Public weighbridges: costs, rules, and how to use one

A public weighbridge is a bridge anyone can drive onto and pay to use. Most charge somewhere between £10 and £15 plus VAT per weighing — a few as little as £5, some £20 or more — and a load weight needs two weighings, one loaded and one empty, so a true net weight on a trailer typically costs £20–£30 plus VAT. For a farm without its own bridge, that's the price of knowing rather than guessing.

Here's when a public bridge earns that money, how to find one, and how to make sure the ticket you drive away with is worth something later.

When a farm uses a public weighbridge

Three situations account for most farm visits.

Selling grain without your own bridge. If the only weight on your loads is the buyer's intake figure, you're taking their number on trust. Weighing a few loads over a public bridge on the way in gives you an independent check. You don't need to weigh everything — a handful of loads early in a contract tells you whether the merchant's intake and your expectations agree, and most of the time they will.

Checking for overloading before the road. A grain trailer takes 14–18 tonnes and it's easy to draw more out of the heap than you meant to, especially with a dense sample. If a combination gets stopped and weighed over its limit, the consequences land on you, not the grain. A public weighing is cheap insurance when a load looks heavy — see tractor and trailer weight limits for the numbers, and check current gov.uk guidance because the rules have their own detail.

Settling a dispute. When the merchant's self-billed invoice says 27.4 tonnes and you'd swear the trailer carried 29, an independent weight from an approved public bridge is what turns an argument into a conversation. It only works if you weigh before the load is delivered — a weight taken after the grain's been tipped proves nothing.

How to find one

Start with the government's register at find a weighbridge, which lists public weighbridges by area. The underlying registers are kept by local council Trading Standards departments, so if the online list looks thin near you, the council is worth a phone call.

In practice, public bridges hide in plain sight: grain merchants, quarries, waste transfer stations, scrap yards and hauliers often run one alongside their own business. Some are only public during office hours, which matters when you're carting at nine in the evening.

A public weighbridge must be approved and verified for trade use, and the operator must hold a certificate of competence. That's what makes the ticket independent evidence rather than just a number somebody wrote down. If you want the background on how the bridge itself works, start with what is a weighbridge.

What it costs

Item	Typical cost
Single weighing	£10–£15 + VAT (full range roughly £5–£20)
Net load weight (two weighings)	£20–£30 + VAT
Account or regular-user rates	Often negotiable — ask

Small money per load; real money at harvest pace. Moving a 500-tonne wheat shed in eighteen artic loads at £25 a load is £450 in weighing fees, plus the diesel and time of every detour. That arithmetic is why public bridges are a checking tool for most farms, not a recording system — if you find yourself wanting a weight on every load, the sums point at other options or a bridge of your own.

Ring ahead

Ten minutes on the phone saves a wasted trip:

• Opening hours. Many public bridges keep office hours. Harvest does not.
• Payment. Some take cards, some are cash only, some want an account set up. Find out before you're sat on the bridge.
• Vehicle fit. A standard 50-tonne bridge takes an artic, but a tractor and long trailer can overhang a shorter deck. Some operators will do a split weighing in two passes; others won't, because it's less accurate. Ask about your actual combination.
• Two visits or one. If you're weighing loaded then coming back empty for the tare, check they'll still be open when you return.

On the day

The visit itself is simple. Drive on slowly and stop where the operator tells you. The operator reads the weight, records the vehicle registration, date and time, and prints a ticket. Drive off, pay, keep the ticket.

To get a net weight that stands up:

• Weigh loaded and empty on the same day, same bridge, with the same fuel and kit on board. A tare from last week can be a couple of hundred kilos adrift once mud, rain and a full tank get involved.
• Tell the operator what the load is so it goes on the ticket. "Wheat, from Home Farm" is more useful in February than a bare weight.
• Note which field the load came from and where it's going yourself — the operator won't, and that detail is what makes the weight useful for anything beyond the sale. What belongs on a complete record is covered in weighbridge tickets.

Keep the ticket

The ticket is the product. It's evidence in a weight dispute, part of your traceability for assurance, and a record supporting the sale for VAT purposes — six years is the safe retention period for anything touching a transaction. Thermal paper fades, so photograph tickets the day you get them and file the images somewhere that isn't a jacket pocket.

Frequently Asked Questions

How much does it cost to use a public weighbridge?

Typically £10–£15 plus VAT per weighing, with the full range running from about £5 to £20 depending on the site. A net load weight needs two weighings — loaded and empty — so budget £20–£30 plus VAT per load.

How do I find a public weighbridge near me?

Use the gov.uk "find a weighbridge" service, which lists registered public weighbridges by area. Local council Trading Standards departments keep the registers, and merchants, quarries and hauliers' yards often operate public bridges that aren't well advertised.

Can I weigh a tractor and trailer on a public weighbridge?

Usually, but ring first. A long tractor-and-trailer combination can overhang a shorter deck, and while some operators will weigh it in two passes, split weighing is less accurate and not every site offers it.

Is a public weighbridge ticket legally reliable?

A public weighbridge must be approved and verified for trade use and its operator certificated, so its tickets carry real weight as independent evidence in a dispute. Keep the ticket, and photograph it before the thermal paper fades.