The first step is often fixing a cracked floor or leveling it, and sometimes even staining it to make it look more attractive; the repairs cost $500-$12,500, and stains range from $2 to $10 per square foot. Drywall is typically put up, which costs from $1 to $2 per square foot. Adding boards for a storage space above the garage typically costs about $2 per square foot.
Garages have minimal insulation, so if you’re renovating your garage to turn it into an office or family room, you’ll certainly need to add insulation and HVAC. Your insulation pro will start with the ceilings and floors. Beyond that, they may or may not choose to add insulated garage doors (if doors are being kept). All in all, adding new HVAC and insulation can add $2,000 to $3,000 to your garage remodel cost.
If the concrete slab in the garage is the problem, there are more cost-effective solutions than a concrete mason. Most cracking, flaking, stains, pitting or wear can be easily fixed by calling a concrete specialist to apply either an inexpensive epoxy or polyurethane-based coating. These seals are very durable and can make your garage floor look brand new.