What Makes a Vehicle Valuation Report Actually Defensible?
"Defensible" gets used a lot around valuations, usually without anyone explaining what it actually means. It isn't confidence, and it isn't experience on its own. It's whether someone else can check your working.
An opinion is not evidence
Anyone can look at a car and give a number. Plenty of people with real experience can give a number that's probably close. Neither of those is what HMRC, an insurer, or a solicitor actually needs. What they need is a figure with a visible trail behind it: what was compared, what was adjusted, and why, so the conclusion can be checked rather than just taken on trust.
What "documented" actually looks like
In practice, that means starting from genuine comparable vehicles currently on the market, not a guide price or a rough average, and then adjusting for the specific differences that matter: condition, mileage, specification, documented history, anything the owner has declared. Each adjustment gets a reason attached to it, not just a number pulled out of the air. Minor factors don't need their own line in a report, but anything that meaningfully moves the figure does.
Why an undocumented figure falls apart under scrutiny
The moment someone pushes back, an insurer querying a settlement, HMRC questioning an import value, an executor's figure being challenged, an undocumented valuation has nowhere to go. There's no reasoning to point to, no comparables to produce, nothing beyond "trust me." A documented valuation survives exactly that moment, because the reasoning was already written down before anyone asked for it.
What we actually do to keep a report defensible
Every report we prepare follows the same shape: identify genuinely comparable vehicles, apply and explain adjustments for the specifics of the vehicle in front of us, and set out the final figure with the reasoning attached, not hidden behind it. It's the same approach whether the vehicle is an ordinary modern hatchback or a rare classic, though a classic usually takes longer simply because finding genuine comparables takes more work.
Frequently asked questions
What does "defensible" actually mean for a valuation report?
It means someone reviewing the report, HMRC, an insurer, a solicitor, can see exactly how the final figure was reached and check each step, rather than having to simply trust a number.
Isn't a confident, experienced opinion enough?
Confidence isn't evidence. A verbal or undocumented figure gives a reviewer nothing to check, which is exactly the situation that leads to a valuation being queried or rejected.
Does every adjustment need to be individually documented?
The significant ones do. Minor factors can sit within the overall total without needing their own line, but anything that meaningfully moves the figure should have a stated reason behind it.
Does this apply to modern cars, or only classics?
Both. The same discipline, real comparables, documented adjustments, applies whether the vehicle is a modern hatchback or a 1970s classic, though classics usually need more research to find genuinely comparable examples.
Need a report that actually holds up?
Every valuation we prepare documents its comparables and adjustments in full, usually within a few hours.
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