Industry-Leading. Award-Winning. Excellence Beyond Expectations.

As one of the largest architecture, engineering, planning, and interior design firms in the United States, LEO A DALY is a leader in the design of the built environment. We draw on our rich history, dedication to design excellence and an unyielding focus on quality to create exceptional spaces that enhance and enrich the human experience.

Since 1915, we have been providing excellence beyond our clients’​ expectations. Our diverse portfolio includes award-winning work in a range of industries in more than 91 countries, all 50 US states and the District of Columbia.

Our privately held practice has more than 400 architecture, engineering, planning, and interior design professionals in nine offices worldwide. Encouraged by a legacy of innovative leadership and the resources of a large firm, our inspired professionals work creatively in flexible teams, which are customized specifically for each project.