Welcome to Christiansen O’Brien, an esteemed architectural firm based in Sydney, established in 2005.
Our practice offers a wealth of knowledge and expertise across commercial, retail, and public sectors.

Our commitment is to deliver significant value through architecture that aligns with the varied values of the individuals and communities we serve. With a team of experienced professionals, we are dedicated to applying our extensive design skills effectively and consistently. Our focus remains steadfast on making a positive contribution to our clients, communities, and the broader culture.

We invite you to join us on this journey as we employ our innovative approach and dedication to excellence to transform spaces, enhance lives and make a durable impact on the built environment.