A search for a day rate turns something up within seconds, and that is the trouble with it. No independent body publishes a day rate for vacuum excavation in the UK: no trade body, no rate book, no statutory fee schedule. Every figure sitting in a search result was published by someone with a reason to publish it.

Where the figures come from

A number with no source behind it usually comes from one of two places. A lead-generation site such as MyBuilder collects quotes submitted by contractors and turns them into an average or a range, built to bring in an enquiry. A supplier such as Vac UK Ltd or PIER (UK) publishes its own rate on its own site, priced for its own fleet, its own region and its own margin, and presents it as a guide figure.

Neither is doing anything wrong. Neither is independent either. A figure with no company attached to it is not a market rate. It is one business's opening position, repeated by enough other pages that it starts to look like an agreed number.

What this means when you price a job

Where a figure can be traced to a supplier or a lead-generation site, that tells you what that company published and when. Ground condition, asset type, spoil disposal route and access change the price more than any published average can capture, which is why the same search term returns a different number every few months without anyone updating the underlying job.

The clause wording you take into a tender document matters more than any single figure you find online. See the scope-of-works wording for this asset type on Specifying It in a Scope of Works, and check which technique the ground actually calls for on Suction, Air and Water — Which Suits This Ground before you price anything against it.

A price for a day's vacuum excavation rarely arrives with anything attached to say where it came from, and that gap does the same work every time: it lets the number be read as if it applies to your job, when it was published for a different purpose altogether.

The kinds of figure you will find

• Supplier: a rate published by a company that sells vacuum, air or suction excavation work, usually as a starting price on its own site. It tells you what that company wants a reader to think its floor is.
• Lead-generation: a figure from a site that does not carry out the work itself, and collects enquiries to pass on to contractors instead. The number's job is to keep you reading long enough to submit a form.
• Trade body: a figure published by an industry association, often as a survey average or a guide price across its members. It describes a spread of past jobs.
• Rate book: a figure from a published pricing framework or schedule. Where one exists for this work, it is the closest thing to an independent reference point.
• Statutory: a fee set by legislation or a regulator, fixed regardless of which contractor is doing the work.
• None: no traceable source at all, just a number repeated from page to page until it starts to look like agreement.

Why the source matters more than the number

A supplier figure and a rate-book figure can display the same number and mean two different things. One is an opening position in a sales conversation. The other is a point of reference you can hold a quote against. Reading the source before the price tells you how much the figure is actually worth, and whether it belongs in front of a contractor at all.

A day rate for vacuum excavation is not one number. It is several decisions already made by the time the figure reaches you: which machine came out, how many people are on it, what happens to the spoil, and how much of the day was spent waiting. Each of these moves the price on its own. Knowing which one you are actually being charged for is what turns a quote into something you can question.

Machine class and crew

A trailer-mounted unit and a truck-mounted unit differ in tank capacity, suction power and how easily they move around a constrained site, and the price follows that difference. The crew changes it again: a single operator costs less than an operator working with a banksman, but the banksman is the check that stops the operator working blind next to a live asset. Two quotes are not comparable until you know the machine class and the headcount behind each one.

Spoil volume and disposal route

What comes out of the hole has to go somewhere, and moving it is priced separately from digging it. A tipping fee at a permitted facility, the number of loads, and whether the spoil is treated as clean or as waste all sit outside the working day rate unless the contractor has folded them in. Ask directly whether disposal is included in the figure quoted or billed per load once the dig is finished.

Standby and mobilisation

Standby is what is charged when the machine and crew are on site but not digging: waiting on a permit, a banksman, or another trade to clear the area. Mobilisation is the cost of getting the machine there and back. Both are usually separate from the working rate, and a job on a live network with permit conditions attached will carry more standby hours than the same dig on open ground with nothing nearby to protect.

Ground condition and asset type

Clay, made ground and rubble-filled trenches take longer to clear than sand or topsoil, and the ground in front of you also decides which technique is appropriate before price is even discussed. Suction, Air and Water — Which Suits This Ground sets out how ground condition and asset type point toward suction, air-lance or water-lance excavation. The asset itself can set a floor under the price regardless of ground: a gas main working to a plant-protection clause demands a slower, more careful dig than the same ground with no buried service nearby.

Turning this into a negotiation

A single figure that does not separate these variables is a guess wearing the shape of a quote. Ask a contractor to break the day rate down, and compare bids item by item.

• Machine class and how many operators it is quoted with
• Whether disposal is included or billed per load
• How standby and mobilisation are charged, and under what conditions
• What ground condition and asset type the price assumes

The same variables belong in the scope of works itself, fixed before the price is agreed. Specifying It in a Scope of Works sets out clause wording for technique, spoil route and reinstatement class that removes some of this from negotiation entirely.

A vacuum excavation job in London clay behaves nothing like the same nominal job in made ground full of old foundations, and a job over a gas main is priced against different constraints than a job over a water main in the same road. A fixed day rate would have to average across all of that, and an averaged rate is wrong for almost every job it is quoted on.

Ground condition sets the pace

Firm, uniform ground clears quickly. Ground with old hardstanding, tree roots, backfilled trenches or unknown obstructions slows the work and can turn a half-day dig into a full one, because the operator is working carefully around whatever the last visit into that ground left behind. Contaminated ground adds handling and disposal steps on top of that.

The asset dictates the technique

Which technique is permitted, and how close to the asset it can be used, depends on the asset type and its owner's own plant-protection rules. That governs how much of the dig can be done quickly and how much has to be done by hand or by careful lance work near the service itself. A job description that names the asset but not the technique constraint has not actually described the job.

What happens to the spoil is a cost.

Arisings that qualify as waste have to be classified, carried by a registered carrier and taken to an appropriate destination, and that route has its own cost attached before a machine ever mobilises. Arisings that can go back in the hole do not carry that cost. Which of those applies is a site-specific question, and it changes the total before a single hour of digging is priced.

Access and standby are part of the job.

Getting a machine and crew to a live carriageway, a confined yard or a site with restricted working hours costs time that a rate quoted for open ground never included. Standby while a road closure is arranged, or while a permit is confirmed, is time the crew is booked but not digging.

A supplier asked for a number before any of this is known is not quoting the work. They are quoting a guess at how much of the above will go wrong, and pricing that guess into the figure. Working through which technique suits the ground and asset in question and setting the disposal route in the scope before asking for a price is what turns a guess back into a quote for the actual job. See how these variables are written into a scope of works so a supplier is pricing the job you have.