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Our Story

Industry-leading plumbing design and estimating.

Built on Detail

At MJI Design, we specialise in hydraulic engineering with a focus on clarity, efficiency, and real-world application. Established in 2019, we’ve grown into a trusted design, drafting, and modelling firm committed to delivering value-driven hydraulic solutions.

Our journey began with a simple idea – to support plumbers, engineers, builders, and developers with detailed, reliable drawings throughout the design and construct process. By blending practical, on-site experience with professional engineering expertise, our team brings a well-rounded, hands-on approach to every project. This multifaceted perspective allows us to confidently navigate complex environments, offering technical advice, independent inspections, and sophisticated hydraulic designs tailored to each development.

Over the years, we’ve partnered with clients across a wide range of sectors, delivering practical solutions that save time, reduce errors, and bring ideas to life. With a keen eye for detail and a commitment to excellence, we combine technical skill with deep industry insight to support projects of all sizes – from residential developments to major infrastructure works.

At MJI Design, we’re known for producing cost-effective, practical systems that integrate seamlessly into the built environment. We don’t just design hydraulics – we engineer smarter, more sustainable outcomes.

MJI Design in Numbers

2019

Our firm is founded

1000

Projects completed

160

Satisfied clients

Meet Mark

MJI Design was founded in 2019 by Mark Ivosevic, a licensed plumber and hydraulic designer with over 15 years of combined on-site and administrative experience.

Built on a foundation of hands-on construction expertise, Mark now leads a team of skilled designers, drafters, and estimators who service clients across multiple countries. Together, they bring deep industry knowledge and a shared passion for delivering precise, tailored drafting solutions that meet the unique requirements of every project.

We work with

We collaborate with Trade Contractors, Builders, Developers, Architects, and Engineering Consultants on projects of all scales. From tier-one construction sites to residential renovations, our clients trust us to deliver with precision and care.

Whether it’s a large commercial development or a simple home office upgrade, no project is too big or too small.

Our Happy Clients

Jesse MoranoJME Group VIC

We work with Mark and the team at MJI Design for all our electrical As Built Drawings on all our projects. However tight the deadline, they always get it done, on time and on budget. Having them in our corner makes our jobs (and lives) so much easier.

Shaun McGrathMcGrath Plumbing Co

Working with MJI Design is stress-free. We use them for everything from Hydraulic Shop Drawings to As Built and fire block plans. Mark handles builder communication directly, which takes pressure off us and lets us focus on the job. We’ll definitely keep working with them.

David WhiteheadCleveland Bay Plumbing QLD

We’re based in QLD, and MJI is in VIC, but that’s never been an issue. They’re fast, reliable, and professional - often turning around As Builts the same day. They’ve been our go-to ever since, and we wouldn’t work with anyone else.

Michael McLeodMetroelec VIC

I couldn’t recommend MJI Design enough for Electrical As Built drawings. Working with them is a simple experience, and a pleasure. We email Mark the CAD files and markups and they send it back, professionally presented and on time.

Ready to talk shop?