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New York City’s newly designed sidewalk sheds are getting roasted online for their oddly sloped roofs — but a design expert says the bigger problem is who’ll pick up the tab.

The Adams administration-era redesign will work, but building owners and contractors aren’t likely to spring for better looking sheds while cheaper green plywood versions remain an option, said David Burney, a Pratt Institute associate professor and former city construction commissioner.

“They’re a huge improvement of the crap that we put up now, but who’s going to pay for it?” Burney said. “Unless they make it mandatory, it’s hard to see who’s going to pay for it.”

The new Baseline Shed and Speed Shed models are on display outside the Department of Buildings headquarters in Lower Manhattan.…