Who We Are

DTAH is committed to design with a conscience. We stand up for what we believe in. We care about undertaking work that is socially inclusive and relevant, and that contributes to the betterment of our cities and communities.

How We Work

Collaboratively. We believe that the most successful projects are a result of open, honest and continuous dialogue between all parties involved – our client, design team, consultants, other stakeholders, and the community at large. Within the studio, collaboration between senior and junior staff encourages design innovation while providing great mentorship to the young and talented studio team.

What We Do

We aim to deliver projects that are greater than the sum of their parts, which enhance the lives of their users, as well as honour their specific environments and surrounding communities. Project delivery is our strength, and respecting both schedule and budget is essential to the success of every assignment.

Legacy

DTAH has been designing landscapes, buildings and communities for over 50 years.

1970’s Staff poses outside the Colborne St. Studio – the first home of the firm.

Group photo of people standing on steps in front of low rise brick building with DTAH sign beside glass front door. — The DTAH Studio at 50 Park Road

Aerial view of people sitting on triangular wooden platform in a park — 2024 You can now find us at 425 Adelaide St. W, Suite 600. DTAH looks forward to the next chapter in Toronto's King-Spadina neighbourhood.

Selected Clients

Over the decades, DTAH has worked on hundreds of projects in both the public and private sector.

Recognition

We seek excellence in all dimensions of our work, and have established a solid reputation for providing insightful design solutions for complex problems.

200+ Awards

Recent Awards

Award of Excellence - Vision, Master Plans, and Large Places Design and Best Overall Project, Brampton Riverwalk

Brampton Urban Design Awards

Award of Excellence - Small Open Spaces, Bloor-Annex BIA Parkettes

Toronto Urban Design Awards

Award of Excellence - Public Buildings in Context, Tommy Thompson Park Entrance and Pavilion

Toronto Urban Design Awards

National Award of Excellence, St. Andrew's Playground Park

Canadian Society of Landscape Architects

National Award of Excellence, Brampton Riverwalk

Canadian Society of Landscape Architects

Design Review Panel Hall of Fame Award, the WaveDecks

Waterfront Toronto

Design Excellence Award, Tommy Thompson Park Pavilion

Ontario Association of Architects

Over 100 Lectures

Select Lectures

CSLA Congress, Saskatoon, 2023

Emerging Cities Leading the Way for Restorative Landscapes

OALA-OPPI, London, 2022

Up High, Down Low: Master Plans to Details

Footbridge Conference, Madrid, 2022

Two Modern Crossings in Historic Canadian Places: Creating 'Places for People'

RAIC Virtual Conference on Architecture, 2022

Innovation Wins: Behind the Scenes of Design Competitions for Institutional Clients
City of Our Immediate Future: Mapping Intensification in Toronto

National Trust Conference, Winnipeg, 2019

Master Planning New Development in Heritage Contexts

IDS, Toronto, 2017

Memory, Change, and Design for the Public Good

Over 500 Publications

Select Articles

The Globe and Mail, May 28, 2024

In Niagara Falls, The Exchange offers a cultural hub for tourists and locals alike

Landscapes Paysages Magazine, Spring 2024

A Letter to Bob Allsopp

Landscapes Paysages Magazine, Winter 2021

Changing Mindsets: Creating Sustainable and Equitable Urban Landscapes

Landscapes Paysages Magazine, Fall 2021

21st Century Waterfronts: Resilient, Integrated, Inspiring + Transformative

Canadian Architect, April 19, 2021

Tommy Thompson Entrance Pavilion opens to the public