I can give you a good idea over the phone of whether I can do a particular job and how long it is likely to take.
We can then arrange a suitable time for me to visit.
When I arrive, I will confirm or revise the estimate based on what I find. If it is clearly going to take a lot longer than expected and you decide not to go ahead, or if I decide I can’t do the job, then I won’t charge you anything. If you are happy to go ahead then, I will do the job there and then. For larger jobs, I will usually make a separate visit first to give you an estimate.