South Dakota: Mechanic's Lien Deadlines & Notice Requirements

The short answer

South Dakota doesn't require most claimants to send any notice before or
during work. A conditional exception kicks in only if the owner or general
contractor voluntarily files a Notice of Project Commencement and posts it
at the job site: once that happens, any sub-subcontractor or supplier to a
subcontractor must notify the named contractor within 60 days of their own
last work, or they can't claim a lien for that project at all. Every
claimant, regardless of tier, must file a sworn lien statement within 120
days of their own last labor or materials furnished — but only after first
mailing a copy to the owner and attaching the post office receipt to the
filed statement, a mailing-before-filing sequence rather than the more
common serve-after-recording pattern. Once filed, a lien can normally be
enforced for up to 6 years, but an owner who serves a written demand to sue
can cut that all the way down to 30 days. A homeowner's exempt homestead
interest is untouchable by the lien in the first place, to the same extent
it's already protected from ordinary creditors.

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.

Statutes and sources

• S.D. Codified Laws § 44-9-1 (persons entitled to lien) —
  https://sdlegislature.gov/api/Statutes/44-9-1.html
  (accessed 2026-07-05)
• S.D. Codified Laws § 44-9-5 (homestead right not affected) —
  https://sdlegislature.gov/api/Statutes/44-9-5.html
  (accessed 2026-07-05)
• S.D. Codified Laws § 44-9-15 (120-day filing deadline) —
  https://sdlegislature.gov/api/Statutes/44-9-15.html
  (accessed 2026-07-05)
• S.D. Codified Laws § 44-9-16 (lien statement contents) —
  https://sdlegislature.gov/api/Statutes/44-9-16.html
  (accessed 2026-07-05)
• 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 2026-07-05)
• S.D. Codified Laws § 44-9-24 (six-year limitation to enforce lien) —
  https://sdlegislature.gov/api/Statutes/44-9-24.html
  (accessed 2026-07-05)
• S.D. Codified Laws § 44-9-26 (forfeiture for failure to sue upon demand) —
  https://sdlegislature.gov/api/Statutes/44-9-26.html
  (accessed 2026-07-05)
• S.D. Codified Laws § 44-9-50 (notice of project commencement) —
  https://sdlegislature.gov/api/Statutes/44-9-50.html
  (accessed 2026-07-05)
• S.D. Codified Laws § 44-9-51 (location notice posted at job site) —
  https://sdlegislature.gov/api/Statutes/44-9-51.html
  (accessed 2026-07-05)
• 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 2026-07-05)