The term "Improvement" means to improve so we tend to think of them as increasing the value of your home. There are some...shall we say, "changes," that can actually lower the value of your home or at least not allow you to recover the cost it would take to make them. Unless you just want to make changes because you want them, some are just not worth the cost.
Not Worth It
1. Swimming Pools. In places like Phoenix these may be a necessity but it you live in Colorado, like I do, pools are only useful for a few months every year. The freezing and thawing we have also makes them a headache to maintain and make sure they do not crack. Usually pools don't add much, if any, value to a home. The insurance and upkeep you pay can far outweigh the benefit. You might also want to reconsider that hot tub as well.
2. More Garage Space. Unless you only have one garage space, or none, adding extra spaces can be expensive but only gives back about 60% of the cost upon resale. Some buyers might also be turned off by more space when they have no use for it.
3. Sunrooms. Like extra garage spaces, the return on sunrooms averages only about 60%. They can look nice but sunrooms are not always a great investment or improvement. A deck is less expensive to add and the return tends to be much better.
I am a real estate broker, attorney and mediator. I am blogging from my own ideas and perspective. Although I am a licensed attorney, these are not intended to be legal advise.