From humble beginnings
John and Margaret O’Connor founded Diona in 1980. Since then the company has grown to become one of the most respected civil engineering companies in Australia with over 500 employees.

Our specialty is technically complex urban projects. We have a proven track record of developing equipment and innovative solutions to meet challenging client requirements.

We've got you covered
Diona is set apart by our comprehensive ‘one-stop’ service offering and single point of accountability for all of your utility and infrastructure needs.

We offer a true turn-key solution covering all aspects of design and construction encompassing trenching, drilling and pipeline installation for water, drainage, sewer, gas, electricity and transport infrastructure.

We are accredited service providers to Energy Australia, Energex, TransGrid, Sydney Water, Queensland Urban Utilities, Brisbane Water, APA, Jemena, and Telstra, as well as many other asset owners. We’ve also worked on many projects for local councils in the greater Brisbane, Sydney and Adelaide regions.
A hands-on approach
In the complex (and potentially expensive) world of infrastructure delivery – the price of an on-time, hassle-free project delivery is hard to put a figure on. For us (and our clients), it equates to value.

At Diona, we pride ourselves on our ability to self-perform. With a range of skilled personnel and specialised plant, we have the flexibility and depth to deliver complex infrastructure projects and react quickly to changes in scope.

We approach every project collaboratively engaging with our clients, stakeholders and the community from start to finish. We feel that an open dialogue and complete transparency does, in fact, translate to fewer headaches, less room for error and much smoother project scheduling. In turn, this means lower costs and fewer delays.

Moreover, we believe our approach translates to a safer project and every single Diona employee, from Excavator Operator to Executive General Manager, live and breathe a safety-first culture. Our workforce is well-trained in workplace health, safety and environment management.
Constantly evolving through innovation
We know our clients are under pressure to complete projects on time and within budget. That is why we are constantly evolving our design techniques, delivery methods and technology offering to complete projects quicker, more cost effectively and with less environmental and community impact.

Experience you can rely on
There is no substitute for experience, and Diona has it. After more than 38 years in operation, our depth of knowledge and experience is extensive. Furthermore, many of our people on site and in the management team have been with us for ten years or more and are highly skilled in their field of expertise.