I do all my estimates on the phone from descriptions customer give me, or photos they send, plus using Google maps,
but i always emphasise to the customer that its an estimate that I'm giving them reflecting on the information they
are giving me, it works out ok 99% of the time, i only go and quote jobs that are nearby where i live, or close to jobs that
i'm doing during the week.
I found when i started out 8 years ago, that going out of your way like a few miles to quote jobs, i met a lot of time wasters,
and i met a hell of a lot of them, so i decided enough is enough, I would say i get about 75% of the jobs i quote on the phone,
so at least the ones i don't get, i haven't wasted time & fuel going out to them.