About

Trethowan Heritage is an experienced consultancy specialising in the historic built environment. We seek to understand what makes a place significant and use that insight to inform its future. Our approach is grounded in authenticity, promoting traditional craftsmanship and sustainable practices. We work closely with clients across multiple sectors, delivering tailored heritage solutions that response to the specific needs of each project.

Our Story

Founded in 2001, Trethowan Heritage began as an architectural practice delivering both architectural and heritage projects across Australia.

The practice was recognised in 2015 as a joint recipient of the Victoria Architecture Award for Heritage Architecture, and again in 2023 with the John George Knight Award for Heritage.

A new chapter began in 2025 for the practice with the architectural services concluding and the focus made exclusively on heritage consultancy - continuing our commitment to the historic built environment.

Our People

Mark Stephenson
Director

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Mark is the practice director with a passion for heritage places and well-considered contextual design that enhances and supports these important places. He brings extensive experience and practical knowledge to Trethowan Heritage and each project it undertakes. He values the importance of understanding the significance of a heritage place, and uses this understanding to collaborate with owners and experts to deliver a project that not only provides for current needs, but adds to the history of the heritage place.
Our Culture

We strive to have a cooperative and comfortable working environment with staff, clients and contractors treated respectfully and acknowledged for their individual strengths. We strive to serve the personal values and aspirations of all, providing a sense of ownership and belonging.

The Christmas card

Our annual Christmas card has become a feature of the practice. Each year the card includes a tableau of the office staff and director's reimagining of an important piece of artwork. As well as Seasons Greetings, the card features a notable project(s) that was undertaken over the year and recent office news.

Browse our card image gallery below, and let us know if you would like to be added to our card list.

Like to know more?

If you have any questions about how we might work together, simply drop us a line.