My contractors are charging $120.00 to rekey and secure. That's what Fannie Mae will reimburse. Some other lenders have a $75 max figure. Considering that 2 knobs and 2 deadbolts only cost $20, that leaves a $55 labor cost. However, if you're dealing through Safegard, Cyprexx, AMS or similar, they have stupidly low pricing for their contractors in spite of the fact that they charge their client full price.