An employee-owned Ontario engineering practice.
Tatham Engineering Limited has provided consulting engineering services to Ontario municipalities, institutions and private sector clients continuously since 1988.
Founded in 1988. Owned by the people who do the work.
The firm was established to provide municipal engineering services to communities in Simcoe County and the surrounding region. Over the following three and a half decades the practice expanded both geographically and technically, adding offices in Barrie, Bracebridge, Orillia, Guelph and Ottawa, and building specialist capability in building engineering, hydrogeology, coastal engineering, acoustics and decarbonization.
Tatham Engineering is 100% employee-owned. Ownership is held by the professionals who deliver the work, which keeps decision-making close to our projects and aligns the long-term interests of the firm with those of our clients.
Today more than 180 staff practise from six Ontario offices, supported by common design standards, quality assurance procedures and project management systems across all locations.
Field staff mobilizing for topographic survey work.
The standards we hold ourselves to
These nine principles are used in hiring, in performance review and in the way project teams are held accountable for their work.
Ownership
We assume responsibility for our clients’ objectives and treat them as our own.
Service
We deliver dependable, technically sound work on every assignment we accept.
Relationships
We build enduring professional partnerships intended to last well beyond a single project.
Empowerment
We give our people the latitude to develop innovative, cost-effective engineering solutions.
Team
We draw on the full resources of the firm so that each client receives the appropriate expertise.
Communication
We maintain clear, timely and documented communication across every project we undertake.
Development
We invest in the continued technical and professional development of our staff.
Professionalism
We hold ourselves to a high standard of conduct, diligence and presentation.
Community
We contribute to the communities in which we live and practise.
Independent recognition of our work
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
Directors, officers and discipline managers
Each technical discipline is led by a manager accountable for quality, resourcing and professional standards within that practice.
Staff at a community environmental initiative.
Practising in the communities where we live.
Our offices are located in the municipalities we serve. Staff participate in local conservation initiatives, sit on community boards and support regional charitable organizations, and the firm contributes annually to community programs across our service area.
This proximity has a practical benefit as well: our project managers understand local approval processes, standards and site conditions because they work within them continuously.
Where we practise
Collingwood
115 Sandford Fleming Drive, Suite 200
Collingwood, ON L9Y 5A6
Barrie
645 Veterans Drive, Unit D
Barrie, ON L4N 9H8
Bracebridge
8 Barron Drive
Bracebridge, ON P1L 0H3
Guelph
546 Governors Road, Unit 100
Guelph, ON N1K 1E3
Orillia
10 Diana Drive, Unit 7
Orillia, ON L3V 8K8
Ottawa
5335 Canotek Road, Unit 100
Ottawa, ON K1J 9L4