Nepal's prime minister announced on Monday the start of reconstruction of key heritage sites in and around the capital that were damaged by an earthquake that killed nearly 9,000 people and devastated the country one year ago.

Prime Minister Khadga Prasad Oli offered prayers at the 17th century white-walled temple Anantapur, which was damaged in the magnitude 7.8 quake on April 25, 2015, long with more than 600 other historic structures. More than half a million homes were also destroyed, but hardly any have been rebuilt.

Nepal has been criticized for delays in reconstruction — largely due to bureaucratic bungling — of its historic structures and residents' homes despite foreign donors pledging $4.1 billion toward that end. Aid groups have demanded that authorities speed up the process and change some of the laws that have become obstacles.

Oli said Monday that work would begin on rebuilding the temple and three other heritage sites in Kathmandu, including the old palaces and temples at Kathmandu's Durbar Square and key sites in the nearby cities of Patan and Bhaktapur.

A man walks past the collapsed monastery at the Swoyambhunath Stupa in Nepal one year after a deadly quake ravaged the region. Reconstruction of heritage sites in the country is set to begin soon. (Navesh Chitrakar/Reuters)

Anantpur is one of the small Buddhist temples, stupas and monasteries surrounding the 5th-century hilltop shrine of Swayambhunath that lies in ruins. The site is also called the "monkey shrine" for the thousands of monkeys that congregate on the spot at the northwest edge of Kathmandu. It is listed among the UNESCO heritage sites.

The prime minister said the work would progress swiftly, adding it was a huge task that would require time. He also said construction of private houses have been initiated in 10 districts to mark the anniversary.

According to the International Federation of Red Cross and Red Crescent Societies, an estimated four million people are still living in sub-standard temporary shelters in conditions that pose a threat to their health and well-being. Only 661 families have received the first installment of a 200,000-rupee ($13,806 Cdn) government grant, getting 50,000 rupees ($951 Cdn) so far.

Out of the $4.1 billion pledged, Nepal has so far received just $1.28 billion. The delay in getting the money has been blamed on the government taking months to set up the National Reconstruction Authority, which was done only in December.