A legal document filed by the property owner at project start that establishes the timeline and identifies parties for mechanics lien purposes.
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In the Field
In states requiring it (Florida, Georgia, others), subs and suppliers must serve a preliminary notice within a specific window after the NOC is filed to preserve lien rights. Missing the deadline can waive your lien rights entirely.
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Rule of Thumb
As a sub or supplier, request a copy of the NOC at project start and serve your preliminary notice within the required window — usually 45 days of first furnishing.