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I don't want the AC return duct anywhere near the living room. I've had a couple of houses where I had to turn the volume up on the television every time the AC kicked on.

You may be talking about the air handler. That can be mounted in the attic. Metal ducts are quieter than the flexible one, but a bit more expensive.

The walk in closet that opens to the bedroom and master bath is nice. We have that.

Get the outside hose spigots with the valves inside the wall. The kind used up north. They don't freeze.

We built our laundry room near the bedrooms. That where the dirt laundry and the closets are. One end near the master, the other end near the kid's. Works well. We vented the dryer with a 4 inch pipe in the slab to the nearest ext wall. We have a tall slab.

Place conduit under every sidewalk, driveway, porch and patio for future build-out of electrical or whatever.

Gutters and/or French drains. It will protect your foundation.

If you put in a garden tub, ask for at least a 3/4 inch water supply line. Those things take a lot of water.

Not er'body is from Mamou. Raise them shower heads to 7ft.

Single basin deep sink. For the gumbo pot.

Make room for a drink (your old) fridge with ice maker tap. Extra ice and extra freezer space.

Put a shower stall in any half-bath. Add a 3x5 window and closet to any hobby or media room. It all helps with appraisal and resale.

Acoustical/batted insulation between common bedroom walls and family rooms, don't forget the ceiling. Keep the magic in the room where the magic happens. Also, shift-workers might appreciate a quiet day-sleep.

Don't put the TV on the fireplace.

I saved the most important for last...

Think about you or any member of your family becoming disabled. 36 inch doors. Wide hallways. No tight corners. You get it the idea.