How Much Is a Lie Detector Test in the UK?

Cost is one of the first questions people ask before booking a lie detector test. Prices vary depending on the provider and the type of test used. This guide breaks down what you can expect to pay and why.

We use EyeDetect technology rather than the traditional polygraph. It’s faster, easier to sit through, and more accurate; we’ll explain exactly how it works below.

Whether you’re arranging a test for a personal, relationship, or workplace matter, knowing the cost upfront helps. It lets you make an informed decision before you book.

How Much Does a Lie Detector Test Cost in the UK?

Any reputable and credible lie detector agency will charge between £395 and £550 for a professional test. This price reflects a fully trained examiner, proper equipment, and a legitimate testing process from starting to finishing.

You may come across providers charging significantly less. We’d advise being cautious here. Cut-price testing often means shortcuts somewhere. It may involve the equipment used, the examiner’s training, or the final report quality.

Paying less might feel like a saving, but it’s a risk. You might get results that don’t hold up, or you might get a report that lacks enough detail to actually help your situation. When it matters this much, it’s worth spending on a provider you can trust.

Why Prices Vary Between Providers

Not all lie detector tests are the same. Some providers use outdated equipment or less rigorous methods, which allows them to charge less. Others cut corners on examiner training or skip proper accreditation altogether.

A genuine, professional test takes time, expertise, and the right technology. You see it in the price you pay. That helps explain why industry prices can vary so much between providers.

Our examiner is registered with the World Association Of Professional Investigators, The Council Of International Investigators, and the UK Professional Investigators Network.

What Affects the Price of a Lie Detector Test

Several factors can influence the final cost of your test, and it helps to know what you’re actually paying for.

Type of Test

We carry out EyeDetect testing, which is different from the traditional polygraph. EyeDetect tracks involuntary eye movements and measures pupil dilation, scanning the eyes 60 times per second to spot patterns linked to deception. It’s completely non-invasive, with no wires or sensors attached to your body.

Compared to the polygraph, EyeDetect is faster and easier to sit through. There’s no need for chest straps or finger sensors, and the test itself takes around 30 minutes from start to finish. Most importantly, it’s more accurate, with results over 91%.

Examiner Experience

A properly trained, experienced examiner costs more to book, but that experience directly affects how reliable your results are. Interpreting the data correctly takes skill, and it’s not an area worth cutting back on.

The Report You Receive

A proper test comes with a full, confidential report explaining the results clearly. Preparing this properly takes time, and that shows in the cost of a professional test.

Lie Detector Test at Home: Pricing and Availability

Availability and pricing can vary quite a bit between providers, and it’s worth knowing why before you commit to booking.

Some companies advertise much cheaper tests, and it can be tempting to choose the lowest price. This is especially true when cost is already a concern. The trouble is, a much cheaper test often means something has been cut back. It could be the examiner’s experience, the equipment used, or the report depth.

It’s a gamble, and not one worth taking when the result matters this much to you. Sticking with a reputable provider charging within the standard £395 to £550 range gives you far more confidence in the outcome. You’re paying for a properly trained examiner, industry-standard equipment, and a result you can actually rely on.

Are Free Lie Detector Tests Reliable?

Free lie detector tests aren’t something we’d recommend relying on. A genuine test requires trained examiners, calibrated equipment, and a proper analysis process, none of which can realistically be delivered for free.

If a test is free, ask what it measures, who measures it, and how the results are interpreted. When the outcome really matters, don’t take chances.

This includes relationships.

It also includes legal issues.
It also includes work disputes.
Don’t accept unreliable results just to save money.

Lie Detector Test Kits vs Professional Testing

Home testing kits are sometimes marketed as a cheaper alternative to a professional test. These kits can’t replicate the accuracy or reliability of EyeDetect technology carried out by a trained examiner.

A DIY kit cannot properly measure involuntary eye movements or interpret the results in a meaningful, defensible way. There’s no examiner overseeing the process, no calibrated equipment, and no proper analysis behind the outcome.

Professional testing gives you a clear report.
It follows a consistent standard.
You can rely on it when it matters.

Why Professional Testing Matters

When the outcome affects a relationship, a legal situation, or a personal decision, accuracy matters more than convenience. Professional testing removes the guesswork and gives you a result you can trust, backed by a full report you receive within an hour of your test.

How to Book Your Lie Detector Test

Booking your test is simple. Get in touch with our team, and we’ll talk through your situation, answer any questions, and confirm the details of your appointment.

We offer EyeDetect testing across the UK, with appointments available in:

We keep every step of the process confidential, from your first enquiry through to receiving your results. If you’re still unsure about the cost or what the process involves, we’re happy to talk it through with you before you commit to anything.

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"The Eyes Reveal... What the Soul Conceals"

How Much Is a Lie Detector Test in the UK?