1. Short title This Act may be cited as the Stop Unfair Bid Shopping Act of 2019 or the SUBS Act . 2. Requirement to notify Government of changes to subcontractors under construction contracts (a) Requirement An agency awarding a construction contract using sealed bid procedures in an amount greater than $1,500,000 shall— (1) require an offeror for the contract to include a list in the offer that includes— (A) each subcontractor that the offeror intends to use in the performance of the contract, for any subcontract expected to be awarded in excess of $100,000; and (B) any work estimated to cost in excess of $100,000 that will solely be performed by the prime contractor for the contract; (2) include a clause in the contract requiring that the prime contractor shall submit to the agency a written notification of— (A) any subcontractor substituted after the award of the contract for a subcontractor listed under paragraph (1)(A), along with an updated estimate for the cost of performing the work associated with the substituted subcontractor; and (B) any subcontract entered into for work listed under paragraph (1)(B). (b) Modification to contract In the case of a construction contract covered by subsection (a), if the prime contractor notifies the agency of a substituted subcontractor under subsection (a)(2) and the cost of performing the work associated with the substituted contractor is estimated to cost 10 percent or greater less than the cost for performing such work as bid, the contracting officer for the contract may modify the contract to reduce the amount of the contract award to take into account the substitution of subcontractor. (c) Agency defined In this section, the term agency — (1) has the meaning given the term executive agency in section 133 of title 41, United States Code; (2) does not include the Department of Defense or any military department