I started a similar thread
interested-building-my-own-home last year. Lots of good advice and reality checks.
We ended up buying an existing home and do a major remodel. Things to not skip (if building new)
- wider than normal hallways. Make the home feel so much more spacious
- good lighting
- lots of electrical outlets
- central vac
- a 1/2 bath near main living space
- 2x6 exterior walls and lots of insulation
- single level if at all possible (lack of noise and great to retire in)
- indoor/outdoor living concept