The making of final payment for a contract, the written acceptance by the owner, or the certificate of the architect, does not always operate as a full acceptance of the work and discharge of the contractor from the terms of his contract. If, after final payment is made, omissions, or the substitution of inferior goods are discovered, the contractor can be held to the terms of his contract, as though no certificate had been issued and no payments made. An erroneous opinion seems to prevail among contractors that the moving into a building and using the fixtures operates as an implied acceptance of the work. Such is not the case, however, and whether the owner has moved in or not, if the terms of the contract have not been lived up to, specific performance can be enforced by the courts. Nothing acts as an acceptance of the work, except the Statute of Limitations, when the terms of the contract have not been lived up to, and whenever the deviation from the terms of the contract are discovered, the completion of the contract, according to the original agreement, can be enforced.