Can I Hire a Private Investigator to Follow Someone in the UK?

Updated 5 October 2026 by Investigation Bureau

Yes. In the UK it is lawful to hire a private investigator to follow someone, provided there is a legitimate purpose and the work is done in public, proportionately and without harassment. Most of the matrimonial, insurance and workplace evidence that reaches a court is gathered this way. It becomes unlawful, and any reputable investigator will refuse it, when the aim is to intimidate, to pursue a person who has cut off contact, or to get round a court order. This guide explains where the lines are, what a surveillance operation involves, what it costs per day, and how to tell an investigator who will keep you within the law from one who will not.

Most clients are surprised to learn that the UK still has no statutory licence for private investigators. Following someone is therefore governed by the general law: harassment, data protection, trespass, privacy and the rules of evidence. A professional investigator knows those rules as a driver knows the road. The practical result is that lawful surveillance is routine, and unlawful surveillance is a liability for the client as much as for the investigator.

What the law allows

Watching someone in public is lawful. A person walking along a street, sitting in a café, driving on a road or going into a building from the pavement cannot reasonably expect that nobody will see them. Covert surveillance records what any passer-by could have seen. It simply does so systematically, with timestamps.

Data protection applies. To follow and record someone is to process their personal data. A professional investigator does that under a documented lawful basis, usually a legitimate interest, balanced against the rights of the person being observed. We are registered with the ICO as a data controller (ZC259849) for that reason. Our guide to whether it is legal to hire a private investigator sets the framework out in more detail.

Harassment is where it stops. The Protection from Harassment Act 1997 makes it a crime to pursue a course of conduct that causes alarm or distress. Covert, proportionate surveillance for a legitimate aim, which the subject never notices, is not harassment. Repeated open following, confrontation, or surveillance really meant to frighten someone plainly is, and the client who ordered it shares the exposure.

Private property is off limits. Investigators do not go into homes, gardens or private premises without permission. They do not put cameras inside private spaces, and they do not intercept calls or messages. Anyone who offers to do those things is offering to commit an offence and to give you evidence a court will reject.

RIPA does not apply to you. Clients often ask whether they need an authorisation under the Regulation of Investigatory Powers Act. That regime is for public bodies. Private surveillance is governed by the law described above, not by RIPA, although the principle of proportionality at its heart is a sound habit for anyone.

Who has someone followed, and why

Partners who suspect infidelity and want certainty before a decision that will change their lives. Lawfully gathered evidence is accepted in family proceedings, and just as often the surveillance clears the person who was suspected.
Employers facing sickness-absence abuse, an employee working a second job while signed off, theft, or someone breaching a restrictive covenant on the way to a competitor. Where a reasonable employer would have had grounds, tribunals accept covert surveillance that is proportionate.
Insurers and defendant solicitors testing whether a claimed injury fits what the claimant is seen to do. No use of surveillance evidence is better established in the English courts.
Landlords who suspect a tenant of subletting or of not living at the property.
Solicitors who need a witness found, a subject's pattern of life established, or papers served on a person who is avoiding service.

What a surveillance operation looks like

An instruction starts with a free conversation: what you need to know, what evidence would settle it, and whether surveillance is the proportionate way to get it. If it is, we give you a fixed price in writing. Before anyone deploys, the investigators study the ground: addresses, routes, transport and the places the subject is likely to go. Our in-house OSINT tooling maps the CCTV, road layout and public infrastructure around a location, so the operatives arrive already knowing the area.

On the day, between one and three trained operatives work on foot and in vehicles. They hand the subject from one to another so that no single face or car is seen twice. Everything relevant goes onto timestamped video and into a log written at the time. Where the movements of a vehicle matter more than those of a person, a lawfully deployed tracker, monitored on our own operations platform, can take the place of a second vehicle. That is subject to the assessment described in our guide to GPS tracker law.

You receive a written report together with the footage. It sets out what happened, when, where and how it was observed, in a form a solicitor can use and a court can follow. Our illustrative surveillance case story follows an operation from the first enquiry to the final report.

What it costs

Surveillance is priced per operative per day. Across the UK market that typically means £500 to £1,200 per operative-day, depending on the size of the team, the vehicles and the hours. We quote a fixed price in writing before any work begins. A typical matrimonial instruction comes to two or three days, picked for the moments that matter, not a fortnight spent watching a front door. A workplace or insurance instruction is usually similar. Our full guide to private investigator costs explains how day rates add up and what the warning signs are in a cheap quote.

The instructions we refuse

We will not follow an ex-partner who has ended contact. We will not follow anyone protected by a restraining order, a non-molestation order or an occupation order. We will not act where the client's explanation of why does not hold together. Instructions that involve children get close scrutiny, and we accept only proportionate welfare concerns raised by someone with parental responsibility. We decline surveillance meant to confront, expose or intimidate, as opposed to establishing a fact. None of this is caution for its own sake. These refusals are what keep the surveillance we do lawful. They are the difference between evidence and a harassment complaint with your name on it.

Frequently asked questions

Is having someone followed legal in the UK?

Yes, where there is a legitimate purpose and it is done in public, proportionately and without harassment. Surveillance of an ex-partner who has cut contact, of anyone protected by a court order, or with the aim of intimidating someone is unlawful, and a reputable investigator will turn it down.

Can I have a private investigator follow my husband or wife?

Yes. Matrimonial surveillance is lawful and is one of the most common instructions UK investigators receive. The evidence is accepted in family proceedings. The result is honest whichever way it falls: it confirms the suspicion or, just as often, clears the person suspected.

Is my employer allowed to have me followed?

An employer may commission proportionate covert surveillance where it has reasonable grounds, such as credible evidence that an employee signed off sick is working somewhere else. Tribunals expect the surveillance to be necessary, targeted and documented. Evidence gathered on that basis is regularly accepted.

What does it cost to have someone followed for a day?

Typical UK market rates are £500 to £1,200 per operative per day, depending on team size, vehicles and hours. We fix the price in writing before work starts. Most instructions need two or three carefully chosen days, not continuous coverage.

Will the person realise they are being followed?

Professional surveillance is designed to go unnoticed: trained operatives, changes of vehicle and face, and a rule to stop and withdraw at any sign of compromise. Being spotted ends the operation and risks a harassment complaint, which is why an experienced team pulls back instead of pressing on.

Can a private investigator follow someone overseas?

It can be arranged. Cross-border work is handled with trusted partners, and the quote is fixed in writing before any work begins.

Find out what is really happening. Speak to an investigator in confidence. The first conversation is free, carries no obligation, and includes an honest view on whether surveillance is the right tool: send a confidential enquiry.