The conforming loan limit will increase again in 2018, prompting some pushback from supporters of the non-agency market. The conforming loan limit for one-unit properties in 2018 will be $453,100, up 6.8 percent from the current limit. For high-cost areas, the loan limit will be as high as $679,650 in 2018, up from $636,150 this year. The limits apply to acquisitions of mortgages by Fannie Mae and Freddie Mac, and annual adjustments are based on a house-price index ...