A clear UK guide to Category S write-offs, risks, and whether they’re good value
Buying a used car that has been written off can feel risky — especially when it’s listed as a Category S (Cat S) insurance write-off. These cars are often cheaper than normal, but the lower price comes with important considerations.
In this guide, we explain what a Category S car is, the risks involved, and whether buying one can actually make financial sense.
A Category S car is a vehicle that has been written off by an insurer due to structural damage. This could include damage to:
Category S replaced the old Category C classification in October 2017. Unlike Cat A or Cat B vehicles, a Cat S car can be repaired and legally returned to the road.
👉 Learn more in our full guide to Category S write-offs explained.
Category S cars usually sell for less because:
Even after professional repairs, the write-off marker remains on the vehicle’s history forever.
Not all repairs are carried out to a high standard. Poor structural repairs can affect safety, handling, and long-term reliability.
Some insurers charge higher premiums or request evidence of professional repairs.
Even years later, Category S cars are worth less than equivalent non-written-off vehicles.
A Category S car can be worth buying if:
Many buyers save money by choosing a well-repaired Cat S vehicle with full transparency.
Running a vehicle history check helps confirm whether the damage has been disclosed honestly.
👉 Run a free car history check to see if a vehicle has been written off.
A Category S car isn’t automatically a bad purchase — but it does require extra checks, realistic pricing, and full transparency.
If the repairs are professional and the price reflects the write-off status, a Cat S car can offer good value.
Just make sure you understand the risks before you buy.