Dtah

What Dtah does

DTAH is a Toronto-based multi-disciplinary design firm specializing in landscape architecture, architecture, and urban design. Founded in 1985 as the partnership du Toit Allsopp Hillier, the firm operates as a privately held studio of under 50 staff with its headquarters at 425 Adelaide St. W in Toronto's King-Spadina neighbourhood. DTAH serves three primary client segments: government and public sector agencies (City of Toronto, Waterfront Toronto, Parks Canada, National Capital Commission, CreateTO, Bank of Canada), private developers (Windmill Development, Concord Adex), and educational institutions (University of Toronto Scarborough). Notable projects include Toronto's Central Waterfront revitalization with West 8, the Evergreen Brick Works adaptive reuse, Queens Quay Boulevard, Garrison Crossing at Fort York, Flora Footbridge over the Rideau Canal, and Complete Streets Guidelines adopted by multiple Ontario municipalities.

DTAH's practice is built on cross-disciplinary integration of landscape architecture, architecture, and urban design under a single partnership. The firm's technology stack centres on digital design tools including BIM integration for landscape architecture, managed by a dedicated Senior Associate. Technical capabilities span stormwater management, heritage conservation, transit-oriented design, bridge architecture, climate resilience, and Indigenous-influenced placemaking. The firm has delivered over 200 awards for design excellence across its 50+ year history, with team members contributing more than 100 lectures at conferences and universities and projects featured in over 500 publications. Recent expansions include the Landscape Carbon Benchmarking Study for the City of Toronto and ongoing work in seven Canadian provinces.

DTAH generates revenue through project-based professional fees negotiated per engagement, acquired via competitive design competitions, RFP responses, direct commissions from government agencies and institutions, and repeat-client relationships. The firm operates as a partnership with no external private equity or venture capital ownership; the leadership team comprises Megan Torza, James Roche, Brent Raymond, Mark Langridge, Brian Brownlie, and Yvonne Lam as active Partners, with founders Robert Allsopp and John Hillier continuing as Partner Emeritus. Distribution is direct-to-client through enterprise field sales, with strategic partnerships and joint ventures (e.g., LGA Architectural Partners on Evergreen Brick Works, Kengo Kuma and Associates on Banff Avenue) extending project delivery capacity for major commissions.

Name

Dtah

Legal name

DTAH

Website

https://dtah.com

Company type

Private

Founded year

1985

Operating status

Operating

Headcount range

11–50 employees

Short description

DTAH is a Toronto-based multi-disciplinary design firm of under 50 staff specializing in landscape architecture, architecture, and urban design. It serves Canadian government agencies, private developers, and educational institutions through project-based professional fees earned via competitions, RFPs, and repeat commissions.

Ownership category

akta.pro rank

Product category

Architectural and Landscape Design Services

NAICS

Landscape Architectural Services (541320), Architectural Services (541310)

akta.pro primary industry

Landscape Architecture & Site Design (BPAHAKAC)

Keywords

• Landscape architecture services
• Urban design services
• Architectural design services
• Public realm planning
• Master planning services

Headquarters

HQ city

Toronto

HQ country

Canada

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Design Services Revenue: DTAH generates revenue through professional fees for landscape architecture, architecture, and urban design services. Projects are commissioned through competitive processes, RFPs, direct appointments, and design competitions. Revenue is project-based, earned through design fees, project management, and implementation oversight across public and private sector clients.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels6 records

Core offering

DTAH is a multi-disciplinary design firm delivering landscape architecture, architecture, and urban design services through project-based professional engagements. Services span parks, public spaces, waterfronts, streetscapes, bridges, institutional campuses, community facilities, and complete streets guidelines for municipal, institutional, and private developer clients across Canada.

Product overview

DTAH is a multi-disciplinary design firm offering architecture, landscape architecture, and urban design services through a portfolio of named projects. The firm operates as a unified studio practice rather than a platform with separate modules. Key service offerings include: (1) Landscape Architecture - park design, waterfront development, streetscapes, and public realm enhancements; (2) Architecture - adaptive reuse, institutional buildings, bridges, and community facilities; (3) Urban Design - master plans, guidelines, and public realm frameworks for municipalities. Projects are delivered across sectors including civic/institutional, residential, cultural, transportation, and environmental, with notable projects including Toronto Central Waterfront revitalization, Evergreen Brick Works adaptive reuse, Complete Streets Guidelines for multiple municipalities, and various park and public space projects across Canada.

Differentiator

Problem solved

Functional benefit

Products and services

• Landscape Architecture Services

Quantifiable outcome

• 200+ design awards received over 50+ years of practice
• +2 more outcomes

Named customers11 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Ten partnerships are on record, tiered core.

• LGA Architectural PartnerscoreStrategic or Co-development Partner · 26 March 2026DTAH and LGA Architectural Partners formed a joint venture to lead a series of campus-wide updates at Evergreen Brick Works, including the Children's Garden revitalization, new Welcome Centre, Ravine Centre, and improvements to the TD Future Cities Centre.
• Kengo Kuma and Associates (KKAA)coreStrategic or Co-development Partner · 4 February 2026DTAH collaborated with Kengo Kuma and Associates and Paul Raff Studio as part of the winning team for the 200-Block Banff Avenue Redevelopment Competition organized by Parks Canada. DTAH provided landscape architecture and urban design services as part of this international design competition team.
• Paul Raff StudiocoreStrategic or Co-development Partner · 4 February 2026DTAH collaborated with Kengo Kuma and Associates and Paul Raff Studio for the 200-Block Banff Avenue Redevelopment Competition. The team was selected as one of six shortlisted teams for Phase II of this international design competition.
• Trifos Design ConsultantscoreStrategic or Co-development PartnerDTAH collaborated with Trifos Design Consultants for the architecture and landscape architecture of Eltuek Arts Centre in Sydney, Nova Scotia. The project involved comprehensive revitalization of a 130-year-old former Convent and school into a vibrant arts centre.
• West 8coreStrategic or Co-development PartnerDTAH together with West 8 was awarded the Central Waterfront Innovation Design project through an international competition. The partnership transformed Toronto's waterfront into a world-class destination, delivering award-winning design through multiple phases to successful implementation.
• Dufferin Construction and PedeltacoreStrategic or Co-development PartnerDTAH was part of the winning team led by Dufferin Construction and Pedelta for the Garrison Crossing project at Fort York. DTAH was responsible for bridge architecture and landscape design in this innovative competitive design-build process.
• Diamond Schmitt ArchitectscoreStrategic or Co-development PartnerDiamond Schmitt Architects designed the Guelph Public Library Branch as part of the Baker District Redevelopment project led by DTAH. This One Planet Living endorsed development includes two residential towers and comprehensive public realm design by DTAH.
• StanteccoreImplementation/ SI/ Consulting PartnerStantec served as the lead engineering consultant for the Glen Road Pedestrian Bridge and Tunnel project, with DTAH providing bridge architecture and urban design advisory services.
• City of BramptoncoreImplementation/ SI/ Consulting PartnerDTAH developed the Downtown Brampton Public Realm Plan and Streetscape Manual as a component of the City of Brampton Integrated Downtown Plan, guiding future growth and strategic investment until 2051.
• City of TorontocoreImplementation/ SI/ Consulting PartnerDTAH prepared the Toronto Complete Street Guidelines and was subsequently selected to lead the implementation of the Green Line. Ongoing partnership with City on multiple urban design and landscape architecture projects.

Scale indicators4 records

Recent moves8 records

Expansion highlights5 records

Direct peers

• Claude Cormier + Associés: Montreal-based landscape architecture firm known for award-winning public parks and plazas across Canada. Closely comparable on craft, public sector engagement, and high-profile Canadian urban design commissions.
• PFS Studio: Vancouver-based landscape architecture, urban design, and planning firm with comparable scope across parks, campuses, and public infrastructure. Similar Canadian footprint and municipal client mix to DTAH.
• Janet Rosenberg & Studio: Toronto-based landscape architecture and urban design studio with a comparable public-sector and institutional client base. Directly overlaps with DTAH on civic parks, streetscapes, and waterfront work in the Greater Toronto Area.
• Public Work: Canadian landscape architecture and urban design practice with a similar multi-disciplinary studio model and public realm focus. Competes with DTAH on park, waterfront, and streetscape commissions across Canada.

Broad incumbents

• James Corner Field Operations: Internationally prominent landscape architecture and urban design practice behind major waterfront and park projects. Comparable to DTAH on megaproject public realm work and design competition leadership.
• OLIN: Philadelphia-based landscape architecture, urban design, and planning studio known for high-profile public realm work. Comparable to DTAH on craft and public sector commissions; broader international footprint.
• SWA Group: Large, internationally recognized landscape architecture and urban design firm with deep experience on waterfronts, campuses, and public realm. A broader incumbent competing with DTAH on the largest, most prestigious Canadian and international commissions.
• Michael Van Valkenburgh Associates: Brooklyn-based landscape architecture firm recognized for landmark park and waterfront projects. Comparable to DTAH on signature public realm design and competition-based procurement wins.
• Sasaki Associates: International design practice spanning landscape architecture, urban planning, architecture, and civil engineering. Comparable to DTAH on integrated design for campuses, waterfronts, and urban districts, though at materially larger scale.

Regional players

• Diamond Schmitt Architects: Major Canadian architecture firm with significant civic, institutional, and library portfolio. Frequently partners with DTAH on mixed-use and civic projects and competes for overlapping public sector commissions in Canada.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/DTAHtoronto
• LinkedInca.linkedin.com/company/dtah
• Instagraminstagram.com/dtahtoronto

Revenue estimate

Valuation estimate

Number of profiles

Profiles9 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Dtah