Welcome!
This site is chock full of information and experienced chicken keepers. Take advantage of all the learning available here! I don't think I'd still be raising my chickens if it wasn't for the education I've gotten here. I've made TONS of mistakes because of not knowing what I don't know. One thing I've come to realize is that my mistakes can be turned around and turned to positive. I just need to ask for information and do some research here.
One of my first and biggest mistakes was purchasing a prefab coop. I knew that chickens require 4sqft per bird in their house and 10sqft/bird in their run. I did good making a 100sqft run for my 7 birds. I bought a coop with total 25sqft. That seems perfect for 6.25 birds. Ok, I was .75 birds over the reccomended limit.
Wrong. I was 5 birds over the limit! The coop had a built in run connected to the henhouse that was included in the calculation. I learned that the henhouse is the only part that should be measured as coop. Manufacturers rated it for 8 chickens. The actual coop is 8sqft, enough for 2 chickens! But wait, there's more! When calculating coop area the nesting section is not included! Coop area means floor space without nesting space. I now realised I had 3.5sqft of coop space. That's 1, count em, ONE chicken! What to do, what to do! Oh, and I haven't even touched on the poor quality of the coop. Drafty gaps, wood that rots in a year, etc.
I've told you of my mess because I fear you have made the same mistake. Don't panic! Just start taking steps to remedy this. First start looking at how to build a coop. Lots of info here. Best advice, build bigger than you think you'll need. Second, don't trash that tiny coop. It will be perfect as an emergency coop. If a chicken is sick or injured you'll need to remove it from the flock. Just make some adaptations for those drafts and such. Third...uh oh you won't get that coop built in time? My solution for this was to enclose the entire prefab unit with plywood making it all coop, no run. I already had a good size run, didn't need the attached run.
Research before you start. Ventilation, roost height, windows. All the answers are here. You are about to begin a fun adventure.
I'll get off this soapbox now. 
Edit: If you don't ever get more than 3 birds (not easy to do, chicken math) you MAY be able to use your prefab once it's adapted by enclosing it as long as you have 12sqft not including the nesting space.
This site is chock full of information and experienced chicken keepers. Take advantage of all the learning available here! I don't think I'd still be raising my chickens if it wasn't for the education I've gotten here. I've made TONS of mistakes because of not knowing what I don't know. One thing I've come to realize is that my mistakes can be turned around and turned to positive. I just need to ask for information and do some research here.One of my first and biggest mistakes was purchasing a prefab coop. I knew that chickens require 4sqft per bird in their house and 10sqft/bird in their run. I did good making a 100sqft run for my 7 birds. I bought a coop with total 25sqft. That seems perfect for 6.25 birds. Ok, I was .75 birds over the reccomended limit.
Wrong. I was 5 birds over the limit! The coop had a built in run connected to the henhouse that was included in the calculation. I learned that the henhouse is the only part that should be measured as coop. Manufacturers rated it for 8 chickens. The actual coop is 8sqft, enough for 2 chickens! But wait, there's more! When calculating coop area the nesting section is not included! Coop area means floor space without nesting space. I now realised I had 3.5sqft of coop space. That's 1, count em, ONE chicken! What to do, what to do! Oh, and I haven't even touched on the poor quality of the coop. Drafty gaps, wood that rots in a year, etc.
I've told you of my mess because I fear you have made the same mistake. Don't panic! Just start taking steps to remedy this. First start looking at how to build a coop. Lots of info here. Best advice, build bigger than you think you'll need. Second, don't trash that tiny coop. It will be perfect as an emergency coop. If a chicken is sick or injured you'll need to remove it from the flock. Just make some adaptations for those drafts and such. Third...uh oh you won't get that coop built in time? My solution for this was to enclose the entire prefab unit with plywood making it all coop, no run. I already had a good size run, didn't need the attached run.
Research before you start. Ventilation, roost height, windows. All the answers are here. You are about to begin a fun adventure.
I'll get off this soapbox now. Edit: If you don't ever get more than 3 birds (not easy to do, chicken math) you MAY be able to use your prefab once it's adapted by enclosing it as long as you have 12sqft not including the nesting space.
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and Welcome to Backyard Chickens.
