Mechanic's Lien Deadlines & Notice Requirements in South Dakota

At a glance

Requirements one by one

Governing law

South Dakota's mechanics' lien law is S.D. Codified Laws Title 44, Chapter 9, §§ 44-9-1 to -53, "Mechanics' and Materialmen's Liens." Its core structure dates to a 1913 enactment (SL 1913, ch. 263), and the conditional Notice of Project Commencement / Notice of Furnishing system that changes notice obligations for sub-tier claimants was added much later, in 1999 (SL 1999, ch. 217).

Who can claim

Section 44-9-1 covers anyone who, "at the request of the owner or the duly authorized agent or representative of the owner, or of any contractor or subcontractor," furnishes "skill, labor, services... equipment, or materials" for a covered improvement — language that reaches every tier of the contracting chain, not just claimants who dealt directly with the owner. That work earns "a first lien... prior and superior to all other liens except those of the state or of the United States" and any encumbrance already of record or actually known to the claimant. The chapter covers three distinct categories: building and structure improvements (§ 44-9-1(1)), public utility lines like railways, telephone, or power lines (§ 44-9-1(2)), and mines, mining claims, and oil or gas wells (§ 44-9-1(3)).

Preliminary notice

Most claimants owe no preliminary notice at all. A conditional system applies only if the owner or general contractor chooses to file a "Notice of Project Commencement" with the register of deeds and post a matching location notice naming the contractor at the job site (§§ 44-9-50, 44-9-51). Once both steps have been taken, any sub-subcontractor or supplier to a subcontractor must send a "Notice of Furnishing Labor or Materials" by certified or registered mail to the contractor named in the filed notice, with a copy to the owner, within 60 days of their own last work or last delivery — skip it, and that claimant can't extend a building-type lien at all (§ 44-9-53). The requirement doesn't apply to an individual laborer whose own lien claim is under $2,000.

Deadline to file the lien

Section 44-9-15 sets one flat deadline for everyone: the lien "shall cease" 120 days after the claimant's own last work performed or last item furnished, unless a lien statement is filed by then with the register of deeds (or, for a public-utility-line lien, the secretary of state). That sworn statement must include an itemized account of the claim, the dates of first and last contribution, a description of the property, and the name and address of the owner (§ 44-9-16).

Notice of completion effect

Nothing in Chapter 9's 53 sections gives an owner a way to record a notice of completion, substantial completion, or termination. The 120-day clock always runs from the claimant's own last day of work or last delivery, regardless of the project's actual status.

Serving the lien on the owner

South Dakota puts service before filing rather than after. Section 44-9-17 makes mailing a copy of the lien statement to the owner's last known address — by registered or certified mail — a "condition precedent to filing," and the resulting post office mailing receipt itself has to be physically attached to the lien statement when it's filed. There's no separate post-filing service window because a lien statement filed without that attached receipt isn't a valid filing in the first place.

Deadline to sue to foreclose

Two different clocks can apply. Without any demand from the owner, a claimant has 6 years from the date of the last item of the claim — not from the filing date — to assert the lien "either by complaint or answer" (§ 44-9-24). But if the owner, the owner's agent, or the contractor serves a written demand on the lien holder requiring suit, the lien holder must commence that suit within 30 days of service or the lien is forfeited outright; the owner can then force the register of deeds to cancel the lien by filing an affidavit, a copy of the demand, and proof of service, starting on the 40th day after the demand was served (§ 44-9-26).

Homestead/residential extras

Section 44-9-5 handles residential property differently than most states: rather than adding a special notice or disclosure duty, it simply removes the exempt portion of a homeowner's residence from the lien's reach entirely — "The lien shall not extend to nor affect any rights in any homestead so far as the same is exempt from levy and sale on execution." The protection tracks whatever South Dakota's general homestead exemption from creditors already covers, rather than creating a separate mechanic's-lien- specific residential rule.

What trips people up

The mail-before-you-file sequence catches people who assume South Dakota works like states that let a claimant serve the lien after recording it — here, the county register of deeds is meant to receive a lien statement with the mailing receipt already attached, so a claimant who mails the owner a copy "right after filing" has the order backwards. Second, the conditional notice system under §§ 44-9-50 to -53 only ever applies to sub-subcontractors and suppliers-to-subcontractors, and only once BOTH a Notice of Project Commencement is filed AND a location notice is posted at the job site — checking one without the other isn't enough to know whether the 60-day notice duty has actually been triggered. Third, the 30-day demand-to-sue mechanism under § 44-9-26 can blindside a claimant who is otherwise relying on the general 6-year window: once an owner serves that written demand, the 6 years is irrelevant and the claimant has only 30 days left, or the lien is gone.

Common questions

Do I need to send a notice before I start work in South Dakota? Usually no. The only exception is for a sub-subcontractor or a supplier to a subcontractor on a project where the owner or general contractor has filed a Notice of Project Commencement and posted it at the job site — in that case, you must notify the named contractor within 60 days of your own last work.

When do I mail my lien statement to the owner? Before you file it. South Dakota requires the mailing to happen first, with the post office receipt attached to the statement at the time of filing — not a separate step you take after the lien is already on record.

How long do I have to sue to enforce my lien? Generally 6 years from the date of your last item of work or materials. But if the owner serves you a written demand to sue, that window shrinks to just 30 days from the date you're served.

Can a lien attach to someone's home in South Dakota? Not to the extent that home qualifies as an exempt homestead under state law — § 44-9-5 keeps that exempt interest out of the lien's reach entirely, separate from anything about notice or filing procedure.

Requirements one by one

Covered work and conditional notice

Section 44-9-1 covers work supplied at the request of the owner, an authorized agent, or a contractor or subcontractor. Building improvements, utility lines, and mines have separate property descriptions under that section. For building-type claims, § 44-9-50 and § 44-9-51 allow a person dealing directly with the owner to file a notice of project commencement within 30 days of work starting and require the filer to post the contractor's name and a location notice at the job site.

When those two provisions are invoked, § 44-9-53 requires a sub-subcontractor or supplier to a subcontractor to mail a notice of furnishing to the named contractor by certified or registered mail, with a copy to the owner. The deadline is 60 days after that claimant's last work or material; the postal receipt must accompany the lien filing. Without the notice, that claimant cannot extend the building lien under § 44-9-15. An individual laborer's claim under $2,000 is excepted.

Filing and owner mailing

Section 44-9-15 says the lien "shall cease" 120 days after the claimant's last work or item furnished unless a statement is filed. The verified statement must identify the amount claimed, first and last contribution dates, property, owner, and itemized account (§ 44-9-16). Section 44-9-17 requires the claimant to mail a copy to the owner by certified or registered mail before filing and to attach the postal receipt to the filed statement. A utility-line lien under § 44-9-1(2) is filed with the secretary of state; building claims go to the county register of deeds.

Enforcement and homestead

Section 44-9-24 permits assertion of the lien by complaint or answer within six years from the last item of the claim. Under § 44-9-26, a written demand served by the owner, the owner's agent, or the contractor requires suit within 30 days; otherwise the lien is forfeited. The register of deeds may cancel it on the stated affidavit and service proof no earlier than the fortieth day after the demand.

Section 44-9-5 excludes rights in a homestead only "so far as the same is exempt from levy and sale on execution." The exclusion is limited by the homestead exemption's own reach.

What trips people up

The project-commencement notice triggers a lower-tier furnishing notice; it is not an owner notice of completion that cuts the filing time. Chapter 9 measures the filing period from the claimant's last contribution (§ 44-9-15). The postal receipt for owner mailing must be attached when the lien statement is filed (§ 44-9-17); mailing afterward does not meet that sequence.

Common questions

Does the 60-day furnishing notice require proof of mailing? Yes. Section 44-9-53 requires the postal receipt to be attached to the lien when it is filed.

May I assert the lien in a suit someone else filed? Section 44-9-24 permits assertion by answer as well as by complaint, within its six-year period unless a shorter demand deadline applies.

Statutes and sources

• S.D. Codified Laws § 44-9-1 (persons entitled to lien) — https://sdlegislature.gov/api/Statutes/44-9-1.html (accessed 2026-10-06)
• S.D. Codified Laws § 44-9-5 (homestead right not affected) — https://sdlegislature.gov/api/Statutes/44-9-5.html (accessed 2026-10-06)
• S.D. Codified Laws § 44-9-15 (120-day filing deadline) — https://sdlegislature.gov/api/Statutes/44-9-15.html (accessed 2026-10-06)
• S.D. Codified Laws § 44-9-16 (lien statement contents) — https://sdlegislature.gov/api/Statutes/44-9-16.html (accessed 2026-10-06)
• S.D. Codified Laws § 44-9-17 (mailing to owner a condition precedent to filing) — https://sdlegislature.gov/api/Statutes/44-9-17.html (accessed 2026-10-06)
• S.D. Codified Laws § 44-9-24 (six-year limitation to enforce lien) — https://sdlegislature.gov/api/Statutes/44-9-24.html (accessed 2026-10-06)
• S.D. Codified Laws § 44-9-26 (forfeiture for failure to sue upon demand) — https://sdlegislature.gov/api/Statutes/44-9-26.html (accessed 2026-10-06)
• S.D. Codified Laws § 44-9-50 (notice of project commencement) — https://sdlegislature.gov/api/Statutes/44-9-50.html (accessed 2026-10-06)
• S.D. Codified Laws § 44-9-51 (location notice posted at job site) — https://sdlegislature.gov/api/Statutes/44-9-51.html (accessed 2026-10-06)
• S.D. Codified Laws § 44-9-53 (notice of furnishing required before a sub-tier lien is available) — https://sdlegislature.gov/api/Statutes/44-9-53.html (accessed 2026-10-06)