Fixing some one elses junk is Time and material only. Latest job of this, I thought the company before me was decent and did good work-- Wrong. So far I have over 90 man hours in just finding what they did and did not do. Plus 15 hours installing all the switches, receptacles and luminares.
Walking the job before hand, I estimated 40 manhours tops.
Thank goodness I bid at time and marerial only.
