There are no "builders" as this is a word picture referring to an ancient building technique1.:
But like all the other Psalms, the whole point is for the reader to trust in God for deliverance from whatever enemies they happen to be facingfrom whatever enemies they happen to be facing. Thus the Psalm is aPsalms are homiletic work that isworks intended for application by the worshipper.
It is in this sense that Jesus applies Psalm 118 in Matthew 21:42-45 to the husbandmen in charge of the vineyard in Matthew 21:42-45. It was understood that the vineyard was a type for Israel, and the husbandmen would be the religious leadership of Israel -- not "jews", which were the vineyard, but the husbandmen tending the vineyard: