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4. After regulation 6 of the Principal Regulations insert—
7.—(1) A recommendation report shall include recommendations for the cost-effective improvement of the energy performance of the building, to include—
(a)measures that could be carried out in connection with a major renovation of the building envelope or technical building systems; and
(b)measures for individual building elements that could be carried out independent of a major renovation of the building envelope or technical building systems.
(2) Any cost-effective measure which the energy assessor recommends must be technically feasible for the building to which the recommendation report relates.”.