Is a sidewalk shed required for LL-11 inspections?

No …. according to the DOB, unless probes or in depth examination is required in order to understand the underlying cause of the defect:

When the inspection involves probing, removal of wall or appurtenance material, safety netting on all open sides of the scaffold drop or other observation platform shall be provided. In addition, adequate protection at the sidewalk or public space below shall be provided. This may be in the form of roping off part of the sidewalk, installation of a partial sidewalk shed or any other method determined by the professional to be adequate for the safety of the public and property. Necessary permits must be obtained from appropriate authorities.

A person with a valid New York City Rigger’s License must supervise the operation of the scaffolding, following all safety procedures as required.