A self-supply arises if a trader carries out without using outside contractors:

a(a) the construction of a building or civil engineering work, (b) the extension or other alteration of, or the construction of an annexe to, any building such that the floor area is increased by 10% or more or (c) any demolition work in connection with work described at (a) or (b) which is carried out contemporaneously with, or preparatory to, such work;

bthe work would have been positive-rated if supplied to the trader by a third party; and

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