How do you say door is open here in farsi?

The literal translation of "the door is open" in Farsi is:

در باز است (Dar baz ast)

Here's a breakdown:

* در (Dar) - Door

* باز (Baz) - Open

* است (Ast) - Is

This is the most common and formal way to say it. You could also say:

* در بازه (Dar baze) - This is more informal and casual.

Both phrases are correct and widely understood.