119Retaining walls

119 Retaining walls (1) The municipal building surveyor may require the owner of an allotment to provide retaining walls or other means of maintaining the stability of the soil if the municipal building surveyor considers that the stability of the ground on the allotment or any adjoining property has been or may be adversely affected by any excavation or filling of soil on the allotment. (2) An owner of an allotment must comply with a requirement in relation to the allotment under subregulation (1). (3) Subregulation (1) does not apply if the owner of the allotment is required to provide protection work in relation to an adjoining property under regulation 111. Part 8—Building work Division 1—Methods of assessment of compliance 120 Testing of materials (1) The relevant building surveyor may require that the owner or builder carrying out building work for which a building permit has been issued arrange for the testing of any material used in the building work. (2) The relevant building surveyor may, as a result of tests carried out under subregulation (1), prohibit the use of any material that— (a) does not meet the requirements of these Regulations; or (b) is found to be unsuitable or unfit for the purposes for which it is intended. (3) Tests required under subregulation (1) must be carried out by an Accredited Testing Laboratory or a Registered Testing Authority or an approved person or organisation.