Build 1 DH or 2 single-family houses on the plot?

under certain conditions possible indeed (e.g. building enclosing walls without openings, see §6 LBO_BW), but not recommended (see ).

However, I did not actually mean windowless walls – rather, that the sun does not cast light like a guillotine at multiple times of the day (and for that reason alone one should not reduce the neighbor distance to the narrowest possible light shaft). Otherwise, freestanding would be bought at the cost of gloom.

Darker than the alternative DH, it is not fundamentally. So why does one pay for it with darkness?

Why do you buy it with gloom then?

Insofar as a "real" free-standing with grown-up distance would be more favorable for lighting.

But it will not be gloomier in principle than the alternative DH.

Exactly. Lost house width for no gained light advantages.