Well, since there seems to be some further chatter about optimal density in the air, this seems like as good a time as any to address some thoughts I've been having regarding streetscapes and density, particularly in terms of height.
After all, height is a key to density in urban space: rowhouses are only so dense if they are still one story (and you can get a lot more density from buildings further apart if they're taller as well). But also density is key to density: that spacing is also critical. So what works?
1. Consistency is Key
One of the elements that I think the article I linked above does a really good job with is the idea that we're not necessarily talking about every building being the same size or shape (that's a different kind of urban form anyway), but we are talking about the default background of the city being consistent--and consistently dense.
The far side of this street in Amsterdam, for instance, is pretty much the same design (though you can definitely tell where each building starts and ends from coloration and decorative details) but the close side has clearer variation (though I'm sorry about the photo, which did not capture that as well as perhaps it might). The general overall sense of the built environment here is consistent though, on both sides of the street, even if there is more color and material variation on the closer side.
Likewise, this Parisian street scene has more variation (it's not literally all the same height) but a general consistency of size, if not appearance: it's all in the 3-6 story range. Nothing is short (no single family homes) and nothing is huge (no 8+ story buildings standing out).
That consistency is key both for a coherent urban form and for efficient use of land.
This is especially true if you have narrower streets, as in the above London picture--which again showcases how consistency of size does not have to mean uniformity of building material or appearance.
You can have an interesting, varied city without having to radically alter heights--although I do want to emphasize that I quite like the left side of the street in that first Amsterdam picture too. There's nothing wrong with attractive consistency in appearance as well!
2. Width and Spacing Matter Too
Relatedly, the width of the street and the spacing between houses/apartments/buildings/etc. is also key to effective and consistent density.






































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