Edit: Originally I asked this question about "houses" in general, but several comments made it clear to me houses was too broad a scope. So I've edited this question to restrict it's scope to a certain type of dwelling, and I will ask further questions in series about other dwelling types in the future.
Say that humans are generally nocturnal, save the occasional day lark, and they have cat-like eyes which allow them to see clearly in bright and low-light conditions, though their maximum sight range is less in the dark than it is in bright light. For the purposes of this question, they receive vitamin D and other sunlight-borne health benefits from a special adaptation that isn't relevant to their architecture.
It's the seat of the lord of the manor, an important cog in the feudal system, found in the country, overlooks (hopefully fertile) grounds, and may or may not benefit from notable material affluence. Several different classes of nocturnal humans live here. The lord himself is a busy guy but is generally found at home administering his estates. So too, the lords family, who lead fairly comfortable lives with a lot of time spent at home. The lord has several servants who live in the manorhouse or nearby on the grounds and spend a lot of time in the manorhouse and surrounding yard. There are other tenants and workers of the land, but they live elsewhere and their dwellings don't factor into this question.
With all else equal to diurnal humans, what architectural innovations do nocturnal humans develop in their manorhouses to maximize the advantages and minimize the disadvantages of nocturnality? Do they use more or less windows? Do they build in different areas than diurnal humans would? Do they structure or furnish the homes differently? What innovations to they develop to maximize the utility of moonlight and starlight? Is directionality as important as it is for diurnal human homes that try to maximize the utility of sunlight? What security concerns may they have about their home, being generally asleep during midday and most active during midnight? How do they alleviate those concerns?
Below are some assumptions/deductions I've made regarding the above slew of questions. Ideal answers should fact-check and correct or expand on this list.
- Windows and directionality are probably still important. We diurnal humans use these tools to manipulate not only light, but temperature too. Also, we like being able to see outside places from inside places, you need windows for that, and the direction a window faces is important for seeing the outside places you are most interested in. I can't imagine why windows would take many different forms than normal, or that directionality would focus on a different axis than normal (it seems to me that the heat-modulating benefits of directionality aligned with the sun's course throughout the day are more important than the light-modulating benefits of directionality aligned with the moon's course throughout the night, but I may be wrong). Perhaps skylights would be more prominent to maximize the utility of moonlight and starlight.
- To the best of my (layperson's) understanding, colors would be dim to indistinguishable at night, even with night sight. We might assume then that differing texture and pattern is more important in furniture, so that different objects in a room can be more easily distinguished between.
- For similar reasons as above, homes may favor wide, open floor-plans with fewer confounding visual elements. Very chic.