Kami Rita Sherpa, 52, scaled the 8,848.86-metre (29,031.69-foot) mountain on Saturday along the traditional southeast ridge route leading 11 other Sherpa climbers. Dawa Sherpa, manager of Seven Summit Treks Pvt Ltd said the hroup summited the 8,848.86-metre peak at 6.55 pm (local time).
"Kami Rita has broken his own record and established a new world record in climbing," said Taranath Adhikari, director general of the Department of Tourism in capital Kathmandu.
The Sherpas made the expedition to fix ropes along the trekking route, to help climbers ahead of the peak climbing season starting May.
The group climbed through the traditional southeast ridge route which was pioneered by New Zealand's Sir Edmund Hillary and Nepali Sherpa Tenzing Norgay in 1953.
This year the Department of Tourism, Nepal has issued permits to 316 individuals to climb the peak.
Rita scaled Mt Everest for the first time on May 13, 1994. Besides Mt Everest, Rita has also scaled Mt Godwin-Austen (K2), Mt Lhotse, Mt Manaslu and Mt Cho Oyu.
He also holds the record for most climbs over 8000 metres.
Till date, Everest has been climbed 10,657 times, many have climbed the peak multiple times. Over 300 people have died trying to scale the peak.