Alan I assume the GC is EBCO/EBY Construction Group, am I correct?
Do you have insight into the project PM and superintendent? How did you feel when you did your walk through? What was the condition of the project? How long from your walk through until you would be scheduled for your final clean.
During your walk through did you have a chance to pull aside a sheet rocker or painter and casually ask them questions? A lot of times guys on site will tell how the construction phase is going. It will give you an insight on how the project will close.
A lot of time spent will be on the outside windows unless they are double hung and you can access them from inside. Also the walk-in tub/shower condition would be a big concern of mine, were they covered, what shape are the in. How many coats on the VCT, 2 or 3? How many sf. What is the cost of your finish for this project?
Are they going to release the project to you a floor or wing at a time starting on the top floor?
.20 per sf. is a good fair price, any idea what their budget is. Did you ask?
Iím not that familiar with your market (Iím in South Carolina) or your gross labor burden or the history of what the PM has budgeted for this type of project, so it would be hard for me to suggest a price. But if it were me and I though I could make a good profit at just under 15K for everything, I would bid it that way.
Again a lot would depend on how much work is involved in the touch-up and the time in between your final and touch-up. And how much is invested in rental lifts, if any and wax cost.
I hope this helps, please let us know how it went.