If you're planning to maximize the space, add useful features, and otherwise make changes that are likely to appeal to a majority of homeowners, your renovation may end up being a worthwhile investment in your home's resale value. However, the quality of the work matters, especially if you're planning a major change such as converting the garage into a bedroom. Trading your garage space for a poorly insulated "bedroom" with no windows and the garage door intact won't do much to boost resale value.
I stink at drawing. So pencil and paper isn’t an option for me when working to design my perfect garage (which I’ll unveil at some point in the future). Instead, I’ve been using SketchUp Make —a free 3D modeling software program, once owned by Google, that’s been around for almost 20 years now. And while CAD-style programs can be quite intimidating, SketchUp is super-easy to use and has a huge active community made up of all kinds of people—from architects and interior designers to woodworkers and other creators.
Paint manufacturers have recognized these problems and have come to the rescue with new solutions. But a word of advice: If your garage floor sees heavy water leakage, if it's badly cracked or if it's damp and slimy all summer, don't apply any coating. In those cases, you're better off simply keeping it as clean as you can and then calling it quits.