So you see, the eight-foot-wide
house is not silly at all. About 32 million Americans are
already living in them. Instead of a trailer, you could just
build a normal structure of the same dimensions, and live there
in a respectable way, without thirty years of debt slavery. On a
20x50 plot, you would have enough room on the side to park two
cars end-to-end, and also have a nice backyard of about twenty
feet deep.
The other form of "manufactured housing" today is actually
something much like a normal house, for long-term residence,
although they too tend to be long and skinny. One manufacturer
of these houses is Clayton Homes, which is part of Berkshire
Hathaway, Warren Buffett's company. (Clayton accounts for 47% of
total industry production.)
I was hoping that I could find a way to simply plug these
existing manufactured home models, from companies like Clayton,
right into my overall design. However, that didn't work as well
as I hoped. The basic reason is that they tend to have pretty
large footprints, of about 800 square feet. It is hard to fit an
800sf footprint into a 1000sf plot and have enough room left
over for parking and a little yard.
However, we can say this about them: they are cheap. Clayton
makes 800sf models for as little as $45,000, which is only $56 a
square foot for new construction. I've seen similar size models
from other companies for as little as $21,000, although I bet
the build quality is truly hideous.

Clayton Homes 800sf house plan. The dimensions are
approximately 15x53 feet.
"Our country's social goal should not be to put families into
the house of their dreams, but rather to put them into a house
they can afford."
--Warren Buffet, 2012
This particular plan, as you
can see, is in "shotgun" configuration (the front door is
along the narrow side), with a nice porch in front. The
price for the basic model is $45,000.
However, the footprint is quite large, about 15x53. You
could fit it in a 25x60 (1500sf) plot with side parking, or
in a 17x70 (1190sf) plot with parking for one car in front.
If density wasn't that much of a concern, you could do
something on a 25x80 foot plot (2000sf), which is still
pretty dense actually, and the result could be pretty good.
But, that isn't our design goal here.
What I'd like to see is for a manufacturer like Clayton to
provide smaller models, for example 15x25 (375sf), which is
still nearly twice the size of that Airstream, and which
would allow us to fit it in a 25x40 (1000sf) plot with side
parking and a little backyard. Plus, you'd think they could
do it for $25,000, since it's smaller. For a larger model,
could they do two stories? They could also do a narrower
version, perhaps ten feet wide and 35 feet long, which is
still two feet (25%) wider than that Airstream, and a lot
longer too.
Mostly, these manufactured homes, especially the cheaper
models, look pretty awful, particularly when viewed "in the
round" in the middle of a big lawn. They're cheap and they
look cheap. However, if you used them in "shotgun"
configuration, you would only see the front facade. It
wouldn't take much to make a nice front facade, since it is
only 15 feet wide, or maybe even ten feet. Build a nice
porch out of Genuine Wood, paint it cheery colors, and the
result would be pretty respectable.