We share a profound commitment to contextual, responsible, meaningful and beautiful design.

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.


DTAH has been designing landscapes, buildings and communities for over 40 years.

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

The building and unique site speak directly to our design philosophy, which for over four decades has worked to respect, preserve, and enhance the public realm, while celebrating the intersection of built and natural form.

Selected Clients

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


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

188 Awards

Recent Awards

Design Review Panel Hall of Fame Award, the WaveDecks

  • Waterfront Toronto

Award of Merit – Large Building Category, Lieutenant Governor's Award for Excellence in Architecture, Eltuek Arts Centre

  • Nova Scotia Association of Architects

Design Excellence Award, Tommy Thompson Park Pavilion

  • Ontario Association of Architects

Architectural Merit - Cast in Place, Tommy Thompson Park Pavilion

  • Ontario Concrete Awards

National Award of Excellence, Mississauga Reimagining the Mall

  • Canadian Institute of Planners

Built Heritage Award, Eltuek Arts Centre

  • Heritage Trust Nova Scotia

Design Excellence Award, Senate of Canada Building

  • Ontario Association of Architects

Over 100 Lectures

Select Lectures

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

BRIDGE Conference, Ironbridge, 2017

  • New Bridges in a Canadian World Heritage Site – An Architect’s Perspective

Over 500 Publications

Select Articles

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

The Globe and Mail, April 13, 2021

  • Toronto pavilion serves as urban park’s new front door

The Globe and Mail, February 7, 2020

  • The Don Valley should be a park first - not a parkway

While our capabilities are broad, we cultivate a culture that seeks a profound understanding of our craft and supports the pursuit of excellence at every level.

See Our Work