A punitive approach to what could be unforseen and atypical delays may be a bad idea. I would suggest offering a bonus for the job being completed early rather than a penalty for it being delayed. If material is ordered, we can't make it arrive faster if something delays the shipment. We recently ordered a bathtub requested by a customer. It was promised by our supplier for a Wednesday delivery. Bad weather hit Texas and it just didn't leave the warehouse until the following Monday. It blew up our schedule for the project and it wasn't anyone's fault or mistake. If we have an employee critical to the project get sick or injured, we may not be able to get things done as originally scheduled. Jobs can get off schedule for a lot of reasons outside the contractor's control. Charging them for those things is likely to turn them away.
Going "green" is not only good for the environment; it’s also good for you. Green products have great design, tend to function better, which lowers utility bills, and they’re also chemical-free, making them better for your health. Having an eco-friendly approach to remodeling isn’t just about buying new products, doing something "green" can be as simple as painting a cabinet instead of tossing it in a landfill.
As I contractor if I am installing a customers product or supplying my own, I am charging full overhead and profit above the install cost. I try not to allow customers to supply materials and when they do I tack on my overhead and profit in to the labor. Remodeling is one of the most time consuming services and if your not covering your overhead and profit in the materials and labor you will not last long in this business. At the end of the day after all said and done, making a 15% profit is respectable. Think about it, your the designer, the gofer, the physiatrist, the builder, shopper and the banker until you get paid. Never be intimidated to support your price, deliver a quality product and support it with proper pricing. Never let the customer supply there own materials. Movie theaters don't let you bring in your own pop corn, so why should contractors be any different.
Don’t want your budget to skyrocket? Don't move your plumbing. On the surface, switching your sink and toilet around may look easy enough, but the problem lies underneath and all the costs involved in moving that plumbing. Besides, if you spend less money on moving fixtures, you’ll have more to spend on that new sleek shower system or vanity you’ve been eyeing.