AL-MP Exam Domains 2026: Complete Guide to All 11 Content Areas

Exam Overview and Format

The Alabama Master Plumber Exam (AL-MP), administered through Prov for the Alabama Plumbers and Gas Fitters Examining Board, is built from a single trade examination that spans 11 distinct content domains. Candidates answer 100 questions in 4.17 hours, and the test is open book - meaning your ability to navigate the 2021 IPC and 2021 IFGC quickly matters as much as memorization. The passing score is 70%.

Starting January 1, 2026, Master applicants also sit a separate Business Law examination: 40 questions, a 2-hour window, and the same 70% passing threshold. Only a failed exam has to be retaken - if you pass the trade exam but fail Business Law (or vice versa), you don't repeat the one you already cleared. For a full breakdown of how these two exams combine into total costs, see the AL-MP Certification Cost 2026: Complete Pricing Breakdown.

This article focuses specifically on the 11 domains that make up the trade examination, since that's where the bulk of technical preparation time should go. If you haven't reviewed eligibility yet, start with AL-MP Requirements 2026: Eligibility, Prerequisites & How to Qualify before diving into domain-level study.

Why Domain Weighting Matters

Not all 11 domains carry equal weight on the 100-question trade exam. Two domains - Sizing and Design and System Installation - are explicitly the largest, meaning a disproportionate share of your 4.17 hours will be spent on questions from those two areas. Treating every domain as equally important is one of the most common planning mistakes candidates make, and it's a theme covered in more depth in How Hard Is the AL-MP Exam? Complete Difficulty Guide 2026.

Because the exam is open book, weighting also changes how you should organize your references. A domain with heavy code-lookup demand (like Sizing and Design) benefits from well-placed permanent tabs; a lighter domain like Roof Drain Systems may only need one or two tabbed sections. Planning your tab layout around domain weight - not alphabetically or by code chapter order - saves real minutes during the exam.

All 11 Domains Explained

Below is what each domain actually tests, based on the trade examination's official content structure. Use this as a checklist against your own knowledge gaps.

The Two Heavyweight Domains

Sizing and Design and System Installation deserve their own strategy because they are officially the largest domains on the 100-question exam. Both draw heavily on the 2021 IPC and 2021 IFGC, so your open-book strategy for these two areas should include:

• Permanent tabs on the fixture unit tables, pipe sizing charts, and gas pipe sizing tables you'll reference repeatedly
• Pen-only margin notes (no calculations) on frequently-confused sections, since Alabama-specific testing rules allow annotations but prohibit movable tabs, Post-it notes, or added photocopies
• Practice questions that force you to look up a table under time pressure, not just recognize the correct code number

Because these two domains combine to represent the largest share of your score, weak performance here is harder to offset with strength elsewhere. If you're unsure where your baseline stands, the diagnostic approach outlined in AL-MP Study Guide 2026: How to Pass on Your First Attempt walks through identifying domain-level weaknesses before you commit study hours.

Allowed References and Materials

Because the trade exam is open book, understanding exactly what you can bring - and how you can mark it - is part of domain preparation, not an afterthought. Permitted items include:

• Approved references, including the 2021 IPC and 2021 IFGC
• Permanent tabs and highlighting within those references
• A simple four-function calculator
• Pen-only margin notes that do not contain calculations

Prohibited items include movable tabs, Post-it notes, added photocopies, and practice-test books brought into the room. Appointments are available both at test centers and through eligible Examroom remote sessions. Getting your reference setup wrong on exam day can cost you time across every domain, so review the exact format rules in AL-MP Passing Score 2026: Exactly What You Need to Pass before you schedule.

Fees, Registration, and Timing

Domain preparation doesn't happen in isolation from the administrative side of the AL-MP process. Here's how the pieces fit together:

In-state applicants need a current Alabama certificate plus at least one year of current, verifiable journeyman work experience, along with Board approval and lawful-presence documentation. Once you pass both required examinations, you must obtain the Master certificate within 90 calendar days. For a scheduling walkthrough of testing windows and this 90-day deadline, see AL-MP Exam Dates 2026: Testing Windows, Deadlines & Scheduling.

After certification, renewal requires four approved continuing education hours annually, subject to Board exemptions. Plumber-only holders need four plumbing hours; dual plumbing/gas holders split the four hours between the two trades. For 2027 certification, CE must be completed and submitted before November 1, 2026, with renewal filed during October 1-December 31, 2026.

Mapping a Study Schedule to the Domains

Rather than a generic weekly template, your schedule should follow the actual weight of the 11 domains. A practical structure looks like this:

Running a full 100-question, 4.17-hour simulation before test day is the single best way to confirm your reference tabs and pacing hold up under real conditions. You can build that habit using timed sets on the AL-MP practice test platform well before you commit to an official appointment.

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