Navigating the permitting process in Washington, D.C. can feel overwhelming, especially when multiple agencies are involved in reviewing and approving your project. Whether you're planning a simple home renovation or a complex commercial development, understanding which agencies to contact and when can save you significant time and frustration. This comprehensive guide provides all the essential contact information and details about each agency's role in the permitting process.

Washington, D.C.'s building regulation history begins with the city itself. When Pierre L'Enfant designed the federal city in 1791, building oversight was minimal and largely focused on ensuring structures aligned with the grand urban plan. However, as the city grew beyond its initial federal core, the need for systematic building regulation became apparent.