Illinois: Mechanic's Lien Deadlines & Notice Requirements

The short answer

Illinois's Mechanics Lien Act dates to 1903 and still carries a filing
deadline that splits depending on who you're trying to beat. Record the
lien claim within 4 months of your last day of work and it beats later
purchasers, mortgage lenders, and other creditors of the property. Miss
that window, and you can still record the same claim — good only against
the original owner — any time up to 2 years after completion. There's no
notice requirement before or during the work itself. A subcontractor still
has to send the owner written notice of the claim within 90 days after
finishing, and if the job is an owner-occupied single-family residence, a
separate 60-day notice to the occupant as well. From there, a lawsuit to
enforce the lien has to start within 2 years of completion, unless someone
serves a formal demand that cuts it to 30 days.

Requirements one by one

Governing law

Illinois's private-works lien statute is the Mechanics Lien Act, 770 ILCS
60/0.01 and following, whose short-title section simply says "This Act may
be cited as the Mechanics Lien Act." It has been amended piecemeal for over
a century rather than rewritten wholesale — the numbering still runs
0.01, 1, 5, 7, 9... rather than a clean sequential scheme.

Who can claim

Section 1(a) defines a "contractor" as anyone who improves an owner's
property "by any contract or contracts, express or implied," directly with
the owner. Section 21(a) then defines "subcontractor" broadly: "every
mechanic, worker, or other person who shall furnish any labor, services,
material, fixtures, apparatus or machinery... for the contractor." Illinois
doesn't cap lien rights at a fixed contractual tier the way some states do
— the statute's plain language reaches anyone furnishing labor or material
"for the contractor," without limiting it to a direct or second-tier
relationship.

Preliminary notice

Illinois has no notice requirement before or during work on most projects.
The one exception is narrow: on an "existing owner-occupied single family
residence," a subcontractor must notify the occupant, in writing, within
60 days of first furnishing labor or material, "in order to preserve the
subcontractor's lien." Even here the consequence of missing the deadline is
softer than an outright forfeiture — late notice "shall preserve the
subcontractor's lien, but only to the extent that the owner has not been
prejudiced by payments made prior to receipt of the notice."

Deadline to file the lien

Beyond the recording deadline (below), every subcontractor separately has
to serve the owner of record (and the lender, if known) written notice of
the claim and amount due within 90 days after completing their own work.
Section 24(a) requires this "written notice of his or her claim" so that
the subcontractor's lien binds the owner — a sworn statement from the
contractor under Section 5 can substitute for it if it already discloses
the same information accurately.

Notice of completion effect

There is no owner-filed notice of completion, termination, or cessation
anywhere in the Act. The only event that starts any clock — the 90-day
notice, the 4-month recording window, the 2-year owner-only window, or the
2-year suit deadline — is the claimant's own last day of furnishing labor
or material.

Serving the lien on the owner

Illinois has no across-the-board requirement to serve a copy of the
recorded lien on the owner. The one carve-out applies only to a contractor
(not a subcontractor) on an owner-occupied single-family residence: written
notice is due "within 10 days after recording a lien," and the penalty for
missing it is capped — "the lien is extinguished to the extent of the
damages" the owner actually suffered before getting notice, not an
automatic forfeiture; the statute is explicit that "the mere recording of
the lien claim is not considered damages."

Deadline to sue to foreclose

Suit to enforce the lien "shall be commenced... within two years after the
completion of the contract." Section 34 lets anyone with an interest in
the property — the owner, another lienholder, even the county recorder in
some cases — force an earlier deadline by serving a written demand; the
lienholder then has 30 days to sue or answer, "or the lien shall be
forfeited."

Homestead/residential extras

An owner-occupied single-family residence carries three separate
formalities layered onto the ordinary process. First, before paying the
contractor at all, the owner must obtain a sworn statement listing every
subcontractor and amount owed, and the contractor must first hand the
owner a specific boldface warning that this statement is required by law.
Second, each subcontractor must independently notify the occupant within
60 days of first furnishing labor or material, on top of the general
90-day notice to the owner every subcontractor already has to send.
Third, a contractor recording a lien on such a residence must notify the
owner within 10 days of recording — a duty that doesn't exist for
contractors on any other type of property.

What trips people up

The 4-month/2-year split is easy to misread as an either-or choice rather
than a stacked safety net: recording after 4 months doesn't kill the lien,
it only means later purchasers and mortgage lenders can take free of it,
while the original owner is still bound up to the 2-year mark. People also
conflate the two residential notices — the 90-day notice to the owner that
every subcontractor must send on any project, and the separate 60-day
notice to the occupant that only applies when the property is an
owner-occupied single-family home. Missing the 60-day residential notice
is more forgiving than it looks, since it only costs the subcontractor
whatever the owner already paid out before the late notice arrived.

Common questions

Do I have to send any notice before I start work in Illinois?
No. Illinois has no pre-work notice requirement on any project. The
earliest notice obligation — the 60-day occupant notice — only applies on
an owner-occupied single-family residence, and even then it's measured
from first furnishing, not from before work begins.

What's the difference between recording within 4 months and within 2
years?
Recording within 4 months protects the lien against later purchasers,
mortgage lenders, and other creditors of the property. Recording between 4
months and 2 years after completion still creates a valid lien, but only
enforceable against the original owner — not against anyone who later
bought the property or lent against it in the meantime.

Can the owner force me to sue faster than the 2-year deadline?
Yes. Anyone with an interest in the property can serve a written demand
requiring suit to be filed; the lienholder then has only 30 days to sue or
answer before the lien is automatically forfeited.

Statutes and sources

• 770 ILCS 60/0.01 (short title) —
  http://www.ilga.gov/legislation/ilcs/fulltext.asp?DocName=077000600K0.01
  (accessed 2026-07-04)
• 770 ILCS 60/1(a) (contractor defined) —
  http://www.ilga.gov/legislation/ilcs/fulltext.asp?DocName=077000600K1
  (accessed 2026-07-04)
• 770 ILCS 60/5(a)-(b) (sworn statement and boldface notice) —
  http://www.ilga.gov/legislation/ilcs/fulltext.asp?DocName=077000600K5
  (accessed 2026-07-04)
• 770 ILCS 60/7(a) (4-month/2-year recording deadlines) —
  http://www.ilga.gov/legislation/ilcs/fulltext.asp?DocName=077000600K7
  (accessed 2026-07-04)
• 770 ILCS 60/7(d) (contractor's 10-day post-recording notice, residential) —
  http://www.ilga.gov/legislation/ilcs/fulltext.asp?DocName=077000600K7
  (accessed 2026-07-04)
• 770 ILCS 60/9 (2-year deadline to sue) —
  http://www.ilga.gov/legislation/ilcs/fulltext.asp?DocName=077000600K9
  (accessed 2026-07-04)
• 770 ILCS 60/21(a) (subcontractor defined) —
  http://www.ilga.gov/legislation/ilcs/fulltext.asp?DocName=077000600K21
  (accessed 2026-07-04)
• 770 ILCS 60/21(c) (60-day occupant notice, owner-occupied residence) —
  http://www.ilga.gov/legislation/ilcs/fulltext.asp?DocName=077000600K21
  (accessed 2026-07-04)
• 770 ILCS 60/24(a) (90-day subcontractor notice of claim) —
  http://www.ilga.gov/legislation/ilcs/fulltext.asp?DocName=077000600K24
  (accessed 2026-07-04)
• 770 ILCS 60/34(a) (30-day demand to sue) —
  http://www.ilga.gov/legislation/ilcs/fulltext.asp?DocName=077000600K34
  (accessed 2026-07-04)