This class includes demolition or wrecking of buildings and other structures, clearing of building sites and sale of materials from demolished structures. Blasting, test drilling, landfill, levelling, earthmoving, excavating, land drainage and other land preparation.

Also included are tunnelling, overburden removal and other development and preparation of mineral properties and sites, except oil and gas sites.

Exclusion: Preparation of oil and gas fields is classified in class 1110 (Extraction of crude petroleum and natural gas), when performed on own account, and in class 1120 (Service activities incidental to oil and gas extraction excluding surveying), when performed on a fee or contract basis, respectively.