Construction / Code Official License / Wisconsin
- Wisconsin
- Code Official License
- UDC & Commercial Inspectors
- Updated Oct 2026
How to Get Your Wisconsin Building Inspector Certifications
Wisconsin certifies building, electrical, HVAC and plumbing inspectors through the Department of Safety and Professional Services. This page covers all seven inspector certifications, the exams, the credentials that let you skip them and how to stay certified.
Last updated October 28, 2026 from Wisconsin Department of Safety and Professional Services requirements
Application fee
Not stated
Confirm the current fee with DSPS when you apply
Exam time
3–4 hrs
3 hrs for UDC exams, 4 hrs for commercial building and electrical
Time to get license
Varies
Commercial electrical by exam needs 3–6 yrs of experience
Continuing ed
24 hrs
Every 4-year renewal
Overview
Do you need a Wisconsin code official license?
Yes, if you inspect buildings to enforce Wisconsin’s state codes. Wisconsin calls it a certification, and it’s issued by the Department of Safety and Professional Services (DSPS). There are two families: UDC certifications for one- and two-family dwellings, and commercial certifications for public buildings and places of employment.
License required when
- You inspect one- and two-family dwellings during construction to enforce the Uniform Dwelling Code (UDC Construction, Electrical, HVAC or Plumbing Inspector)
- You inspect public buildings and places of employment to enforce the Commercial Building Code (Commercial Building Inspector)
- You enforce the Commercial Electrical Code in public buildings and places of employment (Commercial Electrical Inspector)
- You enforce the Commercial Plumbing Code in public buildings and places of employment (Commercial Plumbing Inspector)
Common exceptions
- You can skip the state exam, though not the certification, if you hold an accepted credential, such as certain ICC certifications or a Wisconsin Master Electrician license
- A current Wisconsin Commercial Building Inspector certification qualifies you for UDC Construction Inspector and UDC HVAC Inspector without another exam
- A Wisconsin Master or Journeyman Plumber license qualifies you for Commercial Plumbing Inspector without the exam
Working without certification
Our sources don’t list specific penalties. DSPS issues and renews these certifications, so inspecting without a current one can put your job and your inspections at risk. Check with DSPS before you perform any inspection.
Your fast-track Wisconsin code official license checklist
The Wisconsin application, one page
- Chosen your UDC or commercial certification
- LicensE portal account and application submitted
- Copies of current licenses or ICC certifications, if you’re skipping the exam
- Transcripts, if you’re claiming school or a degree toward electrical experience
- Exam eligibility from DSPS
- Code books and a three-hole punched binder for the open-book exam
Types
Wisconsin code official license types and classifications
Wisconsin has four UDC inspector certifications for one- and two-family homes and three commercial certifications. Each has its own state exam, and most also accept a license or certification you may already hold in place of the exam.
UDC-C
Most common
UDC Construction Inspector
Inspects one- and two-family dwellings during construction to administer and enforce the Uniform Dwelling Code.
Exam
115 questions, 3 hrs
Limit
1- & 2-family homes
UDC-E
Electrical
UDC Electrical Inspector
Inspects one- and two-family dwellings to enforce the Electrical Standards Code.
Exam
90 questions, 3 hrs
Limit
1- & 2-family homes
UDC-H
HVAC
UDC HVAC Inspector
Inspects heating, ventilating and air conditioning in one- and two-family dwellings.
Exam
State exam, 70% to pass
Limit
1- & 2-family homes
UDC-P
Exam only
UDC Plumbing Inspector
Inspects one- and two-family dwellings to enforce plumbing codes. The only route is the state exam.
Exam
State exam, 70% to pass
Limit
1- & 2-family homes
CBI
ICC accepted
Commercial Building Inspector
Inspects public buildings and places of employment to enforce the Commercial Building Code.
Exam
4 hrs, or ICC certification
Limit
Commercial buildings
CEI
Experience required
Commercial Electrical Inspector
Enforces the Commercial Electrical Code in public buildings and places of employment.
Exam
4 hrs, or ICC certification
Limit
Commercial buildings
CPI
Two-part exam
Commercial Plumbing Inspector
Enforces the Commercial Plumbing Code in public buildings and places of employment.
Exam
2 parts, 3 hrs each
Limit
Commercial buildings
Requirements
Wisconsin code official license requirements, class by class
Every class has two routes: pass the state exam, or show a current credential DSPS accepts. Only the Commercial Electrical Inspector exam route adds an experience requirement.
| Requirement | UDC classes | Commercial Building | Commercial Electrical | Commercial Plumbing |
|---|---|---|---|---|
| Experience | Not stated | Not stated | 6 yrs at 1,000 hrs/yr, or 3 yrs with an electrical engineering degree or a PE, architect or electrical designer credential | Not stated |
| State exam | Open book, 70%; 3 hrs for Construction and Electrical | Open book, 70%, 4 hrs | Open book, 70%, 4 hrs | Two parts, open book, 70%, 3 hrs each |
| Credential instead of exam | Varies by class (none for UDC Plumbing) | ICC C5, B5, C3, B2 + M2 or B3 + M3, or a Wisconsin architect or engineer registration | Wisconsin Master Electrician, ICC E2 or E5, or IAEI/NFPA Master Electrical Inspector | Wisconsin Master or Journeyman Plumber license |
| Application fee | Not stated | Not stated | Not stated | Not stated |
| Renewal | Every 4 yrs, June 30 | Every 4 yrs, June 30 | Every 4 yrs, June 30 | Every 4 yrs, June 30 |
| Continuing ed | 24 hrs | 24 hrs | 24 hrs | 24 hrs |
Steps
How to get your Wisconsin code official license, step by step
- Pick your certificationBefore you start
Decide whether you’ll inspect one- and two-family homes (UDC) or public buildings and places of employment (commercial), and which trade. - Check for an exam waiverBefore you apply
If you already hold an accepted credential, like an ICC certification, a Wisconsin Master Electrician or a Master or Journeyman Plumber license, you can upload it instead of testing. - Apply through the LicensE portalBefore the exam
Submit your application and fees in the DSPS LicensE portal. Include copies of any current licenses, certifications and, for the electrical experience routes, transcripts. - Get your exam eligibilityAfter you apply
DSPS reviews your application and confirms you’re eligible to schedule the exam. - Pass the state examExam day
Exams are open book and take 70% to pass. Test centers are in Pewaukee, Appleton, Weston, DeForest and Eau Claire. Commercial Plumbing applicants must pass both parts. - Receive your certificationBy mail
Once everything is complete, DSPS mails your certification to you.
Exam
What to expect on the Wisconsin code official exam
Each certification has its own open-book state exam built on Wisconsin’s administrative code plus national codes like the IBC or NEC. Electrical inspector exams switched to the 2023 National Electrical Code on October 1, 2026.
Format
Open book
Questions
90–115 (UDC); others not stated
Passing score
70%
Exam vendor
DSPS or Pearson VUE
Scoring & content
- UDC Construction: 115 questions, 3 hrs, on SPS 305, SPS 320–322 and the UDC appendix
- UDC Electrical: 90 questions, 3 hrs, on SPS 305, 316, 320, 324 and the 2023 NEC
- Commercial Building: 4 hrs, on SPS 305, SPS 361–366, the 2021 IBC, IMC, IFGC, IECC and IEBC, and ICC A117.1-2017
- Commercial Plumbing: two parts, 3 hrs each, on SPS 302, 305, 381–387, NFPA 13D and six system component manuals in one binder
- Printed notes and code must be three-hole punched in a three-ring binder; tabbed dividers are fine, but sticky notes, removable tabs, paper clips and loose papers aren’t
Retake policy
- Retake rules and waiting periods aren’t stated in our sources, so confirm with DSPS
- You schedule only after DSPS confirms your eligibility
- Practice and previous exams aren’t allowed in the testing room
- Commercial Plumbing applicants must pass both parts to meet the exam requirement
Exam references · Open book
Every Wisconsin inspector exam (UDC Construction, Electrical, HVAC and Plumbing, plus Commercial Building, Electrical and Plumbing) is open book. Printed code and notes are allowed only if they’re three-hole punched and kept in a three-ring binder; tabbed binder dividers are fine, but removable tabs, sticky notes, paper clips, loose papers and practice exams aren’t.
| Book | Edition | Use |
|---|---|---|
| Wis. Admin. Code SPS 305 — all inspector exams | Not stated | Allowed in exam |
| Wis. Admin. Code SPS 320–322, Uniform Dwelling Code — UDC Construction Inspector exam | Not stated | Allowed in exam |
| Wis. Admin. Code SPS 320, 322–323, Uniform Dwelling Code — UDC HVAC Inspector exam | Not stated | Allowed in exam |
| Uniform Dwelling Code Appendix A, B and C — UDC Construction and UDC HVAC Inspector exams | Not stated | Allowed in exam |
| Wis. Admin. Code SPS 316, 320 and 324 — UDC and Commercial Electrical Inspector exams | Not stated | Allowed in exam |
| NFPA 70: National Electrical Code (NEC) — UDC and Commercial Electrical Inspector exams | 2023 | Allowed in exam |
| Key Word Index (NEC) — UDC and Commercial Electrical Inspector exams | 2023 | Not stated |
| Ugly’s Electrical References — UDC and Commercial Electrical Inspector exams | 2023 | Not stated |
| Wis. Admin. Code SPS 325, 381, 382 and 384 — UDC Plumbing Inspector exam | Not stated | Allowed in exam |
| NFPA 13D: Standard for the Installation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes — UDC Plumbing Inspector exam | 2002 | Allowed in exam |
| Wis. Admin. Code SPS 361–366 (SPS 360 is not tested) — Commercial Building Inspector exam | Not stated | Allowed in exam |
| International Building Code (IBC) — Commercial Building Inspector exam | 2021 | Allowed in exam |
| International Mechanical Code (IMC) — Commercial Building Inspector exam | 2021 | Allowed in exam |
| International Fuel Gas Code (IFGC) — Commercial Building Inspector exam | 2021 | Allowed in exam |
| International Energy Conservation Code (IECC) — Commercial Building Inspector exam | 2021 | Allowed in exam |
| International Existing Building Code (IEBC) — Commercial Building Inspector exam | 2021 | Allowed in exam |
| ICC A117.1 Standard for Accessible and Usable Buildings and Facilities — Commercial Building Inspector exam | 2017 | Allowed in exam |
| Wis. Admin. Code SPS 302 and 381–387 — Commercial Plumbing Inspector exam (Parts 1 & 2) | Not stated | Allowed in exam |
| NFPA 13D Standard (National Fire Protection Association) — Commercial Plumbing Inspector exam (Parts 1 & 2) | 2007 | Allowed in exam |
| Component manuals in one three-ring binder: At-Grade Pressure Distribution, Holding Tank, Single Pass Sand Filter, In-Ground Soil Absorption, Mound, and Pressure Distribution — Commercial Plumbing Inspector exam (Parts 1 & 2) | Not stated | Allowed in exam |
Starting October 1, 2026, Wisconsin’s electrical inspector exams are based on the 2023 NEC.
Prep
Best Wisconsin code official exam prep, compared
We haven’t compared prep courses for this exam yet.
Costs
How much does a Wisconsin code official license cost?
| Item | Type | Estimate |
|---|---|---|
| Application fee | Fixed | Not stated |
| Exam fee | Fixed | Not stated |
| Wisconsin Administrative Code chapters | Fixed | Free online |
| National code books (IBC, NEC, NFPA 13D and others) | Variable | Varies |
| Three-ring binder and tabbed dividers | Variable | Varies |
| State fees | Not stated in our sources; confirm with DSPS | Not stated |
The Wisconsin code chapters you need are free to print from the Wisconsin Legislature site.
Reciprocity
Does Wisconsin accept out-of-state code official licenses?
Wisconsin has only limited reciprocity arrangements. What helps most is that DSPS accepts several national credentials in place of its own exams.
No reciprocity agreements listed
Our sources don’t name any state agreements. Apply as a new applicant and check with DSPS for the latest arrangements.
Any state — Commercial Building exam waived with ICC
ICC C5 Commercial Combination, B5 Building Inspector, C3 Combination Plans Examiner, B2 + M2, or B3 + M3 can replace the state exam.
Any state — Commercial Electrical exam waived with ICC or IAEI
ICC E2 Commercial Electrical Inspector, ICC E5 Electrical Inspector, or an IAEI/NFPA Master Electrical Inspector certification can replace the state exam and experience.
Local
Do Wisconsin cities and counties have their own code official licensing rules?
Your certification comes from the state, but the inspections themselves happen for local building departments.
State handles
- UDC and commercial inspector certifications
- Exam eligibility and state exams
- 4-year renewals and the 24-hour CE requirement
- Accepting ICC, IAEI and Wisconsin trade credentials in place of exams
City & county handle
- Hiring inspectors for their building departments
- Building permits
- Scheduling and performing local inspections
Governance
Who regulates code officials in Wisconsin
Licensing authority
Wisconsin Department of Safety and Professional Services
608-266-2112
Oversight responsibilities
- Issues and renews UDC and commercial inspector certifications
- Approves exam eligibility and administers the inspector exams
- Decides which ICC, IAEI and Wisconsin credentials replace an exam
- Sets the 24-hour continuing education requirement
Maintenance
How to renew your Wisconsin code official license and keep it active
Every Wisconsin inspector certification expires every 4 years on June 30. To renew, complete 24 hours of approved continuing education and submit your renewal to DSPS.
Renewal cycle
Every 4 years
CE hours
24
Renewal fee
Not stated
Late penalty
Not stated
FAQ
Wisconsin code official license FAQs
Do I need an ICC certification to be a building inspector in Wisconsin?
No. Wisconsin has its own state exams. ICC certifications are an alternative route for Commercial Building and Commercial Electrical Inspector, not a requirement.
Which ICC certifications does Wisconsin accept?
For Commercial Building Inspector: C5, B5, C3, B2 with M2, or B3 with M3. For Commercial Electrical Inspector: E2 or E5. A Wisconsin architect or engineer registration also works for Commercial Building.
Are the Wisconsin inspector exams open book?
Yes. All of them are open book, and you need 70% to pass. Notes and printed code must be three-hole punched in a three-ring binder.
How long is the UDC Construction Inspector exam?
It has 115 questions and you get 3 hours. It covers SPS 305, SPS 320–322 and the Uniform Dwelling Code appendix.
Do I need experience to become a Commercial Electrical Inspector?
Yes, if you go the exam route: 6 years at 1,000 hours a year, or 3 years with an electrical engineering degree or a PE, architect or electrical designer credential. A Wisconsin Master Electrician license lets you skip both.
Can a licensed plumber become a plumbing inspector without the exam?
For Commercial Plumbing Inspector, yes, with a current Wisconsin Master or Journeyman Plumber license. UDC Plumbing Inspector requires the state exam.
How often do I renew, and how much CE do I need?
Every 4 years on June 30, with 24 hours of approved continuing education.
Sources
Official sources for the Wisconsin code official license
- DSPS, Commercial Building Inspector
- DSPS, Commercial Electrical Inspector
- DSPS, Commercial Plumbing Inspector
- DSPS, UDC Construction Inspector
- DSPS, UDC Electrical Inspector
- DSPS, UDC HVAC Inspector
- DSPS, UDC Plumbing Inspector
- Wis. Admin. Code § SPS 305
Last updated October 28, 2026. Spot something out of date? Tell us.
Exam Insiders is an independent guide and is not affiliated with the Wisconsin Department of Safety and Professional Services.