- What This Cheat Sheet Covers
- The Exam at a Glance
- Eligibility Checklist
- Fees, Retakes, and Eligibility Window
- The Five Domains and Their Weights
- Safety: The 32% Domain
- Environmental, Operations, Project, and People
- How Questions Are Likely to Feel
- A Domain-Driven Review Order
- Results, Validity, and Renewal
- FAQ
- The CDS exam has 110 four-option multiple-choice questions and a 2 hour 30 minute time limit.
- Safety carries the heaviest weight at 32%; People Management is next at 18%, behind Operational Methodology at 19%.
- Initial fee is $595 for NDA members and $755 for non-members; a CDS retake costs $445.
- Eligibility centers on five hands-on demolition years within the last seven, plus OSHA 30 and fall-protection training.
What This Cheat Sheet Covers
This page is a one-sitting review of the facts that matter for the Certified Demolition Supervisor (CDS) credential offered through the National Demolition Association (NDA). It is not about any other certification that happens to share the same three letters. Everything below is specific to supervisors who run demolition work: planning it, keeping crews safe, managing environmental exposure, and delivering projects through people and paperwork.
If you are brand new to the credential, start with what CDS certification is and then come back. If you want a longer, structured plan, the CDS study guide goes deeper than a cheat sheet can. Use this page as the checklist you read the night before you test and the quick reference you return to during review.
The Exam at a Glance
| Item | What to Know |
|---|---|
| Credential body | National Demolition Association (NDA) |
| Delivery | Meazure Learning, with live remote proctoring or test center options |
| Questions | 110 multiple-choice, four answer options each |
| Time limit | 2 hours 30 minutes |
| Scoring approach | Criterion-referenced scaled standard |
| Passing cut | Numerical cut score not publicly verified |
| Scored vs. unscored items | Split not verified |
| Open-book or calculator rules | Not verified; confirm in your candidate materials |
| Results timing | Approximately six to eight weeks after the testing window closes |
Two practical points stand out. First, 150 minutes for 110 questions leaves a bit under a minute and a half per item on average, which is comfortable for recall questions and tighter for scenario items that require you to read carefully. Second, because the passing score is described as a criterion-referenced scaled standard rather than a published percentage, you should not plan around a "get 70% and go home" target. The detail is covered in CDS passing score: exactly what you need to pass, and it is worth reading before you decide how much margin you want in your preparation.
Eligibility Checklist
The CDS is aimed at working supervisors, so the prerequisites are about field time and baseline training, not just coursework. Based on the issuer's published requirements, you need all of the following:
- Five hands-on demolition years within the last seven years.
- Eight-hour fall-protection/prevention training.
- OSHA 30 (the 30-hour course).
- Eight-hour asbestos/HAZWOPER awareness training.
- Current CPR/First Aid.
The "last seven years" framing matters. Someone with a long career who moved into estimating or sales five years ago may have trouble documenting recent hands-on time, while a younger supervisor with five solid field years does not. Application documentation requirements can change, so confirm current paperwork directly with the NDA rather than relying on any third-party summary, including this one. For a fuller walkthrough, see CDS requirements: eligibility, prerequisites and how to qualify.
Key Takeaway
Gather your training certificates and employment history before you pay the exam fee. Missing an eight-hour training record is a much cheaper problem to solve in week one than in week six.
Fees, Retakes, and Eligibility Window
| Cost or Rule | Detail |
|---|---|
| Initial exam fee (NDA member) | $595 |
| Initial exam fee (non-member) | $755 |
| CDS retake fee | $445 |
| Attempts allowed | Three within the one-year eligibility period |
| Same-window retakes | Not allowed; attempts must fall in different windows |
| After three failures | Further restrictions apply |
The $160 gap between member and non-member pricing is worth noticing if you are not yet an NDA member; compare the membership cost against that difference before you register. The full cost picture, including renewal considerations, lives in CDS certification cost: complete pricing breakdown.
The rule that surprises people is the retake structure. You cannot fail in a window and immediately try again in that same window. Since testing is offered in defined windows, a failed attempt can cost you months, not days. Review CDS exam dates, testing windows and scheduling so you know which window you are targeting and what falls back if you need a second attempt. The practical lesson: treat your first attempt as the real one. Three attempts exist as a safety net, not a plan.
The Five Domains and Their Weights
The NDA posted its exam outline on April 11, 2023. It lists five domains with approximate weights that total 100%. Treat the percentages as guides to proportion, not exact question counts.
| Domain | Name | Approx. Weight |
|---|---|---|
| 1 | SAFETY - Maintain a Safe Job Site | 32% |
| 2 | ENVIRONMENTAL - Ensure Environmental Stewardship on Every Project | 16% |
| 3 | OPERATIONAL METHODOLOGY - Ensure Effective Functioning of the Project | 19% |
| 4 | PROJECT MANAGEMENT - Ensure effective administrative set up and standard operating procedures | 15% |
| 5 | PEOPLE MANAGEMENT - Effective guidance of team members and the culture of the project | 18% |
Applied to 110 questions, those weights suggest Safety alone could account for roughly a third of your exam, and the three domains outside Safety and Operational Methodology together make up about half. That is a useful reminder that supervisors who lean on field instinct for the technical side can still lose points on administration and people topics. A deeper look at each area is in CDS exam domains: complete guide to all 5 content areas.
Safety: The 32% Domain
Domain 1: SAFETY - Maintain a Safe Job Site (32%)
This is the largest single block on the exam, and the eligibility requirements echo it: fall protection, OSHA 30, asbestos/HAZWOPER awareness, and CPR/First Aid are all prerequisites. Expect the exam to test whether you can apply that training as a supervisor, not just recite it.
- Fall protection and fall prevention on elevated work, openings, and edges of structures being taken down
- Hazard recognition before work starts and as conditions change during demolition
- Structural stability concerns: what can shift, fall, or collapse as members are removed
- Hazardous materials awareness, especially asbestos, and when work must stop or change
- Emergency response, first aid, and what a supervisor does in the first minutes of an incident
- Exclusion zones, public protection, and controlling access around the work area
- Equipment and machine safety, including spotters, swing radius, and operator communication
The supervisor's perspective is the key. A question is rarely asking what a worker should do; it is asking what the person in charge should decide, document, or stop. When two answers both sound safe, the stronger choice is usually the one that removes the hazard or stops the work rather than the one that relies on a worker to be careful.
Environmental, Operations, Project, and People
Environmental Stewardship (16%)
Domain 2: ENVIRONMENTAL - Ensure Environmental Stewardship on Every Project
Demolition touches air, water, soil, and waste streams. The supervisor is responsible for keeping the project from causing off-site harm.
- Dust and debris control, including water use and containment
- Identifying and handling regulated materials before and during demolition
- Stormwater, runoff, and keeping contaminants out of drains and neighboring property
- Waste segregation, disposal, and recycling of demolition materials
- Noise, vibration, and neighbor impact
Operational Methodology (19%)
Domain 3: OPERATIONAL METHODOLOGY - Ensure Effective Functioning of the Project
This is the "how the work actually gets done" domain, and it is the second-heaviest. It rewards real field judgment.
- Sequencing demolition so the structure stays stable and the crew stays clear
- Selecting methods and equipment appropriate to the structure and site
- Utility disconnection and verification before work begins
- Site layout, access, staging, and material flow
- Monitoring progress and adjusting when conditions differ from the plan
Project Management (15%)
Domain 4: PROJECT MANAGEMENT - Ensure effective administrative set up and standard operating procedures
The smallest domain by weight, but the one field-focused candidates most often underestimate.
- Permits, plans, and documentation required before and during work
- Standard operating procedures and keeping them consistent across the job
- Records: daily logs, inspections, incident reports, and training documentation
- Scope, schedule, and cost awareness at the supervisor level
- Coordination with owners, subcontractors, inspectors, and utilities
People Management (18%)
Domain 5: PEOPLE MANAGEMENT - Effective guidance of team members and the culture of the project
This domain treats the supervisor as a leader, not only a technician. At 18%, it carries more weight than Environmental or Project Management on their own.
- Pre-task briefings, toolbox talks, and clear communication of the plan
- Assigning work to qualified people and verifying competence
- Setting a safety culture: how you respond when someone raises a concern or bypasses a rule
- Coaching, correcting, and documenting performance issues
- Managing conflict, fatigue, and crew morale on difficult jobs
How Questions Are Likely to Feel
All 110 items are four-option multiple choice, so there are no written responses or drag-and-drop tasks to prepare for. What varies is the flavor of the question. Expect a mix of direct knowledge items (a definition, a requirement, a hazard) and situational items that describe a job-site scenario and ask for the best supervisory action.
- Read for the role. You are the supervisor. The correct answer is usually the one a responsible person in charge would choose, which often means stopping work, verifying conditions, notifying the right party, or documenting before proceeding.
- Watch absolutes. Options containing "always" or "never" deserve extra suspicion unless the topic is a true bright-line rule.
- Separate "best" from "acceptable." Several options may be defensible; you are choosing the strongest, which typically addresses the root cause rather than the symptom.
- Do not import outside assumptions. Answer from standard demolition practice and the regulations and procedures you were trained on, not from how your current employer happens to do it.
For a realistic sense of how demanding this will feel, read how hard the CDS exam is. For data on outcomes, CDS pass rate: what the data shows explains what is and is not publicly known, so you can set expectations without relying on rumors.
A Domain-Driven Review Order
Because the weights are lopsided, your calendar should be too. This is the only structured plan on this page, and it is built around the exam's own proportions rather than a generic template. Adjust the length to your timeline.
Safety foundation (32%)
- Re-read your fall-protection, OSHA 30, and asbestos/HAZWOPER materials with a supervisor's eye
- Build a list of hazards by demolition phase
- Review emergency response and incident procedures
Operational Methodology (19%)
- Work through sequencing, structural stability, and utility isolation
- Compare methods and equipment for different structure types
People Management (18%) and Environmental (16%)
- Study briefings, competence verification, and safety culture decisions
- Cover dust control, waste handling, and regulated material procedures
Project Management (15%) and full-length practice
- Review permits, records, SOPs, and coordination duties
- Take timed practice sets and revisit weak domains, starting with Safety
Safety comes first because it is the largest domain and because its concepts feed into every other area. Project Management goes last not because it matters least, but because it is the most memorization-friendly and benefits from being fresh near test day. To test yourself in exam-style format, use the CDS practice tests and focus your missed-question review on the domains where you slip. If you want to extend the plan or compress it, the CDS study guide covers pacing in more detail.
Results, Validity, and Renewal
- Results timing: Official results arrive approximately six to eight weeks after the testing window closes, not immediately after you finish. Plan around that wait.
- Validity: The credential is valid for three years.
- Renewal: Renewal depends on continuing education. The specific CEU total and renewal fee are not verified in public sources, so confirm both with the NDA when you certify and calendar a reminder well before expiration.
- Official guide: An official CDS study guide was announced in 2026. Check the NDA for its availability and whether it aligns with the April 2023 outline.
Wondering what the credential does for your career? Look at CDS jobs to see the kinds of roles where it matters, the CDS salary guide for earnings context, and whether the CDS is worth it for a return-on-investment view before you commit your time and fee.
Key Takeaway
The fastest way to waste a $595 or $755 attempt is to study evenly across all five domains. Weight your hours toward Safety and Operational Methodology first, then close the gaps in People, Environmental, and Project Management.
FAQ
The exam has 110 four-option multiple-choice questions with a 2 hour 30 minute time limit. The split between scored and unscored questions has not been publicly verified, so answer every item as if it counts.
The initial fee is $595 for NDA members and $755 for non-members. A CDS retake is $445. Confirm current pricing with the NDA before registering, since fees can change.
Safety, at about 32% of the exam, deserves the most time. Operational Methodology (19%) and People Management (18%) come next, followed by Environmental (16%) and Project Management (15%). Weights are approximate guides, not exact question counts.
No. You get three attempts within one year of eligibility, but they cannot occur within the same testing window. Further restrictions apply after three failures, so aim to be ready on your first attempt.
The issuer requires five hands-on demolition years in the last seven, eight-hour fall-protection/prevention training, OSHA 30, eight-hour asbestos/HAZWOPER awareness, and current CPR/First Aid. Confirm current documentation requirements with the NDA, and see the CDS requirements guide for more detail.