5 types of excavation projects have been carried out.
     i. Archaeological Impact Assessment Excavations
     ii. Research Excavations
     iii. Excavation Projects which is conducted before conservation of monuments in danger
     iv. Monument Excavations before conservation of monuments as a public exhibitions
     v. Excavations carried out by other organisations
     The Central Cultural Fund, a separate institution also carries out archaeological excavation and conservation work with foreign funds and UNESCO assistances. They conduct excavation work at five sites all of which are world heritage sites, such as Sigiriya, Polonnaruwa, Jetawana and Abhayagiri monastic complexes in Anuradhapura under the authorization of & Department of Archaeology. The Department of Archaeology is the organization responsible for all the archaeological activities i.e. preservation and restoration of cultural assets in Sri Lanka. Any other institution/person that wishes to involve in archaeological activities should get appropriate authority from the Department of Archaeology.