Some Architects charge by the SF (Square Foot of the house interior).
Averages seen may vary between $30 to $50/SF.
Let’s see what that means:
2,200 HSF house x $30 = $66,000 Architect’s Fee.
2,200 HSF house x $38= $83,600 Architect’s Fee.
2,200 HSF house x $50= $110,000 Architect’s Fee.
So, this method can have varying results.