Having spent many years on construction sites myself, I appreciated it when the clients provided drinks and occasionally brought a snack. Tips are nice, but it was always even better when the client came by with homemade cake and a pot of coffee. It simply motivates a tradesperson when they see that the clients appreciate the work being done on the construction site. Back then, we also preferred being provided for during work rather than having topping-out ceremonies, because spending the evening with family was already a priority.