This is all great information. Thank you.
Basically we just allow for everything and hope we are not pricing too high. It gets expensive fast when you are guessing at fire alarm and feeder routes through a poorly described structure. Experience with a particular structure type would help. I am mostly experienced with steel buildings and could easily blow it on the labour in wood buildings.

Years ago I did a job with a circle of 18 potlights in a room. The framer built it with joists on a 45 degree angle and with lots of them close together along with a steel beam. It was a nightmare to lay out and nobody saw it coming except the framers. It wasn't on the drawing that way.

A standard scope letter is something that I have been looking to create. Here is a link to some basic ideas I will incorporate if anyone is interested.
http://www.vrca.bc.ca/downloads/bpb.pdf
Also, does anyone usually warranty light bulbs?

If anyone can direct me to information where to get more ideas about good things to clarify in my bids I would appreciate it.