Standard of Workmanship
Most standard-form contracts provide that a contractor's
works are to be carried out in a "proper and workmanlike
manner". Different words may be used but the general concept
is the same.
Even if the contract does not describe the standard of
workmanship, the common law (that is, the law that develops over
time through precedents set by the courts) says that this standard
of workmanship is implied into every works contract.
Because it is the contract that sets the standard, the law
treats work which falls below this standard as a breach of
contract.
Your rights if a Subcontractor does defective
work
Under the common law, this breach of contract will entitle the
contractor's principal or employer to be compensated for the
loss and damage suffered as a result of poor workmanship.