It depends on which part of the country you are remodeling in, but on average for a midrange remodel here are the percentages of the costs that you will recoupe:

Basement 70%

Bathroom 64.1%

Home Office 68.7%

Major Kitchen Remodel 68.7%

Minor Kitchen 72.8%

You can do some of the work yourself to save money such as removing cabinets or painting.  Many homeowners over improve their kitchen which is only cost effective if they will be staying in the house a long time.

In short, if you will be in your home long enough to enjoy the remodel then enjoy!  However, do not over improve your home out of the neighborhood because chances are you will not recoup all of your costs.  In addition, if you can, then do some of the work yourself to save some money upfront.