I recently had some beams installed in my basement. The installers subcontracted a plumber to reroute the supply lines to a washer and sink. Because of the new location of the supply, I wanted the laundry/sink drain reworked to a more convenient configuration. I agreed that this was beyond the scope of the beam installation job, so I knew to expect a separate invoice for the drainage work. I tried asking how much it would cost, but never got a straight answer. The only reply I got was "time and materials", but he wouldn't give me an approximation of how long it would take, or what the cost of the materials might be. They moved forward with the work, and when I got the bill I was shocked: over $750 in total. I feel like I was over-charged. They billed for 6 hours of labor, and $230 of parts. I only saw that they were there for 4 hours, max. For materials, I count about 10 ft. of PVC, 5 or 6 fittings, two 1/4 turn valves for the sink, and two new valves for the laundry hookup (I asked them to replace the values, which was also out of scope for the beam installation.). Does the $750 seem excessive? It does to me, but I'm not experienced with plumbing costs. Is there anything I can/should to do ask them about their charges?