Guide
Interior Grade vs Exterior Grade: Checking Both Before You Buy
Short answer: The overall (exterior) grade is a number (1–6, plus S/R); the interior grade is a separate letter (A–D or A–E). A car can have a strong exterior grade and a poor interior grade, so read both.
Ask a buyer what grade a car received at auction and most will quote a single number — 4, 4.5, or similar. What they're usually quoting is the overall exterior grade. Sitting right alongside it, and often overlooked, is a separate interior grade that can tell a meaningfully different story about the same car.
Two Grades, Two Different Jobs
The overall grade (typically 6 down to R) is primarily a bodywork and general condition assessment. The interior grade, usually A through E, is a distinct evaluation of the cabin specifically: seat wear, dashboard condition, carpet and headliner cleanliness, and general smell and hygiene. They're recorded separately because they genuinely measure different things, and a car doesn't need to score similarly on both.
Why They Often Diverge
A car can rack up interior wear — through age, previous use as a rental or company vehicle, or simply a lot of time spent occupied — without any of that showing on the bodywork. Conversely, a car with cosmetic exterior damage from a minor prior incident can have a spotless, barely-used interior if it was privately owned and garaged. The two grades move somewhat independently, which is exactly why they're recorded as two separate fields rather than blended into one score.
A Strong Exterior Grade With a Weak Interior Grade
This combination shows up often enough on ex-fleet, ex-rental, and higher-mileage vehicles that it's worth actively checking for rather than assuming. A car graded 4.5 overall with a C or D interior grade might present beautifully in photos of the exterior while needing seat repair, a full detail, or odour treatment once it arrives — costs that don't show up anywhere in the headline number most listings lead with.
A Weak Exterior Grade With a Strong Interior Grade
Less common but not rare: a car with a lower overall grade due to visible panel damage or repair history, paired with a genuinely well-kept interior. For buyers prioritising cabin comfort and willing to accept cosmetic exterior imperfections — or planning bodywork regardless — this combination can represent solid value that a buyer scanning only the headline grade might pass over.
How to Check Both Properly
When reviewing an auction sheet, treat the interior grade as a mandatory second data point, not an optional extra:
- Locate both grade fields — they're usually adjacent but recorded as separate figures
- Read the comments section for any interior-specific notes (smell, tears, non-original trim)
- Weigh both grades against what actually matters to you — a buyer who'll drive the car daily should weight the interior grade more heavily than a buyer restoring it for occasional use
The Takeaway
A single-number summary of "the grade" is a simplification that loses real information. Checking the exterior and interior grades as the two separate assessments they actually are gives you a materially better sense of what you're buying, and it costs nothing extra — the information is already sitting right there on the sheet.
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