Now, a bill has been reintroduced in the City Council that would, for the first time, mandate the removal of a giant chunk of the scaffolds that front 7,750 buildings and envelop more than 275 miles of city sidewalk.

Sponsored by Council Member Ben Kallos, whose district on the Upper East Side is pockmarked by hundreds of sheds, the legislation would require a structure to be dismantled within six months of being erected — or in seven days if no work has been performed in that time.

Failure to complete necessary building repairs and demolish the nuisance structure after 180 days would call for the city to intervene, finish the job, take down the shed and bill the property owner for all costs, according to the language of the bill.

Built with planks, poles and a steel roof, the pop-up eyesores are designed to keep pedestrians safe as they pass beneath construction sites. But the structures typically stay put when a project is delayed for years, runs out of financing or encounters other stumbling blocks.

“Sidewalk sheds are like the once-welcomed house guest who never leaves,” Kallos said.