Our Story

Established in 2005, MOSS SUND Architects is a boutique architecture firm located in the bustling Leslieville neighbourhood of Toronto, that specializes in modern, environmentally conscious design. Led by principals Carolyn Moss and Simona Sund, the firm’s work and reputation now spans the country.

The creative team brings a synergy of experience, ingenuity and collaboration to your project. Whether designing a wellness center, a medical facility, a commercial building or a custom home, the underlying goal remains the same: to leverage our creative skills and network of consultants and contractors to create the best possible solution for our clients.

For each project we take a wide range of input, from client vision and budget, to building codes, materials, energy efficiency, zoning by-laws, building science and constructability and bring them together to create what seems like an effortless, elegant outcome – it’s architectural alchemy and it’s what we love to do.

Grounded in expertise and driven by passion, the MOSS SUND team are engaged in every aspect of the project, from pre-design to permit and contract applications through to construction and hand-over.  Friendly and easy to work with, meticulous and focused, we are committed to the success of your project.

MOSS SUND is proud of the work we have done for our clients over the years and look forward to working with you on your project!


MOSS SUND takes great pride in the long-standing partnerships they have established with many of their clients.


Campbellford Memorial Hospital

Children’s Hospital of Eastern Ontario

Grand River Hospital

Halton Healthcare – Oakville Trafalgar Memorial Hospital

Hamilton Health Sciences – Hamilton General Hospital

Hamilton Health Sciences – Juravinski Cancer Centre

Headwaters Health Care Centre

Joseph Brant Hospital

Kingston Health Sciences Centre – Kingston General Hospital

Kingston MRI

Lakeridge Health Oshawa Hospital

Lakeridge Health Bowmanville Hospital

Niagara Health System – St. Catharines General Hospital

North Bay Regional Health Centre

Pembroke Regional Hospital

Quinte Health Care – Belleville General Hospital

Scarborough Health Network – Rouge Valley Centenary Hospital

Scarborough Health Network – Scarborough General Hospital

St. Joseph’s General Hospital Elliot Lake

St. Joseph’s Health Centre Toronto

Strathroy General Hospital

Sunnybrook Health Sciences Centre

Trillium Health Partners – The Credit Valley Hospital

Trillium Health Partners – Mississauga Hospital

Toronto Cardiac Clinic

Unity Health Toronto – St. Michael’s Hospital

University Health Network – Toronto Rehabilitation Institute

University Health Network – Toronto Western Hospital

West Park Healthcare Centre

Women’s College Hospital

X-RAY Associates

York Central Hospital


Dallington Pollinators Community Group

Harmony Dawn Retreat Centre

Hugh Garner Housing Co-op Green Roof

King Yoga

Rennaissance Yoga

Tai Chi Meditation Centre

The Royal Canadian Yacht Club (RCYC)

YMCA of Greater Toronto



Le Chateau


The Body Shop


City of Toronto

Company B Communications


Provincial Roofing

University of Toronto

University of Toronto Mississauga

Lakefield College School

Meet The Team

Carolyn Moss
Carolyn Moss

Co-Founder, Principal Architect

Simona Sund
Simona Sund

Co-Founder, Principal Architect

Paul Gorrie

Senior Project Manager

Laura Liu

Project Manager

Victoria Morwick
Victoria Morwick

Office Manager

Thank You!!

Just a note to share a sincere thank you for the work you did on our stairs. We’re listing our house this week and pulled out all the old plans – you brought so many great ideas to the table and we’ve been so proud of the work you’ve done!

Tanya Toronto, ON

Thanks Moss Sund

We’re looking forward to seeing this come to life. So far you’ve made what could be a really stressful process seem easy. Thanks Moss Sund!

Jana & Peter Toronto, ON

Thank You!

It’s been a wonderful summer for being up here, and I am now so happy that we did this project! It’s been a perfect escape from the pandemic constraints of urban life.

Sheila Muskoka, ON

Very Happy!

Susie and I are very happy with the results to date. Its been a challenge to get this thing done but we really appreciate your help and advice on top of your architectural skills.

Leo Toronto, ON


THE HOUSE IS FANTASTIC!!! You have created something extraordinary. There are days when I am close to tears at how lovely it is -sounds so sappy I know, but true nonetheless.

Stephanie Toronto, ON