A: It can be confusing when one contractor quotes you a certain price while another quotes you a price double that. The bottom line is that a contractor’s experience, the quality of her work, and even the size of her office factor into what she’ll charge. A company with dozens of employees and a big, fancy office will charge more. Some contractors may take shortcuts, so their bids are lower, but you could end up paying more in repairs down the road. Generally, bids aren’t negotiable. If you want to work with a specific contractor but can’t afford to, discuss scaling back the project a little or using less expensive materials so the price fits your budget. Finally, never—and we mean never—pay in full until every last bit of the job, down to that final doorknob, is complete.