It depends. Depending on the location of the project, nature of the property, the code requirements of the AHJ, and the surrounding area, there may be numerous prerequisites and credits in LEED that a project is already meeting without making change orders or adding scopes of work.  If a project is in a high density area with a stringent local code, LEED baseline certification is not going to be a big lift. However if a project is in a low density or even a rural area with more lenient building codes, there will likely be more items to change and add.  The number one thing that will make LEED certification easier for all involved, is if an AP is engaged early in the process, the developer/owner is decisive about what they want to build, and the entire project team is brought into making the LEED certification work.