Practical issue with double doors that caused us to do a single door in our project: One leverset is a dummy. We found that with the dummy lever we had on our last house that people would not know which one was the operating door and accidentally bend the lever down even though it was "fixed". It would move a bit though and so I constantly had to be resetting the lever back to the horizontal position. We opted for a single wide (42") front door in our current project. This should be plenty wide enough for even chunky pieces of furniture.

We have iron double doors and they ARE heavy. They are very well balanced though and open and close like "butterrrr". My toddler grandchildren have no problem moving them once they are open. Price these doors before you fall in love with either idea. Our door was reasonable (4K +) but they can run much higher. Your hardware for these doors is not inexpensive either, and if you have the requirements that Renovator spoke of for your area of not being able to leave one side latched- a double may not be worth the security hassles. Our double door is inside a security gated courtyard so we often leave it open in nice weather when kiddos are not around.

Let's me try to take more photos and update. Sorry the ones I have is low resolution. Sammy, the glass on top of the door is to bring more lighting into the house and stairs. It doesn't have to be directly on top but a square glass between ceiling and top of the door. Don't you think it's a good idea though? NHBabs z4b-5a NH, over time when we have guests and 1 person standing outside and 2 inside, the door is always swing back and forth while we talk and it is stucked in the middle. Two people standing inside is impossible with the door is 1 foot against the stair. Also when we have packages and left inside right at the entrance, it's very tough to move around the door between upstair and downstair... I would also think shaving 2-4" might not help it either for the space limitation but just thinking...

Pictures will definitely get you some more directed and helpful feedback.