GSTECH | Our History

THE HISTORY OF GSTEC

GSTEC has been operating in the Sydney market since 1981, working in the areas of electrical for mechanical installation, electronic controls, switchboard construction, and DDC/BMS design, engineering, supply and installation.

Family Business

Family Values

GSTEC Pty Ltd has been operating in the Sydney market since 1981, working in the areas of electro-mechanical installation, electronic controls, switchboard construction, DDC/BMS design, engineering, supply and installation.


Over this time, key partnerships were formed with building automation suppliers, including Honeywell (1999) and Schneider (2007).


GSTEC has been proudly owned by the McMillan Family for 40 years.


Starting in the early 1980's as Citywide Electrical, becoming Greenstar Building Automation in 2010 and then, in 2019, with an eye to the future, GSTEC became a registered trademark.


In 2021, the company proudly celebrated its 40 year milestone.


GSTEC continues to grow in capacity, staff, expertise and innovation whilst fiercely protecting its family business ethos and values.

GSTEC’s work is based predominantly in the eastern states, however, our team regularly undertake projects across Australia.

There are now 80+ employees and whilst our team, capabilities and market presence continue to grow, we remain a privately-owned Australian company, take great pride in our team and our work, and maintain a fiercely held customer-first attitude to all that we do.

Head Office

1 / 10-14 Lilian Fowler Place

Marrickville NSW 2204

Ph: 1300 938 216

reception@gstec.com.au