When it comes to home improvements, knowing what you want is the easy part. The tougher question is figuring out how much you can afford. Follow this four-step plan to arrive at the answer.

1.  Ballpark the costs. First, get a handle on how much your remodeling dreams will cost. In general, major upgrades, such as a bathroom remodel or a family-room addition, run $100 to $200 per square foot.

“Remodeling” magazine’s 2015 “Cost vs. Value Report” gives national averages for 36 common projects. You’ll find many of those project costs and other good info in our Cost vs. Value section.