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This is where it gets murky. I don't do much running off to get stuff any more but it used to be pretty acceptable to have to go and buy materials for the job at hand and that's all time on the job.
What happens when you get more used to your job and the material requirements, you start to turn up with a lot of what's required. In this case you've ordered it on the internet or picked it up in your own time.
So maybe you keep a box of TRV's, 150 assorted elbows, reducers etc. Washers and all that. Now you're not that different to the bike shop with stock on the shelves.
If you quote for a heating system and the quote is accepted you turn up with the radiators that you've priced and the price has been seen and accepted. If the client wanted to supply them because they think they can get equivalent cheaper and then they provide lesser quality or fail to provide it on time. That's what can cause complaints.
The problem with adding a bit to cover ‘hidden’ labour, is that most of the time the actual sourcing work is carried out within the ‘day’ you’ve already paid someone for.
‘I’ll be in late tomorrow/leaving early tonight, just need to pick something up’.