On location is the most expensive type of consulting in my service range. (Price agreed with contract )
This is where a Company (Usually a larger one) hires me to work on a short term contract at the location of their offices to help them develop a Website, Database or related solution.

A definite set of 'milestones' is decided upon and also a timeframe for the project, then a rate is decide upon depending on the complexity and nature of the project and market guidelines.It can be daily or an hourly rate.