With some exceptions, every site is different. The lot may be shaped one way or another. Maybe it's long and thin or maybe it's roughly square. There might be a tree that you want to save.
Maybe the area is hilly and the lot slopes downward from back to front, so you want to build on the flatter front portion because it's easier, and there's adequate drainage so that's OK. Or maybe there isn't adequate drainage so you'd be better off putting the house on the higher part of the lot.
Maybe there's a two-story house next door and if you put windows in the wrong places, they can look right down into your bedroom. Or maybe there isn't and you need all the windows you can get on that side of the house because that's south-facing so it's the best place to have them from an energy efficiency point of view.
If there's an alley behind the house, you probably want the garage to back up to that. If there isn't, you'll have to put the driveway on the front. Unless it's a corner lot, in which case you might want it on the side if the street on the front has heavier traffic or bad visibility.
Maybe there's a view so you want the living room on the back of the house so everyone can enjoy that view. Or maybe the view is to the side so you want the living room there.
You get the idea. The best house you can build on a piece of land depends on a lot of factors specific to that piece of land. So customized designs help you achieve that.
Yup, to expand on that you don't even need to make it bespoke. Just having the option to mirror a floor plan makes a huge difference in how well you can use a plan.
We did that with our new house, flipped where the kitchen/livingroom would be so the good view out of the back of the house is much more usable. Super easy to do with a stick-built house, probably a fair bit harder with modular.
Maybe the area is hilly and the lot slopes downward from back to front, so you want to build on the flatter front portion because it's easier, and there's adequate drainage so that's OK. Or maybe there isn't adequate drainage so you'd be better off putting the house on the higher part of the lot.
Maybe there's a two-story house next door and if you put windows in the wrong places, they can look right down into your bedroom. Or maybe there isn't and you need all the windows you can get on that side of the house because that's south-facing so it's the best place to have them from an energy efficiency point of view.
If there's an alley behind the house, you probably want the garage to back up to that. If there isn't, you'll have to put the driveway on the front. Unless it's a corner lot, in which case you might want it on the side if the street on the front has heavier traffic or bad visibility.
Maybe there's a view so you want the living room on the back of the house so everyone can enjoy that view. Or maybe the view is to the side so you want the living room there.
You get the idea. The best house you can build on a piece of land depends on a lot of factors specific to that piece of land. So customized designs help you achieve that.