With over 3800 completed projects, we think we have it right…

Founded in 1971, The Design Associates has grown into one of Canada’s foremost commercial office interior design and planning firms. Our founders had a vision to build a company that offered much more than just design to clients. TDA offers a unique “one-stop” office interior design and planning solution not found anywhere, including commercial interior design, strategic space planning, office location + expansion consulting, construction project management, furniture selection + procurement, consulting for real estate agents, client advocacy services and move planning + co-ordination. We’re well known for our exceptional leadership, project management and advocacy skills. We provide only the highest quality planning and design solutions. Our brand is about dramatically enhancing the work environments of our clients, including commercial office centres, building owners, property managers, crown corporations, high tech companies and professional firms. From its head office in Ottawa, TDA serves clients throughout Ottawa, Toronto and the Greater Toronto Area, Montreal, Calgary, Edmonton, Winnipeg, Quebec, Regina, Saskatoon, Vancouver and the Greater Vancouver Area, the East Coast including Halifax and major U.S. cities such as Dallas and Atlanta.

Commercial Office Interior Design and Planning Services

Office Interior Design

Commercial Interior Design

TDA is a Canada’s foremost leader in commercial interior office design. From concept drawings and 3D renderings, to design concepts and finishes, we’ll transform your space into an environment that your staff will be inspired to work in. A design by TDA is sure to increase communication, productivity and foster team spirit.

Strategic Space Planning

Every successful new office begins with a sound strategic space plan. TDA analyzes our clients’ work cultures and conducts employee interviews to lay the foundation for this plan. Our services also include space requirement analyses, work station assessments and time and cost projections.

Office Relocation Service + Expansion Consulting

TDA specializes in helping clients plan their next office move or expansion. We will prepare needs analyses, feasibility studies, tenant improvement budgets, project timetables, location and alternate building assessments with final recommendations.

Office Redesign + Change Management

TDA has many years of experience helping clients manage change in their workplace. Whether you are looking to expand or relocate, redesign existing space, update your look and feel, TDA has your one-stop, process driven process.

Commercial Interior Design
Office Design

Furniture Selection + Procurement

Based on our commercial office design for your new space, TDA will reuse existing furniture, fixtures, partitions and equipment and, if needed, we will select new assets and source them from the most cost effective vendors.

Construction Project Management

We will manage your next office construction project from beginning to end as the single source of responsibility. Our construction project management and administration services include preparing construction drawings and specifications, obtaining building permits, preparing and supervising tenders for contractors and vendors, obtaining landlord approvals and more.

Client Advocacy Services

For clients who do not have a full time in-house facilities manager TDA offers the perfect solution. We work as your extended team, providing you with our 45 years of experience managing over 3800 projects. Clients call upon us to be their Advocate and independent Advisor. Our knowledge of the industry make us an ideal choice. TDA is the engine that drives our clients’ projects from inception to completion.

Move Planning + Coordination

TDA will develop a comprehensive plan to move your office, prepare the proposals for the moving companies, select the best vendor, supervise the movers on-site and provide inspection services upon completion.

Commercial Design Company
Ottawa Interior Design Company

Over 45 Years of Experience Delivering Innovative Office Interior Design and Planning Solutions


“The Design Associates led an exemplary team dedicated to the management of the project. We have found their work to be of consistently high quality. We would recommend TDA for any project. The work was done so well, that we also recommended their services to the Canadian Tourism Commission.”
– Louis-Bernard Bonneau, Leasing Manager, Manulife Financial

“We were very impressed with the level of expertise, attention to details, quality of the office space and consistently high standards demonstrated by the design team. Based on our experience with The Design Associates, we would not hesitate to recommend this firm for a wide variety of design challenges.”
– Tom Graham, Manager FMD-NCA, Department of Justice

“TDA provided interior design services for the building upgrade and fit-up of the tower at 100 Metcalfe. This project accommodated the Solicitor General, Correctional Services Canada, Justice Canada, the Auditor General and the DND Ombudsman. TDA provided quality design solutions and quality inspection services during construction.”
– Andre Lambert, Vice President Engineering & Development, Urbandale Corporation

Recent Projects


Illluminating Engineering SocietyAssocoation of Registered Interior Designers of OntarioInterior Designers of CanadaNational Council for Interior Design QualificationsAssociation Professionnelle des designers d'interieur du QuebecAmerican Society of Interior Designers