Just done that, thanks.to come and do your little job, a builder has to make the effort to come over and allocate a period of time to it -as somebody above said: probably half a day.
Its one of those jobs that could take half an hour or 3 hours.
A tradesman is always going to charge a half day -think of it as a call out charge.
try posting what you want on a local village facebook group or nextdoor -you might get a college student to do it for you, say for £50
Local handy man just quoted £45 and said its 2 hours of his time.