As a general rule, prefab coops will actually only house half the number of hens comfortably than they advertise, which would appear to hold true in this case.
A VERY general rule of thumb for the minimal space needed by adult hens to prevent pecking damage, feather picking and even cannibalism, is 4 sq ft in the coop and 10 sq ft in the run per hen. It is also true that they prefer a good deal more than this.
If you live in the more southern US, an enclosed coop is usually a mistake because it does not provide enough breee and can't be cooled enough. What works much better is a three sided structure with an attached outdoor area with hardware cloth for sides -- hardware cloth because it can ve constructed strong enough to keep most predators out. Your chickens will attract the city living raccoons, coyotes, etc., plus (usually the worst predator,) stray or unleashed dogs. Chickens tolerate cold temps much better than hot weather and can die at 100 degrees. In summer in most of the US, good shade and breeze are necessities, plus of course a dependable supply of water that is out of the sun. Even farther north these things become issues in the summer.
People often find that purchasing a new or used shed and modifying it slightly is much more satisfactory than these prebuilt coops, which are often not very sturdy and last only a few years, if that. I will give you a few links to give you some ideas. They generally wind up using their original small coop for a broody pen, a brooder, housing for a sick chicken, etc. Another source is Craig's list.
Also, especially if you live far north, check out the first two links in my signature line for two excellent articles written by a Canadian member. (You can add your location so that it will show under your member name by going to "my profile" and typing it into the location box.)
https://www.backyardchickens.com/t/163417/please-show-me-your-hot-weather-coops
https://www.backyardchickens.com/a/how-much-room-do-chickens-need