Congressional Budget Office Cost Estimate: H.R. 1232, Rescinding DHS' Waiver Authority for Border Wall Act [open pdf - 29KB]
From the Document: "Current law authorizes the Department of Homeland Security (DHS) to waive all state, local, and federal laws--including environmental and land management laws, for example--as necessary to expedite the construction of barriers and roads near United States borders. The department has exercised its waiver authority in recent years, including in 2018 and 2019. H.R. 1232 would repeal this authority for any future construction."
Congressional Budget Office: http://www.cbo.gov/