How about 11 ft ceiling height throughout the first floor and 10 ft on second floor?

Good day if i want a loft bed style?

like small room under and like a small living room and the upper will be the room my ceiling should 10ft or 9ft?

Can i use 14 feet ceiling below an 12 feet upstairs

In a public space - hall, hallway, entrance etc a larger ceiling height feels ok, but too high a ceiling in a bedroom feels uncomfortable. Same applies to dining, lounge, living rooms and kitchens. It’s to do with how we as humans relate to space and the objects around us.

I have 10’ ceilings in my home. I wanted to do a coffer ceiling in the great room/kitchen area, but it was cheaper to do a cathedral and stained beams. I do have a storage area and a big 600 sq ft room open space on the 2nd floor. My old home had 8’ ceilings. I didn’t think about how it feels to climb all those additional steps with a 10’ ceiling. At 12’ you may need an elevator! If you go with 12’ ceiling, you may want to add electrical for window blinds so you can open and close them remotely.

This is an old post, so I’m going to comment for those who are currently researching….

10’ ceilings minimum on the first floor. 12’ on the first floor is my preference, especially in the south (to me, it does not feel uncomfortable in any way).

I would suggest using 8’ tall doors in a home with 10-12’ ceilings as well - it is imperative for scale.

Windows will have to be scaled as well. Please think about how the exterior of the home will look. Be consistent and design symmetry into your plan. If you’re going with 10-12’ ceilings, transom windows above the main windows is an excellent way to increase window height and architectural interest.

If your ceilings are at least 10’ high - you’re good. Any lower and the space feels claustrophobic and dated (and not in a good historical way). You can go 9-10’ ceilings on the second floor.

If you are concerned about the utility costs - research and speak with a very knowledgeable HVAC person. There are methods to reduce the burden.

Those two-story high living room & foyer ceilings of the 90’s & 2000’s McMansion variety are outdated and a waste of space that could be second story square footage - and yes, those can feel uncomfortable.

This is an old post but there's some important consideration with a very high (10'+) ceiling. For the most part, adding that much volume is more to heat and cool. For heating a lot of the hot air will rise to the ceiling, do not good for the occupants, and to cooling, if your HAVC is up high, you'll lose efficiency as the cooler air has to sink ( although a fan helps). also, especially with cathedral ceilings, it is much more expensive to insulate, especially in "heating" climate, although in cooling the same would apply. and your lighting is way up high too, so you'll need other more fixtures, or brighter ones.