Bringing coop up to snuff, vents and roosting bar

[Cobber]

Working on our hand me down coop.

No vents. Is one wall-mounted 4 inch vent leeward side above the roosting bar sufficient?

Should I seal up the gaps between the coop and the egg box? It seems like this was built with cracks instead of vents.

Coop came with basically a 1x1 roosting bar. I think even not suitable for cockatiels, tbh. Will be switching that out for a 2 to 4 inch wide board.

I guess the chickens that previously lived in this were pretty tough birds!

I think they prefer this perch ->

 

[Buffbrahmabantam]

That coop is tiny. Chickens need a lot more room than that to be anywhere near happy and healthy. Do they roam during the day? If they roam during the day, could you get the a shed to sleep in at night an lay eggs?

 

[Cobber]

They are out a fair amount during the day and can wander in the (enclosed) yard and forage.
I would agree these commercial coops are way too small.
This one is a TSC featured model, so I would guess there are many ‘in circulation’, not to mention the plethora of similar models sold through Amazon et al.