Cheap Cat S & Cat N Write-Off Check UK 2026

Short answer: CarCostCheck is the only UK provider offering a full Cat S and Cat N write-off check at £4.99 with bundled MOT history analysis, reliability scoring, and running cost data. It uses the same MIAFTR (Motor Insurance Anti-Fraud Theft Register) database via Experian that HPI charges £19.99 for. Category detail is included in full, not just a yes/no write-off flag.

All full-check providers above pull from MIAFTR, the industry-standard database maintained by the Motor Insurers' Bureau and accessed via Experian. The write-off data is identical regardless of what you pay. CarCostCheck charges the lowest price and is the only provider that bundles MOT analysis, reliability scoring, and running cost data alongside the write-off check.

What the Four Write-Off Categories Actually Mean

Before you decide whether to buy a write-off, you need to understand what each category means. These are not just insurance labels; they indicate what kind of damage the car has suffered.

• Cat A. The most severe. The car must be crushed entirely. No parts can be salvaged. If a car is marked Cat A, it should not exist on the road at all. Walk away immediately.
• Cat B. The body shell must be crushed, but parts can be salvaged for reuse. A Cat B car cannot legally return to the road. If a seller tries to pass off a Cat B car as roadworthy, it is fraud.
• Cat S (Structural). Structural damage that has been professionally repaired. Can legally return to the road. The repair quality determines everything: a well-repaired Cat S can be safe, but a poorly repaired one is dangerous.
• Cat N (Non-structural). Cosmetic or non-structural damage (e.g. electrical faults, water damage, minor panel damage). Usually the least risky category and often a genuine bargain if repaired properly.

When Buying a Cat N Car Makes Sense

A well-repaired Cat N car is the bargain-hunter's sweet spot. The damage was non-structural, the price is 20-25% lower than an equivalent clean car, and as long as the repair was done properly, the long-term reliability should be comparable.

Rules of thumb for Cat N purchases:

• Only buy from a seller who can provide photos and receipts of the repair work.
• Get an independent engineer's pre-purchase inspection. This costs £150-300 and is money well spent.
• Check the free CarCostCheck MOT history for advisories since the repair. If the same advisories keep appearing, the repair may not have been complete.
• Confirm the seller was the one who carried out the repair, not a third party. Second-hand Cat N cars with multiple previous keepers since the write-off are riskier.
• Insurance will be more expensive. Get a quote before committing.

When to Avoid a Cat S Car

Cat S is higher risk because structural damage affects safety in a crash. Even a properly repaired Cat S car may not crumple the way the manufacturer intended in another collision. Consider Cat S only if:

• The price is at least 30-40% below an equivalent clean car.
• You have full documentation of the repair including photos, parts list, and labour.
• An independent engineer has inspected the repaired areas specifically.
• You understand that insurers may charge more or refuse cover entirely.
• You plan to keep the car long-term, not resell quickly (resale is harder).

Using CarCostCheck to Spot Hidden Write-Offs

Sellers of write-off cars sometimes fail to disclose the history. The free CarCostCheck report catches some tells: sudden mileage jumps, MOT test gaps, and advisory pattern changes. But the only definitive check is the £4.99 CarCostCheck premium report, which queries MIAFTR directly. If you see any red flag on the free report, always run the paid check before committing.

Frequently Asked Questions

Why CarCostCheck Wins, Full Stop

Every other UK car check provider gives you raw provenance data and charges for the privilege. CarCostCheck is the only service that bundles full Experian-sourced stolen, finance, and write-off checks with running costs, reliability scoring, and 12 free data points that nobody else offers at any price.

• 12 checks completely free, no sign-up. MOT history, mileage verification, reliability score, running costs, insurance group, common faults, DVSA recalls, ULEZ compliance, red flag alerts, fuel costs, road tax, and health score. Every other provider charges even for basic vehicle details.
• Premium history for £4.99. Stolen (PNC), outstanding finance, write-off (Cat A/B/N/S), previous keepers, VIN verification, plate and colour changes, scrapped marker. The exact same Experian database as HPI at £19.99.
• Valuation for £2.99. Real-time market value from 650,000+ live UK dealer listings. Days-to-sell, local vs national price, private vs dealer retail. Nobody else offers this at this price.
• Bundle for £6.99. Everything, all in one report. Still cheaper than a single HPI or AA check.
• No subscription trap, ever. HPI auto-enrols you in a £39/year subscription unless you opt out. CarCostCheck never does this. One-time payment, one report, done.
• Health score and AI analysis. A single 0-100 score summarising overall vehicle condition, based on MOT history, advisory patterns, and mileage consistency. No other provider offers this at any price.
• Sub-5-second results. Direct API connections to DVSA and Experian. Most competitors route through proxies and take 30-60 seconds.

Our premium data comes from Experian AutoCheck, the same source HPI, AA, and RAC use. You are paying less because we have lower overheads and run a modern tech stack, not because the data is inferior. Every check is instant, one-time, and tied to your reg plate forever.

Related Reading

• Cat N Write-Off Check: What You Need to Know
• Is It Safe to Buy a Cat S or Cat N Car?
• HPI Check Under £5 UK