"Outstanding execution under tight shutdown windows. AJM United's team turned a high-risk tie-in into a textbook delivery — zero incidents, zero rework."
DR
Daniel R.
Project Manager · Sydney Water Delivery Partner
Engineering · Infrastructure · Maintenance
Available for new projects · 2026
Building Australia'scritical infrastructuresince 1991.
AJM United is a trusted engineering, construction and maintenance partner delivering precision-built outcomes across rail, water, energy and heavy industry.
- 33yrs
- Industry experience
- 500+
- Projects delivered
- 0
- Lost-time incidents
Request a Quote
Start your project
Trusted Partners
Our Partners.
What We Do
A complete spectrum of engineering capability.
From custom asset construction to refurbishment and upgrade, we deliver excellence across every discipline of modern infrastructure.
01 / 06
Engineering
Precision-engineered solutions tailored from concept to completion.
02 / 06
Construction
Full-scope industrial and civil construction across Australia.
03 / 06
Maintenance
Planned and reactive maintenance keeping critical assets alive.
04 / 06
Project Management
End-to-end management — on time, on budget, every time.
05 / 06
Infrastructure Solutions
Long-life infrastructure for Australia's most demanding networks.
06 / 06
Industrial Fabrication
Custom structural fabrication delivered to exacting standards.
Selected Work
Safety and professionalism in every project.
Project management and maintenance services across Australia and abroad, delivered to meet your every need.
Water Infrastructure Completed
Western Sydney
Riverstone Wastewater Treatment Plant
Building Infrastructure Completed
Parramatta, NSW
Western Sydney Stadium
Rail Infrastructure Completed
Sydney CBD
Central Station Rail Works
Water Infrastructure Completed
St Marys, NSW
St Marys Water Recycling Plant
Water Infrastructure Completed
Quakers Hill, NSW
Quakers Hill Sewerage Treatment Plant
Mining Infrastructure Upgrade
Regional Australia
Million Dollar Ounce Project Upgrade
Years of Excellence
0+
Engineering Australia's infrastructure since 1991
Our Story
Delivering Results, Reliability & Rock Solid Dependability.
We understand the Engineering and Construction industry — and we understand business. That's why we don't complicate things. Our motto is simple: find out what you need, and make it happen.
From the construction and installation of a completely customised asset, to a complete refurbishment or upgrade, we deliver excellence, every time.
1991
Founded in Sydney
2005
Major water infrastructure expansion
2015
Stadium & rail milestone projects
Today
Australia-wide engineering leader
0+
Years
0+
Projects
0%
Zero Harm
Why Work With Us
Built on principles. Proven by results.
Six values guide every decision, every project, and every relationship at AJM United.
Integrity
We will always be transparent and fair in our relationships with our clients, our business partners and each other.
Value 01 of 06Transparent. Fair.
Industries We Serve
Specialist engineering across seven sectors.
Unparalleled engineering and construction solutions, with custom fabrication and installation expertise across Australia's most demanding industries.
AJM
The AJM Promise
Excellence in every experience.
01 —
When you work with AJM United, you work with a quality partner that's committed to your success.
02 —
We bring extensive experience and expertise to ensure that your project is designed and delivered to the highest standards.
03 —
We challenge ourselves to continuous improvement in not only our products and services, but in our systems and processes, too.
That's the AJM promise.
Google Reviews
Trusted by clients who don't compromise.
5.0
Rated by industry partners
"Their structural steel package on the stadium roof was the cleanest I've seen in 15 years. Drawings, fabrication, install — every interface tracked."
MK
Megan K.
Construction Lead · Tier-1 Contractor
"Reliable when the schedule is unforgiving. Possession works delivered on time, every weekend. They've earned every project we've handed them."
AP
Anthony P.
Asset Owner · Rail Sector
"From engineering through commissioning, the quality of workmanship and documentation has been exceptional. Truly a partner, not just a contractor."
SL
Sarah L.
Operations Manager · Water Utility
"Specialist welding capability that very few firms in Australia can match. Exotic materials, ASME compliance, on programme. Highly recommended."
JT
James T.
Principal Engineer · Energy
"Their Zero Harm culture is the real deal — visible on site, in the paperwork, and in the way crews speak. Safety leadership from the top down."
LN
Linh N.
HSE Director
"Outstanding execution under tight shutdown windows. AJM United's team turned a high-risk tie-in into a textbook delivery — zero incidents, zero rework."
DR
Daniel R.
Project Manager · Sydney Water Delivery Partner
"Their structural steel package on the stadium roof was the cleanest I've seen in 15 years. Drawings, fabrication, install — every interface tracked."
MK
Megan K.
Construction Lead · Tier-1 Contractor
"Reliable when the schedule is unforgiving. Possession works delivered on time, every weekend. They've earned every project we've handed them."
AP
Anthony P.
Asset Owner · Rail Sector
"From engineering through commissioning, the quality of workmanship and documentation has been exceptional. Truly a partner, not just a contractor."
SL
Sarah L.
Operations Manager · Water Utility
"Specialist welding capability that very few firms in Australia can match. Exotic materials, ASME compliance, on programme. Highly recommended."
JT
James T.
Principal Engineer · Energy
"Their Zero Harm culture is the real deal — visible on site, in the paperwork, and in the way crews speak. Safety leadership from the top down."
LN
Linh N.
HSE Director
Ready When You Are
Building The Future On A Foundation of Excellence.
Partner with AJM United and experience the difference of working with Australia's most trusted engineering and infrastructure team.