- What the 24 Content Areas Really Are
- The Two-Part Exam: Fundamentals Plus Portfolio
- Circulation, Access and Clearances (Domains 1-3)
- Work Zones and Dining (Domains 4-6)
- Fixtures, Equipment and Specialty Spaces (Domains 7-14)
- Interior Environment and Storage (Domains 15-18)
- Building Systems and Compliance (Domains 19-22)
- Universal and Sustainable Design (Domains 23-24)
- What Is and Is Not Published About Weights and Format
- Sequencing the 24 Areas Across Your Prep
- Fees, Eligibility and Retake Mechanics
- Frequently Asked Questions
- The 24 areas are NKBA's published Topics Covered list for the fifth-edition Kitchen & Bath Planning Guidelines, not official scored domains.
- CKBD requires two parts: a Fundamentals exam and a separately juried Portfolio from a real project.
- No official domain weights exist, so no domain can be verified as the largest.
- The eight portfolio PDFs are deliverables, not exam domains.
What the 24 Content Areas Really Are
If you have searched for the "CKBD exam domains," you have probably seen lists that present 24 neatly weighted categories, as though the National Kitchen & Bath Association published a scoring blueprint. It has not. The 24 areas in this guide come from the public Topics Covered list for the fifth-edition NKBA Kitchen & Bath Planning Guidelines, the reference that the Certified Kitchen and Bath Designer (CKBD) Fundamentals Exam explicitly tests.
That distinction shapes how you should study. These are reference-preparation topics: headings that tell you what the planning guidelines cover and, therefore, what you should be able to apply in scenarios. They are not a guarantee of how many questions appear on any given topic, and they are not an exhaustive exam blueprint. Treat them as the best public map of the terrain, nothing more and nothing less.
The Two-Part Exam: Fundamentals Plus Portfolio
The CKBD credential is earned in two separate pieces, and the 24 topics apply to only one of them.
Fundamentals Exam
The Fundamentals Exam tests your understanding and application of the NKBA Kitchen & Bath Planning Guidelines in scenario form. That phrase is the most useful clue about question style: you are expected to apply the guidelines to design situations, not merely recite clearance numbers. The current question count, item format, scored/unscored split, numerical time limit and passing cutoff are not verified in public sources, so older specifications you may see quoted elsewhere should not be treated as current. For what is and is not known about scoring, see CKBD Passing Score 2026.
Portfolio Exam
The Portfolio Exam is juried by NKBA-certified portfolio reviewers. You submit a real kitchen and bath project on which you served as designer of record, prepared to NKBA Graphic & Presentation Standards. The deliverables are eight PDFs: for the kitchen, drawings, specifications, a design statement and before/after photographs, plus the same four deliverables for the bath.
You must pass both parts within one year. That one-year window is an administrative access limit, not an exam timer. If you are weighing how demanding the whole path is, How Hard Is the CKBD Exam? covers the difficulty picture in more depth.
Circulation, Access and Clearances (Domains 1-3)
The first three topics establish how people physically move through and use a space. They tend to reward precision, because scenario questions often hinge on whether a layout meets a minimum clearance or a clear-space requirement.
Domain 1: Egress & Passageways
How occupants move through the kitchen and bath, and how routes stay safe and unobstructed.
- Walkway and work-aisle relationships in a planned layout
- How traffic patterns interact with work zones
- Egress considerations that overlap with fire and life-safety locations
Domain 2: Doorways & Hardware
Door sizing, swing and hardware choices that affect access and use.
- Door swings that collide with fixtures, appliances or other doors
- Hardware selection that supports ease of operation
- Connections to accessible planning with wheelchairs and mobility aids
Domain 3: Clear Floor Spaces
The unobstructed floor area needed at fixtures and appliances.
- Positioning clear space so it is genuinely usable, not just technically present
- Overlap rules between adjacent clear spaces
- How clear floor space supports both standing and seated users
A practical note: because the fifth edition ties into the 2024 International Residential Code and CSA B652 Accessible Dwellings (2023), with comparison to the National Building Code of Canada, you should be comfortable noticing where guideline language and code language meet. Candidates who memorize numbers without understanding the intent behind them usually struggle when a scenario changes one variable.
Work Zones and Dining (Domains 4-6)
Domain 4: Primary Activity Centers
The core kitchen work zones, such as cleanup, cooking, preparation and storage, and how they relate to one another.
- Placing centers so work flows logically rather than forcing cross-traffic
- Counter and landing-area planning around each center
Domain 5: Secondary Activity Centers
Supporting zones such as additional prep, baking, beverage or planning stations.
- Adding secondary centers without compromising primary-zone workflow
- Scaling secondary centers to the household's actual habits
Domain 6: Seating Areas for Dining
Eating spaces integrated into or adjacent to the kitchen.
- Seating clearances relative to counters, islands and traffic paths
- Accommodating a range of users, including seated mobility-device users
These topics reward designers who think in terms of use. Scenario questions in this territory typically present a client's needs and a proposed layout, then ask what is wrong or what would improve it. Working through real floor plans, and critiquing them against the guidelines, is far more effective than flashcards alone. The CKBD Study Guide outlines how to build that kind of applied practice into your routine.
Fixtures, Equipment and Specialty Spaces (Domains 7-14)
This is the widest stretch of the list, covering specific fixtures, appliances and room types beyond the standard kitchen and bath.
| Domain | Core Concern | Typical Scenario Angle |
|---|---|---|
| 7: Kitchen Fixtures & Fittings | Sinks, faucets and related fittings | Placement and clearances at the cleanup zone |
| 8: Kitchen Equipment | Cooking, refrigeration and cleanup appliances | Appliance placement, landing areas, ventilation links |
| 9: Bathroom Fixture & Fittings | Toilets, lavatories, tubs, showers | Fixture clearances and accessible reach |
| 10: Laundry Equipment | Washer, dryer and associated space | Fit, access and utility connections |
| 11: Clothing Storage | Closets and dressing-adjacent storage | Reach ranges and organization |
| 12: Home Offices & Gyms | Specialty home spaces | Layout, power and comfort needs |
| 13: Outdoor Kitchens | Exterior cooking spaces | Equipment, utilities and weather exposure |
| 14: Outdoor Baths | Exterior bathing and shower areas | Privacy, drainage and material choices |
The outdoor topics (13 and 14) and the home office/gym topic (12) are the ones candidates most often underestimate, precisely because they feel peripheral to a traditional kitchen-and-bath career. Because the public list names them explicitly, give each at least a focused review pass, even though their relative scoring importance is unknown.
Key Takeaway
For the fixture and equipment topics, study each item as a relationship, not an object: what clear space does it need, what utilities does it require, what ventilation or power does it trigger, and who must be able to use it? That four-question habit connects Domains 7-14 to the rest of the list.
Interior Environment and Storage (Domains 15-18)
The fifth-edition reference description highlights a cluster of interior-environment guidance: wall blocking and bracing, storage systems, counter bracing, flooring, tile slip ratings, indoor air quality, sustainable materials, energy and water conservation, comfort and acoustics. Several of these map onto the topic headings below.
Domain 15: Cabinetry & Casework
Construction, configuration and installation considerations for cabinetry.
- Wall blocking and bracing needed to support cabinetry and counters
- Counter bracing for overhangs and seating areas
Domain 16: Finishes & Materials
Surface selections and their performance characteristics.
- Flooring choices and tile slip ratings
- Sustainable material considerations
- Comfort and acoustic effects of finish selections
Domain 17: Functional Storage
Storage systems that match how people actually use the space.
- Accessible reach and organization
- Matching storage type to the items and the user
Domain 18: Indoor Air Quality
Keeping the air healthy where cooking, bathing and cleaning generate moisture, odors and pollutants.
- Ventilation as a health measure, not just a comfort feature
- Material and product choices that affect air quality
These topics sit at the junction of design and building science. Designers with a strong aesthetic background sometimes treat blocking, bracing and slip ratings as a contractor's problem, but the guidelines treat them as planning responsibilities.
Building Systems and Compliance (Domains 19-22)
The reference's building-system guidance covers smart-home controls, illumination and lighting controls, kitchen-island power, kitchen and bath ventilation calculations, and fire/life-safety locations. Those themes distribute across the final stretch of the list.
Domain 19: Electrical Planning
Circuits, receptacles and power needs across the kitchen and bath.
- Kitchen-island power planning
- Smart-home control integration
Domain 20: Lighting Planning
Layered illumination and lighting controls.
- Task, ambient and accent lighting working together
- Controls that suit the user and the space
Domain 21: Systems Coordination
Making plumbing, electrical, mechanical and structural decisions work together.
- Anticipating conflicts between ventilation routes, cabinetry and structure
- Coordinating trades through accurate drawings and specifications
Domain 22: Code Compliance
Applying the codes the guidelines reference.
- The fifth edition's linkage to the 2024 International Residential Code and CSA B652 Accessible Dwellings (2023)
- Comparison with the National Building Code of Canada
- Kitchen and bath ventilation calculations and fire/life-safety locations
Universal and Sustainable Design (Domains 23-24)
Domain 23: Universal Design
Planning spaces that work for people across a wide range of abilities and ages.
- Accessible planning with wheelchairs, mobility aids and grab bars
- Blocking in walls so grab bars can be added or installed safely
- Choosing solutions that serve everyone without looking institutional
Domain 24: Sustainable Design
Reducing environmental impact through material and system choices.
- Energy and water conservation strategies
- Sustainable materials and indoor air quality connections
Universal design and sustainability are cross-cutting themes rather than isolated chapters. Expect them to surface inside scenarios about fixtures, finishes, ventilation and layout, so review them last, after you understand the individual components they influence.
What Is and Is Not Published About Weights and Format
Candidates naturally want to know where to concentrate effort. Here is the honest state of public information:
| Item | Status |
|---|---|
| Official scoring weights for the 24 topics | Not published |
| Largest scored domain | Unpublished; no verified numerical largest domain |
| Current Fundamentals question count and scored/unscored split | Unverified |
| Timed duration and numerical cut score | Unverified |
| Open-book, calculator, adaptive and live-proctor rules | Unverified |
| Pass rate | Not publicly disclosed |
Older figures, such as 100- or 200-question counts and four-hour limits, circulate online, but they should not be assumed to describe the current bundle. Always confirm current exam rules directly with NKBA before test day. For what we can and cannot say about outcomes, read CKBD Pass Rate 2026: What the Data Shows.
The practical conclusion: because no domain can be called the heaviest, a balanced plan beats a gambling plan. Build competence across all 24 topics, then deepen the ones where your own experience is thinnest.
Sequencing the 24 Areas Across Your Prep
Rather than a generic study schedule, sequence the topics by how they build on each other. This example assumes you are working through the fifth-edition reference alongside practice scenarios.
Foundations of Movement and Access
- Domains 1-3: egress, doorways, clear floor spaces
- Sketch three layouts and check clearances against the guidelines
Work Zones and Dining
- Domains 4-6: primary and secondary centers, seating
- Critique a floor plan for flow and conflicts
Fixtures, Equipment and Specialty Spaces
- Domains 7-14, grouped by kitchen, bath, laundry, storage and outdoor
- Give extra time to the outdoor and home-office topics
Materials, Systems and Code
- Domains 15-22: casework, finishes, air quality, electrical, lighting, coordination, code
- Practice ventilation and power scenarios
Cross-Cutting Themes and Review
- Domains 23-24: universal and sustainable design
- Mixed scenario sets across all 24 topics
Start the Portfolio in parallel, not after. Because you must pass both parts within one year, choose your showcase project early and confirm you can produce all eight PDFs to NKBA Graphic & Presentation Standards. A quick reference to condense your notes is the CKBD Cheat Sheet, and you can pressure-test your readiness with the CKBD practice tests.
Fees, Eligibility and Retake Mechanics
Knowing the administrative rules prevents costly surprises.
- Bundle fee: $950 in the U.S., covering both the Fundamentals and Portfolio components. Current NKBA membership is required, and no non-member exam tier is published.
- Completion window: You must pass both parts within one year.
- Retakes: One retake of each part is included. Later attempts cost $195 for Fundamentals and $295-$395 for the Portfolio. Waits are 14 days for the first Fundamentals retake and 30 days for the first Portfolio retake, then 30 days thereafter.
- Reactivation: $450 grants six months, subject to the deadline and eligibility.
- Maintenance: 20 approved hours (2.0 CEUs) every two years. The renewal fee total is unverified.
Eligibility Pathways
You qualify through one of three routes:
- An NCIDQ or architect credential.
- 30 relevant academic credits plus three years of industry experience, including one year as a designer.
- Seven years of industry experience, including three as a designer. This industry route is effective June 1, 2026.
Documentary evidence and references apply. For the full picture, see CKBD Requirements 2026, and for the cost side of the ledger, CKBD Certification Cost 2026. If you are still deciding whether the investment fits your career, Is the CKBD Certification Worth It? walks through that question.
Frequently Asked Questions
No. They are the public Topics Covered list for the fifth-edition NKBA Kitchen & Bath Planning Guidelines, the reference the Fundamentals Exam tests. They are unweighted preparation topics, not an official scoring blueprint or an exhaustive exam outline.
That is not published. NKBA has not released scoring weights, so there is no verified largest domain. Prepare across all 24 topics and spend extra time wherever your professional experience is weakest.
No. They are deliverables for the juried Portfolio Exam: kitchen drawings, specifications, design statement and before/after photos, plus the same four for the bath. They are submission requirements, not written-exam content areas or scored weights.
The current question count, item format, scored/unscored split, time limit and passing cutoff are unverified in public sources. Older specifications seen online should not be assumed current, so confirm details with NKBA before scheduling.
One retake of each part is included in the $950 bundle. Later attempts cost $195 for Fundamentals and $295-$395 for the Portfolio, with waiting periods between attempts. Both parts must still be passed within the one-year window unless you pay for reactivation.
The 24 areas give you a dependable map of what the CKBD Fundamentals Exam draws on, but the map is not a weighted blueprint, and the Portfolio is a separate challenge entirely. Study the guidelines as connected design logic, begin your portfolio early, and verify current exam rules with NKBA. For deeper context on the credential itself, explore What Is CKBD? and the CKBD Exam Prep practice site.