Interesting thread.
But I highly doubt these numbers are viable especially in 2019.
Wapi Pablo I want to ask him a few questions on his 15k per sqm claim.
This is totally impossible unless one is using the cheapest of the cheap finishings (simiti floor, no wood anywhere in the interior, concrete and MDF kila mahali and the cheapest of Chinese tiles). Such a house/apartment cannot sit well in the leafy burbs of DC for example where the wood floors alone will set you back a cool 400k or more for an averaged sized maisonette. Nobody will want to buy or rent it if it is built in a leafy burb. Maybe those numbers will make sense in the very low income hoods,
Unless you are building those "concrete tombs" we see a la Kayole, Umoja, Zima et al, those numbers simply do not add up.

Many years ago (I suspect you were still in high school), one of the most active wazuans was the in-house architect. He goes by the name A4architect.

He has a successful practice in Karen next to the shell petrol station at the junction of karen plains road.

He has done not less than 30 posts where he exhausted the issue of costing in construction projects. He has actually offered discounted consultation services to a good number of members here.

That is why most of us are silent on your question. Because we got an expert's opinion many years ago.

You have demonstrated over and over that you haven't quite grasped the wazuan spirit of educating each other through incisive debates and conversations.

Would you believe there are many wazuans who are on their 2nd and 3rd residential house project ? I know one who we started with in rongai around 2004, built a second in membly around 2013 and now working on their home in one of the poshest suburbs.

And they hardly post anything on real estate threads. They have gladly left that to you.