Fannie Mae and Freddie Mac will shift their focus toward making more credit available to homeowners instead of their existing policy of pulling back from the mortgage market, the new head of the regulator overseeing the companies said Tuesday in his first public remarks.

The speech by Mel Watt, the former North Carolina congressman who took over as the director of the Federal Housing Finance Agency in January, offered clear signs of a shift in direction at the agency, which controls Fannie and Freddie while they operate under a legal process known as conservatorship.

Mr. Watt largely steered clear of hot-button policy debates, resisting for now demands from liberal supporters to provide more generous foreclosure relief and saying little about what steps the agency might take if legislation to replace or overhaul the companies can't pass Congress in the next few years.

But he signaled important changes in reports that outline the performance goals for the companies' management teams. Citing concerns about the health of the housing market, Mr. Watt said he wouldn't direct the companies to reduce the maximum loan limits, something his predecessor, Edward DeMarco, had actively contemplated late last year.

He also said Fannie and Freddie would participate in a new pilot program focused on neighborhood stabilization in Detroit that could be expanded to other parts of the country later. "We believe this will be a win-win for hardest hit communities and for our conservatorship objectives," he said in a speech at the Brookings Institution.

In recent years, the companies have been given three broad mandates: to build a new infrastructure for the mortgage market, to maintain foreclosure prevention and credit availability, and to contract their presence in the market. Last year, the FHFA's acting director, Mr. DeMarco, placed the highest priority on the latter step.

Mr. Watt said that for the coming year, the firms' most important mandate would be to promote credit access.

"Housing finance market conditions are far from what could reasonably be considered satisfactory or normal," the FHFA said in a report released Tuesday outlining its priorities. The report said the agency expects Fannie and Freddie to assess "whether there are additional opportunities to reach underserved creditworthy borrowers."

Some policy makers have faulted ambiguous provisions around when banks must repurchase defaulted mortgages for creating credit standards that are unnecessarily restrictive. Fannie and Freddie, at the FHFA's direction, on Monday unveiled steps to give lenders a greater shield against so-called "put-backs."

Rather than contract their roles in the market, Mr. Watt will give the companies a different mandate to reduce risks shouldered by taxpayers. The changes suggest Mr. Watt may be more focused on preserving Fannie and Freddie as the backbone of the nation's mortgage market until Congress tells him to do otherwise.

Mr. Watt said the companies would refocus more narrowly an initiative started by Mr. DeMarco to create a common platform for mortgage securitization. Last year, the FHFA established a new company, jointly owned by Fannie and Freddie, to set up that platform. "Since any stumbles along the way could have ripple effects...there's a lot at stake in getting this right," Mr. Watt said on Tuesday.

Mr. Watt said he would use the initiative to move Fannie and Freddie toward sharing a single security. Currently, the companies issue separate securities, and Freddie has been forced to provide concessions to lenders that cost hundreds of millions of dollars every year because its security is less liquid than Fannie's.

Fannie and Freddie don't make loans, but they buy them from lenders and package them into securities, providing guarantees to investors. They play a significant role in financing around two-thirds of mortgage originations, and they guarantee around half of all mortgages outstanding in the U.S.

The companies were taken over by the U.S. in 2008 to prevent a deeper housing depression, and the FHFA was tasked with managing the companies. The agency has broad powers to refashion the firms, including ending the government-run conservatorship, though only Treasury can end the firms' funding backstops.

Mr. Watt's first steps are being heavily scrutinized because bipartisan legislation to overhaul the firms appears unlikely to advance in Congress this year. Meanwhile, the companies have now returned more money to the Treasury--the amount will rise to around $213 billion next month--than the nearly $188 billion they were forced to seek after their collapse. Hedge funds and other investors are suing the government to challenge bailout terms that allow the government, rather than the companies, to retain profits.

On Thursday, lawmakers on the Senate Banking Committee are scheduled to vote on a bipartisan bill to replace Fannie and Freddie with a new infrastructure by which the government would reinsure certain loans in which private investors had agreed to take initial losses. The measure is supported by the White House.

While lawmakers are expected to approve the measure on a narrow majority, the bill doesn't appear to have enough support to compel Sen. Majority Leader Harry Reid (D., Nev.) to bring the bill up for a floor vote.

Write to Nick Timiraos at nick.timiraos@wsj.com

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