Yes, installing a tennis court can be a worthwhile home improvement project that adds value to your property. The potential increase in value can range from $20,000 to $150,000, and in some cases, the return on investment can cover more than 60% of the installation cost. However, the impact on value heavily depends on the size of your property. For homes with multiple acres, a tennis court is often a valuable amenity. In contrast, for homes on smaller lots, installing a court can decrease the property's value because it consumes a significant portion of the usable yard space. It's crucial to consider your property size and the remaining usable yard before proceeding.

A comprehensive smart home system can be really attractive to buyers and increase the value of your property. Components such as a smart security system, smart lawn and garden systems, and smart appliances can all drive up the value of your property.

While a finished basement adds value to your home, it is assigned a different value than space on the main floors. An appraiser will assess the square footage of a finished basement at about 50% to 60% of the value of the square footage for the rest of your home. Appraisal value for a finished basement depends on your location’s real estate market and the specifics of the basement and how it was finished. 

The purpose of the home appraisal determines which party pays for it. You’re generally responsible for the cost if you need to know the current value of your home to refinance your mortgage, though in some instances the lender will pay for it. The buyer pays for the appraisal when they are applying for their mortgage.