Your job changed and you're doing more work than you originally were hired to do. You've saved the construction employer money by negotiation contracts with vendors or streamlined processes. Your work is worth more in the construction industry than what you're being paid. Inflation reduced the value of your construction salary. It may be one, or a combination, of these reasons that you deserve a raise. Preparing documentation does a couple of things. First off, it shows your construction manager exactly what you've done that makes you deserve a raise. It shows the responsibilities you had when you took the job, how the position changed, and how you've met and exceeded goals of the various projects you've worked on. Secondly, with this documentation, your construction manager has the ammunition needed to verify the merits of your raise.