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.

Basement bedrooms can count toward your room count and the square footage of your home on an appraisal if they’re fully legal, which means they have proper ventilation and points of egress, as defined by your local building code. Simply partitioning off a space for a bedroom in an otherwise unfinished basement that isn’t a legal living space won’t affect your appraisal value.

As a seller, it might feel tempting to skip the appraisal, especially in a hot market that sees a lot of all-cash offers. While you can technically forgo it and hope for an all-cash offer, you’ll likely have a very tough time selling without an appraisal. 

In addition to protecting lenders from risk, appraisals also protect buyers’ investments. As such, it isn’t typically recommended for buyers to skip appraisals.

Some appraisers hold a Member of the Appraisal Institute designation. This accolade is the highest credential property appraisers can earn. An MAI appraisal is typically used for commercial properties.

While your lender will likely recommend an appraiser, you can also hire a professional home appraiser on your own. Choose someone who is experienced in your type of residential property, and ensure they hold all of the necessary credentials that your state or region requires.