How to Value Used Plant and Machinery Before You Bid

Written By Pavel Uncuta
How to Value Used Plant and Machinery Before You Bid
How to Value Used Plant and Machinery Before You Bid

Cover: Freepik via Magnific (see credits.csv)

Quick answer

This is a buyer's pricing method, not a formal or professional valuation of any particular machine. It uses three reference points: recent comparable sold prices, current retail or dealer asking prices, and trade or auction-book values. Sold prices normally carry the most weight because they record what someone paid. Build a comparable set on make, model, year, hours and spec, adjust for the differences, then work backwards from resale or utilisation value, taking off repairs, transport and your margin and dividing out the buyer's premium and any internet surcharge, to reach a maximum hammer bid you write down and hold to.

How do you value a used machine before you bid?

By triangulation rather than a single number. You take three reference points, recent comparable sold prices, current retail or dealer asking prices, and trade or auction-book values, then reconcile them against the specific machine in front of you. This is a pricing method for your own bidding, not a formal or professional valuation. The output is a maximum hammer bid, written down before the lot opens, that you will not pass.

Most buyers do this backwards: they see a lot, decide they want it, then work out what they can stretch to while the clock runs. The order that holds up is the reverse. Price the machine cold, convert that into a ceiling, and let the ceiling decide whether you bid at all. Browse the lots on our plant machinery auctions page and you will see the same model at very different years, hours and specifications, which is why a headline price for "a 5-tonne excavator" is close to useless. This guide is about the number. For the process itself, see our guide to buying plant and machinery at auction.

Two things to be clear about before you start. Universal Auctions Group Ltd acts solely as auctioneer and agent for the vendor, does not inspect the machinery and does not warrant its condition, hours, specification, description or value. And our auctions are trade-only: bidders must carry out their own valuation, inspection and due diligence before bidding. Nothing in this guide replaces that work, and a figure produced from this method is only as reliable as the quality, comparability and accuracy of the information you put into it.

Why do recent sold prices usually beat dealer asking prices?

An asking price is an opening position. A sold price records a completed transaction, so it is evidence rather than aspiration. Dealer asking prices often sit above trade value, though how much preparation, warranty, overheads or negotiating room they include varies between dealers and between individual machines. Use sold results to set your number, and use asking prices to sense-check the ceiling you would be competing against on resale.

  • Recent comparable sold prices. Results from auctions and trade disposals in the last few months, normally weighted highest. Older results drift as demand, emissions rules and interest rates move.
  • Retail and dealer asking prices. Useful for what a prepared machine may command, but what is included varies by dealer and by machine. Treat the advertised figure as an untested ceiling, and remember it may have been sitting unsold for months.
  • Trade guides and auction-book values. A sense check on the middle of the range for common models. They are averages, so they cannot see the attachments, undercarriage or service file on your lot.

Two cautions on sold results. Published auction results may represent hammer prices only, and may exclude the buyer's premium, any internet surcharge, VAT, transport and repairs, so a headline result is not the buyer's total cost. And a recorded result does not always confirm that the transaction was completed and paid for. Compare like with like: VAT status, buyer charges, location, condition, attachments and whether the sale actually completed all need to be on the same basis before two numbers can be set side by side.

When the three reference points disagree, the sold prices normally carry most weight and the other two help explain the gap. A book value well below recent sold results may mean demand has moved faster than the book. A dealer price far above both may reflect preparation and warranty, which you are not buying at auction. Watching completed results across several sales rather than a single week is the cheapest research a buyer can do, and our guide on how online industrial bidding works explains how timed sales close and where those results come from.

How do you build a comparable set and adjust for the differences?

Start with the tightest match you can find, the same make, model, year, hours and specification, then widen until you have a usable set. Perfect matches are rare, so the skill is in adjusting: add for a machine with better hours or a full attachment package, deduct for tired tracks, a missing quick-hitch or a bare cab. Those adjustments are subjective estimates unless they are supported by professional valuation evidence, so write each one down with your reasoning.

  1. Fix the exact model and variant. A 3.5-tonne and a 5-tonne machine are different markets, and so are two variants of the same nominal weight with different arms or booms.
  2. Match year and hours together. Year sets the emissions stage and the generation. Hours indicate how much work it may have done. A low-hours older machine and a high-hours newer one are not the same asset.
  3. List the specification line by line. Cab or canopy, aircon, quick-hitch, thumb, piped hydraulics, blade, rubber or steel tracks, telematics. Each carries money.
  4. Count the attachments. Buckets, breakers, forks and grabs sold with the machine are often the difference between two results that otherwise look identical.
  5. Aim for four or five results as a useful target. A single outlier tells you almost nothing. In specialist markets a larger or a smaller evidence set may be appropriate, so treat four or five as a working aim rather than a reliable minimum.
  6. Adjust and record. Take the mid-point of the cluster, add or deduct for each difference against this machine, and keep the working.

Where a listing is thin, the gaps are part of the exercise. We list lots from the vendor's own details and photographs, so if hours, service history or the attachment list are not stated, make further enquiries, arrange an inspection, and include an appropriate risk allowance for what you still cannot confirm. Hour-meter readings may be unverified and must not be treated as warranted operating hours unless the listing expressly confirms it. Viewing is strictly by prior appointment and is strongly recommended.

Which price drivers actually move used plant values?

Hours against age, make and model desirability, attachments, undercarriage or tyre life, emissions stage, service history and cab specification all contribute. Two machines of the same year and model can sit thousands apart on those points. No single factor decides the number on its own: condition, maintenance, specification and market demand have to be considered together, and whether the machine starts, runs and moves under its own power is a significant unknown to price because a non-runner is a repair project with an uncertain bill.

A used tracked excavator on a yard with its undercarriage and tracks visible, the kind of detail that drives valuation
Undercarriage life, hours against age and the attachments included often matter more to a machine's value than the headline model name.
  • Hours against age. What to look at: Recorded hours compared with what that year might normally show. How it can affect the number: Low hours for the year can support value and high hours can reduce it, but only read alongside condition, maintenance and specification.
  • Make, model and demand. What to look at: How readily the model resells and how easily parts and dealers are found. How it can affect the number: Strong models tend to hold value; less common models may take a discount for resale risk.
  • Attachments and buckets. What to look at: Buckets, breaker, forks, grab, quick-hitch, thumb, piped hydraulics. How it can affect the number: Adds directly, and a bare machine costs real money to make useful again.
  • Undercarriage or tyres. What to look at: Remaining track, sprocket, idler and roller life as a percentage; tyre tread and sidewalls. How it can affect the number: A worn undercarriage can be one of the largest single deductions on a tracked machine.
  • Emissions stage. What to look at: The engine stage for the machine's year and the rules applying to the sites you intend to work on. How it can affect the number: Site-access requirements vary, so a machine that cannot work on some sites may have a narrower resale market.
  • Service history and telematics. What to look at: Service file, greasing evidence, hour logs, telematics records where available. How it can affect the number: Documented history supports the top of your range; absent history widens the risk band.
  • Cab spec and starts-and-runs. What to look at: Cab or canopy, aircon, seat and glass, plus whether it starts, runs and tracks. How it can affect the number: Spec adds; a non-runner changes the pricing method entirely.

Emissions and site access deserve their own thought. Requirements vary by location, by project and by operator, and they change, so check the current rules that apply to the sites and jobs you intend the machine for rather than assuming a national standard. That is a market restriction rather than a fault, and it belongs in the number. The physical inspection points behind these drivers are set out in our guide to buying used excavators and telehandlers at auction.

How does depreciation shape a used machine's value over time?

Plant typically loses value faster in its early years and then flattens, though the shape varies by machine, make, model and category. That pattern matters because on a used machine the steepest part has already been paid for by someone else. It is also why specification, hours and history can separate two machines of similar age by a long way.

Line chart showing two illustrative depreciation curves over eight years, a well-specced low-hours machine falling from one hundred percent of new price to about forty-one percent, and a bare high-hours machine falling from one hundred percent to about twenty-four percent
Illustrative only. This does not represent a standard depreciation pattern for every machine, make or category. Actual retained value varies by sale, lot, model, hours, specification, condition and market.

The two illustrative curves start together and end a long way apart. Specification, hours and history separate them, which is why the year alone tells you relatively little. A well-specced older machine with decent undercarriage and a service file can compare favourably against a bare newer machine at the same money, because you are not immediately spending on the kit that makes it work, but that depends on both machines rather than being a rule. Price the machine you are actually getting, including everything that comes with it.

How do you turn your pricing into a maximum hammer bid?

Work backwards, and divide the percentage charges out rather than deducting them as fixed figures. Start from what the machine is realistically worth to you once it is working, either resale value or what it saves you in hire. Take off repairs and refurbishment, transport to your yard, and the margin or contingency you need. That leaves the money available for the hammer price plus the percentage buyer charges, so divide it by one plus the buyer's premium rate plus the internet surcharge rate. The answer is your maximum hammer bid.

Branded four-step diagram showing valuation converted into a maximum bid: resale value, deduct costs, deduct margin, divide out the buyer's premium
Four steps from a priced machine to a bid ceiling: start at resale or utilisation value, take out costs, take out margin, then divide out the percentage buyer charges rather than subtracting them.
  • Realistic resale or utilisation value, working and ready. Illustrative figure: ¬£24,000. Running ceiling: ¬£24,000.
  • Less repairs and refurbishment. Illustrative figure: ¬£1,800. Running ceiling: ¬£22,200.
  • Less transport to your yard. Illustrative figure: ¬£500. Running ceiling: ¬£21,700.
  • Less your margin and contingency. Illustrative figure: ¬£3,000. Running ceiling: ¬£18,700.
  • Available for hammer price plus percentage buyer charges. Illustrative figure: subtotal. Running ceiling: ¬£18,700.
  • Divide by 1.18, being one plus an illustrative 15% buyer's premium and an illustrative 3% internet surcharge. Illustrative figure: √∑ 1.18. Running ceiling: ¬£15,847.
  • Maximum hammer bid you enter. Illustrative figure: ¬£15,847. Running ceiling: Hold to it.
  • Which produces a premium of about. Illustrative figure: ¬£2,377. Running ceiling: 15% of hammer.
  • And an internet surcharge of about. Illustrative figure: ¬£475. Running ceiling: 3% of hammer.

The percentages above are illustrative. The buyer's premium and internet surcharge that apply to a lot are stated on that lot's Additional Fees tab, so take the actual rates from there before you do this on a real lot, because they change the divisor. Note what division does that subtraction does not: deducting £2,377 and £475 as fixed figures from £18,700 would leave £15,848, which happens to be close here, but on a different starting figure or a higher premium rate a subtraction-based ceiling is materially too high, because the charges scale with whatever you actually bid.

Two points sit outside the table. VAT at 20% applies to the hammer price according to the individual lot's treatment, and to the premium and the surcharge, which on these figures is about £3,740. Whether that comes back is not automatic: recovery depends on your VAT registration, taxable business use, the lot's VAT treatment and your holding valid VAT documentation. Where those conditions are met the VAT is a cashflow item that you fund between paying the invoice and recovering it. Where they are not, it is a real cost and belongs in the deductions above. And transport is easy to under-price on anything heavy: send us the lot number and your postcode and we can obtain a no-obligation transport quotation before the auction ends, which turns a guess into a figure you can put in the sum. Transport and collection remain your responsibility unless separately agreed.

What do estimates and reserves actually mean?

An estimate is a guide to where a lot may sell, not a valuation of the machine and not a promise. A reserve is normally the seller's minimum, but it is not fixed: a reserve may be reduced, the seller may subsequently accept a provisional bid, or we may agree an alternative arrangement under the auction terms. Neither figure tells you what the machine is worth to you. Do your own arithmetic first, then look at the estimate to judge whether the sale is worth your time.

Where bidding does not reach the reserve, your highest bid may become a provisional bid, which can remain open for vendor acceptance during the period stated in our terms. So a lot that looks unsold at the close is not necessarily finished with, and the countdown ending is not automatically a completed sale.

Three further things follow. A lot can sell above its estimate, below it or not at all, and none of that means your pricing was wrong. A lot remaining unsold does not tell you it is mechanically sound or that it merely failed to reach reserve: it may remain unsold or be withdrawn for several different reasons. And lots can be withdrawn or suspended under the auction terms before or during a sale, so a listing you have priced up may simply disappear.

Why does the same machine make different money in different sales?

Because price is set by who is bidding on the day. The same excavator can make one number in a sale full of similar machines and another in a sale where it is the only one of its kind. The mix of lots, how well the sale is exposed to buyers, and the circumstances of each individual sale can all move a result without the machine changing at all.

  • Competing lots. Several similar machines in one sale draw on the same pool of buyers.
  • Only machine of its type. Where demand for that specification has one place to go, expect a firmer result and stick to your ceiling.
  • Overseas interest. Export buyers bid alongside UK trade on our sales.
  • Detail in the listing. Thin detail on hours, history and attachments widens the risk band, so widen your allowance.

We would not put a figure on how much any of those moves a price, because we have no sales data that would support one. Treat them as reasons a result can differ from your expectation rather than as adjustments to make in advance.

None of this is a reason to chase a lot. It is a reason to price more than one lot and keep your ceiling constant. But be careful how you act on that: every successful bid is separately binding and generally cannot be withdrawn, so leaving maximum bids on several substitute lots at once risks winning more than one and having to complete on all of them. Bid the first, then move to the next only once you have lost it. Where the stock comes from is worth understanding too, and we cover that in liquidation and insolvency auctions explained.

On timing, lots close at staggered published times, and where a valid bid is placed during a lot's final ten minutes that lot receives a ten-minute extension, repeating each time a further valid bid is accepted. So a lot you have priced can still be running well after its published end time.

When should you get an independent professional valuation?

For a single machine you know well, your own comparable set may be enough for your own bidding decision. An independent professional valuation earns its fee when the number has to satisfy someone else: a lender, an insurer, a board, an accountant or a set of creditors. It also helps on large mixed lots and unusual specialist kit where comparable sold results are thin.

An independent professional valuation can be arranged where one is needed. Remember that the method in this guide produces a buyer's pricing view rather than a professional valuation, and its reliability depends on the quality, comparability and accuracy of the information used. For most trade buyers on most lots, the discipline that matters more is the one you can do yourself: a written comparable set, a written adjustment list and a written maximum hammer bid you do not move once the lot is running.

Common mistakes to avoid

  • Pricing from asking prices. What an advertised figure includes varies by dealer and by machine. Anchor on completed sold results and use asking prices only as a ceiling check.
  • Comparing sold results on different bases. A published result may be a hammer price only, excluding the premium, surcharge, VAT, transport and repairs, and it does not always confirm the sale completed and was paid for.
  • Reading the estimate as a valuation. An estimate is a guide, and a reserve can be reduced or a provisional bid accepted later. Do your own number first.
  • Treating an hour reading as warranted. Hour-meter readings may be unverified unless the listing expressly confirms them.
  • Ignoring the undercarriage. Track, sprocket and roller life can be one of the biggest deductions on a tracked machine and it is easy to miss in photographs. Ask, or view.
  • Subtracting the buyer charges instead of dividing them out. The premium and surcharge scale with the hammer price, so a ceiling built by subtraction is too high.
  • Assuming a missing answer is the worst case. Where information is absent, make further enquiries, arrange an inspection and set an appropriate risk allowance rather than guessing at either extreme.
  • Moving your maximum while bidding. A ceiling you raise in the last minutes was never a ceiling. Write the number down before the lot opens and let it decide for you.

About this guide, and where to check the terms

Last reviewed 5 August 2026. This guide sets out a buyer's pricing method and is general information only. It is not a formal or professional valuation, and it is not legal, tax or financial advice. Every figure and percentage in it is illustrative. The terms of the individual sale govern the lot, so check them, and the lot's Additional Fees tab, before you bid.

  • Auction terms and conditions. Bidding, reserves and provisional bids, descriptions and hour readings, payment, viewing, collection and export: universalauctionsgroup.com/terms-and-conditions.
  • Buyer fees and VAT information. The buyer's premium and internet surcharge for a lot are stated on that lot's Additional Fees tab, and the fee and VAT provisions are in the auction terms.
  • Viewing arrangements. Strictly by prior appointment and strongly recommended. To arrange it on a lot, contact us.
  • Professional valuations. An independent professional valuation can be arranged where a figure has to satisfy a lender, insurer, board or creditors. Contact us to discuss it.
  • Current sales. Plant machinery auctions.

Universal Auctions Group Ltd, registered in England and Wales, company number 14944658. Registered office: First Floor Office 3, Hornton Place, London W8 4LZ. Telephone +44 (0) 330 332 5232. Email info@universalauctions.group. Universal Auctions Group Ltd acts solely as auctioneer and agent for the vendor and is not a party to the contract of sale, which is formed between the vendor and the successful bidder. We do not inspect the machinery and do not warrant its condition, hours, specification, description or value.

Frequently asked questions

Is this a valuation?

No. This is a buyer's pricing method for setting your own maximum bid, not a formal or professional valuation of any particular machine, and it should not be described as defensible in its own right: its reliability depends on the quality, comparability and accuracy of the information you use. We do not inspect the machinery and do not warrant its condition, hours, specification, description or value. Where a figure has to satisfy a lender, insurer, board or creditors, an independent professional valuation can be arranged.

What is the most reliable price reference for used plant?

Recent comparable sold prices normally carry the most weight, because a sold result records a completed transaction. Two cautions: published auction results may represent hammer prices only and may exclude the buyer's premium, any internet surcharge, VAT, transport and repairs, and a recorded result does not always confirm the transaction was completed and paid for. Dealer asking prices vary in what they include, and trade guides are averages that cannot see the undercarriage, the attachments or the service file on your lot.

How many comparable sales do you need before you can price a machine?

Four or five recent results is a useful target rather than a reliable minimum. One result tells you almost nothing, because it could be an outlier in either direction. In specialist markets a larger or a smaller evidence set may be appropriate. Make sure the results are compared on a consistent basis: VAT status, buyer charges, location, condition, attachments and whether the transaction actually completed.

Does an auction estimate tell you what a machine is worth?

No. An estimate is a guide to where a lot may sell, not a valuation of the machine and not a promise about the result. A lot can sell above its estimate, below it, or not at all. Work out your own number from comparable sold results first, then look at the estimate only to judge whether the lot is worth your time.

What is the difference between an estimate and a reserve?

An estimate is a published guide to the likely selling range. A reserve is normally the minimum the seller will accept, but it is not fixed: a reserve may be reduced, the seller may subsequently accept a provisional bid, or we may agree an alternative arrangement under the auction terms. Where bidding does not reach the reserve your highest bid may become a provisional bid, open for vendor acceptance during the period stated in our terms. A lot remaining unsold does not tell you it is mechanically sound, and lots can also be withdrawn or suspended under the auction terms.

How much do hours affect the value of a used excavator?

They are one factor, and only meaningful read alongside others. What matters is whether the recorded hours look high or low for that year, and how far the machine may be from its next major spend, but condition, maintenance, specification and market demand have to be weighed together rather than reading hours in isolation. Hour-meter readings may also be unverified and must not be treated as warranted operating hours unless the listing expressly confirms it.

How do I turn my pricing into a maximum bid?

Work backwards and divide the percentage charges out. From an illustrative £24,000 resale or utilisation value, take off £1,800 of repairs, £500 of transport and £3,000 of margin, leaving £18,700 for the hammer price plus the percentage buyer charges. Divide by 1.18, being one plus an illustrative 15% buyer's premium and an illustrative 3% internet surcharge, and the maximum hammer bid is about £15,847, producing a premium of about £2,377 and a surcharge of about £475. VAT at 20% then applies according to the lot's treatment. Take the actual rates from the lot's Additional Fees tab, because they change the divisor.

Should I get an independent professional valuation?

For a machine you know well, your own comparable set may be enough for your own bidding decision. An independent professional valuation earns its fee when the figure has to satisfy someone else, such as a lender, an insurer, a board or a set of creditors, or when the kit is specialist enough that comparable sold results are thin. An independent professional valuation can be arranged where one is needed.

Sources and references

  1. Providing and using work equipment safely (PUWER) · HSE, 2026 https://www.hse.gov.uk/work-equipment-machinery/puwer.htm
  2. Lifting equipment at work (LOLER) · HSE, 2026 https://www.hse.gov.uk/work-equipment-machinery/loler.htm
  3. VAT margin schemes (how VAT is charged on second-hand goods) · GOV.UK / HMRC, 2026 https://www.gov.uk/vat-margin-schemes
  4. Universal Auctions Group terms and conditions · Universal Auctions Group Ltd, 2026 https://www.universalauctionsgroup.com/terms-and-conditions

We run timed online, trade-only auctions of plant, machinery, commercial vehicles and business assets, with bidding open from anywhere. We do not inspect the machinery, so carry out your own valuation and inspection before you bid, and we can obtain a no-obligation transport quotation on any lot. Sellers receive 100% of the hammer price together with any applicable VAT, and stock stays on the seller's own site until it is sold and paid for.

View current plant auctions

Universal Auctions Group · EORI registered and export-ready · no seller fees, UK-wide collection. This article is general information for trade buyers and sellers and is not financial, tax or legal advice.

Pavel Uncuta
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