Please advise on pricing ?

[dzdale]

I have been asked to tender for a job (Commercial) for quite a large company in the UK. I have been asked to photograph the progress of a new warehouse through its building stage every 3 weeks for a period of 18 months. how would you charge in this scenario ?

[LewisImaging]

how many hours of work for each session? do they want proofs or cd or what? a little more information would help.