Craftsman style, with a slate roof and copper gutters that will not need any particular attention or repair for 50 years.
Storage space.
Radiant heat, plus air conditioning. Yes, I know the AC needs ductwork, so why not heat through them? There’s just something about warm floors that appeals to the tiny reptilian core at the bottom of my brain.
Electric outlets will be on separate circuits from lighting. Circuits will feed at most one room, so overloads are less likely and less disruptive when they do happen. Wiring devices shall be commercial or industrial grade - none of those nasty 59-cent outlets allowed.
Cat 6 will be run to all rooms and home-run to a dedicated network and phone switch room. No more balancing routers on the freezer in the garage…
Storage space.
Central vacuum system.
Woodworking shop large enough and stocked to make Norm Abram envious. Enough floor space that I don’t need to do the ‘move the table saw away so I can pull out the router table’ two-step. A dedicated finishing room will be part of the shop.
Instant tankless water heaters at all points of use, enabling us to run laundry, dishes and multiple showers at the same time and not run out of hot water.
Laundry will be adjacent to bedrooms, and will have a dedicated folding table and ironing center.
The kitchen…
Full pantry
LIGHT!
COUNTERTOP OUTLETS!
A dedicated patch of land for the stand mixer to stay on, plus adjacent storage for its attachments.
Dedicated spaces for the smaller appliances like the blender, food processor and coffee maker to life on.
A coffee station - some place next to a sink and under the cabinet where the coffee cups live for the coffee maker, the coffee and sweeteners to stay. If we upgrade to a plumbed commercial style brewer, this will not need to be next to a sink.
Two dishwashers, preferably of the drawer design so we can run either tons of dishes or just a few. When we entertain, we average about half a load per guest with all of the cookware, dishes and glasses, and we’re not even being particularly fancy.
Handwashing sink with foot pedals, like at a hospital so you don’t have to touch anything with sticky or greasy hands.
Built-in “dustpans” connected to the central vac system - just sweep the floor into the pocket and it’s sucked away without needing a dustpan.
Pot-filler faucet at the cooktop.
Gas cooktop
Electric convection wall ovens
Solid-surface countertops with seamless sinks. No tiny corners for nasties to grow in.
Storage space. (Did I mention that my current house has very little storage space?)