Buy-down Posted on 4th November 201531st March 2021 by ThePD (The Project Definition) A Buy-down is a negotiated price or reduced cost. Related Definitions in the Project: The Procurement Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Related Posted in Procurement and tagged cost, estimate, procurement. ThePD (The Project Definition) ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.