Guide
Classic car body restoration cost: corrosion is the unknown
Updated
Bodywork and paint are usually the largest part of the bill, and the part that most often costs more than expected. Both facts have the same cause.
You cannot price rust you cannot see
Classic bodies rust from the inside out, in box sections, sills, closing panels, floors, chassis rails, spring hangers, A posts and inner wings. A car can look presentable and be structurally poor, and a previous restoration can hide as much as it fixed: filler over a repair, a sill welded over a rotten inner, a jacking point patched rather than replaced. None of that is visible until paint, underseal and trim are removed. This is why any bodywork estimate given before strip-down should be treated as a starting position rather than a price.
Stage the assessment
- Strip. Trim, glass and fittings out, so the shell can be seen.
- Remove the paint. Media blasting, chemical dipping or hand stripping, chosen for the car and the panels. Dipping reveals everything but has its own considerations for a shell with box sections.
- Photographed report. Every area of corrosion identified, with what is proposed for each: repair section, fabricated panel, or full panel replacement.
- Revised estimate. A realistic number for the metalwork, now based on evidence.
- Then decide. This is the point at which some owners rescope, some carry on and a few sell the car. All three are reasonable, and it is far better to reach that point with a report in front of you than two thirds of the way through the welding.
Repair panels, fabrication and why it matters
For well supported marques, pressed repair panels and even complete body shells may be available, which makes the work faster and more predictable. For others, sections have to be fabricated by hand from sheet, which is a skilled craft charged accordingly. Ask which parts of your car fall into which category before you compare quotes, because two restorers can be pricing very different amounts of hand fabrication. Ask also how the repairs will be made and protected: how joints are made, and how box sections are treated and sealed once closed up, since that decides whether the work lasts.
Paint cost is preparation cost
- Preparation dominates. Filling, blocking, priming, flatting and repeating is what produces flat panels and straight reflections. The spraying itself is a small share of the hours.
- Bare metal or over existing. Going to bare metal is more work and the only honest option on a car with unknown paint history, but it also removes any doubt about what is underneath.
- Colour and finish. A colour change means jambs, boot, bonnet underside and door shuts. Some period finishes and modern multi-stage paints take more coats and more flatting.
- The standard. A good driver-standard finish and a concours finish differ mostly in how many hours went into flatting and polishing before anyone looked at it in daylight.
- Detailing after paint. Refitting trim, glass, seals and brightwork without marking the new paint is careful work and belongs in the estimate.
Questions to ask before authorising metalwork
- Which areas are being repaired with pressed panels, which with fabricated sections, and which are being left?
- How will the joints be made, and how will enclosed sections be protected before they are closed up?
- Is the shell going on a rotisserie or jig, and is alignment being checked as it goes?
- How many stages of preparation are included in the paint price, and to what standard?
- What is excluded, in a written list?
Get the post-strip report in writing with photographs before authorising metalwork. It is the single most useful document in the whole project and it is the point at which the real cost of the restoration first becomes knowable.