Iowa Code § 572.26: Kinds of action — amendment.

1. An action to enforce a mechanic’s lien shall be by equitable proceedings, and no other cause of action shall be joined therewith.

2. a. Except as provided in paragraph “b”, a claimant may only amend a lien statement by leave of court in furtherance of justice.

b. A claimant may amend a lien statement without leave of court to decrease the amount demanded, and such amendment shall be effected through the mechanics’ notice and lien registry. Amendment of a lien statement pursuant to this paragraph shall not change or otherwise affect its priority.

c. A claimant shall not amend a lien statement to increase the amount demanded.