About
GSTEC has been operating in the Sydney market since 1981, working in the areas of electromechanical installation, electronic controls, switchboard construction, DDC/BMS design, engineering, supply and installation.
Our Mission
GSTEC remains an independent player in the electrical for mechanical and building automation markets, harnessing over 40 years of industry experience to provide our clients with custom solutions to suit their needs.
Whether for Building Management Systems, HVAC control systems, energy monitoring and reduction projects, service and maintenance support, or engineering and auditing services, our focus is on client requirements, rather than the more traditional product-centric approach.
To achieve this, GSTEC has developed alliances with suppliers capable of offering reliable and open technologies which give our clients the benefit of choice in the future.
Our Story of Growth & Legacy
GSTEC has been proudly owned by the McMillan Family for 40 years. Over this time, we’ve built strong partnerships with global leaders in building automation, including Honeywell (1999) and Schneider Electric (2007). Despite industry evolution and branding changes, our ownership and structure have remained consistent.
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.
GSTEC’s work is predominantly based in the eastern states, with offices in Sydney and Brisbane, however our team regularly undertake projects across Australia.
GSTEC® continues to demonstrate an enduring commitment to growth and excellence, through the products and services provided.
Leadership Team
SKILLED. DEDICATED. COLLABORATIVE.
GSTEC is powered by a skilled team of field-based electricians, service and commissioning technicians, apprentices, and project managers, supported by unit managers, engineers, designers, estimators, and administrative staff. Many of our team members have been with GSTEC for over 10 years. This is a great reflection of our culture but also the wealth of technical skills and industry knowledge within the business. Together, we bring the expertise and collaboration needed to deliver exceptional results on every project.SENIOR MANAGEMENT
Doug McMillan
Director
Liam Casey
General Manager
Greg Webb
Sales Manager/Business Development Manager
Sevda Stewart
Financial Officer
TEAM MANAGEMENT
Alex Nott
Business Unit Manager - QLD & NT
James Porter
Business Unit Manager - Service
Tom Webber
Business Unit Manager – Projects
Andrew Bastoli
Technical Development Manager
Joanne Borkowski
Sustainability Manager
Our Values
Stability in both ownership and leadership over many years has resulted in clear agreement on the way in which GSTEC conducts its business.
Our People
We support, listen to, and encourage staff – our most important asset.
Respectful communication as well as career and professional development are encouraged across all business units.
We actively promote cultural and gender diversity across the business. Through proactive hiring, as well as a zero tolerance for racial, cultural, religious or gender-based bias or language, GSTEC fosters a truly inclusive working environment.
We work with and support our staff when and where they need it, for both their personal and professional development.
Our Environment
We are committed to environmental responsibility across all areas of our business.
We actively encourage recycling within our office and warehouse environment. Paper, plastics and non-recyclable materials are sorted daily.
We participate in Industrial recycling programs to ensure our electrical and data waste never ends in landfill.
Our commercial premises are purpose built and automated for maximum energy efficiency 24/7.
Our Ethics
We are courteous and respectful to all clients, suppliers, partners and colleagues.
We complete 100% of each job or project 100% of the time.
Our entire team believes that near enough is never good enough.
We choose to lead by example, whether in our office or in the field.
Driving Energy Efficiency, Empowering a Greener Future – Driving Energy Efficiency, Empowering a Greener Future
At GSTEC, sustainability isn’t an add-on, it’s central to how we operate.
Our commitment goes beyond protecting the environment; it’s about supporting the long-term resilience of our industry, our clients, and the communities we serve.
As leaders in building intelligence and systems integration, we take a proactive, data-driven approach to reducing our environmental footprint.
Awards & Recognition
We are proud of our industry-wide reputation for excellence in design, execution and workmanship. Each project receives our full attention, and we are honoured when our peers and industry recognise our efforts with prestigious awards.
NECA Excellence Award - 2023
The NECA Excellence Awards are the electrical and communications industry’s highest accolade and one of the most prestigious awards programs in Australia. These Awards recognise outstanding achievement across the industry nationally across a range of categories.
Category: Commerical Medium
Schneider EcoXpert Project of the Year (Global) - 2022
The Schneider EcoXpert BMS Master Awards are global honours given to the top-performing Master‑level EcoXpert partners in Building Management Systems (BMS). They recognise companies that demonstrate exceptional technical capability, innovation, sustainability impact, and delivery excellence within Schneider Electric’s global EcoXpert partner ecosystem.
Project: Aurora Place
The project consisted of replacement of the BMS/EMS (Building Management System/Energy Management System) and installation of an ICN (Integrated Communication Network) within a fully occupied Premium Grade Building.
Schneider EcoXpert Project of the Year - 2019
Project: Darling Harbour Live – South East Plot
The project consisted of an Integrated EMS and BMS solution using Schneider EcoStruxure software, integration to Daikin VRF system for billing of tenant AC usage and bespoke room zone control utilized incorporated into the Daikin room AC.
NECA Excellence Award (National) - 2018
The NECA Excellence Awards are the electrical and communications industry’s highest accolade and one of the most prestigious awards programs in Australia. These Awards recognise outstanding achievement across the industry nationally across a range of categories.
Category: NECA Energy Efficiency and Environment award
Project: ALDI Store Energy Efficiency Upgrade Rollout
NECA Excellence Award (NSW) - 2015
The NECA Excellence Awards are the electrical and communications industry’s highest accolade and one of the most prestigious awards programs in Australia. These Awards recognise outstanding achievement across the industry nationally across a range of categories.
Project: Penrith RSL BMS upgrade
Full BMS and EMS Upgrade including upgrade of all hardware and peripherals. The upgrade utilised the latest technology from its Niagara Framework and Periscope dashboards.