Category S write-off
Also known as: Cat S, Cat S write off, structural write-off
Category S means a UK vehicle has been written off due to structural damage but has been (or can be) repaired and legally returned to the road.
Cat S was introduced in October 2017 to replace the older Cat C classification. It applies to vehicles with damage to the structural frame, chassis or crumple zones — damage that affects how the car will perform in another collision, but which can be professionally repaired.
A Cat S vehicle is legal to drive once repaired and re-registered with DVLA. However, the write-off marker stays on the vehicle's record permanently. Insurance premiums on Cat S vehicles are typically higher, and the resale value is generally 20–40% below an equivalent vehicle with no write-off history.
Cat S vehicles can be a legitimate purchase if the repair quality is verifiable and the price discount reflects the marker. They should never be a surprise — always run an HPI or provenance check before committing to buy.
Related terms
- Category A write-offCategory A is the most severe UK insurance write-off classification — the vehicle must be scrapped in its entirety with no parts salvaged for re-use.
- Category B write-offCategory B is the second-most-severe UK write-off — the body shell must be destroyed but salvageable mechanical parts may be sold for use in other vehicles.
- Category N write-offCategory N means a UK vehicle has been written off due to non-structural damage — cosmetic, electrical or component-level — and can be repaired and legally returned to the road.
- HPI checkAn HPI check is a UK vehicle history report that confirms whether a car is stolen, has outstanding finance, has been written off, has mileage discrepancy, or has had its plate, colour or keeper details changed.