Pride Plumbing came out and provided a cost estimate to perform the following work: 1) drill down through the floor and into the crawlspace to install new PEX water and PVC drain lines for a sink; 2) run a new PEX water line from the new sink area over to an existing water line underneath the building and install a new water supply stop on the water line; 3) connect the new PEX water line to the sink's faucet; 4) install a new PVC P-trap and drain assembly underneath the sink and down through the floor and make the appropriate drain connections to the sink and underneath the building; 5) test for leaks on the new water and drain lines; and 6) perform a leak search in the ceiling where a water stain has recently presented itself.