There are a remarkable number of garage options that vary widely in design and price. If your doors could use a functional and aesthetic upgrade, consider budgeting for replacements that include enough extras that they help boost your curb appeal. These pretty doors include old-style pulls as well as small windowpanes, all painted in a color to blend with the rest of the home.
Start by insulating the walls. Buy unfaced R-13 batts for 2×4 walls and unfaced R-19 batts for 2×6 walls. Match the width of the batt (15-1/4 in. or 23-1/4 in.) to the stud space. Cut batts carefully for a tight fit. Next, staple 4-mil poly to the walls and ceiling. Embed the poly sheeting in caulk around the perimeter of each piece to create an airtight seal. Seal the seams between sheets and seal the poly to electrical boxes with caulk or special sheathing tape (it’s typically red and looks like packing tape).
Conversion: Depending on your circumstances you may want to look into how to convert your garage into a functional room. This is not always the best option, and largely depends on what other houses comparable to yours look like. If other homes in your area have more square feet available, or more bedrooms it may make sense to convert your garage into a bedroom.
Have a ballpark figure in mind. Determine what you can comfortably afford to spend on your garage remodeling or building project. Where does it fall in your list of home improvement priorities? Will you be spending 100% of your remodeling and construction budget on it? Having a clear idea of your price ceiling will help you avoid making choices that are too expensive or elaborate and having to scale back in the process.
Every project comes down to cost, so it only makes sense to start there. According to our garage remodeling cost estimator, the average garage remodel runs $8,582. Keep in mind, this takes the full garage into consideration. That includes the garage door, flooring, windows and plenty of other renovations. For those remodeling one aspect of their garage, of course, expect the final price to be much less. In fact, we have even seen garage remodels cost as low as $900.
Waterproof paint (for concrete walls) • Paint (dry wall) • Behr concrete cleaner (2 Gal) • Behr Concrete Etcher (2 Gal) • Behr Concrete Bonding Primer (1 Gal) • Behr 1-Part Epoxy Paint (2 Gal.) • MiscPainting Supplies • Stainless steel light switch/receptical covers • Lumber for cabinet over circuit breakers • Gladiator Garage Works workbench-Wall cabinets-tall cabinet • Hooks for bicycles/tools • Tapcon masonary drill bits • PVC (to run wires for garage door openers

A full-scale apartment or guest house will take you to the top of your budget and beyond at an average between $15,000 to $30,000. You'll need to make all the upgrades mentioned for a family room, along with a separate bath and kitchen. You'll need to run a gas line or a 220 outlet for the stove. You'll also want a private entrance for your apartment, which usually entails adding a fire door.
Leaky doors and windows let in uncomfortable drafts and increase heating and cooling costs. Check your garage service door to be sure it has good weather stripping and a threshold that seals tightly to the bottom of the door. In most cases, if your service door is missing a threshold and weather stripping, it’s more efficient to replace the door with a new, weather-tight version. You can buy an inexpensive prehung metal exterior door at home centers and lumberyards. 
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