Remodeling is a great way to stay in the house you have. Plus, making changes can improve the way you live. But everyone has heard the horror stories of going 50 percent or more over the remodeling budget. Truth be told, even contractors will admit that it’s hard to provide an exact price on the work, because there are often unforeseen circumstances that could cause the price to rise. I always recommend factoring in about 20 percent over what you think you should budget. But knowing what you want from the very beginning — and sticking to those goals — can greatly help your project stay on track. Even if it seems like it’s going off the rails.