Loft Coop Design

The whole roof is open with hardware cloth ceiling panels. And for the cleaning comment earlier, the entire coop opens to the front with 4 big doors, and the 2x4s holding in the bedding lift out and can be used to scrape all the bedding into the run or a wheelbarrow. This really is an excellent setup and we've found it incredibly easy to use and maintain. The chickens are thriving in it. We only have 5 hens roosting in it now (6 more in a brooder we built in the coop) but they use maybe 1/8 of the roosting bar space. I wouldn't put 20+ chickens in there but it's plenty big for a small flock.
Welcome to BYC. Where, in general, are you located? Climate matters, especially when building your coop.

Coop-run combinations with the coop portion elevated are very common and can be well-suited for many situations. However, the one in that particular sketch looks to have no meaningful ventilation at all. Additionally, it would be very difficult to clean since no one door allows access to the entire space and, if those support posts are 4 feet apart, it is far, far too small for 20 chickens. :)

Given the usual guidelines, each adult, standard-sized hen needs:

4 square feet in the coop,
10 square feet in the run,
1 linear foot of roost,
~1/4 of a nest box,
And 1 square foot of permanent, 24/7/365 ventilation, preferably located over the birds' heads when they're sitting on the roost.

Therefore, for 20 chickens you need:

80 square feet in the coop -- that's 8x10. 6x12 would be just a little tight, but probably manageable in a warm climate with an over-sized run.
200 square feet in the run -- 10x20 or 12x16. 8x25 isn't a very practical dimension in most situations.
20 linear feet of roost -- for larger flocks like this it's best to have roosts arranged so that dominant and subordinate birds can separate themselves.
5 nest boxes,
and 20 square feet of ventilation. How you can best provide this is one of those places where climate matters because though cold-climate chickens need as much air as hot-climate chickens it's harder to arrange it.
 

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