10/07/2026
We are pleased to announce that STP Consultants and Sequal Mechanical have merged, marking a new chapter for our business and the clients we serve across Queensland.
Sequal is a business built on strong values, technical expertise, and a genuine commitment to Far North Queensland, qualities that closely reflect our own. By bringing our two teams together, we are investing further in the FNQ region and significantly strengthening our mechanical engineering capability statewide.
Please join us in welcoming to our Cairns office:
→ Sonia Holzheimer, Mechanical Partner
→ Darryl Duda, Mechanical Partner
→ Karol Winiarski, Senior Mechanical Engineer
→ Kasim Ali, Mechanical Draftsperson
For our clients in Far North Queensland, this merger means a stronger local team, greater mechanical engineering capacity, and the same commitment to quality you have come to expect from STP. Cairns has long been an important region for us, and this is a significant step in our continued investment in the area.
As part of this growth, Sonia Holzheimer, Darryl Duda, Alastair Wilson and Gene Morgan will collectively lead our mechanical teams across the state, bringing a breadth of expertise and long standing industry experience that will deliver great outcomes for our clients.
