Code on Iron Railings?

Hi everyone. I am planning to install new railings going up my stoop steps. My iron guy tells me the posts — the vertical “spindles” perpendicular to the handrail — need to be 4 inches apart. But others tell me that that code doesn’t apply to single family homes. It’s a Landmarked house but the Landmarks Preservation Commission doesn’t know the answer either. I’ve tried to download the DOB code and I am baffled. Can anyone please offer any advice?

By jlo |