Question: does the look of the inside of my garage matter when selling my home?
Answer: Absolutely it does. When Buyers are looking at your house as their potential next home, every part of it needs to shine. Yes, even the garage. Just because it isn't part of the living space, it is still an extension of the home. It can be a statement of how the home is maintained. Even if the home is beautiful a messy garage will be what people remember.
While the garage doesn't have the finery of the inside of the home, it should be clean and organized. A place for everything and everything is it's place. Maximize the storage space with cabinets. Hang tools on the walls and sweep the floor.
Getting things up off the floor and put neatly away will actually make the garage look bigger. Be sure all the lights work and that the garage door opener is working smoothly. If the main garage door isn't closing properly, or is cracked or bent, it reflects on the maintenance of the entire home, not just the garage. Consider covering studs with drywall, paint the floor, wash the windows, etc. The main objective is to be sure that the garage is clean, tidy and that it doesn’t detract from your home’s other positive features.
The last thing you want is a Buyer that loves the home but walks into a garage full of stuff and poorly maintained. That can cost you dollars and even a sale!