The Authority may authorise any person to enter into or upon any site or building with or without assistants or workmen for the purpose of :––
(a) making any enquiry, inspection, measurement or survey or taking levels or such site of building or both ;
(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 without the permission referred to in section 4 or in contravention of any condition subject to which such permission has been granted :
Provided that :––
(i) no entry shall be made except between the hours of sun-rise and sun-set and without giving not less than twenty-four hours written notice to the occupier, or if there is no occupier to the owner of the building or land ;
(ii) sufficient opportunity shall in every instance be given to enable women, if any, to withdraw from such land or building.