According to official figures, the quake, which caused nearly 9,000 dead, severely damaged 137 historic monuments and buildings, while other 444 were partially hit.
The general director of the Department, Bhesh Narayan Dahal, explained that his agency has the support of national and foreign experts, but needs funds.
However, he clarified that several international institutions like Unesco and Nepalese businessmen promised money for that task.
The earthquake, of 7.8 magnitude on the Richter scale damaged monuments in this city, among them the Hanuman Dhoka Palace, and temples of centuries old.
It also pull down the tower at the Durbar Square, one of the most visited places in the country.
Recently, a parliamentary committee called on the government to start reconstruction only after conducting geological surveys in the areas provided.