Most states split the contractor's exam into two parts: a trade or technical exam on how the work is actually done and the building code, and a Business and Law exam on contracts, licensing law, liens, safety, taxes, and running a company. Many are open-book but tightly timed, so the real skill is fast, accurate reference, not memorizing everything. Plenty of good trades people fail, and it is usually the Business and Law half that gets them, because they know how to build but not the paperwork behind the business. The exact format, provider, question count, and pass mark are set by your state, so route those to the Contractor License Checker and study the specific references your state names.
The two exams
Almost everywhere, the exam is really two exams, and you often have to pass both:
- The trade or technical exam. This covers how to do the work correctly and to code: methods, materials, safety, blueprint reading, and the code sections that govern your classification. If you are a general building contractor, expect broad coverage; if you are a specialty trade, expect it focused on that trade.
- The Business and Law exam. This covers the side of the business that has nothing to do with swinging a hammer: contracts, licensing law, lien and payment rules, employment and safety obligations, insurance and bonding, and basic bookkeeping and tax. This is the one that catches experienced trades people off guard.
Which exact topics and weightings apply are set by your state's board, so confirm the content outline for your classification before you study.
The NASCLA option
Several states accept the NASCLA Commercial General Building Contractor exam in place of their own trade-knowledge exam. It is a single accredited exam of 115 questions over about five and a half hours, open-book, with a 70% pass mark, and passing it once can satisfy that step in every state that accepts it. That is a real advantage if you plan to work across state lines. Note what it does not do: it does not replace a state's own Business and Law exam, and it does not license you by itself. You still apply, pay, bond, and clear a background check in each state. Whether your state accepts NASCLA, and for which classifications, routes to the current participating-states list.
Open-book does not mean easy
A lot of contractor exams are open-book, which sounds like a gift and is not. You are allowed approved references, but you are racing the clock, and if you have to read a code book cold for every question you will run out of time long before you run out of questions. The people who pass open-book exams comfortably have prepared their books: tabbed, highlighted, and indexed so they can land on the right section in seconds. The exam is testing whether you can find and apply the right rule fast, which is exactly the skill the job needs.
How to prepare
Preparation is less about cramming and more about knowing the material and your references:
- Get your state's exam content outline and approved reference list. Study the books they actually test from, in the editions they specify, because code editions differ by state and using the wrong one loses you points.
- Tab and index your reference books if the exam is open-book, so you can navigate under time pressure.
- Drill practice questions to get used to the format and the pace, and to find your weak spots.
- Do not neglect the Business and Law half. This is where prepared trades people lose, so give it real time even though it feels less familiar than the trade content.
- Consider a prep course if the Business and Law material or the code is new to you. It is not required, but it can shorten the path.
The specific references, editions, and providers are all state-specific, so build your study plan around your state's list, not a generic one.
Why the Business and Law half is where people fail
The trade exam tests what you already do every day, so experienced contractors often pass it on knowledge alone. The Business and Law exam tests things a working trades person may have never had to formalize: how a contract has to be written, what your lien and notice deadlines are, what you owe employees, how bonding and insurance work, and what the tax rules are. It is not harder than the trade, it is just unfamiliar, and unfamiliar under a timer is where scores drop. Treat it as a subject to learn, not common sense to wing, and it stops being the wall it is for so many people. A lot of that same material, contracts, liens, getting paid, taxes, and insurance, is covered across the rest of SiteKiln, so it is worth reading up before you sit it.
Common questions
Is the contractor's license exam open book?
In many states, yes, but open-book does not mean easy. You are usually allowed approved reference books, but the exam is tightly timed, so you cannot afford to read from scratch on every question. People who pass comfortably arrive with tabbed, indexed books and know where to find each rule fast. Whether your specific exam is open-book, and which references are allowed, are set by your state, so confirm in the Contractor License Checker.
How hard is the contractor's license exam?
It is passable with real preparation, and the part that fails experienced trades people is usually the Business and Law half, not the trade. The trade exam tests what you already do; the Business and Law exam tests contracts, liens, licensing law, insurance, and taxes, which are unfamiliar to a lot of working contractors. Pass rates, question counts, and the pass mark are set by your state and vary, so do not assume from another state. Prepare both halves and the exam becomes manageable.
What's on the Business and Law exam?
Contracts, licensing law, lien and payment rules, employment and safety obligations, insurance and bonding, and basic bookkeeping and taxes. It is the business side of running a contracting company rather than the hands-on trade. This is the section that catches skilled trades people off guard because it is unfamiliar, not because it is harder. The exact topics and weighting are set by your state's board, so get the content outline for your classification and study it directly.
Can I use the NASCLA exam instead of my state's trade exam?
In the states that accept NASCLA, yes, it can replace the trade-knowledge exam, but not the whole licensing process. The NASCLA exam is a single national test of 115 questions, open-book, with a 70% pass mark, and passing it once counts in every participating state. It does not replace a state's Business and Law exam and does not license you by itself. You still apply, bond, insure, and clear a background check in each state. Check the current participating-states list before relying on it.
Do I have to take a prep course to pass?
No, a prep course is not required, but it can help if the code or the Business and Law material is new to you. Plenty of people self-study using the state's approved reference list and practice questions. The value of a course is structure and speed, not a secret, so weigh it against how comfortable you already are with the material. Either way, study the specific references and editions your state names, not a generic set.
The honest bit
- Exam providers, question counts, pass marks, fees, and required code editions are all set by your state and change over time. This guide teaches the structure and does not card any state's exam details. The only hard numbers here are the NASCLA exam's own format, because NASCLA is a single national exam, and even that can be updated, so confirm it on current NASCLA materials.
- Get your state's exam content outline, approved reference list, and code editions from the Contractor License Checker and your state board's own .gov page before you build a study plan.
- This is general guidance, not legal or licensing advice. Study from your state's official materials, because that is what the exam is written from.
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