TKDA is your single source for engineering, architectural and planning services to help you realize your vision and meet your schedule and budget. Founded in 1910 in Saint Paul, and now with offices in Duluth, TKDA is known for establishing long-term relationships with our clients. In fact, 80 percent of our work comes from repeat business. We are 100-percent employee owned, and each of our employee-owners is passionate about delivering the highest standards of excellence. We provide integrated design services for a diverse market sector, including transportation, government, energy, water, and mining.