Pride Plumbing came out and provided a cost estimate to repipe and replace the cast iron drain lines under the building in the crawlspace, going to the fixtures in a kitchen (sink) and one bathroom (sink and toilet) - replacing 1) the toilet bowl's flange and wax seal, and 2) the P-traps underneath all the sinks; along with installing new PVC piping, fittings and supports under the building for each fixture.