Under the SC lien laws, you would have had to have sent them a notice of lien within 90 days of the last materials furnished. Once you send them a notice of lien and a verified statement of account of the debt, then you can file the lien with the recorder of deeds where they are located. As a company, this would need to be done by an attorney representing your company.
If you have missed the 90 day limit, which is strictly adhered to in SC, then your only option to preserve the claim is to file suit or seek collateral
from the company to secure your debt and file a UCC-1 secured debt statement with the Secretary of State to perfect your security interest in the collateral the debtor is granting you an interest in.
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