How do I adjust my retainage percentage? Ginny Johnston Modified on: Mon, Jul 19, 2021 at 6:03 PM Retainage has to be unlocked before any changes can be made to the percentage. The general contractor must unlock retainage. How do I unlock retainage for a subcontractor SOV? Once retainage has been unlocked, you can change the Work and Material Retainage percentages or adjust the retention Type.