Add between $75 and $500 to your budget for the cost of outlet installation. Most garages have electricity of some sort, even if it's just a bare bulb in the ceiling and a few outlets spaced around the walls. If you're trying to convert your garage into living space, you'll need a nearby licensed electrician to add more wiring and outlets for additional electrical devices.

The first step in planning a garage conversion is deciding upon the room's new intended purpose. Do you need a place for teens to hang out at home with friends? Are you dreaming of a large, luxury man cave? Maybe you'd just enjoy an upgraded space to park your cars in winter - one that's fully insulated and climate controlled? Before you decide, keep a few factors in mind:
The cost of installing five windows falls somewhere around $5,000, or about $1,000 per window. If your garage doesn't have any windows, plan to add at least one. This is especially important if you want to list it as a bedroom or rent it out. You'll need an egress window big enough for a person to escape through in case of a fire. Egress windows average about $3,500.
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.

Heating & AC ($1000-$5000): Adding central heat and air into your garage can either be simple or difficult. If you have a robust heating and air conditioning system in place it is as simple as expanding your existing ducting. If the additional square footage is more than your system can handle you will need to add in a new unit. Luckily, a small garage usually is able to be fit into your existing system.

When it comes to garage insulation, homeowners have two options. Foil insulation (pictured above), tends to look like foil, but the inside is usually laced with heavy-duty polyethylene. The polyethylene is usually used in rigid sheets that are placed inside the cavities of your garage door. Once placed onto the garage, the polyethylene expands to fit into place.


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.
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.
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.
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