Our Story

Our passion towards our customers reflects the ethos of our family-owned and operated business; we support each other and our clients with honesty and respect. This is our point of difference. We don’t just aim to be one of the leaders in cavity doors, we aim to be one of the best in service, too. That’s why our customers continue to work with us and speak so highly of our products and staff.

The idea for Triline Quality Door Systems was born in 1996 when founder and home builder, Stuart Colledge, noticed that there was no easy way to obtain pocket sliding doors in Tasmania. After a few years of extensive product research, design and development, Triline launched its first cavity sliders in a leading hardware store in Hobart. Over the next eight years our output increased steadily and by 2004 we outgrew our facilities. 2005 saw us expand to a larger premises and, as a result, we have significantly increased our production output.

With more space and the passion to go further, we overhauled and re-designed our cavity pocket system. After much refinement and consultation with our customers, the Phoenix™ cavity slider was formed. We continue to grow and improve our product range to give our customers more options and avenues for creative exploration in internal sliding doors. We also seek ways to better construct our cavity sliding doors to ensure our customers have the latest in architectural design and material performance.


Our mission is to satisfy our customers’ needs by providing quality products and support services that are tailored to our customers’ requirements.


We are committed to becoming Australia’s leading manufacturer of quality sliding and folding door systems, providing unparalleled products and service. We strive to serve our customers and staff by developing relationships based on our core values: Honesty, Accountability, Diligence and Passion.

Core Values

Honesty: We incorporate honesty and integrity in our actions and dealings with our customers, suppliers and staff

Accountability: We hold ourselves accountable for the products and service we provide and to one another within the organisation

Diligence: Providing quality products and service on time with attention to detail every time

Passion: Enthusiasm in what we do, our products and services are important to each team member