A mechanics lien is a contractor's security interest in the improved property itself. In South Carolina, the lien statutes (Title 29, Chapter 5 of the SC Code) set strict deadlines: miss one and the lien dies. This post covers who can lien, the two deadline numbers, waivers, and how liens interact with the other payment protections on the exam.
This is an independent study aid, not affiliated with the SC Department of Labor, Licensing and Regulation (LLR), the Contractor's Licensing Board, or PSI. Verify every deadline against the current SC Code text before your test date or before relying on it on a job.
Who may lien
Contractors, subcontractors, and suppliers who furnish labor or materials under contract may lien. Importantly, a direct contract with the owner is not required for subcontractors and suppliers to have lien rights. This is tested: the exam may ask whether a second-tier sub can lien, and the answer is yes if the labor or materials were furnished under contract.
The deadline pair: 90 and 180
Within 90 days after last furnishing labor or materials, you must serve the owner and file the notice (certificate) of lien. Within 180 days after last furnishing, you must begin the action to enforce the lien. Both clocks run from the same starting point: the last date labor or materials were furnished.
Memorize the pair as 90/180 from last furnishing. The common trap is pairing the numbers with the wrong event or confusing the two clocks with each other. The exam also likes to pair these with the Prompt Pay Act clocks (21/7), so keep the two sets separate: 21/7 governs payment timing; 90/180 governs lien perfection and enforcement.
Priority
The lien attaches to the improved property, and priority generally relates back to the date labor or materials were first furnished, ahead of later-recorded mortgages. In plain terms: your lien is treated as if it existed from the day work started, not the day you filed.
Lien waivers: conditional versus unconditional
A conditional waiver is effective on payment: you waive your lien rights if and when the check clears. An unconditional waiver is effective immediately, the moment you sign. Never sign an unconditional waiver before the check clears, because you give up your leverage before you have the money. The exam tests this distinction directly.
Public projects
Liens do not attach to public property. On public projects, the remedy is a stop notice or bond claim against the payment bond, not a mechanics lien. The source material flags that SC public-works bond thresholds should be confirmed from primary sources, so this post will not teach a specific dollar figure. Just know the mechanism: lien for private work, bond claim for public work.
How this fits the exam
Liens are a 3-question content area, but lien facts bleed into Contracts and Agreements and into the prompt-pay material in Estimating and Bidding. The full content map is in the exam overview, and the sample questions include lien-style items.
Try the free practice quiz
Lien deadlines are quick points if you have them cold. Take the free 12-question South Carolina Commercial Business and Law practice quiz, the scored version with email results, so you can see exactly which topics need work. Start the free quiz
The South Carolina Commercial Business Law Study Guide covers liens and all eleven content areas with 150 weighted practice questions.