Persons engaged in the erection, construction, reconstruction, wrecking or repairing of any building, or the construction or repair of a sidewalk along any street, may occupy the public street space with such building material and equipment as long as is necessary, if such person shall make written application to do so; provided, no permit for the occupancy of the sidewalk space, or more than one-third of the roadway of the public space adjacent to the real estate on which said building is to be constructed, erected, reconstructed, wrecked or repaired shall be granted; and, provided further, a suitable passageway for pedestrians shall be maintained within the public space included in the permit, which shall be protected and lighted in the manner required by the City Council.