GPR scanning costs in the UK — what to expect

GPR scanning costs in the UK vary, but not as wildly as some buyers expect. The market is competitive, the equipment is broadly similar across reputable suppliers, and the day rate of a qualified surveyor is in a reasonable range. Where prices vary widely, the variation is usually telling you something — about scope, about specification, or about the company quoting. Here is an honest guide.

How GPR work is priced

Most UK GPR scanning is priced by:

• Day rate or half-day rate for a surveyor and equipment on site.
• Travel and mobilisation charges where the site is significantly distant from the surveyor’s base.
• Reporting time, sometimes itemised separately, often included in the day rate.
• Specialised equipment uplift where multi-channel arrays, drone platforms, or other specialist kit is needed.
• Out-of-hours premium for night, weekend, or possession-window work.

For a typical concrete scanning job on a single element — pre-drill scanning of an area, for example — the cost is usually quoted as a single sum that bundles all of these.

Typical ranges

A short tour of typical price ranges (indicative; specific quotes will vary):

Pre-drill scanning of a small area. Half-day surveyor attendance plus reporting. Typically a few hundred pounds for a half-day job, more for full-day work, with travel surcharges for sites outside reasonable range of the surveyor’s base.

Reinforcement mapping of a typical slab. Often a one-day job for a single surveyor on a single element. Reporting is included. Output is the on-slab markup, the report, and the CAD plan.

Post-tension floor scanning. Premium pricing for the additional skill and care required. Usually quoted on a per-area basis, with explicit reference to PT scope.

Multi-element survey. A campaign across several elements is priced by total survey time, with efficiency savings for combined attendance.

Large-scale GPR. Vehicle-towed or array systems for site-scale or pavement work. Priced by area, often substantially less per square metre than concrete scanning despite the larger equipment.

Combined GPR-and-ferro scanning. Adds modest cost over GPR alone because the equipment and surveyor are already on site.

The honest guidance: for a small concrete scanning job, the bill is usually a few hundred pounds rather than a few thousand. For a multi-element campaign, the bill scales with site time. For specialist work — large-scale GPR, drone-mounted LiDAR, multi-method campaigns — the bill is more material.

What affects the price

Scope. The most obvious driver. A larger area, more elements, or denser scanning all increase price.

Equipment specialisation. Routine concrete scanning is the cheapest end. Multi-channel arrays, drone-mounted LiDAR, and specialist kit cost more.

Site location. A surveyor’s base is in a particular region. Sites within reasonable travel are quoted at standard rates; sites further away carry travel and accommodation surcharges.

Access constraints. Out-of-hours work, possession windows, height work, confined spaces, secure environments, and similar constraints all increase cost.

Deliverable complexity. A standard report is included in most quotes. BIM modelling, advanced data integration, or multi-format CAD output may carry additional charges.

Sector premiums. Some sectors (rail, nuclear, defence) carry inherent overheads — vetting, induction, escort, additional QA — that show up in the quote.

Reporting deadlines. Standard turnaround is usually included; same-day or next-morning reporting is often available; faster than that may carry a premium.

What to specify to control budget

A few things you can do to keep the cost down without compromising quality:

Combine adjacent work into a single visit. Mobilisation is a fixed cost; if multiple elements can be scanned on one attendance, you save the second mobilisation.

Plan access in advance. Lost time on site (waiting for inductions, access, or surface preparation) drives up cost. Site-ready preparation reduces it.

Specify scope precisely. Vague briefs are quoted conservatively, which means more expensive. Specific briefs are quoted tightly.

Bundle deliverables intelligently. Asking for an exotic deliverable that you don’t actually need adds cost. Asking for the standard deliverable in the standard formats keeps cost in line.

Be flexible on timing where possible. Off-peak attendance can sometimes secure better rates.

What to avoid for budget reasons

A few things that look like savings but aren’t:

Skipping the survey because the budget is tight. The cost of one strike or one structural rework dwarfs the cost of any survey. The arithmetic against scanning is bad.

Hiring a less-credentialled surveyor for cost reasons. The deliverable is harder to defend, the work is less reliable, and the apparent saving rarely survives a single project’s worth of marginal cases.

Reducing sample density to cut cost. A test programme without statistical confidence is not a defensible deliverable. Reducing density saves a small amount up front and produces a much less useful deliverable.

Cutting reporting scope. A full report — with method, calibration, findings, limitations, and sign-off — is the deliverable. Cutting it down to “we marked up the slab” produces something that is not defensible.

When a low quote is a warning

A quote that is dramatically lower than the rest is usually telling you one of three things:

• The surveyor is less qualified than the alternatives.
• The scope has been compressed in ways that will compromise the work.
• The deliverable will be reduced.

Asking the surveyor to explain the basis of their price is reasonable. A confident company can articulate it. A less confident company often cannot.

Practical advice

For most UK construction projects, GPR scanning is one of the lower-cost line items in the survey budget. It is also one of the highest-leverage. The honest guidance is to specify scope precisely, choose a credentialled surveyor, and pay a fair price for defensible work. The marginal cost over a cut-price alternative is small relative to the value the work delivers — and the difference in quality is significant.