You can’t sue me for being a bad architect — because I’m not an architect at all.

That’s the nervy claim a Manhattan man made when he was accused of ripping off a billionaire motel mogul and his yoga-instructor wife for $145,000 in bogus costs tied to the botched renovation of their Bahamian vacation home, a new Manhattan lawsuit charges.

After admitting he wasn’t a licensed architect, Yianni Skordas actually warned the couple that they couldn’t sue him for professional malpractice, saying he “is not a professional,” the suit claims.

On the recommendation of a friend, Cendant Corp. founder Henry Silverman and his wife, Karen, hired Skordas in 2014 to oversee an $8 million addition to their Ocean Club estate on Paradise Island in Nassau, Bahamas.

“Throughout their relationship, Mr. Skordas deceived the Silvermans into thinking that he was a highly qualified, professional architect,” the suit states.

Instead of the promised expert job, Skordas built a “jail-like fence around the property,” installed a “door to nowhere” and pocketed payments meant for contractors, the suit alleges.

Skordas, an East 66th Street resident, even tried to get the suit tossed by ­arguing that “the law is well-settled that only professionals can be held liable for ‘malpractice.’ ”