Always ask to be billed for actual man-hours if the project warrants it. The other service people you've hired to perform construction, painting, carpeting, phone and computer installation can cause costs to escalate. If your area is not free and clear for the furniture delivery and installation people to carry out their duties they will bill you for down time. When dealers make deliveries they want to place the furniture in the exact space in which it will be installed. Make sure to have electricians at the ready when using electrified panels.
Some systems require that the electrical connections be made as the panels are being constructed.
Delays mean extra charges. Often times a site is not ready for furniture, but circumstances are such that you are forced to receive delivery. If your space still needs to be painted, or light fixtures installed etc., your furniture is likely to be damaged. Repair costs can be exorbitant, so be careful. It is almost impossible to prove how and by whom the furniture was damaged, and to recover the cost of repair.