Engineering the infrastructure that Ontario communities depend on.
Tatham Engineering is a 100% employee-owned consulting engineering firm. From six offices across the province, we provide municipal infrastructure, building engineering, water and environmental, land development and field services to public and private sector clients.
Design review at the Collingwood head office.
A multidisciplinary practice built around long-term client relationships.
Tatham Engineering has practised continuously in Ontario since 1988. What began as a small municipal engineering office has grown into a firm of more than 180 engineers, technologists, surveyors and administrative professionals working across thirteen technical disciplines.
Because the firm is entirely owned by its employees, the individuals accountable for your project are also accountable for the reputation of the business. That alignment informs how we assign staff, manage budgets and stand behind our work.
Five practice areas. Thirteen technical disciplines.
Our disciplines are organized so that a single project team can carry an assignment from feasibility study and approvals through detailed design, tendering, construction administration and commissioning.
Infrastructure
Planning, design and contract administration for municipal infrastructure — from structural rehabilitation of bridges and culverts to full corridor reconstruction and water servicing.
Building Engineering Services
Integrated electrical, mechanical and structural engineering for institutional, municipal and commercial buildings, supported by specialist practices in acoustics, air quality and decarbonization.
Water & Environment
Science-based engineering along the shoreline and below the ground surface, protecting water resources while enabling responsible development.
Community Development
Full-service land development engineering that advances residential, commercial and institutional projects from concept plan through registration and servicing.
Field Services
Field capability that connects design intent to constructed reality, from initial topographic survey through final inspection and substantial performance.
Representative assignments
Dunlop Street East Revitalization
Reconstruction of a principal downtown corridor, combining full municipal servicing renewal with a redesigned pedestrian realm and streetscape.
Shanty Bay Park Low-Impact Development Pilot
A demonstration low-impact development installation providing infiltration and water quality treatment ahead of discharge to Lake Simcoe.
Big Sound Marina Dock B
Structural and marine engineering for the replacement of a municipal dock facility on Georgian Bay, delivered within a constrained in-water works window.
Independently recognized work.
Our project teams and workplace practices have been recognized by industry associations, conservation authorities and clients across the province.
Award of Excellence
Association of Consulting Engineering Companies – Ontario
Conservation Award
Lake Simcoe Region Conservation Authority
Sustainability Leadership Award
Sustainable Severn Sound
Service Excellence and Outstanding Contribution
CBRE
Building Initiatives Award
Economic Developers Council of Ontario
Canada’s Top Small & Medium Employers
2026 National Competition
Staff volunteering at a community environmental initiative.
Six offices, one project team
Regional offices place our staff close to the communities they serve, while shared systems allow any discipline in the firm to be assigned to a project regardless of location.
Discuss an upcoming assignment
For proposal requests, project enquiries or general information, contact our head office or the regional office nearest to your project. We respond to all enquiries during regular business hours.