Finished below-grade space appraises at a discount to main-floor space — but in Utah's market, finished basements are so standard that unfinished is what stands out. A finish typically returns a healthy share of its cost at resale, and two lines punch above their weight: a conforming bedroom (egress) and a full bathroom, because they change the home's listed bed/bath count — the numbers buyers filter by.
Utah has the largest households in the nation. A finished basement adds bedrooms for kids, a second family room for teenagers, and guest space for visiting family — at $50–65 per square foot, versus several hundred per square foot to build an addition. It is by far the cheapest square footage you will ever add to your home.
This is where Utah is different. A registered basement apartment rents for roughly $1,300–1,400 a month in the Lehi area — $16,000+ a year of income from space you already own. A from-$95,000 conversion pays for itself in roughly 6–7 years, and unlike most home improvements, it keeps paying after that.
Honesty corner: if you're selling within a year, a rushed finish rarely returns full cost — buyers discount work they didn't choose. And a cheap finish (thin carpet, no permits, hollow doors) can subtract value by signaling corner-cutting. If you finish, finish properly and permitted — or leave it clean and unfinished.