Ye but they dont graft for that
Very true, I am only testing the waters to see if it's worth it for repeat business. And if it's not going to be a quick job I'll advise that it will cost more. Example, 2 weeks ago I fitted one in a stone cottage with 400mm ish hard as nails stone walls, took best part of an hour and a spent drill bit just to drill through, so that one cost £120.
I have been fitting outside taps for years, but have never, ever fitted one 1/2 hour. I suppose you could do it that quickly with a cheap B&Q self cutting crappo fitting.
Don't want to ruffle any feathers or anything, but that may be the difference between a handyman and a plumber. As long as there aren't any hidden issues like difficult to drain/refill cold pipes, boxed in pipework or silly stone walls half an hour is fast for fitting one but not uncommon. You're probably faster than me at the other services you provide, but I do plumbing day in day out and have done for years.
Isolate and drain down(<5 mins)
Drill through and fit wall plate and bib tap (10 mins)
Cut feed (2 mins)
Cut, clean and assemble pipes/fittings(5 -10 mins)
Solder up(2 mins)
Turn mains back on and run taps etc. (5 mins)
By my reckoning, you may even get a minute to eat a Jaffa Cake/chocolate hobnob while admiring your work
Not sure of the price of a b&q garden tap kit, but I'll bet it's not cheap compared to getting the bits you need from a plumbers merchant(I'd guess at about £15 for individual parts from Plumbfix + a couple of bits of leftover pipe from the toolbox). I actually used to fit the kits with self tappers when I was at college as pocket money jobs, must have done a dozen or so and not had any come backs from them, I fitted one in a house I rent out about 8 years ago and it's still going strong. Obviously wouldn't fit one now, not because they are rubbish, they're just not as good as doing it properly