A written notice from a sub or supplier to the property owner saying they're working on the project and intend to protect their right to get paid.
A notice to owner (NTO) is a document sent by a subcontractor, sub-subcontractor, or material supplier to the property owner and general contractor informing them that the sender is performing work or furnishing materials to the project and intends to preserve its lien rights. Many states require subcontractors below the first tier to serve an NTO within a statutory deadline (often 45 days from first furnishing) as a prerequisite to filing a valid mechanic's lien. The NTO alerts the owner so they can ensure funds reach lower-tier parties.
An NTO is a payment-security mechanism, not a bidding document, but estimators on the sub side must budget the administrative time and tracking to serve it correctly on every qualifying job. Missing the statutory deadline can void lien rights entirely, turning a routine collection into an unsecured debt and exposing thin margins to nonpayment risk. On the GC and owner side, receiving NTOs signals which lower-tier parties are on the job and informs lien-waiver tracking before releasing progress payments.
A drywall subcontractor's office manager serves a Notice to Owner within 40 days of delivering the first load of board to a strip-mall job, preserving the company's lien rights even though it contracts only with the GC and never deals with the owner directly.
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