The basement kitchenette
The most-requested upgrade in Utah basements — from a simple beverage-center-and-microwave nook (~$8–12k) to a full apartment kitchen with range and ventilation ($18–40k). If a rental is ever in your future, plumb for the full kitchen now even if you install the small version first.
The wet bar
Quartz waterfall counter, beverage fridge, floating oak shelves, amber pendants. The wet bar is what turns a TV room into the place everyone ends up. Typically $8,000–15,000 as part of a finish.
The media wall + family room
A built-in media wall with soft LED lighting anchors the room and swallows every cable. Pair with a big sectional and the deepest carpet pad money buys. The core of every Essential-tier finish.
The guest suite
Bedroom with a big bright egress window + full bath next door = a suite grandparents actually enjoy. A code egress window transforms basement light — it's a window, not a hatch. Adds ~$18–30k over an open finish.