I've never had to work on-site, but my motto is to always make it worth your while and then some. Within reason of course.  I wouldn't line-item out a commute and software/hardware so much though.. A plumber doesn't charge you "extra" because he brought his tools with him, and a client might be put off by seeing something similar listed as a line item in an agreement.

If I were to work on-site, I would take my hourly rate and their daily hour expectation and multiply and then tack on an extra bit for being out of pocket from my normal home office (lunch outside of my home costs extra, lugging my equipment costs extra, mileage on my car, being able to multitask on other clients' projects, etc.)

If it's only a two or three day gig I would keep it multiplied on my hourly rate, but if it's long-term (weeks or even months) then I would cut a deal with my daily rate being less than my hourly rate for those hours would be. Makes the client feel they are getting an advantage.

But apparently I charge an arm and a leg for my services compared to other people, so my method might be skewed. Take that as you will.

If you want, email me off list and we can talk real numbers instead of vague stuff.

///Greg Balint
//Art Director / Motion Graphics Designer
/321.514.4839
delRAZOR.com/