built in expese difference
Because they have no idea how many people are going to purchase them as well as what size they'll want,it is more expensive for manufacturers to make the built in applainces.The factories in most cases have to hault manufacturoing a specific model to make the other depending on the size(mostly width which can be 24", 27",30",36" or 40".)and whether it's convection or not.Also,single or double oven regular or microwave.Generaly,built in dishwashers are less than the free standing ones and of course cooktops, gas or electric,are going to usualy cost less than a full range.Their manufacturers try their best to accomadate customer needs but there is a price for that.Built ins years ago were a lot less because they wern't as popular and their sizes were limited.Afetr around the early 70's,their prices increased dramaticaly.