Preliminary notices in Iowa
Iowa is one of the states with no general preliminary notice for subcontractors on commercial work in our summary. That doesn't mean you can skip paperwork: the lien itself still has a hard deadline, and the other notices below still apply.
Residential work adds a step: subcontractors and suppliers give a residential notice on the state lien registry within 10 days after your first day furnishing labor or materials. It is required only in some cases. Residential work only, posted to the Mechanics' Notice and Lien Registry. Verify the details with the statute.
Lien filing deadline in Iowa
If the GC hired you, you have 90 days after your last day furnishing labor or materials to record a mechanics lien in Iowa, about the same as the national median of 90 days (counted from last furnishing on a sample job). 23 of the 51 jurisdictions we track use this same lien deadline, which makes it the most common rule.
Filed on the state registry. A later lien is possible but only for what the owner still owes.
The clock starts on your last day furnishing labor or materials under your contract. In many states, warranty visits and punch list work done mainly to extend the deadline don't restart it, so use your last day of real contract work.
Deadline to sue on the lien
To keep the lien alive you must sue to enforce it within 24 months after recording the lien. If you record on the last possible day, that is about 821 days after your last day on the job, about 456 days longer than the national median of 365 days. 40 of the 48 jurisdictions we track have a shorter overall time to sue and 6 have a longer one.
Because the clock counts from recording, recording early also moves the lawsuit deadline earlier.
How Iowa compares
Days are counted on a sample job with the lien recorded on its last allowed day, so states that count from recording or from completion can be compared with those that count from your last day on site. The median is across the jurisdictions with a dated rule on file.
- Record the lien (from last day)
- Iowa: 90 daysNational median: 90 days
- Sue to enforce (from last day)
- Iowa: 821 daysNational median: 365 days
Public and federal projects
Public property can't be liened, so subcontractors and suppliers on state and local public jobs in Iowa claim against the GC's payment bond instead. We haven't reduced Iowa's bond claim deadlines to one set of numbers, because they vary by agency and project. The governing law is Iowa Code ch. 573. Verify the notice and suit deadlines with the statute and the bond itself before the job starts.
Federal jobs in Iowa follow the Miller Act instead of state law: those hired by a sub or supplier give the prime contractor notice within 90 days of their last furnishing, and suit is due within 1 year, in federal court. Prime contractors on federal work have no lien or bond claim.
Retainage and prompt payment in Iowa
On public work the cap is 5%, the most common cap among states that set one. Up to 5% of each payment.
On private work we have no statutory cap on file, so retainage is usually whatever the contract says. Read the retainage and release clauses before you sign.
| Public work | Private work | Federal work | |
|---|---|---|---|
| Retainage cap | 5% | Verify | 10% |
| Release | Released after completion and acceptance, less amounts for claims on file. | Verify with state statute | Released with final payment, or earlier once progress is satisfactory. |
| GC pays subs within | Verify | Verify | 7 days |
| Late-payment interest | Verify | Verify | Treasury prompt payment rate (reset every January and July) |
Not legal advice. Retainage and prompt payment rules differ by agency, contract size and contract date, and change often. Confirm the rules with the current statute, your contract and a construction attorney before relying on them.
Worked example: a HVAC sub in Iowa
A HVAC subcontractor hired by the GC on a private distribution warehouse in Iowa starts work on March 2, 2026 and last furnishes on July 17, 2026. The project is completed on August 28, 2026. Run through Iowa's rules, those dates give:
| Deadline | Date | Counted from |
|---|---|---|
| Residential notice on the state lien registry | March 12, 2026 Verify | First furnishing |
| Record the lien | October 15, 2026 | Last furnishing |
| Sue to enforce the lien | October 15, 2028 WeekendVerify | Lien recording |
The first deadline on the calendar is “Residential notice on the state lien registry” on March 12, 2026, counted from the day the crew started, long before any payment is late.
One date lands on a weekend (October 15, 2028). Not every state rolls a deadline to Monday, so the safe move is to record or serve by the Friday before.
Rows marked "Verify" depend on facts or readings we can't settle for you. Check them against Iowa Code ch. 572.
Open the lien deadline calculator for Iowa and enter your own dates to get this table for your job, with countdowns and a PDF deadline calendar.
Check your own dates with the free tools
- Mechanics lien and notice deadline calculator (IA): every notice, lien and suit date for your role, tier and job type.
- Retainage and prompt payment rules (IA): check your contract's retainage against the cap and work out late-payment interest.
- Schedule of values and pay application builder: bill each period with retainage calculated, so what you're owed is documented.
- Cash flow and retainage forecaster: see what slow payment and held retainage do to your bank balance.
Statutes cited
- Iowa Code ch. 572
- Iowa Code ch. 573 (public)
- Iowa Code §573.12 to .14 (public)
- Iowa Code ch. 573A
- Federal work in Iowa: 40 U.S.C. §3131 to §3134 (Miller Act)
Not legal advice. Lien and bond claim rules change and have exceptions for project type, contract terms and how notices are served. Confirm every deadline with the current statute or a construction attorney in the project's state before relying on it. Rules shown as "Verify with state statute" have exceptions or variations we could not reduce to one number.