Chris Gutek, who invests in high-interest rate loans for new and renovated properties, at the site of a development in Grand Rapids Township, Mich., Oct. 18, 2017.

House flipping, which declined after the financial crisis in 2008, is on the rise again, thanks to low interest rates and rising home prices. And with the renewed interest comes investors looking for a high return.

But the real estate strategy — in which a home is bought, renovated and resold quickly — requires fast access to money, and developers are willing to pay higher interest rates for it. The loans are backed by the property and are short, typically running for a year or less. And the funds that finance them offer reliable returns of about 8 percent, for those who can meet minimum investments, generally $100,000.