When a Tesla arrives at a body shop after a crash, the old idea of "sheet metal and paint" no longer fits. The company’s latest models use only 16% conventional steel in their bodywork, a figure that would have seemed impossible twenty years ago. Aluminum makes up 39%, while high-strength or ultra-high-strength steels account for another 45%. This mix goes beyond a technical detail: it is changing how cars are repaired, which repairs are possible, and how much protection people get in a collision.
Car construction has shifted dramatically, information from a Solera analysis of 200 models. In 2005, most cars were built almost entirely from standard steel panels. Now, the picture is more complicated. Korean brands still use conventional steel for 69% of their bodywork, but have increased the share of high-strength steel to 26%. European makers in the study are even more traditional, with 83% of their car bodies still made from regular steel. Tesla, though, has pushed the shift further than any other automaker, information from data cited by Google/SpainAuto.
In recent public materials on the Cybercab/robotaxi, Tesla confirmed a move to even more radical construction: exterior panels made of unpainted plastic and production using the 'unboxed' scheme.
This goes beyond swapping one metal for another. Each part of a modern car is designed for a specific job: some areas are meant to crumple and absorb energy, while others stay rigid to protect passengers. High-strength steels sit at basic points to handle hard impacts. Aluminum helps cut weight without sacrificing strength. The result is a patchwork of metals, each chosen for its own qualities and requiring a specific repair approach.
For repair shops and owners, these changes are already making a difference, and sometimes driving up costs. A dented steel panel once could be hammered out and repainted. Now, with high-strength and ultra-high-strength steels, old repair methods can weaken the safety features these materials are designed to provide. Tesla’s manuals are clear: minor cosmetic damage to high-strength steel can be fixed cold, but any serious bend means full replacement. Ultra-high-strength steel has stricter rules: repairs need special approval and are allowed only in certain spots.
Not every brand or region is moving at the same speed. The rules and materials vary, complicating repairs for drivers and shops. As a recent report notes, Spain is already seeing more failed vehicle inspections as old repair habits clash with new car designs.
Modern bodies built with high-strength and ultra-high-strength steel, aluminum, adhesives, and rivets require repair shops to follow manufacturer procedures strictly. There is no universal 'pull and paint' approach for these vehicles; repair mistakes can affect the structure and its ability to absorb energy in a subsequent crash.
For drivers, these changes mean more than better crash protection. Repairs are getting more complex and often more expensive as advanced materials become standard. The days when every dent could be fixed with a hammer are nearly over. Owners now face repairs that demand specialized skills, with full part replacements sometimes the only option. Tesla and other brands are leading this shift. The next big challenge is ensuring repair standards and skills keep pace with the new materials already on the road.
