I need to build a walk-in 15 x 20 chicken run with treated wood - where do I begin!?

[wmcdow]

Are there any 15 x 20 plans on here? My chicken coop will be inside this run that I need to build. Thanks!

 

[btruegs]

I don't know of any exact plans, but you could probably find pictures to give you ideas. Here is some almost the same size:
https://www.backyardchickens.com/t/616737/covered-runs-anyone-post-pics-please/10

 

[Percheron chick]

A coop of those dimensions is going to require more engineering and more expensive lumber than if you cut it down to 10 or 12 feet wide. I would probably build it 10x20 with a 5 foot overhang. You could enclose that as a sun room for a place for them to hang outside in bad weather.