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I mean if you asking about a job that Id do you want heating full system. I come in size it up, order the materials and you pay X I dont give a break down to how I got that figure. The price is the price. I'm not getting paid for the time I had to come to site visit and the sit at home work it out and then order all the right stuff so that's built into the price.
Say I need something that I have missed in the price, I wouldnt go to the customer "oh i forgot this its gonna be extra" Id swallow that cost. Sometimes you win on a job and something you lose.
You've added extra conditionality there - if the delay happens post hoc and is the customer's fault that's a different scenario to pricing up a big job one day-1 with knowledge that there will be inflation between agreeing the price and actually supplying the materials.
The difficulty for the homeowner is that the contractor has them over a barrel once the job starts as the WIP is worth zero (or less) if the contractor phoenixes and they have to get someone else in.