I've been getting calls about adding onto existing landscapes. The problem is that they are small additions (total cost of plants is 2-500.00) and have a problem convincing customers to spend what I charge for labor plus the cost of materials. My question is when bidding these types do you follow the "materials X 2.5 or 3" rule to cover labor and guarantee? Or do you figure a little less. I did the latter for one and it seems fair. My overhead is met, I make my hourly wage and so on. I'll see how it goes.