Arizona's 20-Day Preliminary Notice under A.R.S. § 33-992.01 is unique in that EVERYONE on a private construction project — including the direct contractor — must serve it. The notice goes to the owner, the original contractor, and the construction lender within 20 days of first furnishing. Everyone in the construction chain on a private Arizona project — direct contractors, subcontractors, material suppliers, equipment lessors, and design professionals — must serve a 20-Day Preliminary Notice to preserve lien rights. Within 20 days of first furnishing labor, materials, or professional services. Late notices only protect labor or materials furnished in the 20 days before service.
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