Trethowan is an architecture, interiors and heritage practice with a record of excellent projects and people.

Our Story

Founded in 2001, we are an architecture practice that engages in bespoke projects across Australia, specialising in heritage and its related disciplines.

Our People

Mark Stephenson

Mark is the heritage 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 and each project. 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.

Iain Nicol

Starting with Trethowan in 2007, Iain Nicol has helped to shape the direction of the firm and its architectural response to buildings within a heritage context. As the architectural practice director, he has fostered the growth and development of the passionate and talented architects and designers that form the architectural team at Trethowan. He has a contemporary approach to architecture, with a heritage sensitivity.

Claire Miller

Claire joined Trethowan’s heritage team in 2015, coming from an architectural background with a particular interest in historic buildings. She brings extensive academic experience to her role, utilising research and analytical skills to provide advice and assessments on a range of project types and scales. Her approach to heritage is to advocate for significant buildings and to negotiate positive outcomes for all stakeholders by balancing contemporary needs and historic sensitivity.

As associate, Claire supports the strategic direction of the practice, and the growth and development of the heritage team as industry leaders. This role allows Claire to foster positive relationships with clients, authorities, and consultants in a collaborative approach to managing heritage places.

Priyan Perera

Priyan joined Trethowan in 2014 and has since led a variety of high-end residential, commercial & heritage-related projects; actively liaising with clients, consultants & contractors through all stages of the architectural process. He has been integral in Trethowan’s adoption of new systems and technologies all aimed at expanding the capabilities and efficiency of our office.

Outside of Architecture Priyan maintains a passion for graphic, furniture, and industrial design, which inform a holistic and multidisciplinary approach to all of his architectural projects, regardless of type and scale.

As associate, Priyan continues his research into growing and improving office standards and internal procedures. Leading internal working groups created to collaborate, share knowledge, and assist in the development and upskilling of his colleagues.
Our Culture

We strive to have a cooperative and comfortable working environment with staff and directors, clients and contractors treated respectfully and acknowledged for their individual strengths. This outcome is derived from an office hierarchy that is as flat as possible. We strive to attend to 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 directors making a tableau derived from an important work of art. As well as Seasons greetings, the card features a notable project that was constructed 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.