Just moved into the house build I was working WAY back when this thread started. It generally turned out awesome.
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Two regrets:
I didn't pay enough attention to the plumbers and they used a 1" trunk and branch system for the hot water distribution. Under a slab. Hot water took forever, and I had to install a recirc system using the cold water pipe which isn't ideal. A home run system or a dedicated recirc line would have solved that neatly, but is the kind of thing you have to specify.
Outlets in the closets. EVERYTHING is cordless now, so charger outlets in the closets would have been far more useful than extra outlets in the halls. Also gives you a place to plug in stuff like wireless routers, etc. I did add desk level outlets in the office, and those are handy.
Stuff I don't regret.
- Using a small general contractor that was dedicated to the project. We finished two weeks ahead of schedule (5.5 months under construction), and on budget. That is extremely rare in the current building environment.
- deep (2x8) walls with a blown in dense pack insulation. Cuts the wind noise down and makes for a very stable indoor temperature. It's not as flashy as something like a kitchen or bath upgrade, but you only get the chance to do it once.
- Triple pane windows. Same comments as above.
- Radiant heat. Slab on grade has drawbacks for the other mechanical systems, but it's pretty nice for heat.
- HRV (Heat Recovery Ventilator). With a tight house in a northern climate, these are really nice. Because of my home design, I used a ductless system built by Lunos. Jury is still out on ducted vs ductless, but so far so good.
- Single story. I don't miss stairs at all.