Understanding Cat S and Cat N Cars – What You Need to Know

Cat S and Cat N are insurance write-off categories. A Cat S (Structural) car has structural damage to its frame or chassis and must be re-registered with the DVLA once professionally repaired. A Cat N (Non-Structural) car has cosmetic or electrical damage only, was uneconomical for the insurer to repair, and does not need re-registration.

If you are browsing used cars or thinking about selling one, these labels matter. A write-off category stays on the vehicle record for life, affects resale value and insurance, and tells you what kind of damage to look into before you buy.

Cat S: structural damage

Cat S means the damage reached the structural frame or chassis. These cars can be repaired and put back on the road, but the repair must be done properly and the car re-registered with the DVLA. Always ask for evidence of the repair work and consider an independent inspection before purchase.

Cat N: non-structural damage

Cat N covers cosmetic, electrical or other non-structural damage. The structure is sound, but the insurer decided repair cost more than the car was worth. No re-registration is needed, but electrical faults can be awkward, so check everything works before you buy.

What this means for buyers

Write-off cars can offer real savings, but only if you know what you are getting. Check the repair quality, request inspection reports, and confirm the category on the vehicle history check. If the price looks too good, the category is usually why.

What Partsworth does with Cat S and Cat N cars

At Partsworth we buy Cat S and Cat N vehicles and dismantle them responsibly in Doncaster. Usable parts, engines and components are inspected, tested where possible, and resold as genuine used parts with 30-day returns. That keeps good parts in use, gives UK drivers an affordable alternative to new, and reduces waste.