1. Set up small projects or a portion of large projects
12% of the examIdentify weak areas and improve with focused review.
Start PracticingPass your CPDT certification
Free CPDT Practice Test
Pass the Certified Plumbing Design Technician exam with confidence.
Start with a free CPDT practice test and build exam-ready confidence for the Certified Plumbing Design Technician exam.
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1000+CPDT Questions
10Exam Domains
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Everything your CPDT certification prep needs
Practice expert-vetted questions, find your weak domains, and turn every mistake into a focused review plan.
Expert-vetted questions
Every question is reviewed by an experienced CPDT professional for clarity, accuracy and practical exam relevance.
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Domain analytics show which parts of the exam blueprint are holding you back.
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Missed questions become a review list, so nervous guessing turns into focused repetition.
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Study by domain
Practice the CPDT exam by domain
2. Collect utility data prior to layout
7% of the examIdentify weak areas and improve with focused review.
Start Practicing3. Research codes, ordinances, and building certifications
4% of the examIdentify weak areas and improve with focused review.
Start Practicing4. Lay out general systems
16% of the examIdentify weak areas and improve with focused review.
Start Practicing5. Coordinate with other disciplines
16% of the examIdentify weak areas and improve with focused review.
Start Practicing6. Perform sizing calculations
16% of the examIdentify weak areas and improve with focused review.
Start Practicing7. Select equipment
12% of the examIdentify weak areas and improve with focused review.
Start Practicing8. Prepare documentation for submission
5% of the examIdentify weak areas and improve with focused review.
Start Practicing9. Support construction administration
7% of the examIdentify weak areas and improve with focused review.
Start Practicing10. Prepare project closeout documentation
5% of the examIdentify weak areas and improve with focused review.
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Frequently asked questions
Straight answers about the CPDT exam, the questions, pricing, the free trial, and how this fits your prep.
The CPDT exam spans 10 domains - Set up small projects or a portion of large projects (12%), Collect utility data prior to layout (7%), Research codes, ordinances, and building certifications (4%), Lay out general systems (16%), Coordinate with other disciplines (16%), Perform sizing calculations (16%), Select equipment (12%), Prepare documentation for submission (5%), Support construction administration (7%), and Prepare project closeout documentation (5%). Every practice question maps to one of them, so you train on exactly what's tested.
The Certified Plumbing Design Technician (CPDT) exam has 100 questions and is completed in 3 hours 30 minutes. Our timed practice tests mirror that length and pacing, so exam day feels familiar.
No - and that matters. These are original practice questions written to mirror the style, difficulty, and domain coverage of the CPDT exam blueprint. We never distribute actual exam content, so practicing here keeps you fully compliant with official exam policies.
No. CPDT Exam Prep is an independent study resource for Certified Plumbing Design Technician (CPDT). It is not affiliated with, sponsored by, or endorsed by the official certifying body or exam administrator.
Every paid plan unlocks the full bank of 1,000+ practice questions covering all 10 CPDT domains - Set up small projects or a portion of large projects (12%), Collect utility data prior to layout (7%), Research codes, ordinances, and building certifications (4%), Lay out general systems (16%), Coordinate with other disciplines (16%), Perform sizing calculations (16%), Select equipment (12%), Prepare documentation for submission (5%), Support construction administration (7%), and Prepare project closeout documentation (5%). You can practice the whole bank, filter by domain, or run a timed, domain-balanced exam simulation.
Yes - the bank is maintained against the current exam outline, and questions are revised when the exam changes.
No honest practice platform can guarantee a pass. What realistic practice does is show you - before exam day - exactly which domains are weak, and give you the repetitions to fix them. That's the difference between hoping you're ready and knowing where you stand.
Yes. You get 10 free sample questions with instant feedback - no credit card and no account required.
The free sample shows you the question quality. Paid plans unlock the full 1,000+ question bank, exam-style practice modes, mistake review, and - on Fast Track and Pass Confidence - progress analytics that show your readiness by domain.
No. Every plan is a single one-time payment for a fixed access window - 48 hours, 7 days, or 6 weeks. There is no auto-renewal and no recurring billing.
Match it to your exam date: Final Review (2 days) for an exam in the next day or two, Fast Track (7 days) for an exam this week, Pass Confidence (6 weeks) for a structured run-up.
For most countries, the price you see is exactly what you pay - tax is already included. Where local law requires it to be added separately, it's shown clearly at checkout before you pay, so there are never any surprise fees.
Access is instant after payment and runs for your plan's full window from that moment. When the window ends, your local progress stays on your device - you can buy another window any time and pick up where you left off.
Yes - the whole platform is mobile-first: practice, mistake review, and analytics all work on any phone, tablet, or laptop with a browser. Nothing to install.
Every answer feeds your per-domain accuracy, readiness score, and weak-area list. Instead of re-reading everything, you drill the domains that are actually costing you points - that's what moves a score in days, not months.
Chat with us any time - the 24/7 support chat in the corner of every page gives instant answers about plans, access, and billing. Prefer email? The contact link is in the footer. Payments are processed securely by Stripe, and active customers can download an invoice from their profile page.
Make sure you're signed in with the same email you used at checkout - access activates within a minute of payment. If it still doesn't appear, email us from the contact link in the footer and it'll be sorted out.
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Drill a single domain, run a mixed session, or sit a full timed exam simulation - pick the mode that fits your study window.
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Focus on one CPDT domain at a time - pick it here, then choose a mode.
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Start quick practice →Domain Practice
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A full-length timed exam that mirrors the real CPDT test, balanced across every domain.
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Flashcards
Flip, grade yourself, and repeat the tough ones until they stick.
Train with flashcards →Review Mistakes
Re-drill the questions you got wrong.
Review now →Review Weak Domains
Drill your lowest-scoring domains first.
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A focused 48-hour cram for candidates sitting the exam in the next day or two.
- Full 1,000+ question bank
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- 48 hours of unlimited practice
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Fast Track
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Trusted by CPDT candidates
Real feedback from CPDT candidates on Reddit.
"almost didnt register in time, procrastinated like crazy. the sizing calculation practice sets saved me, i was weak on that part and ran thru like 200 of them before i felt solid. passed first try, no penalty for wrong answers which also helped my nerves."
"was skeptical at first since most of my studying was for layout stuff not coordinating with other disciplines, which is honestly where i was weakest. found a site, cpdtexam.com, that broke that part down separate from everything else and it just clicked after a few passes. relief more than anything when the results came back."
"mock exams were the thing that got me thru. did two full length ones under actual time limits and that alone told me i needed to slow down on the utility data questions. passed, no fireworks, just glad its over."