@Jonathan Greene Thanks for including me! You have complied a pretty good list of what not to do...I would add the following:
1) Do not even pay 25%. And I'm speaking as a Contractor.... I always make sure that the draws are commensurate with the amount of work (and specifically the trade) performed to date. For example - you're starting a $100,000 remodel on a propoerty that you have acquired, the Scope Of Work includes basic lipstick stuff like a kitchen remodel, a bath remodel, and new flooring and paint.
I would start with a draw of no more than $10k, that is more than enough to get anyone going and it shows your good faith. To be honest, any Contractor that asks for larger amounts of money is showing that they do not have any reserves and/or they are 'robbing Peter to pay Paul'.
After the initial draw, I would advise paying as the project proceeds - after demo is completely done (and you know that for sure if you are out-of-town), then pay for demo....only. Then, give the GC or (Tile Contractor), enough to buy the tile only...after they are completely finished, then pay them the balance due on the tile ....only. If any inspections are requirted, make sure that they are done and signed off before paying. Ask to see the permit card.
2) SOW - Make sure that you have an ironclad and bulletproof Scope Of Work! This is where most projects go south....If you and your Contractor are not on the same exact page regarding what you are expecting to receive and they are expected to provide, then you are doomed to fail. I include every single thing, however small it may seem...
3) Do not try and save by buying materials yourself. This is not how it works...well not with good Contractors anyway. You will not actually save money, and you will irritate the Contractor by penny-pinching and micro management. Any decent Contractor can generally buy products for much less than you anyway, and even if you find a special deal on, let's say, Doors and Windows...who is going to take charge of delivery, unloading, storage, security, warranty and all that? They will and they will need to be paid for it.
That's all for now, Mr Greene.....Good topic!