group one investigations Private Detective

We provide bespoke solutions to both corporate and private clients in Australia and abroad.

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Private Investigation Services

Group One Investigations operates 24-hours-a-day, 7-days-a- week, specialising in surveillance, intelligence gathering, private investigation, locating missing persons, and security services. We are licensed by the Australian Government and all of our operations, no matter how large or small, from information gathering to clandestine surveillance, are conducted using only legal means, and are handled firmly under strict confidentiality agreements. Group One Investigations offers free consultations. Please read ahead to find out more about our services or contact us on 1800 181 880 or email your enquiry to

Knowing the truth about any given situation grants considerable power, and simply proving or disproving a suspicion will often be enough to achieve or maintain success. Our investigators range from experienced detectives and experts in military and police intelligence, to lawyers proficient in the minutiae of the private and corporate sector.


Surveillance is a crucial activity in the repertoire of private investigation skills and services. We provide covert surveillance of an individual or organisation to acquire evidence, build a case, and to ascertain the truth of a situation. You might require surveillance for any number of reasons, ranging from spousal infidelity, child custody conflicts, to revealing a plot or scheme against you, your family or your business. Group One Investigations’ surveillance services aren’t limited to Melbourne, but also extend domestically, to the rest of Australia, and internationally, there is no country where we cannot interact with the necessary assets to ensure that our investigation continues wherever your subject may travel.


We specialise in a diverse range of investigations services:

Corporate Investigations - Insurance investigations (workers’ compensation, general liability, site inspections), identifying competitors or employee subterfuge, and more.
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Private Investigations - Matrimonial investigations (partner infidelity, childcustody), belligerent or antagonistic neighbours planning sabotage, suspicious individuals or potential stalkers, and more.
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Locating Missing Persons

Our location services are ideal if you’re looking for a missing loved one, a friend you’ve lost contact with over the years, or a misplaced debtor who owes you or your organisation money. The sooner we are contacted about these types of cases in particular, the sooner we can begin seeking them out.

Background checks

If you want to make the most informed decision about whether to commence a business relationship with a person, employ an individual, or engage in an ongoing romantic commitment, a background check is an excellent start in attaining the most comprehensive information possible that the individual might not otherwise divulge voluntarily. They might have a criminal record, or a history of disreputable business arrangements that they’ve obscured through a range of fabricated identities and personal rebranding, however there is always a paper trail or series of breadcrumbs that we are experienced inidentifying, either in the real world or online. We are capable of performing an exhaustive search of hundreds of databases, sifting through their online presence including dating websites and social media, and any other niche presence they may have on the web.

Bug Sweeping

Often your competitors or other prying individuals may try to gain the upper hand against you. If you suspect a competitor or some other malevolent individual has planted bugs or other hidden devices in your home, office, or vehicle, Group One Investigations is your first port of call in Melbourne to uncover these devices, pinpoint the weaknesses in your office or home security that enabled the initial intrusion to occur, identify the organisation or persons behind the furtive observation and, most importantly, give you peace of mind. Don’t let yourself become a paranoid mess searching for these devices on your own. More often than not these types of devices are undetectable to the human eye and will typically be hidden in everyday objects and electrical equipment. Along with our expertise in bug sweeping, we have specialised equipment that can detect concealed devices of this nature. Once we’ve discovered these devices we can identify the best course of action along with options to ensure that your needs are satisfied.

List of Services


For a more thorough list of services we provide specialist investigations which include, but are not limited to:

  • Surveillance (both small and large scale) of individuals, groups, and organisations
  • Activity reports
  • Undercover operations
  • Asset protection services
  • Email tracing & Internet based investigations
  • Process Serving (Specialise in Difficult Process Services)
  • Employee theft investigations & countermeasures
  • Hidden asset location
  • Counterfeit cases
  • Copyright Infringements and intellectual property investigations
  • Family law
  • Child custody matters
  • Litigation support services
  • Witness locations
  • Due diligence
  • Sale and hire of surveillance, detection and recording equipment
  • Mobile Phone Examination - Examinations undertaken on portable devices, including Android, and iOSX phones, GPS, and even Media SD/Cards

The equipment within the laboratory alone is in excess of USD $30,000



What is a private detective?

A private investigator (also known as a private detective, or inquiry agent) is a person who can be hired by individuals or groups to undertake investigatory services. Group One Investigations is a private investigation company which undertakes a variety of work for a range of clients including attorneys in civil and criminal cases, corporations, Government and domestic clients.

Why hire a private detective?

There are many reasons why an individual or corporation would hire the services of a private detective or private investigator, ranging from counterfeit investigations, pre-employment background screening, matrimonial investigations, corruption, child custody matters, divorce support / asset searches, counter intelligence services, forensic accounting, IT / cybercrime and data recovery services. These are among just a few of the many services we provide our clients. Contact us for more information <link to contact us>, or click here to read some of our case studies.

When to hire a private detective

Depending on the issue at hand clients hire us at various stages of legal, corporate, Governmental and personal matters. Our most common task is intelligence gathering. This can occur either before or after an issue has been highlighted by our client which needs further investigation / answers. Intelligence gathering can also be used to avoid a problem occuring i.e. pre- employment screening, litigation support services etc.


Group One Investigations is dedicated to the satisfaction of our clients and utterly resolute in solving the cases we’ve been entrusted with. Our Director favours a hands-on approach and works directly with each and every one of our private investigators to ensure all of our operations are a success and reflect the professionalism promised to our clients. We want the most satisfactory outcome for you. As such, don’t forget that we provide free consultations 24-hours-a-day, 7-days-a-week, so please call us on 1800 181 880 or email your enquiry to and we can start the process of uncovering the truth right away!