[Caged Great]

Here's some suggestions from a designer.

Make sure that small things like heating vents are in places that make sense. I have seen tons of examples of where heating vents are in such stupid places that it makes life difficult when putting furniture in. For example, in my house in the living room, the only place to put the sofa is over the heating vent. All the other walls are too small to accommodate one. Same with cold air returns, make sure if possible to put them in the most discrete place possible.

Put all the light switches in the entire house on dimmers if possible. It's not a big expense, but it's definitely a huge plus when you go to sell.

Get a time controlled air fan switch for your bathrooms with showers. It'll save a ton on electricity and is a decent feature to have when you go to sell.

Get a good underpad for carpet. 70% of what makes a carpet feel good is the underpad.

As for the rest of the things, it really depends on what exactly you're going for.