I have chosen to stock all of the Artique and most of the Crescent rag, suede, and some of the linens in my shop. I only show what I stock. If the customer wants something other than what I show on 2 rull racks of mat samples, I will order it for them if it is available and, up front, tell them that the board is a special order and will have to be paid for in its entirety. If they want the leftovers I give them what is left. Most times they don't. But that is the only way that I will charge the prices that were quoted in other posts to this question.
If I have to cut a 4x5 out of anything that I have in stock I charge for the size of the cut mat including the labor. If I wanted a model of my shop built for some reason, I would get a price up front from the model builder and, chances are good, he would have enough stock laying around to build it without ordering a complete set of materials to do the job.
John, your example is good for a large complex representation of a building but I doubt that it would take $800 worth of materials to build a $300 model. How many times have you had a cutoff matboard in your shop that you could cut a customer's mat out of?? Are you charging that customer the price of a full sheet of matboard for that job?? If so, I don't think that you are doing your customers a just service.
Looking at this another way, suppose you had a customer come in for a Crescent 1600 mat for a 5x7 frame. You charge that customer for the full price of that board. Then, just by sheer coincidence, you have another 3 customers come in asking for 5x7 mats cut out of the same 1600 board. Do you charge each of them for the cost of a full board? Man, if I could get away with that kind of retail sales and still be able to sleep at night, I would be very shocked at myself!
I am not an advocate of giving away my talents but there is a limit to what I will do to make an extra buck. I want that customer back in the future for more framing and I doubt that they would EVER return if I socked them $25 or more for a mat that I could cut for them in the time it takes to browse around my frame shop.
Framerguy