tex...........
Well, are talking 3mm or 6mm ?? At that size, I wouldn't consider doing 3mm as it would look terrible. So, it's either gonna be around $150 or $90 invested in substrate alone. Your vinyl is about as cheap as ya can get, but still with laminate, about $125. So, you are now giving pricing for about the lowest level of sign there is and you have about $225 or a little more without any markup or profit. Let's not forget to mention overhead. Electric, insurance(s), licenses, heat, A/C, paper towels, gasoline, alcohol, squeegees and all kindsa other incidentals. That should all go into your cost. I'm sure you're gonna need a helper to put up a 4' x 10' sign, so paying his/her time, too. Installation would be around 2 hours plus travel time, but you also hafta rent a lift. Are you getting reimbursed evenly or making a little something for going and picking it up and returning it ??
In the end, you had your phone time, quoting time, design time, peeling off mask on both sides, putting the laminate on and putting the vinyl on the substrate time. All those things sound petty, but when you add them up..... if you do 10 projects a week, that could add up to quite a few hours of unpaid time. But according to some here, making $150 is really good money. Maybe it is, if you don't consider all the things you aren't charging for. Oh, did the 4' x 10' jump off the truck and hop into your shop.... or did you carry it in ??