I own a residential construction company and am currently building a schedule for a project to start in a few weeks. My scheduling is typically pretty good; however, ever since COVID hit, it's been a wreck. Ex. I currently have a project that is 2 months behind (9 month build schedule). Due to this, I'm trying to be more realistic about my subs and vendors and plan in A LOT of float time.

What methods do people use to build this much extra time into your Gantt chart? Ex. Do you take a 10-day electrical job and just plugin 20 days? Do you build in extra tasks called "delays" everywhere?

Thanks for your thoughts.