Jeff Van Gundy thinks the Nets should be quite happy with the progress through their first season in Brooklyn.

In fact, the former Knicks and Rockets coach said he is surprised they have done as well as they have this year.

“I think they’ve overachieved, absolutely,” Van Gundy told The Post Wednesday before calling the Nets’ 113-96 victory over the Mavericks on ESPN.

That, of course, hasn’t been the view of things in Brooklyn, where the Nets came into the season hoping to become contenders after re-signing Deron Williams, committing more than $330 million in present and future dollars to dramatically overhaul the roster and try to fulfill billionaire owner Mikhail Prokhorov’s championships aspirations.

But, in Van Gundy’s eyes, the expectations the combination of the spending — including the addition of Joe Johnson to go along with Williams and Brook Lopez — the aspirations of ownership and the team’s move to Brooklyn created set the bar for a successful season to an unrealistic level.

“When you have, to me, high expectations, but not necessarily the roster to fulfill them, you can be enveloped by disappointment,” Van Gundy said. “I think they should be ecstatic [with] where they came from the last couple years to where they are now, and [now] just [need to] keep trying to add and build.”

Those high expectations already claimed one victim this season, as the Nets chose to part ways with Avery Johnson after a 3-10 swoon in December — just a few weeks after being named the Eastern Conference Coach of the Month — wound up costing him his job shortly before the start of the new year.

But Van Gundy, who maintained his previous stance on any possible return to coaching himself, saying he wouldn’t comment on any job that was filled, praised the jobs Johnson and interim coach P.J. Carlesimo have done this season.

“I think [the Nets] have accomplished great things,” Van Gundy said. “I think they have maximized what they have. And the only down period, to me, was when Brook Lopez, who I think is a very good player, was out, and the combination of Williams not playing well at that point and Lopez being out led them to a difficult stretch.