Building a new Department of Homeland Security headquarters is not only taking extra years, but extra billions of taxpayer dollars.

A new staff report from Rep. Jeff Duncan, R-S.C., chairman of the House Subcommittee on Oversight and Management Efficiency, says a "reality check" is needed about the escalating costs and delays of the new DHS headquarters.

A former portion of the Saint Elizabeth's mental hospital campus in southeastern Washington, D.C., was chosen in 2006 for the new consolidated headquarters, to "build cohesiveness among Department components," the report says. The project has received $1.3 billion in funding to date, though only the U.S. Coast Guard headquarters has been completed.

DHS has also pushed back the completion date of the entire facility, which includes new senior leadership offices and other operations, to 2026 — 10 years beyond the originally scheduled finish time.

That's not all, however. An additional $3.2 billion will be needed, the report claims, adding to the 30 percent in increased costs due to delays.

“With our nation $17 trillion in debt, we cannot afford waste and frivolous spending," Duncan said.

Read the full report here.