DIAL
CH 91C · REGISTRATION
Verify / Learn More ↗Contractor Registration
Statewide administrative registration baseline for covered construction contractors; not a competency license.
Iowa contractor intelligence
Iowa Contractor License & Trade Guide
Iowa uses a two-layer model: most construction contractors earning at least $2,000 per year register with DIAL under Chapter 91C, while electrical and plumbing/mechanical trades hold real statewide licenses through the IEEB and PMSB. General contractors, roofers, painters and many finish trades do not have a separate statewide competency license.
Source-based build · verify DIAL registration, board license class and scope-specific specialty credentials before relying on eligibility
Commercial threshold$50K
Supplied-source threshold for covered commercial work.
Residential new build$50K
Supplied-source threshold for new residential construction.
Remodel / addition$10K
Supplied-source residential remodel/addition threshold.
Residential roofing$10K
Supplied-source residential roofing threshold.
01 · Licensing model
How Iowa Actually Licenses Contractors
Iowa separates general construction registration from true trade licensing. The routing question is not simply “licensed or not”; it is which program governs the scope.
General construction starts with DIAL registration. The supplied source says contractors earning $2,000 or more per year register under Iowa Code 91C. This is an administrative registration, not a competency license.
Electrical is genuinely state-licensed. The Iowa Electrical Examining Board uses named license classes such as Electrical Contractor, Class A Master, Class B Master, Residential Master, Journeyman and Residential Electrician.
Plumbing and mechanical are genuinely state-licensed. The PMSB covers plumbing, mechanical, HVAC-refrigeration, hydronic and sheet-metal disciplines, with apprentice, journeyperson, master and contractor/entity roles depending on discipline.
Specialty programs remain separate. Asbestos, lead, elevator and fire/alarm work have their own credential or program layers.
Use Iowa permit activity to identify project signals and route them to the right registered contractor, licensed trade or specialty provider.
Get Started for FreeSee the 20 Data Points02 · Core credentials
Codes That Shape the Iowa Market
Iowa is not a license-number-prefix state. These routing labels summarize the registration program and the named statewide trade-license classes that matter most for permit matching.
EC
IEEB · ELECTRICAL
Verify / Learn More ↗Electrical Contractor
Business electrical license; firm is qualified by or employs the required master-level electrician and is registered.
A-MASTER
IEEB · ELECTRICAL
Verify / Learn More ↗Class A Master Electrician
Unrestricted statewide master-level electrical authority in the supplied source.
RES-EC
IEEB · RESIDENTIAL
Verify / Learn More ↗Residential Electrical Contractor
Residential electrical contractor license qualified by an appropriate master-level credential.
PLUMB
PMSB · PLUMBING
Verify / Learn More ↗Plumbing
Statewide PMSB discipline with apprentice, journeyperson and master levels.
MECH
PMSB · MECHANICAL
Verify / Learn More ↗Mechanical
Statewide PMSB mechanical discipline, including contractor/entity routing.
HVAC-R
PMSB · HVAC
Verify / Learn More ↗HVAC-Refrigeration
Statewide PMSB HVAC-refrigeration discipline with apprentice, journeyperson and master levels.
ASB
DIAL · ABATEMENT
Verify / Learn More ↗Asbestos Credentials
DIAL asbestos occupation licenses plus business-permit/project layers as applicable.
Use Iowa permit activity to identify project signals and route them to the right registered contractor, licensed trade or specialty provider.
Get Started for FreeSee the 20 Data Points03 · Trade routing
Iowa Trade Routing Guide
Route by actual scope. General construction usually needs DIAL registration; electrical and PMSB trades require the matching statewide license class; specialty hazards and systems have separate programs.
DIALDIAL · registration
General Building / Remodeling
+
When it fits
Use DIAL contractor registration as the statewide business baseline.
Typical permit signals
New construction, additions, remodels, framing, carpentry and general building activity.
Primary authority
DIAL contractor registration + local permit office.
TigerLeads routing note
Registration is not a competency license; local permit rules still apply.
DIALDIAL · registration
Roofing / Painting / Finish Trades
+
When it fits
The source does not identify separate statewide competency licenses for these trades.
Typical permit signals
Roofing, siding, painting, flooring, finish carpentry and similar permits.
Primary authority
DIAL contractor registration.
TigerLeads routing note
Do not invent a statewide roofing or painting license prefix.
ECIEEB · business
Electrical Contracting
+
When it fits
Use the active Electrical Contractor credential plus the qualifying master requirement.
Typical permit signals
Service upgrades, panels, wiring, commercial and residential electrical permits.
Primary authority
Iowa Electrical Examining Board.
TigerLeads routing note
DIAL registration alone is not enough for electrical work.
A / BIEEB · master
Master Electrical
+
When it fits
Class A Master is unrestricted; Class B Master is limited in the supplied source.
Typical permit signals
Electrical supervision, layout and qualifying-party functions.
Primary authority
Iowa Electrical Examining Board.
TigerLeads routing note
Verify the exact class and scope before routing.
JOURNEYIEEB · field
Journeyman / Residential Electrical
+
When it fits
Use Class A/B Journeyman or Residential Electrician based on scope.
Typical permit signals
Field installation and residential electrical work.
Primary authority
Iowa Electrical Examining Board.
TigerLeads routing note
Named class is the credential; Iowa does not use a per-trade number prefix.
PLUMBPMSB · plumbing
Plumbing
+
When it fits
PMSB plumbing discipline includes apprentice, journeyperson and master levels.
Typical permit signals
Water, sanitary, plumbing fixtures and related plumbing permits.
Primary authority
Plumbing & Mechanical Systems Board.
TigerLeads routing note
PMSB contractors use a combined registration + license workflow.
MECHPMSB · mechanical
Mechanical
+
When it fits
PMSB mechanical discipline covers mechanical contractor/trade work.
Typical permit signals
Mechanical equipment and systems permits.
Primary authority
Plumbing & Mechanical Systems Board.
TigerLeads routing note
Verify the discipline and level needed for the specific job.
HVAC-RPMSB · HVAC
HVAC / Refrigeration
+
When it fits
PMSB HVAC-refrigeration discipline includes apprentice, journeyperson and master levels.
Typical permit signals
HVAC replacement/install, refrigeration and related mechanical permits.
Primary authority
Plumbing & Mechanical Systems Board.
TigerLeads routing note
Route by PMSB discipline rather than generic contractor registration.
HYDRPMSB · hydronic
Hydronic
+
When it fits
PMSB hydronic discipline includes apprentice, journeyperson and master levels.
Typical permit signals
Hydronic heating and piping systems.
Primary authority
Plumbing & Mechanical Systems Board.
TigerLeads routing note
Keep hydronic scope distinct when the permit identifies it.
SHEETPMSB · sheet metal
Sheet Metal
+
When it fits
PMSB sheet-metal discipline includes apprentice and journeyperson levels in the supplied source.
Typical permit signals
Ductwork and sheet-metal system permits.
Primary authority
Plumbing & Mechanical Systems Board.
TigerLeads routing note
The supplied source notes no master class for sheet metal.
ASB / LEADDIAL · environmental
Asbestos / Lead
+
When it fits
Use the applicable DIAL occupation, contractor, firm or business credential.
Typical permit signals
Abatement, renovation or demolition involving regulated asbestos or lead.
Primary authority
DIAL asbestos and lead programs.
TigerLeads routing note
Never merge hazardous-material work into generic remodel routing.
ELEV / FIREDIAL / SFM · specialty
Elevator / Fire-Alarm Systems
+
When it fits
Use the specialty program applicable to elevator/conveyance or alarm-system work.
Typical permit signals
Elevator permits and fire/alarm system work.
Primary authority
DIAL Elevator Safety / Iowa State Fire Marshal.
TigerLeads routing note
The supplied source marks these specialty lanes for confirmation before hard gate lock.
Use Iowa permit activity to identify project signals and route them to the right registered contractor, licensed trade or specialty provider.
Get Started for FreeSee the 20 Data Points04 · Credential directory
Iowa Credential & Routing Directory
Search the core registration, electrical, plumbing/mechanical, environmental and specialty labels used in the supplied Iowa source.
DIAL
Dept. of Inspections, Appeals & Licensing
Umbrella agency
CH 91C
Contractor Registration Statute
Registration baseline
IEEB
Iowa Electrical Examining Board
Electrical licensing
PMSB
Plumbing & Mechanical Systems Board
Plumbing/mechanical licensing
EC
Electrical Contractor
IEEB business license
RES-EC
Residential Electrical Contractor
IEEB residential business
A-MASTER
Class A Master Electrician
Unrestricted master
B-MASTER
Class B Master Electrician
Restricted master
RES-M
Residential Master
Residential supervision
A-JOURNEY
Class A Journeyman
IEEB field credential
B-JOURNEY
Class B Journeyman
Grandfather/restricted class
RES-E
Residential Electrician
Residential field credential
APP-E
Electrical Apprentice
Supervised credential
SPEC-E
Special Electrician
Limited electrical scope
UNCL
Unclassified Person
Limited electrical role
PLUMB-A
Plumbing Apprentice
PMSB
PLUMB-J
Plumbing Journeyperson
PMSB
PLUMB-M
Plumbing Master
PMSB
MECH-A
Mechanical Apprentice
PMSB
MECH-J
Mechanical Journeyperson
PMSB
MECH-M
Mechanical Master
PMSB
HVAC-A
HVAC-R Apprentice
PMSB
HVAC-J
HVAC-R Journeyperson
PMSB
HVAC-M
HVAC-R Master
PMSB
HYDR-A
Hydronic Apprentice
PMSB
HYDR-J
Hydronic Journeyperson
PMSB
HYDR-M
Hydronic Master
PMSB
SHEET-A
Sheet Metal Apprentice
PMSB
SHEET-J
Sheet Metal Journeyperson
PMSB
PMSB-C
Contractor Entity
Combined registration + license
MED-GAS
Medical-Gas Certification
PMSB add-on
ASB-C/S
Asbestos Contractor/Supervisor
DIAL asbestos
ASB-I
Asbestos Inspector
DIAL asbestos
LEAD-C
Lead Abatement Contractor
DIAL lead
LEAD-R
Lead-Safe Renovator
DIAL lead
LOCAL
Local Permit / License Layer
Jurisdictional overlay
05 · Permit signals
Iowa Permit Signals Worth Watching
These permit categories can indicate upcoming demand. They are opportunity signals, not guarantees of open bidding or awarded work.
General building / remodel
DIAL
GCs · remodelers · framers · carpenters
Verify current contractor registration and local permit rules.
Roofing / exterior / finish
DIAL
Roofers · siding · painters · flooring
Registration-based routing; no statewide competency license in the source.
Electrical service / new electrical
EC + IEEB class
Electrical contractors · suppliers
Verify the active contractor and qualifying license class.
Plumbing
PMSB · PLUMB
Plumbing contractors · suppliers
Verify the PMSB plumbing discipline and level.
HVAC / refrigeration
PMSB · HVAC-R
HVAC contractors · equipment suppliers
Route to the HVAC-refrigeration discipline.
Mechanical / hydronic / sheet metal
PMSB
Mechanical · hydronic · sheet-metal trades
Match the exact PMSB discipline shown by the permit scope.
Demolition / asbestos / lead
ASB / LEAD
Abatement · remediation · demolition
Layer the appropriate DIAL environmental credential.
Elevator / fire-alarm
ELEV / FIRE
Elevator · alarm system contractors
Use specialty program verification before routing.
Use Iowa permit activity to identify project signals and route them to the right registered contractor, licensed trade or specialty provider.
Get Started for FreeSee the 20 Data Points06 · Verification workflow
How to Verify an Iowa Contractor
Iowa verification is program-based. Check DIAL registration where required, then confirm the exact board license class or specialty credential that matches the work.
01
Check DIAL registration
Confirm the contractor appears in the DIAL contractor-registration system when Chapter 91C applies.
02
Match the program
Electrical routes to IEEB; plumbing/mechanical/HVAC/hydronic/sheet metal route to PMSB.
03
Check the license class
For electrical and PMSB work, verify the named class or discipline rather than looking for a trade prefix.
04
Check specialty credentials
Asbestos, lead, elevator and fire/alarm work use separate program records.
Use Iowa permit activity to identify project signals and route them to the right registered contractor, licensed trade or specialty provider.
Get Started for FreeSee the 20 Data Points07 · Official sources
Official Iowa Sources
Use the issuing agency and board pages for current verification. The supplied source centers DIAL, IEEB, PMSB, Iowa statutes and specialty program pages.
01DIAL Contractor RegistrationChapter 91C registration↗02IEEB Electrical LicensingElectrical license information↗03PMSB Plumbing & MechanicalPlumbing/mechanical licensure↗04Iowa Code 91CContractor registration statute↗05Iowa Code 103Electrical licensing statute↗06Iowa Code 105Plumbing/mechanical statute↗07DIAL AsbestosAsbestos occupation licensing↗08DIAL LeadLead professional certification↗09Iowa State Fire MarshalFire/alarm specialty programs↗10DIAL Home / LicensingAgency licensing portal↗11Iowa Department of RevenueOut-of-state contractor tax/form layer↗12TigerLeads Permit Data PointsHow permit fields become opportunity intelligence↗
08 · FAQ
Iowa Contractor Licensing Questions
These answers follow the supplied Iowa source and should be rechecked against current agency records before operational use.
01 Does Iowa have a statewide general-contractor license? +
No. The supplied source says Iowa uses DIAL contractor registration for general construction rather than a statewide GC competency license.
02 Who must register with DIAL? +
The supplied source states construction contractors earning $2,000 or more per year must register under Iowa Code 91C, subject to listed exemptions.
03 Is DIAL contractor registration a license? +
No. The source describes it as an administrative registration with no competency exam.
04 What is DIAL? +
The Iowa Department of Inspections, Appeals & Licensing, the umbrella agency for contractor registration and several construction-facing licensing programs.
05 What is IEEB? +
The Iowa Electrical Examining Board, which licenses electrical trades statewide under Iowa Code 103.
06 What is PMSB? +
The Plumbing & Mechanical Systems Board, which licenses plumbing, mechanical, HVAC-refrigeration, hydronic and sheet-metal trades under Iowa Code 105.
07 Does Iowa license electricians statewide? +
Yes. The source identifies 11 named IEEB classes, including contractor, master, journeyman and residential classes.
08 What is a Class A Master Electrician? +
The supplied source describes Class A Master as unrestricted statewide master-level authority.
09 What is a Class B Master Electrician? +
The source describes it as limited to one- and two-family dwellings and agricultural buildings, subject to local restrictions.
10 Does an electrical contractor also need registration? +
Yes. The source says electrical contractors also hold the DIAL registration layer.
11 Which PMSB disciplines are listed? +
Plumbing, Mechanical, HVAC-Refrigeration, Hydronic and Sheet Metal.
12 What levels exist in PMSB disciplines? +
The source lists apprentice, journeyperson and master for most disciplines; sheet metal lists apprentice and journeyperson, plus contractor/entity and specialty add-ons.
13 How do plumbing/mechanical contractors register? +
The source says they use a combined PMSB registration + license rather than a separate DIAL contractor-registration filing.
14 How is asbestos work routed? +
Use the applicable DIAL asbestos occupation license and business-permit/project compliance layer.
15 How is lead work routed? +
Use the applicable DIAL lead professional or firm credential, such as abatement or lead-safe renovation.
16 Does Iowa use trade prefixes in license numbers? +
The supplied source says no; routing should key on the board/program and the named license class.
17 Do local permit rules still matter? +
Yes. State registration or licensing does not eliminate municipal code, permit or local requirements.
18 How should Iowa permits be used in TigerLeads? +
As project signals that can indicate likely upcoming demand. A permit is not proof of an open bid, guaranteed job or contractor availability.
Turn Iowa Permits Into Earlier Opportunities.
TigerLeads helps contractors, trades and suppliers identify permit-driven project signals, understand likely scope and reach the Iowa market earlier.
