Immigrants seeking employment-based green cards from within the U.S. will soon have to appear for an in-person interview.

Immigration attorneys are concerned the new requirement will result in significant delays with little benefit. U.S. Citizenship and Immigration Services will begin to phase in the interview requirement Oct. 1.

“This new policy represents a sea change in the employment-based immigration space,” Chad Blocker of Fragomen, Del Rey, Bernsen & Loewy in Los Angeles told Bloomberg BNA Sept. 27. “Interviews technically have always been required,” but the USCIS historically has waived that requirement for most employment-based green card applicants, he said.

“I’m...