Although there are many improvements that will make your home more appealing to buyers it is important to understand they won't improve your home's value. Improvements, such as landscaping, bring zero value on an appraisal, since, the next homeowner might not have a green thumb and it could die. Pools are strictly for your families enjoyment. You don't demand a refund after a trip to Disney World don't expect much in terms of added value to your home. In regards to upgraded carpet, no where on an appraisal does it give value for $65 yard versus $15 yard. It has more to do with what is expected in regards to flooring at the home's price point. Installing piers to your home will not improve the value since it is seen as a requirement. Some improvements will be strictly for your enjoyment, some will add intrinsic value, some will be required and some will improve the value of your home. How much added value is to be determined.
Improvements that lose resale value before you are done installing: