Secret Service spokeswoman Catherine Milhoan said authorities also considered the implications of imposing further restrictions on public access to the immediate area of the White House.
The stretch of pavement along the south fence has been closed each night - between 11pm and 6am - since 2015.
The area that's now off-limits includes the sidewalks, roadways, and parkland areas between the south fence line of the White House and E Street NW from West Executive Avenue to East Executive Avenue.
The Secret Service in recent years has gone through a series of embarrassing security lapses, including a 2014 incident in which a man jumped the White House fence with a small pocket knife and got inside the front door before being apprehended.
The perimeter expansion comes follows a March incident in which a man carrying a backpack scaled the White House fence and remained on the property undetected for 17 minutes.
The blocking of the sidewalk will not obstruct the public's ability to view the White House and no additional "physical" barriers will be installed, according to the Reuters report.
Passers-by will still be able to see and take photographs of the White House and its grounds.
Two Secret Service agents were later fired over the matter, the agency said last week.
President Donald Trump was there at the time, but the intruder did not make it into the White House building.
The Secret Service noted that similar limitations had already been in place between 11 p.m. and 6 a.m. since 2015. The agency added more security measures to the front of the White House after a number of intrusions in the past few years.
FILE - In this October 3, 2014 file photo, two women lean against a temporary barrier along Pennsylvania Avenue in front of the White House in Washington.
The goal is to create a buffer zone like the one at Pennsylvania Avenue.
A member of the Secret Service, with his dog, stands guard near the fence on the North Lawn of the White House on Monday.
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