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.
You may have to drill holes through studs or through the top plate of walls to reroute wires. If so, be sure to center the holes on the stud. If the plastic-sheathed cables are too short to reach the next box when you reroute them, you can add a junction box and splice on a length of cable. The new box must be accessible either in the attic space or through a blank cover on the wall or ceiling.
It’s often not enough to just make sure your garage doesn’t look bad. Sometimes you need to use this space to add some style or emphasis to your home to help it stand out from the crowd. Your first step is to look around your neighborhood at comparable properties. Look and see what they have done with theirs. The goal is to outdo your neighbors, but only just so much. You don’t want to price yourself over the market. Some upgrade options to consider are;
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.