@millworkman thank you for the response. Unfortunately, I do not have any photos because the work is not yet done. It is a modern California style home with a flat roof. 1st floor has 10 ft (8’ interior doors) and 2nd floor (6’8” interior doors) has 9 ft ceilings.

Walls will be painted white. Floors will have 5” natural white oak floors. Interior doors will be white with black hinges and hardware.

Furnishings will be modern; 1st Fl open concept where the kitchen will open to Family room with a linear fireplace.

Windows have been installed and has black stains. The trim around the windows will also be black (not yet done).

Question is- with the black stained windows, if we put white minimalistic (maybe 3” or less) casing around the white interior doors and use 1”x6” modern baseboards also painted in white, will this combination work with the black trim windows, or must we put in black door casing and black baseboards.

No black casings and/or baseboards. White will be fine. All the same white.

Just because your interior window trim is black doesn’t mean your baseboards and door casings must be. Seems like designer Jeff Lewis does black interior window trim too. With 10’ ceilings you may consider larger baseboards and trim though. I’ll try to find the article referencing architectural dimensions.

https://www.houzz.com/magazine/how-to-size-interior-trim-for-a-finished-look-stsetivw-vs~2934773

Virgil and Joy, thank you so much for your input, for the informative link, and most of all for reassuring me that white baseboard and casings can be used.

From Joy’s link, this home with the floating stairs (we will have 4” white oak threads with black stringer) resembles the modern home we are building.

If 6” baseboards are used, then door casing should be 3” or is there another dimension recommended for a modern look? Not certain what is used in this photo.

Yes, door trim would be half the dimension of the baseboards. Are you set on 6” baseboards? We have 9’ ceilings and used 7” baseboards based on the recommended 7%.

Hi Joy, good point. In that case, the 10 ft ceiling on the first floor, will it be the 7” (same as 2nd fl) or 8” baseboard? I was planning to use the square edge boards.

With the higher boards, do I need a quarter round or just leave it like the photo from the house above?

For consistency I would probably use the same size baseboard on the first and second floors. I wouldn’t use quarter round but this is all IMHO. Be sure to share pictures when you’re done.

Hi Joy, thank you again for all the recommendations! 😬😬

I posting a few picture from my house. Maybe it will help you. Ceilings 9ft, baseboards 5 1/2", door casing 3", window (didn't catch mistake) 3 1/2".

Hi J, thanks so much. The photos really help! Your home looks beautiful. Love the glass on the stairs! 😍😍

What style of shoe moulding will you be using for the baseboards (if you are using them).

@A Naka, we didn't plan to have any, we hoped/expected for the baseboard to be better with no significant gaps. We are leaving baseboard as is for now. We had a long and exhausting built and we need to take a breath lol

Hi J, I am also leaving it off but the builder said he can’t guarantee there will be no gaps between the hardwood and baseboards. And yes, I am feeling the same. So far, everyone had told me it’s worth the wait. 🤞🏻🤞🏻