Category S and N write-offs explained

1. Understand what categories S and N mean

Category S means the vehicle suffered structural damage that has since been repaired, while category N means the damage was non-structural, such as to trim, electrics or bumpers.

• Category S (previously Cat C) covers structural damage, meaning chassis, sills or load-bearing areas were affected
• Category N (previously Cat D) covers non-structural damage, meaning cosmetic or non-load-bearing components were affected
• Both categories mean the insurer judged repair uneconomical relative to the car's value, not that the damage was necessarily severe
• Neither category legally requires an engineer's report before the car returns to the road, unlike categories A and B history checks would show
• Check that the category shown on a history check matches what the seller has disclosed

2. Check the vehicle's full write-off history

A history check is the only reliable way to confirm a category marker, since a repaired car can look completely normal on the road.

• Run a full HPI-style history check using the registration and VIN to confirm any category marker
• Check the date the category was recorded against when you're told the damage occurred
• Look for a note of which insurer recorded the write-off, which can help if you want more detail
• Confirm the VIN on the report matches the VIN on the car and V5C exactly
• Check whether the car has multiple write-off entries, which increases the risk of compounded repair issues

3. Inspect the quality of a category S repair

Because category S involves structural damage, the quality of the repair is critical to the car's ongoing safety and should be checked carefully.

• Ask for photographic evidence or an engineer's report covering the repair work carried out
• Check panel gaps, paint match and underbody welding for signs of poor-quality repair work
• Check for even tyre wear across all four corners, since poor structural repair can cause misalignment
• Take the car for a test drive and check it tracks straight without pulling to one side
• Get an independent inspection that specifically checks structural alignment on a category S car

4. Check category N cars for hidden electrical or trim issues

Category N damage is non-structural, but that can still include significant electrical, airbag or interior repairs that need checking.

• Check all airbags, seatbelt pretensioners and warning lights function correctly if the damage involved a deployment
• Test all electrical systems, including infotainment, windows and lighting, for faults
• Check interior trim and seat fixings for signs of previous removal or replacement
• Ask what specifically caused the write-off, as insurers can total a car for damage as minor as a broken windscreen combined with age and value
• Check for a diagnostic scan report showing no stored fault codes

5. Factor the category into price, insurance and resale

Category S and N cars typically carry a lower resale value and can affect insurance premiums or availability, so this should be reflected in what you're prepared to pay.

• Get insurance quotes before buying, as some insurers charge more or decline cover for category S vehicles
• Negotiate the price down to reflect the write-off history, as these cars commonly sell for noticeably less than an equivalent non-write-off
• Ask your lender whether finance is available on a category S or N car, as some lenders restrict this
• Check the resale market for similar category-marked cars to understand realistic future value
• Keep all repair and inspection documentation to support a future sale or insurance claim

Frequently asked questions

Related guides

Related model faults