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The general approach I have followed is that the ASHRAE schedules are a great starting point, but probably don't reflect your building/project and therefore should be fit to the project. There can be good to get an owner's rep / architect / team to think about when and how the building will be used. I've done this by providing a 'summary of schedules' to have them mark up and return. Infinitely more successful than the open ended 'so, what are your building schedules?'

We also do quite a few project which there are no ASHRAE typical schedules and have to craft our own (ex: stadiums / sports facilities). As long as Proposed = Baseline and the schedules are reflective/realistic that's probably fine.