Respected accredited designers Diane Ernjakovic and Rachel Keach are Founders and Principal Designers at One Three Design Inc. With over a decade of experience in both residential and commercial design this boutique interior design firm continues to grow known for creating stylish and functional environments that reflect your personal lifestyles and workplace needs.

"Good design will have you never wanting to leave."


Rachel Keach

Principal Interior Designer
ARIDO, IDC, NCIDQ

Rachel's design expertise and creativity has contributed to the success of One Three Design Inc. and their fast growing client list. Her diverse background includes retail and residential design, as well as designing sets for film and television productions in Toronto.

Rachel is known for her ability to interpret the client’s needs and deliver function and beauty within her solutions. Her attention to detail and her desire to push the envelope attest to why she is a highly acclaimed designer.


Diane Ernjakovic

Principal Designer
ARIDO intern, IDC, LEED AP

With an accomplished background in corporate commercial and residential design, Diane brings the best of both worlds to the team. Her experience also includes working on HGTV, teaching at Sheridan College and mentoring future design grads.

Diane is passionate about great design, why design matters and how it connects people and spaces. She is recognized for her outstanding project management and borderless creativity.