I read once that you have to build 3 houses until you get it exactly like you want it. We built ours about 12 years ago and there are a few things that we wished we did differently. For the most part, we love our house. We tried to keep in mind things that would be very expensive to redo later, and spend the money on those things in the beginning. For example:
We took our floor plan and had them make it 2 feet wider on each side. It was extra money, but well worth the extra space.
We wanted our windows to have wooden frames that are stained. We didn't want the the white plastic around it and that would be a fortune to replace later.
We wanted stained wood trim throughout the house as well, not the plastic white.
We decided not to put in granite countertops, because we wanted to spend the money on the other stuff, and figured that down the road when the countertops needed to be replaced, we wouldn't mind spending the money on granite or whatever we wanted at that time. Not a choice most people make, but we have been pleased with that choice.
In the rooms that have carpet, we bought nice carpet but didn't spend a fortune because that will eventually need to be replaced anyway.
We forgot to measure our front porch before we agreed to the floor plans, and we cannot fit rocking chairs on it. It's just a few inches too short.
We wish our kitchen pantry was a little bigger.
We also wish we had planned better with the electrical outlets.
We really wanted our laundry room on the first floor, and now we wonder why we didn't want it on the second floor. That would be great.
Also, check the layout of how the washer and dryer will be placed into the laundry room before it's plumbed/wired. We wish ours was different.
We also insisted we wanted an electric stove (we don't know why) and insisted we didn't want a gas line run. Fortunately, our contractor insisted that we put the gas line in just in case down the road when the stove needed to be replaced we wanted a gas one. We haven't had to replace the stove yet, but when we do it will be gas. We love our contractor for insisting.
My brother-in-law suggested that we put extra insulation in the walls surrounding each of the bathrooms. We didn't and wish we did. (yes, sound travels)
He also suggested that if we like to put candles in our front windows at Christmas, that we have one switch by the door that will turn each light on with one flick of a switch. We don't put candles in, but if you do, you might want to consider that.
I ignored my cousin's suggestion not to put dark fixtures in the bathrooms and I wish I didn't. I clean them, and they still look dirty after. They sort of streak. It's only the powder room, but it annoys me.
I took a friend's advice to make sure I put enough drawers in the kitchen. Thrilled I listened to her.
Spend your money on things that will be impossible to change later or really expensive to change later. And have fun!!!