Which Guide Do I Need?

Find the right study guide

Match the exact designation and code edition shown in your exam registration. Use the comparison below as a starting point, then confirm the current exam outline and approved references with your examination provider.

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Before you choose

  • Confirm your exam

    Identify the exact exam or designation listed by your testing provider.

  • Check the code edition

    Match the guide to the code year or edition required for your exam.

  • Review the product page

    Confirm the listed references and contents on the product page. Keystone guides are digital PDFs delivered electronically.

2021 and 2024 code cycles

Compare inspector exam designations

B1 — Residential Building Inspector

Choose the B1 guide when you are registered for the Residential Building Inspector exam using the 2024 International Residential Code. Try the free B1 practice test before purchasing.

B2 — Commercial Building Inspector

Choose the B2 guide when you are registered for the Commercial Building Inspector exam using the 2021 International Building Code.

E1 — Residential Electrical Inspector

The current 2024 E1 reference set includes both the 2024 International Residential Code and 2023 National Electrical Code. Review the product scope carefully and make sure your preparation covers every approved reference.

M1 — Residential Mechanical Inspector

Choose the M1 guide when you are registered for the Residential Mechanical Inspector exam using the 2024 International Residential Code.

M2 — Commercial Mechanical Inspector

Choose the M2 guide when you are registered for the Commercial Mechanical Inspector exam using the 2021 International Mechanical Code and 2021 International Fuel Gas Code.

P1 — Residential Plumbing Inspector

Choose the P1 guide when you are registered for the Residential Plumbing Inspector exam using the 2024 International Residential Code.

P2 — Commercial Plumbing Inspector

Choose the P2 guide when you are registered for the Commercial Plumbing Inspector exam using the 2021 International Plumbing Code and 2021 International Fuel Gas Code.