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this is assuming the quote includes an hourly rate, maybe its a "labour" line item in which case charging % for admin of part procurement is slightly clearer.
The alternative is they up the hourly/day/labor rate or cost. It doesn't really matter as the quote will be the quote.
Maybe the answer is to add an admin line to the quote, and a pension contribution line, holiday and sick pay lines, insuramce, travel, vehicle upkeep, training contribution.
and also to charge for providing a quote as that is time/SKE
Great read the past few pages. I've no idea if the tradesmen I've used have charged me on top of the cost of the materials for their buying / choosing / whatever (is that the root of this discussion? I've lost track). It's never occured to me that this is something that happens tbh.
Had I known I probably would have been a bit miffed about it. I've no interest in buying the materials your need and I'm happy to leave that to you as the expert.
However, I'm already paying you once for your expert opinion, knowledge of what to buy and contacts of where to get it in your daily rate. Not sure why I'd have to pay you extra to apply that knowledge at the builders merchant vs in my house fitting it.
Software developer here, If I was consulting I wouldn't charge extra to do it if one day I had to apply a slightly different subset of my knowledge in a different location to the usual one.