For subs and suppliers, the only effect the notice of commencement has with respect to lien rights is the effect it has on the ability to post the required preliminary notice, as defined above. The notice of commencement has no impact on lien rights themselves.
In Iowa, anyone furnishing labor or materials to a construction project has a right to file a mechanics lien if they are unpaid, provided the associated requirements are met. This underlying right, is not affected by the filing (or non-filing) of a Iowa notice of commencement.