Next, here, our "Real money" team is back because it turns out Americans made more than $3.5 billion last year using some of the things in their everyday lives. ABC's Rebecca Jarvis is here to show us... See More
Next, here, our "Real money" team is back because it turns out Americans made more than $3.5 billion last year using some of the things in their everyday lives. ABC's Rebecca Jarvis is here to show us how. Rebecca? Reporter: Diane, you may have heard of renting out your home. Now, people are making money on all the things around their home. Going unused so much of the time. It's called the sharing economy. And tonight, we're showing you the "Real money" that you can make just by renting out what you already have. Hi. Reporter: Meet Kelsey Risher, a dug-lover in Chicago. And ginger, a chihuahua-terrier mix who's helping Kelsey pay her rent. How much do you think you've made? A lot. Some months it's well over my rent. Reporter: How? Kelsey, whose home is already set up for her own puppies rents it out like a hotel to other fury friends through a website called dogvacay.com. Kelsey signed up online. And ginger's owner picked Kelsey to dogsit. Across town -- Tim white is making money renting out his old bike for 30 bucks a weekend, through a new site called spinlister.com. This past summer I paid for the bike itself. Reporter: Not bad. And how about your car, which sits unused for 92% of the day. This family rents out theirs through relayrides.com. You set the price, pickup time and location and renters pick up directly from you. Your car is even covered with relayride's $1 million insurance policy. They say the average user makes $250. And their top earners take about $1,000 a month. We're hoping to save a little bit for a college fund. We're sitting in his college fund right now. That's great. Or instead of the car, rent out the place where you park it. Kevin does that with his driveway, not far from the Chicago bears stadium. He rents it out to football fans, using parkatmyhouse.com. He made $400 last season. And you can even make money renting your backyard to campers. Through real estate rental site airbnb. If you're not making s'mores, you can make money. Remember the family renting out their car on weekends, that's $3,000 in extra money every year. If they keep it up, they will socked away $50,000 by the time their son heads to college. But Diane, different cities have different rules. You have to check there first. That's really smart. Thank you so much, Rebecca. And "Real money" will be back tomorrow night. We're going to show you how to make money off your family recipes.
This transcript has been automatically generated and may not be 100% accurate.