nothing wrong with big squares. my worse ones are always big and sprawling. they look like freakin' warehouses. i have one i really want to tear down right now, but i also don't want to bother. it is way too big and flat, though. i built in a hurry for no good reason months ago and i don't even play those sims anymore, but every time i see it neighborhood view it hurts my soul. one of these days i'm going to destroy it.
There's a trick to fixing a house like that. Take the roof off, arrange the furniture in the rooms toward the center leaving just enough room to get around easily. Now, just tear down the outside walls and move them in around the outside of the furniture. If you have two stories, do this to the first floor first, then match up the second floor as best you can. If there are overhangs, it's not a big deal. Many modern houses have that type of modular-looking style...just throw a flat roof on top or maybe a roof patio and you're set.
good advice, but i'll still probably just move them out and trash it. it's a big lot for two sims that don't even want kids and likely never will. i just went kinda overboard because the house i previously had them living in was too tiny and i over compensated when i built them a new one. these days i try to stick to smaller, three story houses. the one i'm playing now is a fairly simple three story with a second story deck and a smaller third story with the surrounding remaining area serving as a bigger deck or whatever you call it over looking the shore and the side yard. it's simple, but i like it. well, i did until i got a dog and learned they apparently can't use spiral stairs and i had to stick and a few elevators in there because i don't like regular stairs.
the one nice thing about the "warehouse" was it was the first house i built with a garage. for some reason i could never get it right before so i always gave up. i don't know what i was doing wrong, but now that i know how to do it i've realised it's damned near the simplest thing ever and almost all of my houses have a garage.