Wisconsin: Mechanic's Lien Deadlines & Notice Requirements
The short answer
Wisconsin calls this a construction lien, and it runs on three separate notices before you ever get to court. Depending on your role, you may owe the owner a lien-rights notice within 10 or 60 days of starting work; you must then serve a 30-day notice of intent before filing; and you must file the claim itself within 6 months of your own last work or delivery. Once filed, you have 2 years to sue to enforce it. Smaller residential projects get more notice protection than larger or commercial ones, not less.
| Governing law | Wis. Stat. ch. 779, Subch. I, the "construction lien law" (§§ 779.01-.17); a single continuously amended chapter, not a Uniform Act |
|---|---|
| Who can claim a lien | Any person who performs, furnishes, or procures work, labor, services, materials, plans, or specifications for an improvement, at any tier, so long as any notice required by § 779.02 is given; "prime contractor" includes an architect, engineer, construction manager, or surveyor hired directly by the owner, and an owner who acts as their own prime contractor (§ 779.01(2)-(3)) |
| Preliminary notice | A prime contractor must include a lien-rights notice in its written contract with the owner, or serve one within 10 days of first furnishing if there's no written contract; every other claimant must serve the owner a written notice within 60 days of first furnishing, losing lien rights only for work done before a late notice goes out; neither notice is required on a project adding more than 4 residential units or one that's partly or wholly nonresidential (§ 779.02(1)-(2)) |
| Deadline to file the lien | 6 months after the claimant's own last labor, services, or materials furnished, to file a claim for lien with the clerk of circuit court — but only after first serving the separate 30-day notice of intent to file described below; skip either step and "no lien... shall exist" (§ 779.06(1)-(2)) |
| Notice of completion effect | None — Chapter 779 has no owner-recorded notice of completion or cessation; the 6-month filing clock runs from the claimant's own last furnishing regardless of anything the owner files |
| Serving the lien on the owner | A copy of the filed claim for lien must be served on the owner within 30 days after filing (§ 779.06(1)) — a separate, later step from the 30-day notice of intent to file that must precede the filing itself (§ 779.06(2)) |
| Deadline to sue to foreclose | 2 years from the date the claim for lien is filed to bring an action (summons and complaint filed) to enforce it, or the lien is unenforceable (§ 779.06(1)) |
| Homestead/residential extras | Wisconsin runs this backward from most states: its notice requirements exist specifically to protect smaller residential owners. Both preliminary notices under § 779.02 apply to a project adding 4 or fewer residential units, but neither is required at all once a project adds more than 4 units (if wholly residential) or is partly or wholly nonresidential (§ 779.02(1)(c)) |
Compare this rule across all 50 states + DC →
The short answer
Wisconsin calls its version of this remedy a "construction lien," and its
distinguishing feature is that it runs on three separate, differently
timed notices rather than one preliminary notice and one filing. Depending
on your role, you may owe the owner an early lien-rights notice within 10
or 60 days of first showing up on the job. Later, you must serve a separate
30-day notice of intent to file before you can file the lien claim itself,
which must happen within 6 months of your own last work or delivery. Once
filed, you have 2 years to bring a foreclosure lawsuit. Unusually, the
early notices only apply to smaller residential projects — larger
residential and commercial work is exempt from them entirely.
Requirements one by one
Governing law
Wisconsin's construction lien law is Chapter 779, Subchapter I of the
Wisconsin Statutes (§§ 779.01 to 779.17) — the same chapter also covers log
liens, mining liens, and several other specialized liens in later
subchapters, but Subchapter I is self-contained for private construction
work. It is a Wisconsin-drafted chapter, not built on any national uniform
act, and has been amended piecemeal over decades.
Who can claim
Section 779.01(3) gives lien rights broadly: "any person who performs,
furnishes, or procures any work, labor, service, materials, plans, or
specifications ... used or consumed for the improvement of land" qualifies,
provided the required notice under § 779.02 is given. Section 779.01(2)(d)
defines "prime contractor" to include not just a general contractor but
also "an architect, professional engineer, construction manager, surveyor,
or other service provider" who contracts directly with the owner, plus an
owner who personally acts as their own prime contractor. Every other
claimant, regardless of tier, is defined by exclusion — anyone who isn't
the prime contractor.
Preliminary notice
Wisconsin splits this by role. Section 779.02(2)(a) requires a prime
contractor to build the required lien-rights notice into its written
contract with the owner, or — if there's no written contract — to serve it
separately "within 10 days after the first labor, services, materials,
plans, or specifications are performed, furnished, or procured." Section
779.02(2)(b) requires every other claimant to serve the owner a written
notice "within 60 days after performing, furnishing, or procuring the
first labor, services, materials, plans, or specifications," on pain of
losing lien rights — though only for work done before a late notice goes
out, not the whole claim. Crucially, § 779.02(1)(c) exempts an entire
category of projects from both notices: any improvement "where more than 4
family living units are to be provided or added ..., if the improvement is
wholly residential in character, or in any case where the improvement is
partly or wholly nonresidential in character." Laborers and mechanics, and
anyone contracting directly with the owner (other than the prime
contractor itself), are separately exempt under § 779.02(1)(a)-(b).
Deadline to file the lien
Section 779.06(1) is direct: "No lien under s. 779.01 shall exist ... unless
within 6 months from the date the lien claimant performed, furnished, or
procured the last labor, services, materials, plans, or specifications, a
claim for the lien is filed." But filing isn't the first step available —
§ 779.06(2) requires a separate 30-day notice of intent to file before the
claim can be filed at all (see below), so the practical window to act is
narrower than 6 months once that notice period is worked backward from the
deadline.
Notice of completion effect
Nothing in Chapter 779 lets an owner record a notice of completion or
cessation to shorten any deadline here. The 6-month filing clock in
§ 779.06(1) runs strictly from the claimant's own last day of furnishing,
regardless of when the overall project finishes or what the owner records.
Serving the lien on the owner
Once the claim for lien is filed, § 779.06(1) requires the claimant to
"serve a copy of the claim for lien on the owner of the property on which
the lien is placed within 30 days after filing the claim." This is
separate from, and comes after, the pre-filing notice of intent described
next — Wisconsin requires notice both before filing (a warning) and after
filing (proof the lien now exists).
Deadline to sue to foreclose
Section 779.06(1) also sets the foreclosure clock: "unless within 2 years
from the date of filing a claim for lien an action is brought and summons
and complaint filed," the claim doesn't ripen into an enforceable lien
foreclosure. Section 779.09 then routes the foreclosure procedure itself
into the general chapter on foreclosure actions: "ch. 846 shall control as
far as applicable," and every claimant who filed a lien on the same
property may join as a plaintiff or be named a defendant.
Homestead/residential extras
Wisconsin's residential rule runs opposite to the pattern in most other
states: instead of adding extra protection to residential property, its
preliminary-notice requirements exist specifically because a project is
small and residential. Section 779.02(1)(c) exempts an improvement from
both the prime contractor's and every other claimant's preliminary notice
once the project adds "more than 4 family living units" (if wholly
residential) or is "partly or wholly nonresidential in character." Put
plainly: a duplex or single-family remodel gets the preliminary-notice
protections; a 5-unit apartment building or a commercial project does not.
The later 30-day notice of intent to file under § 779.06(2), and the
6-month filing and 2-year foreclosure deadlines, apply the same way to
every project regardless of size or use.
What trips people up
Because Wisconsin requires a notice before the notice of intent to file,
and then a separate service step after filing, it's easy to satisfy one
notice requirement and miss another. A claimant who properly serves the
60-day notice under § 779.02(2)(b) can still lose lien rights entirely by
skipping the later, independent 30-day notice of intent to file under
§ 779.06(2) — the statute requires that notice "whether or not the
claimant has been required to and has given a previous notice pursuant to
s. 779.02." Working backward from the 6-month filing deadline to leave
room for a full 30-day notice period is a common scheduling trap.
Common questions
If my project only has 3 residential units, do I still need to send an
early notice?
Yes. The § 779.02(1)(c) exemption only kicks in once a project adds more
than 4 residential units (or is partly/wholly nonresidential); a smaller
residential project still requires the standard 10-day or 60-day notice
depending on your role.
Does sending my 60-day preliminary notice cover the later notice-of-intent
requirement too?
No. Section 779.06(2) requires the 30-day notice of intent to file
regardless of whether an earlier § 779.02 notice was given — they're
independent requirements.
What happens if I file my lien but never serve a copy on the owner?
Section 779.06(1) requires that service within 30 days after filing; the
statute makes both the filing and this later service part of the same
sentence establishing when a lien exists.
Statutes and sources
- Wis. Stat. § 779.01(2) (definitions: improvement, lien claimant, owner,
prime contractor) —
https://docs.legis.wisconsin.gov/document/statutes/779.01
(accessed 2026-07-04) - Wis. Stat. § 779.01(3) (extent and character of lien) —
https://docs.legis.wisconsin.gov/document/statutes/779.01
(accessed 2026-07-04) - Wis. Stat. § 779.02(1) (exceptions to the notice requirement) —
https://docs.legis.wisconsin.gov/document/statutes/779.02?view=section
(accessed 2026-07-04) - Wis. Stat. § 779.02(2) (prime contractor and other-claimant notice) —
https://docs.legis.wisconsin.gov/document/statutes/779.02?view=section
(accessed 2026-07-04) - Wis. Stat. § 779.06(1) (6-month filing deadline; service on owner;
2-year foreclosure deadline) —
https://docs.legis.wisconsin.gov/document/statutes/779.06?view=section
(accessed 2026-07-04) - Wis. Stat. § 779.06(2) (30-day notice of intent to file) —
https://docs.legis.wisconsin.gov/document/statutes/779.06?view=section
(accessed 2026-07-04) - Wis. Stat. § 779.06(3) (contents of the claim for lien) —
https://docs.legis.wisconsin.gov/document/statutes/779.06?view=section
(accessed 2026-07-04) - Wis. Stat. § 779.09 (foreclosure procedure and parties) —
https://docs.legis.wisconsin.gov/document/statutes/779.09
(accessed 2026-07-04)
Source links
Every statute quoted above, linked, with the date we checked it.