Basements, attics, lofts, utility rooms and other bonus spaces are often ideal sites for upping the ante on your home's value, appeal and functionality. Often under or poorly utilized, these spots can be the perfect setting to flex your design creativity. Get your inspiration flowing with this sampling of upgraded basements and bonus rooms from some of HGTV's most popular shows and designers — including some pretty impressive before-and-afters.

Property Brothers Drew and Jonathan Scott upgraded this bare basement space for clients as part of their family's forever-home renovation. Key among the clients' wishes was a studio space for their two creative daughters.
From Property Brothers, Season 9, Episode 2

A remodeled basement done by the Property Brothers gives a family with two daughters more room to showcase their creativity. A custom mural makes this space unique, while durable, sealed-concrete floors add worry-free function and versatility.
From Property Brothers, Season 9, Episode 2

The space is outfitted with a striking and well-curated mix of boho, modern and vintage pieces including retro-style purple and orange chairs, a green velvet-upholstered sofa a patchwork rug and an antique drafting table and easel.
From Property Brothers, Season 9, Episode 2