Respected accredited designer Diane Ernjakovic is the Founder and Principal Designer at One Three Design Inc. With over a decade of experience in both residential and commercial design, this design firm continues to grow known for creating stylish and functional environments that reflect clients’ personal lifestyles and workplace needs.

Diane have also participated in several charities and fundraisers including The Furniture Bank, Eva’s Initiatives and Ladies out Laughing, and have recently been published in the book “The Complete Book of Clean”.

“Good design will have you never wanting to leave”


Diane Ernjakovic

Principal Designer
ARIDO intern, LEED AP

Growing up in Hamilton, when it was still steeltown, Diane learned to be a straight shooter which serves her well in offering a realistic and honest approach to the design and construction process.

After graduating from Sheridan College with an Interior Design Diploma High Hons., Diane worked in the field of retail and commercial design for nearly a decade completing projects ranging in 5,000-50,000 sqft, before joining her partner to form One Three Design Inc. Diane has also taught part time in the Sheridan College Interior Decorating Diploma program.

In a shift to more residential projects, she has enjoyed the personal connection to homeowners and the joy it brings to both her and the clients. Diane has an affinity towards bright, clean design with attention to details and a subtle feminine touch.

As a mother of two young girls, entrepreneur, charity supporter, mentor and organization-junkie, Diane is a believer that there is always a way to make things happen.