A repaired write-off can be tempting when used-car prices are high. The headline price is lower, the vehicle may look tidy, and the seller may say the damage was minor. The category marker is where the buyer needs to slow down.
UK write-off categories separate vehicles into Cat A, Cat B, Cat S and Cat N. Cat A and Cat B are not normal road-going purchase categories. Cat S and Cat N can return to the road, but they mean different things. Cat S involves structural damage. Cat N involves non-structural damage. The difference matters for safety, insurance and resale.
The write-off category guide explains those categories in practical language, including why Cat S is a more serious marker than Cat N and why the repair evidence matters. A buyer should not rely only on a fresh MOT or a clean-looking body panel. They should ask what was damaged, how it was repaired, and whether invoices or photographs support the story.
Coastal conditions add another reason to inspect carefully. Salt air and wet roads can accelerate corrosion, especially where repairs have disturbed factory protection. A vehicle with previous structural work deserves a careful underside inspection, panel-gap check and test drive. Any signs of uneven tyre wear, poor alignment, water leaks, warning lights or mismatched paint should be treated as evidence to investigate, not bargaining theatre.
Insurance should be checked before purchase. Some insurers will quote for Cat S or Cat N vehicles, but not all will offer the same terms. The resale marker is permanent, so the discount the buyer gets today is likely to be demanded again when they sell.
The ABI salvage code was updated in 2025, reflecting the increasing complexity of modern vehicles. For a coastal buyer, the official category is only the start of the check. The underside, seams, repairs, alignment and water ingress all need attention because a vehicle can look tidy from outside while still carrying risk underneath.
Buying a repaired write-off is not automatically a bad decision. Buying one without understanding the marker is. The right question is whether the saving is large enough to justify the inspection, insurance and resale risk.