This stuff would take years to dry. and I am building a house and are
getting tired of using the ladder inside.
I could get it kiln dried but it is very expensive.

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If the pine is the usual modern quick-grown stuff I think I would wait
for the timber to dry at least to the ambient humidity where you intend
to build the staircase. Unless you want a spiral staircase that is!
Or is there a timber yard where you could have it kiln-dried?
Just my tuppence.
Charles