Private Investigators Perth

spencer@tpg.com.au
Open Hours: 24 Hours Professional Service

Contact Info

251 Stirling Street, Perth, WA 6000
08 9378 2335
spencer@tpg.com.au

Discover The Truth

Licensed & Confidential Investigations Over 30 Years Solving Cases Across Australia & Internationally

Get Free Consultation

Discover The Truth

Catching Cheating Partners

Discreet Surveillance | Photo & Video Evidence Perth’s Most Trusted Infidelity Investigators

Speak Confidentially

Discover The Truth

Background Checks & Fraud Investigations

Romance Scams | Business Partners | Missing Persons We Find What Others Can’t – Guaranteed Discretion

Start Your Case Today

Court-Admissible Evidence

Photo, video & time-stamped reports that hold up in court – every case, every time.

Licensed Perth Investigator

Licence 1A22115 | Confidential | Available 24/7 Call Pete direct: 0417 901 354

About Us

Experienced Private Investigator at Your Service

Alpha Investigation Services is owned and operated by Pete Spencer, a fully licensed Western Australian private investigator (Licence 1A22115) with over 30 years of real-world experience. Based in Perth, we help individuals, families, and businesses uncover the truth with complete discretion and court-ready evidence. From infidelity and surveillance to background checks, missing persons, and fraud investigations, we deliver fast, professional results you can trust – 24 hours a day, 7 days a week.

Licensed & Insured Private Investigator

Free Confidential Consultation

30+ Years Experience

100% Discreet & Confidential

Available 24/7 Across Perth & WA

Our Services

Private Investigation
Services

Domestic

Infidelity & Cheating Partners

Suspect your partner is being unfaithful? We provide discreet surveillance, photo/video evidence,…

Commercial

Background Checks & Fraud

Protect yourself from romance scams, dodgy business partners, or hidden assets. Full…

Surveillance

Surveillance & Missing Persons

Professional surveillance anywhere in Perth or WA. We also specialise in locating…

Why Choose

Several Reasons Why You Choose a Private Investigator.

With over 30 years of experience and a fully licensed Western Australian agency (Licence 1A22115), Alpha Investigation Services delivers fast, discreet, and court-ready results. Based in Perth, Pete Spencer and his team handle everything from infidelity and surveillance to background checks, missing persons, and fraud cases – 24 hours a day, 7 days a week.

Expert Investigator Agents

100% Confidential

Available 24/7

Watch Our Private
Investigation

Years Serving Perth & WA

Client Confidentiality

0k+

Successful Cases Completed

Testimonials

After 6 years I finally needed to locate my ex-wife to serve divorce papers. Pete found her…

David L.

Perth

Needed an urgent background check on a business partner from overseas. Alpha Investigation turned it around in…

Michael R.

Western Australia

Pete was recommended to me when I suspected my partner was cheating. Within a week I had…

– Sarah K.

Perth

Investigator

Our Dedicated Investigators

Frequently Asked Questions

How much does a private investigator cost in Perth?

Every case is different, but most start from $950–$1,500 + GST for the first few days of surveillance or background checks. You’ll get a clear quote after your free phone consultation – no surprises.
Will anyone know I hired you?

Never. 100% confidentiality is guaranteed. Your identity and the entire investigation stay completely private – we never disclose client details to anyone.
How quickly can you start my case?

Same day or next day in most situations. Pete is available 24/7 on 0417 901 354 – call or message anytime and we can begin immediately if required.
Is the evidence you collect usable in court?

Yes. All photos, videos, and reports are time-stamped and gathered legally so they are fully admissible in the Family Court or any legal proceedings.
Do you work outside of Perth?

Yes – we cover all of Western Australia and regularly handle interstate and international background checks and missing persons cases.