one side is a very different job from both rockers plus the wheel wells and the floor edge.
Refinishing a bus conversion typically lands between $8,000 and $30,000 depending on length, prep condition and whether the roof and underskirt are included. If the bus is currently wearing a brush applied or roller applied coating, budget more for removal than for paint. We are an independent shop and we will tell you honestly when a partial refinish is the better value, which on a driver quality conversion it often is.
What This Costs at Our Posted Rates
Body and paint labor is posted at $210 per hour. Mechanical and electrical is $260 per hour. Diagnostics run $285 per hour with a one hour minimum that is credited back against an authorized repair. Ranges below reflect jobs we have actually completed.
| Line item | Range | Hours |
|---|---|---|
| Bus conversion collision repair | $1,500 to $50,000+ | 7 to 240 |
| Full paint refinish | $5,000 to $35,000+ | 40 to 250 |
| Rust cut-out and panel fabrication | $2,500 to $25,000+ | 12 to 120 |
| Water damage and subfloor repair | $750 to $15,000+ | 4 to 70 |
Ranges reflect real jobs we have run. Final figures come from a written estimate after we see the vehicle.
See the full rate card and estimate policy.
What Is Included
- Inspection openings cut to determine true corrosion and splice condition
- Roof raise splice evaluation and rework with proper sleeving
- Rust cut-out, fabricated panel welding and cavity treatment
- Drain path restoration in rockers and floor edges
- Plated window opening rework with proper sealing
- Skin panel replacement with reproduced rivet lines
- Etch and epoxy priming on all bare steel with full seam sealing
- Single stage or basecoat clearcoat refinish with block work
Questions We Get Asked
How do I know if my roof raise was done correctly?
You cannot tell from the outside once it is painted. We pull interior finish at two or three points along the splice line and look at how the ribs were joined. Sleeved and double welded splices are sound. Plain butt welds are not, and they crack at the same height across multiple ribs. We give you photographs of what we find before recommending anything.
Why is painting a skoolie so expensive?
Surface area and preparation. A 35 foot bus body has hundreds of rivet heads and seams, usually some bare metal repairs, and often a previous roller applied coating that has to come off. Bare steel needs etch and epoxy priming and every lap needs seam sealer before color. A full refinish typically lands between $8,000 and $30,000 depending on condition and length.
Can you fix rust in the rocker panels and floor edge?
Yes. We cut back to sound steel, fabricate and weld in new material, treat the inside of the cavity, and restore the drain path that the conversion blocked. Pricing depends entirely on how far the corrosion runs once opened, which is why we cut an inspection opening before quoting rather than working from photographs.
Do you work on owner built conversions or only professional ones?
Both. We are an independent specialty shop and we see far more owner built conversions than professional ones. The practical difference is documentation. On owner builds we budget more diagnostic and inspection time because there are no drawings, and diagnostics run $285 per hour with a one hour minimum credited to the repair.