The short answer
The fee is negotiable; the scope behind it is what should be negotiated, because a discount usually removes a service.
Practices price for time, risk and liability, so a lower fee almost always means a narrower scope — fewer site visits, fewer revisions, or drawings that stop at approval stage.
It is fairer to negotiate the scope: drop optional services you do not need, phase the work, or reduce the drawing set, rather than pressing for a discount on the same deliverable list. Put the final scope and fee in writing.
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