Pat Hanson of gh3* is absolutely right with her comment, here, about why we are seeing more windowless bedrooms being built in Toronto:
In much the same way, some of Toronto’s development policies encourage windowless bedrooms. “I don’t think it’s driven by cost,” says architect Pat Hanson, a founding principal of gh3* and a member of Waterfront Toronto’s Design Review Panel. “It’s driven a lot by building forms. Where you find a lot of these inboard bedrooms is in the mid-rise type.” The requirements to step back mid-rises on an angular plane, she adds, forces the developers to populate their projects with very deep units.
This condition is being driven by building forms and by overall housing affordability. Here is a post that I wrote on this exact topic back in 2017. The numbers are dated. I cited $857 per square foot as the average price of a downtown Toronto condo. But the forces at work remain the same.
And they are not entirely unique to apartments and condominiums. One of the reasons why many condominiums are becoming long and skinny — and getting designed with windowless bedrooms — is the same reason that many cities, like Toronto, have long and skinny single-family lots.
You can certainly find wider lots, but it’ll cost you.
BRANDON DONNELLY 
In the world of single-family housing, lots are not sold by the area but by the “front foot” – i.e. how much frontage you are buying. The depths are typical and established by the local zoning bylaw and the lengths of the blocks are also finite, so the amount of frontage you get is the defining factor…apropos of your point above.
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Precisely
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There is an argument to be made for windowless bedrooms: better sleep. A black box that acts as a cocoon and promotes better sleep and thus, better health.
I used to live in a condo where my bedroom had windows on 2 sides. Needless to say it was BRIGHT. Never slept well.
I can always enjoy the views from the living room.
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