Our Story

Our internal sliding door solutions offer a perfect balance between functionality and high class aesthetic appeal.

Triline products are engineered for quality and robustness while also addressing the specific issues faced by builders in bespoke door solutions. Whether it’s a standard sized cavity slider, or custom-made to suit your unique application, we like to work closely with you to ensure the finished product exceeds your expectations.
 We are passionate about quality and seek to provide quiet, efficient, and long lasting products you can rely on within your home or workplace.

 The Birth of Triline

The idea for Triline Quality Door Systems was born in 1996 when founder, Stuart Colledge, noticed as he was building homes 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 were outgrowing our original facility. 2005 saw us expand to a larger premises and as a result has allowed us to significantly increase our production output.

With more space and the passion to go further, 2008-2011 saw us overhaul and re-design 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 products are available in all leading hardware stores in Tasmania and a selection of stores Australia-wide.


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