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Residential Building Inspector - B1
The Residential Building Inspector (B1) is the International Code Council's national certification exam for inspectors of one- and two-family dwellings, townhomes not more than three stories, and accessory structures: a 60-question, 2-hour, open-book multiple-choice test on the International Residential Code, offered in 2021 and 2024 code-year editions and delivered via ICC's PRONTO proctored online testing option.
Official exam siteJump to prep options ↓
Questions60 questions
Testing time2 hours
ScoringPassing score set by the Code Council and its Exam Development Committee as a scale score of 75; score reports are pass/fail (passing reports show a 'Pass' notification only)
Exam feeUSD 320 (ICC Store list price for the B1 exam; ICC members receive discounted exam pricing — member price shown at purchase via myICC)
Prep options
Study resources for B1
Independent prep
Courses and study resources
Exam overview
What to know before choosing your prep
- Who runs it
- ICC
- Category
- Building Codes & Inspection
- Current version
- Offered against two code-year editions — the 2021 and the 2024 International Residential Code (IRC); candidate selects the code year at registration
- Where it applies
- United States — national
- Exam languages
- English
- Testing provider
- ICC PRONTO (Proctored Remote Online Testing Option; remote proctoring by ProctorU) — Pearson VUE administers other ICC testing programs (UST/AST, Contractor/Trades) but is not listed as a B1 delivery method in the current Exam Catalog
- Format
- Computer-based, open-book exam delivered via ICC's PRONTO (Proctored Remote Online Testing Option), in person at test sites or online with a remote proctor; the approved reference (2021 or 2024 IRC) is available digitally at no additional cost (DC for Exams)
- Availability
- Year-round by appointment — PRONTO online proctoring available 24/7, 365 days a year, plus in-person PRONTO testing; exam purchase is valid for one year to schedule or reschedule
- Results
- Results available immediately after completion, online or at the testing site; failing candidates receive a diagnostic report with scale/percentile score and content-area performance
- Remote testing
- Available
Exam structure
60 four-option multiple-choice questions (one option scored correct), open book, across seven content areas: Code Administration 4%, Building Planning 8%, Footings and Foundations 16%, Floor Construction 14%, Wall Construction and Coverings 27%, Roof/Ceiling Construction 14%, Public Safety and Special Construction 17%
Where rules vary
Uniform national exam (catalog State field 'National/All'); national exams test climate and geographical conditions represented by all U.S. regions, and jurisdictions adopt/recognize the credential individually.