Aircraft manufacturer Boeing is laying the groundwork for a major expansion in St. Louis, according to a June 5 news release.

The Arlington, Virginia-based company tapped Jacobs to deliver design, engineering and environmental services for a 1.1-million-square-foot build-out. The project includes new advanced assembly facilities and a post-assembly operations center, according to the release.

While Jacobs did not disclose contract terms, the St. Louis Economic Development Partnership pegged Boeing’s broader investment at $1.8 billion.

Construction is already underway and will be completed in multiple phases between 2026 and 2030, according to Jacobs. The Dallas-based contractor secured federal environmental approvals for the project in eight months, amid broader efforts to speed up permitting requirements for defense and infrastructure work.

Scope of work also includes demolition of existing structures to prepare the site for new classified facilities, said Susannah Kerr, Jacobs’ executive vice president and general manager of federal and environment business, in the release.

Once complete, the expanded campus will support the production of future-generation aircraft, said Mark Webb, Boeing’s vice president of site readiness in St. Louis.

“The largest investments Boeing is making in defense is in St. Louis,” said Webb, who noted the facility will feature advancements in digital design and manufacturing. “Our St. Louis site will continue to grow in facilities and head count for the next several years.”