JPMorgan Chase boss Jamie Dimon needs some serious home improvement.

Dimon’s bank, one of the nation’s biggest mortgage lenders, is also the worst at helping homeowners through a government program aimed at preventing foreclosures, according to a report released yesterday by the Treasury Department.

JPMorgan was the only bank singled out as needing “substantial improvement” for its poor performance under the Home Affordable Modification Program.

“We are disappointed with our rating, and will continue to work hard to improve our processes and controls,” JPMorgan said.

Treasury’s poor review came as the outspoken bank boss continued to rail against Wall Street regulation and the vilification of the rich, highlighted by the Occupy Wall Street movement.

“Acting like everyone who’s been successful is bad and that everyone who is rich is bad — I just don’t get it,” he said in a speech at a Goldman Sachs conference.