What goes into our valuations?
We receive car auction sale observations from The National Association of Motor Auctions (NAMA) every month and retail observations from UK's leading car advertising portals.
Our team of Car Editors meet with customers, motor trade experts, manufacturers, dealers and auctioneers as well as car rental companies and leasing and contract hire customers.
We've also got history, more than 80 years of it in fact, and all the learnings and experience passed n through the generations go into our valuations. Our current Editorial team on their own have over 200 years' experience in the automotive industry. They might not all qualify as ‘classics', but they certainly know their stuff.
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Our valuation process
Our valuation process is vital, and our monthly Editorial meeting is the focal point of the process. It's a forum where the team discusses everything they've seen in the market, feedback from customers, auction houses, dealers, fleet managers and more.
An agreed valuation policy is agreed and applied to the data as a whole, usually in the form of what the average depreciation percentage should be. We also highlight strong performing sectors, manufacturers or models that are exceptions to the rule and adjust them accordingly.
Every market sector is considered with the same care and attention. This means values from the initial forecasts of pre-production models through to the used values of the oldest cars have been considered by our highly experienced team.
Glass's uses a valuation tool developed over many years that utilises a primary/secondary model structure. This is the absolute start point of the valuation process, having the right curve in place to detail the correct rate of depreciation. We overlay the previous months' market activity, high quality econometric factors and short term market sentiment, to create a comprehensive set of reliable, justifiable and high quality market information.
At every point, our Editors will manually make changes to the data and values when necessary. Our Editors also review and correct any anomalies in the data ‘by hand' before the final values are set. Each month, we accurate value over 50,000 models. You can see how accurate we've been each month in the interactive chart below.
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How accurate are we?
Giving you the full picture
We will always compare ourselves to the market on EVERY vehicle we can. This usually means 60,000 to 80,000 a month.
We will never cherry pick a small section of observations to make us look more favourable; we'd be lying to ourselves and more importantly, you. We have customers specialising in every area of the market so we need to be just as accurate on late plate, low mileage cars as we are on ten year old, high mileage vehicles. Accuracy matters to us, but it matters more to you.
How do we measure accuracy?
- Trade observations are received from NAMA and matched to the relevant Glass Code
- Our standard mileage Glass Trade figure is identified from our latest valuation data set
- The Glass Trade figure is adjusted to the exact mileage figure of the observation
- Auction hammer price is compared to the mileage adjusted Glass Trade value
We then look at the average overall accuracy figure, which is the trade value against the observed auction price – the closer to 0%, the more accurate we are.