ID POST
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Cheat sheet
Keep the key ideas within reach.
ExploreKey terms
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ExploreStudy plan
Give each week a clear focus.
ExploreCommon mistakes
Understand the traps and how to avoid them.
ExploreCase studies
Put your knowledge to work in context.
ExploreExam-day guide
Prepare for the day ahead.
ExploreAbout this exam
ID POST is a professional credential for interior designers who work on residential projects. It signals that the holder can take a home interior from initial client brief through programming, space planning, detailing, specification, and project administration. The exam is aimed at designers with practical residential experience who want third-party validation of their technical and professional judgment, and at firms that want a benchmark for staff competence. Coverage spans eight areas: residential programming and space planning; building systems, construction, and interior detailing; codes, regulations, and life safety; materials, finishes, furnishings, and specification; lighting, acoustics, and environmental comfort; kitchen and bath design; business practices and contract administration; and professional ethics, communication, and client relations. The exam is multiple choice, and the official body publishes the current question count, time limit, fee, passing score, retake policy, and validity period on its own site, so check there for figures rather than relying on secondhand sources. To prepare, build a study plan weighted to the domain percentages, with the largest share going to programming and space planning, and cluster codes and kitchen/bath content because they overlap on clearances and ventilation. Work through residential case studies end to end, practice reading plans and interpreting specifications, and rehearse the business and ethics material with short scenario questions. This page is an independent study resource and is not affiliated with or endorsed by the certifying organization.
What you'll study
About ID POST preparation
What is the ID POST exam format?
It is delivered as multiple choice. The official body publishes the current number of questions, the time allowed, and whether any sections are weighted differently; confirm those details on its site before you schedule, since they can change between exam cycles.
How hard is the exam?
Difficulty comes from breadth rather than trick questions. Candidates with real residential project experience usually find the planning and materials items familiar, while codes, structural coordination, and business administration demand deliberate study. Weak spots are typically numerical clearances and contract terminology.
What score do I need to pass, and how much does it cost?
Those figures are set and published by the official certifying body. This page does not quote them because they change. Check the official site for the current passing score, exam fee, and any rescheduling fees before you book.
Can I retake the exam if I fail?
Retake rules, waiting periods, and any additional fees are set by the official body and are published on its site. Plan to review your score report by domain before rebooking, because it usually shows where you lost ground and that should drive your second study cycle.
In what order should I study the domains?
Start with programming and space planning, since it frames every later decision. Then take building systems and codes together, because wall types, clearances, and egress overlap. Move to materials and kitchen/bath, then lighting and acoustics, and finish with business practices and ethics.
Why are codes and kitchen/bath design worth studying together?
Both hinge on dimensions: counter and aisle clearances, ventilation, electrical receptacles near water, stair and egress geometry, and grab bar blocking. Studying them as one block means you learn each number once and can apply it in either context on exam day.
What trips candidates up most often?
Three patterns: memorizing dimensions without understanding why they exist, ignoring the business and ethics domains because they feel less technical, and failing to practice reading drawings and specifications quickly. Scenario questions reward judgment, so drill application rather than recall alone.
How should I prepare in the final weeks?
Take timed practice sets under exam conditions, then review every wrong answer by domain. Rebuild a one-page sheet of clearances, code thresholds, and contract terms you keep missing. Stop learning new material in the last few days and consolidate instead.
Is this page affiliated with the certifying organization?
No. This is an independent study resource written for candidates searching for the exam. It is not affiliated with, endorsed by, or sponsored by the certifying body, and official policies and figures should always be confirmed on that organization's own site.