Old fence panels

[KyCoop]

They will be great to use. I used fence panels as well but I used new ones. I put furring strips to cover the gaps that were left when they shrunk after I put them on. You can also use 2×3 's to cut down a little on your framing costs.

 

[Matejka]

Pallets are good use also.

 

[STACEYH]

I saw this and thought it could help. https://www.instructables.com/Weekend-Backyard-Chicken-Coop/