My initial thought today was to get some type of small coop and then set it next to my existing coop/run. Then I could build a temporary run using one of the existing walls of my current run. Then I got to thinking that this would be good to integrate them but they would be too close to each other to be considered quarantined, as that right. Or as long as they cannot contact each other physically and are not sharing feed/water is that enough to keep them safe from health issues they might have?
I agree with Ridgerunner and Aart.
True quarantine for medical illness requires separate, isolated pens out of sight, out of wind draft, out of dander float, no shared ground or fence or food or water (that you carry too!).
It is impossible to do any kind of real medical quarantine in a backyard as most simply don't have the space or facilities. You can create an environment that does approximate a reasonable attempt at quarantine.
I approximate an isolation quarantine with a quarantine cage on the side of the house that has separate access from the house. I use boots and coat hanging by that door for that cage only. Those birds have separate feed and water bowls carried directly to that cage area and left there. I do not carry feed or water between my flock and those birds. There is no shared fence space nor ground space. I have a tall heavy fence between that side of the house and the back yard...but technically, air flow still could go around....but it is the best I can do, and should generally cut down on close contact disease transmissions such as MG, lice, mites, coccidia, but viruses can still carry in the wind. Hopefully the heavy fence reduces that.
If you want to purchase started birds, it is a risk. You have to weigh how much you want those started birds with how much you want to risk the head ache of addressing a disease in your flock.
I have purchased started pullets and have had no issues. I have also had a bird bring in Infectious Bronchitis that passed to my whole flock causing me to lose 2 birds and weeks of egg production. (That was before I kept stricter isolation quarantine).
Isolation helps prevent flock wide mite and lice infection, which is a big pain to treat if you have to treat the whole flock.
So I am with the camp that says if you purchase started birds, purchase from a reliable source and quarantine for 4 weeks.
But the best thing is to purchase day old chicks or hatch eggs.
LofMc