11. Power of entry on building or land.

(a) making any inquiry, inspection, measurement or survey, or taking levels of such site or building;
(b) examining works under construction or ascertaining the course of sewers or drains:
(c) ascertaining whether any site is being or has been developed, or any building is being or has been erected, in contravention of any direction issued under section 6 or without the permission referred to in section 7 or in contravention of any condition subject to which such permission has been granted; or
(d) ascertaining whether any land is being or has been used for the purposes of a charcoal-kiln, pottery-kiln or lime-kiln without a licence or in contravention of any condition subject to which such licence has been granted: