Pretty similar to native european and american huts.
African wooden architecture also tends to lack load-bearing timber frames, sophisticated ceiling and roof, and good foundations. African grass architecture is even worse, almost on par with Neanderthal mammoth houses made some millenniums ago :
A rare instance of (dry) stone architecture in inland East Africa are the ruins of Thimlich Ohinga.
In Southern Africa, we mostly see grass architecture similar to Neanderthal architecture, of this kind :
Supposely? I will talk about this below.There are also a few instances of dry stone architecture, usually in the form of walls, as we see in Sotho-Tswana and Shona(supposedly) architecture :
So? I will tell why "so" below.On the East African coast, we start to see much more advanced architecture than what we have seen so far, among the Swahilis, where we also find internal aqueducts and cisterns. This architecture seems to mostly take inspiration from Persian and South Asian architecture.
The "so" means that inspiration as with Swahili, or even being told how to build means nothing for you, only if they are Black africans non-cushitic. All of the buildings you postes about north and northeast Africa is inspired, to be exact, they were told how to build this things. Aksum, or morrocans or semitic groups didn't invent this buildings. They are just techniques they learned, techniques that were developed thousands and thousands of years before Christ/Common Era, and generally included math and script, things that most of them didn't invent on their own. It seems like only black people can't build based on foreign influence.In North East Africa, we start to see much more impressive and less primitive architecture, on par with its contemporary in other parts of the world, and with much more floors.
Interestingly, in countries like Ethiopia, we see a gap between the Northern and the Southern part in terms of architecture, with most of the impressive architecture being concentrated in the more Semitic Northern part of the country, and the more primitive(on par with Neanderthal mammoth houses)
Berbers before arabs and Anglo saxons before Roman expansion had the same kind of architecture. Huts. Very simple. I won't even quote celts, but they were better than anglos.
Let's take Great Zimbabwe. It's huge. It's large. It's thick when it comes to walls. Stairways and conical towers. Societies around the world took thousands and thousands of years in the area to achieve sophisticated level of architecture. The Shona people build that in 700 years, after their arrival. Too little. Of course they had iron and agriculture advantage, but it is fast yet. It wasn't built after middle ages, even if it were it's irrelevant. Middle Age is a term created for Europe, after thousands and thousands of years, but it is applied to other parts. They (africans) were escaping from diseases and dangerous flies and trying to get in a "safe" place. They got it, some time after that they reached a good level and built a sophisticated civilization. The portuguese that already had built castles thought that it was impressive. The english thought It was impressive. Archeologists, racists and realists, thought and think that it is impressive. The building was even compared to phoenician palaces, though it is completely different. Great Zimbabwe is really great, not primitive. Catch the persian architecture without sumerian influence. What berbers have? What most of semitic ethiopians have? Without foreign influence, few of them really achieved some good level of architecture. Africans have Great Zimbabwe. They didn't supposely built, they really built. It's a fact, the 100 years of archeology and 300 stone-walled sites don't deny. The only reason there aren't others as huge and as large as Great Zimbabwe, or as big as Khami is because native africans in Zimbabwe didn't borrow writing and math like arabs or europeans or cushites. We really don't know if nuraghes were result of foreign influence like minoans, but it doesn't make Zimbabwe primitive.
And why are you so obssesed with floors? I hope It's not a new requirement for civilization, we already have to deal with the wheel (that not even egyptians invented).