We got the final invoice from our contractor last night, so i read through it with DK and called out some of the charges that seemed questionable. We did have a few scope changes which I was happy to pay for (e.g significantly more expensive tile, new doors, new toilet, shower door) - but there were some labor charges that were added and some red flags on tax stuff.
I marked up the invoice and called the PM, and ended up cutting off about $1300 in charges - enough to cover the deductible for the insurance portion of the work, and the cost of the new over-range microwave that I bought.
PM was impressed that I called him prepared, with a clear understanding of the jargon and abbreviations that he used in the quote, and agreed to everything that I asked him to remove. He said he's never had that type of conversation with a client before - I was like, "I've been telling you all along, I do this stuff for a living -just on a much bigger scale (multi-million dollar chemical plants/manufacturing facilities/R&D labs)."