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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.

Whether a scullery is worth it depends on how much you like to cook and entertain. If you frequently host gatherings—a scullery is likely worth the money. If you’re looking for ROI, it’s not so clear. It may not add significant value to your home, as it doesn’t increase square footage and may repurpose space that a buyer would have preferred to remain as-is (like a laundry room). 

Installing a flagpole can improve your home’s curb appeal, so it will often have a modest positive impact on your property value. You’ll see a much larger bump in property value if you install a custom wooden flagpole than you would if you install a standard aluminum pole. Adding lighting to your flagpole will also have a positive impact on home value, as will trimming trees away from the new lawn addition.

While there's not a lot of definite research, some experts suggest that an in-ground or wall-mounted basketball hoop can add value to your home by increasing curb appeal. In addition, having a basketball hoop is an attractive feature of a house since it promotes physical activity, especially for children.