Ensure that there is electricity available. (Nothing worse than discovering that there isn't anyplace to power up your dust collector.
Peter
And don't forget something like a portable loo (at a minimum) or running water and a real toilet. The usual and customary clauses about payment being due upon receipt of the bill, with a penalty clause (I use an escalating 10% per month clause) as a penalty for late/non-payment. I've had clients that want to use a 10% holdback for items that might fail, until I point out to them that the penalty clause applies to the entire bill, including the unpaid balance. Then again, my best clients all know me well and know that I will make good on any failed items during the warranty period (and sometimes after), even at cost to myself. There's also a clause that says all materials and supplies used to do the job will remain the property of the contractor until payment is received in full. This makes it easier to exercise a mechanic's lien, should it become necessary.
