Air Force, Northrop Break Ground on $4.5B B-21 Assembly Expansion

October 14, 2026

Air Force and Northrop Grumman officials at the B-21 final assembly facility construction site at Plant 42 in Palmdale, California | Westside Construction Group

The U.S. Department of the Air Force and Northrop Grumman have broken ground on a new final assembly facility for the B-21 Raider stealth bomber at Air Force Plant 42 in Palmdale, California, a project that adds more than 1 million square feet of production space and is backed by $4.5 billion in federal funding, according to Construction Dive. The expansion is designed to raise annual B-21 production capacity by 25 percent.

What Happened

The groundbreaking was announced in an October 8 news release, and Construction Dive reported on the project on October 13. A photo released with the announcement shows Air Force and Northrop Grumman officials at the Palmdale construction site on September 29 Construction Dive. Military Times, which reported the news on October 8, described the groundbreaking as having taken place the previous month Military Times.

The new building will serve as a final assembly line for the B-21 and will add more than 1 million square feet of facilities at Plant 42 Manufacturing Dive. The project follows an agreement the Air Force and Northrop Grumman finalized in February 2026 to expand B-21 manufacturing capacity Airforce Technology.

Funding and Program Context

The Air Force is using $4.5 billion authorized and appropriated under fiscal 2025 reconciliation legislation to accelerate production toward an approved acquisition profile of 100 B-21 aircraft Airforce Technology. Construction Dive identifies that legislation as the One Big Beautiful Bill Construction Dive. Military Times reports that the B-21 portfolio calls for at least 100 aircraft and that the companies agreed to raise annual production capacity by 25 percent while prioritizing cost, schedule and performance Military Times.

The B-21 first flew in 2023 and remains in flight testing. It is intended to replace the B-1B Lancer and B-2 Spirit fleets over the coming decades Military Times. The Air Force says the program remains on schedule, with the first operational aircraft expected at Ellsworth Air Force Base in South Dakota in 2027 Airforce Technology.

Construction work tied to the program is not limited to California. Separately, Conti Federal received a $49.8 million contract to build 80 environmental protection shelters at Ellsworth Air Force Base as part of preparations for the bomber's arrival Airforce Technology.

What Officials Said

Gen. Dale White, the Air Force's director of critical major weapon systems, said the groundbreaking "represents a sustained commitment to delivering the capability our nation needs" and called the B-21 foundational to the service's future long-range strike capability Military Times.

Col. Nicholas Jordan, B-21 Systems program director at the Rapid Capabilities Office, said the team "has established the foundation to accelerate production responsibly" and that the Palmdale investment will provide the infrastructure, workforce and manufacturing capacity needed to deliver the aircraft at a higher rate Airforce Technology. Air Force Secretary Troy Meink also marked the groundbreaking in a social media post Military Times.

Part of a Wider Defense Construction Run

The Palmdale project is one of several large defense-related construction starts this fall. Construction Dive notes that a JE Dunn and Alberici joint venture broke ground on September 30 on a greenfield shipyard in Texas valued at more than $3.2 billion, described as the first such shipyard built in the United States since World War II. WCG covered that groundbreaking here. Turner Construction, Granite Construction, Skanska and Tutor Perini have also reported recent military construction contract wins Manufacturing Dive.

Implications for Owners, Developers, Contractors and Subs

Aerospace manufacturing space at scale. Aircraft final assembly buildings of more than 1 million square feet typically involve heavy structural steel, large clear spans, high-capacity power and controlled environmental systems. Firms with secure-facility and aerospace experience are best positioned.
Federal reconciliation money is reaching the ground. The $4.5 billion from fiscal 2025 reconciliation legislation is now funding physical construction, a signal that other defense production projects backed by the same law may follow.
Downstream base work. Basing preparations such as the $49.8 million shelter contract at Ellsworth show that weapons programs generate construction well beyond the factory, including shelters and support facilities at operating bases.
Labor competition. With multiple billion-dollar defense starts underway, demand for cleared workers, electricians and skilled trades on federal work is likely to stay strong.

What to Watch

Release of contractor and subcontractor details for the Plant 42 assembly building.
The construction schedule relative to the 2027 delivery of the first operational B-21 to Ellsworth Air Force Base.
Additional basing and support facility contracts at Ellsworth and other future B-21 locations.
Further defense production facility starts funded through the same reconciliation legislation.

Bottom Line

The B-21 final assembly expansion at Plant 42 is a $4.5 billion bet on faster bomber production and a major aerospace manufacturing construction start. For contractors, it adds to a growing list of defense industrial projects where federal funding is already committed and the work is moving from announcement to site.

Image credit: Courtesy of Northrop Grumman / U.S. Air Force, via Construction Dive. Image from the source article.