He was constructing things, all right — for himself.

The well-paid head of construction for Bloomberg LP built a palatial home in New Jersey with some of the $15 million he and accomplices plundered in a bid-rigging and bribery scheme he masterminded, prosecutors said Tuesday

Anthony Guzzone, 49, pocketed “millions in cash” and a “number of expensive items” in the scam that overcharged ex-Mayor Michael Bloomberg’s financial services company for work on its offices at 120 Park Ave. and 919 Third Ave., Manhattan Assistant District Attorney Christopher Beard said in court.

The freebies included high-end, stainless-steel kitchen appliances, ironwork for security gates, custom barbecues and custom patios.

“He built himself a palace out there in New Jersey — all if it with money stolen from Bloomberg,” Beard said of Guzzone, who has since been fired.

Guzzone’s neighbors in Middletown, N.J., said they endured 18 months of constant construction while he transformed the white, ranch-style house on Farrell Drive into an ostentatious, two-story McMansion with a detached, two-door garage that has an apartment over it.

Matching statues of elephants rearing up on their hind legs flank the steps to the front door, over which a second-story window displays a massive chandelier hanging in the foyer.

The grounds feature an in-ground pool, covered patio, gazebo, wishing well and an array of backyard solar panels — as well as a playhouse that’s a miniature replica of the lavish residence.

“There wasn’t one day they didn’t have a large crew working here, for a year and a half straight,” one neighbor said.

“It was one of the nicest houses on the street, I loved that house. I was mortified when they built this monstrosity.”

Told that the place was built with allegedly ill-gotten gains, the neighbor said, “I’m shocked. I can’t believe it.”

“Well, maybe I can believe it, but I’m shocked,” she added.

Neighbors said Guzzone also owns a Jersey Shore vacation home, which records show is a waterfront duplex in Tuckerton Beach, across the bay from Long Beach Island.

Beard described Guzzone as “the capstone in the pyramid of corruption” that went on for around 10 years and involved 13 co-defendants, including underling Michael Campana and two ex-Turner Construction execs, Ronald Olson and Vito Nigro.

Guzzone was paid around $500,000 a year by Bloomberg, according to a source familiar with the case.

He also served as a silent owner of Litespeed Electric, which grew from a tiny company in 2008 to having $240 million worth of contracts in 2017 — mostly through its monopoly on work for Bloomberg, Beard said.

Guzzone even convinced Litespeed owner Robert Fleming to make his wife, Donna, the company’s CEO so they could score $20 million in contracts set aside for women-owned businesses, prosecutors said.

All of the defendants pleaded not guilty at their arraignments in Manhattan Supreme Court.

Guzzone was released on a $1 million bond arranged by celebrity bail bondsman Ira Judelson.

His defense lawyer, Alex Spiro, called the allegations against Guzzone “one part fairy tale and one part a misguided attempt to turn a professional courtesy into a federal case.”