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9 Best Home Inspector Certifications of 2026
This list is for people who are starting a home inspection career and want to know which credential, exam or training school to pay for first. We compared documented requirements and published prices for nine options: association credentials such as InterNACHI CPI and ASHI Certified Inspector, the National Home Inspector Examination used by many state licensing boards, pre-licensing schools such as AHIT and ICA School, code and radon credentials, and one advanced designation for later in your career. Scores weigh features at 40 percent and ease of use and value at 30 percent each. A state license, where your state requires one, always comes before any private certification.
By the Mojolin research desk · Updated November 10, 2026 · 9 tools compared · Prices checked on vendor pages, latest November 10, 2026
Questions or corrections: editorial@mojolin.com
Mojolin is self-funded How we score
InterNACHI CPI is our top pick because a new inspector can join for $49 a month, take a long list of free online courses, pass the online inspector exam and use the CPI credential without paying a separate school. The National Home Inspector Examination is the credential that carries the most weight with regulators, since 35 states and several Canadian provinces use it, and it is also required for ASHI membership. If your state requires classroom hours or field training, pair the exam with a school: AHIT starts at $699 online and ICA School at $795 with report software included. ASHI Certified Inspector is the stronger credential once you have 250 paid inspections behind you, and IAC2, NRPP and ICC credentials are useful add-ons for mold, radon and code work.
Top picks
Best overall
InterNACHI Certified Professional Inspector (CPI)
9.1 / 10
New inspectors who want a recognized credential and a full training library for one low membership fee.
Read the review →Runner-up
National Home Inspector Examination (NHIE)
8.6 / 10
New inspectors in states that require the exam, and anyone planning to join ASHI later.
Read the review →Also great
AHIT (American Home Inspectors Training)
8.5 / 10
New inspectors who want a state-tailored course and lifelong instructor support.
Read the review →Comparison table
| # | Tool | Pricing | Score | |
|---|---|---|---|---|
| 1 | InterNACHI Certified Professional Inspector (CPI) | New inspectors who want a recognized credential and a full training library for one low membership fee. | See vendor pricing (USD check pending); InterNACHI lists membership at $49 per month or $499 per year | 9.1 |
| 2 | National Home Inspector Examination (NHIE) | New inspectors in states that require the exam, and anyone planning to join ASHI later. | $225 per test in most states and in Canada; some states set their own fee | 8.6 |
| 3 | AHIT (American Home Inspectors Training) | New inspectors who want a state-tailored course and lifelong instructor support. | Online course from $699; live classes priced by state | 8.5 |
| 4 |  ICA School | New inspectors who want report software and an InterNACHI membership bundled with training. | See vendor pricing (USD check pending); ICA lists packages from $795 (Foundation) to $1,495 (Elite) | 8.4 |
| 5 |  ASHI Certified Inspector (ACI) | Inspectors with a few years of paid inspections who want an independently accredited credential. | ASHI membership $499 per year, or $49.16 per month plus a $91 monthly plan fee; ACI application fee $499 | 8.2 |
| 6 |  IAC2 Mold and Radon Certification | Home inspectors who want a low-cost mold or radon credential to add to their services. | $99 per year standard membership; $1 per year for InterNACHI members with a coupon code | 7.9 |
| 7 |  ICC Residential Building Inspector (B1) | Inspectors who want to prove code knowledge or move toward municipal building inspection. | See vendor pricing (USD check pending); the price depends on code cycle and exam format | 7.7 |
| 8 |  NRPP Radon Measurement Certification | Home inspectors who want to offer radon testing in states or deals that require recognized certification. | Radon Measurement Field Technician exam $125, Radon Measurement Professional exam $175; certification $250 to $325 | 7.6 |
| 9 |  Certified Master Inspector (CMI) | Inspectors with at least three years in business who want a senior designation with no annual dues. | See vendor pricing (USD check pending); a one-time application fee with no annual dues | 7.3 |
Scoring weights
Every tool gets three editorial scores out of 10, from vendor documentation, product pages and the published price. The overall score is the weighted average below, the same method on every list. Full method
The full ranking
Rank 1 · Best overall
InterNACHI Certified Professional Inspector (CPI)
A federally registered certification mark from the largest home inspector association, earned through free online courses and an online inspector exam.
nachi.org9.1
out of 10
Best for: New inspectors who want a recognized credential and a full training library for one low membership fee.
InterNACHI's CPI credential is the most practical first certification for someone new to the field. The International Association of Certified Home Inspectors is a nonprofit trade association that represents more than 20,000 inspectors, and its Certified Professional Inspector mark is registered with the US Patent and Trademark Office. To earn it you join, complete a set of free online courses covering safe practices, roofing, electrical, plumbing, HVAC, structure, exteriors, interiors, decks, moisture and fireplaces, and pass the Online Inspector Exam. Membership costs $49 a month, which you can cancel at any time, or $499 a year, and it includes unlimited access to the training library, practice questions and the members forum. The catch is that the credential lives only as long as your membership does, and you must log 24 hours of continuing education each year and pass the exam again every three years. It also does not replace a state license, so check your state's rules first.
Standout feature
One membership covers the training library, the inspector exam and a federally registered certification mark.
Use cases
Career changers in states without licensing
Complete InterNACHI's free courses and pass the Online Inspector Exam
Outcome: A recognized credential to market from the first inspection
Licensed new inspectors
Use the membership library for yearly continuing education
Outcome: Renewal hours without buying separate CE courses
Key features
- Certified Professional Inspector (CPI) is a federally registered certification mark
- Membership includes unlimited free online training and continuing education
- Online Inspector Exam and free practice questions included
- Free online courses on roofs, electrical, plumbing, HVAC, structure and more
- InterNACHI School is accredited by ACCET, a Department of Education recognized agency
Pros
- Training, exam and credential all included in one membership
- Monthly plan can be canceled at any time
- Large library of free continuing education for renewals
Cons
- Certification ends if you cancel your membership
- You must pass the online exam again every three years with 80 percent or better
- Does not replace a state license where one is required
Rank 2 · Runner-up
National Home Inspector Examination (NHIE)
The independent home inspector competency exam from the Examination Board of Professional Home Inspectors, used for licensing in many states.
nationalhomeinspectorexam.org8.6
out of 10
Best for: New inspectors in states that require the exam, and anyone planning to join ASHI later.
The National Home Inspector Examination is not a certification you can earn on your own in the same way as an association credential, but it is the test that matters most for a licensed career. The Examination Board of Professional Home Inspectors builds and maintains it, and because the board is not a membership organization it presents the exam as free of association bias. The NHIE has 200 multiple-choice questions, 25 of them unscored pretest items, and you get four hours at one of more than 300 testing centers. It covers inspection methods, reporting, all major building systems and professional practice. Thirty-five states and several Canadian provinces use it for regulation, and ASHI and other associations require it for membership. The fee is $225 per test in most states, though Florida, Illinois, Nevada, Oklahoma, South Dakota, Tennessee and Washington route candidates through their own administrators. You still need a course to prepare.
Standout feature
The exam used for home inspector regulation in 35 states, at $225 per test in most of them.
Use cases
Candidates in licensing states
Pass the NHIE after completing state pre-licensing hours
Outcome: The exam result needed for the state license application
Inspectors aiming for ASHI
Pass the exam early in their career
Outcome: One requirement of ASHI Certified Inspector already met
Key features
- 200 multiple-choice questions, 175 of them scored, with four hours to finish
- Offered at more than 300 testing centers in the US and Canada
- Used for home inspector regulation in 35 states and several Canadian provinces
- Required for membership in ASHI and several other associations
- Official study manuals and paid practice quizzes available
Pros
- Most widely used exam for state licensing
- Run by an independent board that is not a membership group
- Reimbursed by the US Veterans Administration
Cons
- It is an exam, not a course, so you still need training
- Several states require you to test through their own administrator
- Each retake needs a new fee
Rank 3 · Also great
AHIT (American Home Inspectors Training)
A home inspection school offering state-specific pre-licensing courses online and in live classes with field training.
ahit.com8.5
out of 10
Best for: New inspectors who want a state-tailored course and lifelong instructor support.
AHIT is one of the longest-running home inspection schools, training inspectors since 1993 and reporting more than 76,000 graduates. Its online course starts at $699 and is self-paced, with video lessons and GoPro footage from real inspections, and AHIT says you can finish in as little as three weeks. Live classes add field training in real homes and dedicated time with working inspectors, and both formats are customized by state so the hours count toward licensing. What sets AHIT apart is support after the course: graduates get unlimited technical and business help from instructors for their whole career, and the curriculum includes how to start and market an inspection business. ASHI points new members to AHIT as its partner educator. AHIT is a training provider rather than a credential, so you still sit your state exam or the NHIE and can then add an association certification.
Standout feature
Graduates get unlimited instructor support for their entire inspection career.
Use cases
Career changers in licensing states
Complete state-approved pre-licensing hours online
Outcome: Eligibility to sit the state exam or the NHIE
Hands-on learners
Attend a live class with field training
Outcome: Practice inspecting real homes before the first paid job
Key features
- Self-paced online course that can be finished in as little as 3 weeks
- Video lessons and GoPro footage of real home inspections
- Live classes with extra field training in real homes
- Courses customized by state to meet licensing requirements
- Business and marketing training plus unlimited lifetime support
Pros
- In business since 1993 with more than 76,000 inspectors trained
- Unlimited technical and business support for your whole career
- ASHI names AHIT as its partner educator
Cons
- Starting price is above InterNACHI's monthly membership
- Live class schedules depend on your state
- Training only; the credential comes from your state or an association
Rank 4
ICA School
An online and live home inspection school with all-inclusive packages that bundle report software, exam prep and bonus courses.
icaschool.com8.4
out of 10
Best for: New inspectors who want report software and an InterNACHI membership bundled with training.
ICA School sells home inspector training as all-inclusive packages, starting with the $795 Foundation plan and rising to $995 for Premier and $1,495 for Elite. Every package includes lifetime access to a narrated online course, career-long support from experienced inspectors and Report Form Pro Nitro report software, which ICA values at $399. Exam prep runs to more than 700 practice questions for the national or state exam, and a bonus library covers topics such as thermal imaging, pool and spa inspection, termites and building a business. The upper packages add a year of InterNACHI membership, two NHIE study e-books, mold and radon certification courses and ICA's Elite Inspector badge, which makes Elite a bundle of training plus first credentials. Live classes run in 17 states. ICA is a school, so your license still depends on your state's exam, and the Foundation price is higher than AHIT's entry course.
Standout feature
Every package includes lifetime report software, which ICA values at $399.
Use cases
New inspectors starting a business
Buy one package that includes training, report software and exam prep
Outcome: Ready to write reports without buying separate software
Inspectors who want add-on services
Take the mold and radon courses in the Elite package
Outcome: Extra services to sell alongside each inspection
Key features
- Lifetime access to the online course with narrated video classes
- Report Form Pro Nitro report software included for life
- 700+ practice questions for national and state exams
- Live classes in 17 states
- Higher packages add NHIE study e-books, mold and radon courses and a year of InterNACHI membership
Pros
- Report software included at no extra charge
- Bonus courses on thermal imaging, pool and spa, termites and business building
- Covers US states and Canadian provinces
Cons
- Foundation package costs more than AHIT's starting price
- The most useful extras sit in the $995 and $1,495 packages
- Live classes are limited to 17 states
Rank 5
ASHI Certified Inspector (ACI)
The American Society of Home Inspectors' top credential, accredited by the National Commission for Certifying Agencies.
homeinspector.org8.2
out of 10
Best for: Inspectors with a few years of paid inspections who want an independently accredited credential.
ASHI Certified Inspector is the most demanding credential on this list, which is why it ranks below options a beginner can earn right away. The American Society of Home Inspectors requires candidates to pass the National Home Inspector Examination, complete 250 fee-paid inspections that follow the ASHI Standard of Practice, submit five reports for review and earn 20 continuing education credits each year. In return, the program has been accredited by the National Commission for Certifying Agencies since 2009, with the current accreditation valid until 2029, and ASHI counted 1,758 ACIs at the end of 2025. New inspectors can still join as Associate members, use the ASHI Edge education hub with free member courses, attend chapter meetings and get a $250 saving on first-year insurance through the member program. Membership is $499 a year, or $49.16 a month plus a $91 yearly fee for the monthly plan, and the ACI application costs another $499.
Standout feature
The ACI program itself is accredited by the National Commission for Certifying Agencies.
Use cases
Inspectors in their second or third year
Submit 250 inspections and five reports for ACI review
Outcome: An NCCA-accredited credential to show agents and clients
Brand new inspectors
Join as an Associate member
Outcome: Education, mentorship and chapter networking before qualifying for ACI
Key features
- ACI credential accredited by the NCCA since 2009, valid until 2029
- Requires passing the NHIE and 250 fee-paid inspections
- Five reports reviewed against the ASHI Standard of Practice
- The ASHI Edge education hub with free courses for members
- Find an Inspector directory listing and local chapters
Pros
- Only credential on this list with NCCA accreditation of the program
- Associate membership lets new inspectors join before they qualify
- Member insurance program saves first-year inspectors $250
Cons
- 250 paid inspections are needed before you can apply for ACI
- Membership and ACI application each cost $499
- Monthly dues carry a $91 yearly fee
Rank 6
IAC2 Mold and Radon Certification
A certifying body for mold inspectors, radon testers and other indoor air specialists, open to inspectors with qualifying education.
iac2.org7.9
out of 10
Best for: Home inspectors who want a low-cost mold or radon credential to add to their services.
The International Association of Certified Indoor Air Consultants is a cheap way for a new inspector to add mold or radon testing to the menu. IAC2 certifies mold inspectors, mold testers, radon testers and radon mitigation inspectors, and it requires proof of a qualifying indoor air quality course with your application. The recommended courses include InterNACHI's free online mold, advanced mold, advanced radon and indoor air quality courses, so the education can cost nothing. Standard membership is $99 a year, and InterNACHI members pay $1 a year with a coupon code, which makes it an easy add-on to a CPI membership. You must keep your membership current and follow IAC2's Standards of Practice. IAC2 is clear that it is a private trade group, not a government agency, so check whether your state requires a separate license for mold or radon work before you advertise those services.
Standout feature
InterNACHI members can hold IAC2 certification for $1 a year.
Use cases
New InterNACHI members
Take the free mold course and apply to IAC2 for $1 a year
Outcome: A mold credential to list alongside home inspections
Inspectors in states without radon licensing
Complete the advanced radon course and certify with IAC2
Outcome: Radon testing added as an extra service
Key features
- Certification for mold inspection, mold testing, radon testing and radon mitigation inspection
- Accepts InterNACHI's free online mold, radon and indoor air quality courses as qualifying education
- Published Mold Inspection and Radon Mitigation System Inspection Standards of Practice
- Find a Consultant directory for clients
- Online verification of a consultant's certification
Pros
- Cheapest credential on the list
- Qualifying courses can be taken free online
- Discounted $1 yearly rate for InterNACHI members
Cons
- A private trade group, not a state license
- Certification ends if membership lapses
- Narrow scope compared with a full home inspection credential
Rank 7
ICC Residential Building Inspector (B1)
The International Code Council's national certification exam for inspecting residential construction against the building code.
iccsafe.org7.7
out of 10
Best for: Inspectors who want to prove code knowledge or move toward municipal building inspection.
The ICC B1 Residential Building Inspector certification comes from the International Code Council, the group behind the International Residential Code that most US jurisdictions adopt. It is not a home inspection credential in the usual sense, since it tests whether you can judge construction against code rather than how to write a pre-purchase inspection report, but it is a strong signal of technical knowledge. The exam has 60 questions and a two-hour limit, you choose the code cycle and testing format when you buy it, and remote testing is available through ICC's PRONTO platform. Exam purchases are final and valid for 365 days, and you can make six attempts in six months, paying the fee each time. For a new home inspector, B1 is most useful as a second credential, or as a step toward a job with a city or county building department where ICC certification is often expected.
Standout feature
The national code credential behind many building department inspector jobs.
Use cases
Inspectors with construction backgrounds
Pass the B1 exam on the current residential code
Outcome: A code credential that sets their reports apart
Inspectors eyeing public sector work
Earn B1 as a first ICC certification
Outcome: A qualification building departments recognize
Key features
- 60-question exam with a two-hour time limit
- Choice of code cycle and exam format at purchase
- Remote testing available through ICC's PRONTO platform
- Exam purchases are valid for 365 days
- Six exam attempts allowed within six months for national certifications
Pros
- Nationally recognized code credential
- Useful path into building department jobs
- Can be taken remotely
Cons
- Tests code compliance, not home inspection practice
- Exam purchases are final
- You pay the fee again for every attempt
Rank 8
NRPP Radon Measurement Certification
The National Radon Proficiency Program's EPA-recognized certifications for radon measurement and mitigation professionals.
nrpp.info7.6
out of 10
Best for: Home inspectors who want to offer radon testing in states or deals that require recognized certification.
Radon testing is one of the most common add-on services for home inspectors, and NRPP is the credential that agencies most often ask for. The National Radon Proficiency Program is recognized by the EPA and accredited by the ANSI National Accreditation Board under ISO/IEC 17024, and it notes that private certification is required by multiple federal and state agencies. To get certified you take an NRPP-approved initial training course, pass the exam, then apply with your course certificate and register every measurement device you plan to use. Exams cost $125 for Radon Measurement Field Technician and $175 for Radon Measurement Professional, and certification costs $250 for a field technician, $275 for a standard measurement professional and $325 for analytical services, renewed every two years. Field technicians must work under a certified supervisor. The total cost is higher than IAC2, but NRPP carries more weight where radon work is regulated.
Standout feature
An EPA-recognized radon credential accredited under ISO/IEC 17024.
Use cases
Inspectors in radon-prone regions
Earn Radon Measurement Professional certification
Outcome: Radon tests offered with every home inspection
Inspectors joining a multi-inspector firm
Certify as a Field Technician under the firm's professional
Outcome: Able to place and retrieve radon devices on jobs
Key features
- Recognized by the EPA and accredited by ANAB under ISO/IEC 17024
- Measurement Professional, Field Technician, Mitigation and Compliance Inspector credentials
- Requires an NRPP-approved initial training course and a passed exam
- Measurement devices must be on the NRPP-approved device list
- Biennial documentation of competence to stay certified
Pros
- Private certification required by multiple federal and state agencies
- Clear published fees for exams and certification
- Field Technician option for inspectors working under a supervisor
Cons
- Separate costs for training, exam and certification
- Device registration and documentation add paperwork
- Some states run their own radon licensing on top
Rank 9
Certified Master Inspector (CMI)
An experience-based professional designation from the Master Inspector Certification Board for established inspectors.
certifiedmasterinspector.org7.3
out of 10
Best for: Inspectors with at least three years in business who want a senior designation with no annual dues.
Certified Master Inspector is on this list as a goal rather than a starting point. The Master Inspector Certification Board awards the designation to inspectors who have completed at least 1,000 fee-paid inspections and/or hours of training combined and have been in the inspection business for at least three years. Applicants also agree to a code of ethics and periodic criminal background checks, and you do not need to belong to any particular association. The fee is a one-time application charge with no annual dues, applications are processed within 48 hours, and the board returns your money with an explanation if you are not accepted. The board also says it may reject applications that rely almost entirely on education hours. For someone entering the field, CMI is useful mainly as a target: log your inspections and continuing education from day one, and you can apply once you reach three years.
Standout feature
A one-time fee with no annual dues, ever.
Use cases
Inspectors three years into their business
Apply with documented inspections and education hours
Outcome: A senior designation to use in marketing with no yearly dues
New inspectors planning ahead
Log every paid inspection and CE course
Outcome: Records ready for a future CMI application
Key features
- Requires 1,000 fee-paid inspections and/or hours of education combined
- At least three years in the inspection business
- Periodic criminal background checks
- One-time fee with no annual dues
- Open to inspectors from any association
Pros
- No annual dues once approved
- Applications processed within 48 hours
- Fee refunded if you are not accepted
Cons
- Not available to new inspectors
- Experience-based, with no exam of its own
- Fee not shown on the public application page
Frequently asked questions
+What is the best certification for home inspectors?
InterNACHI's Certified Professional Inspector (CPI) is the best first certification for most new inspectors, because the $49 monthly membership includes free online courses, the Online Inspector Exam and the credential. Once you have 250 paid inspections, ASHI Certified Inspector is the stronger credential, since its program is accredited by the NCCA.
+What is the best home inspection certification for beginners?
For beginners, InterNACHI CPI plus the National Home Inspector Examination covers most needs. The NHIE costs $225 per test in most states and is used for regulation in 35 states, while CPI gives you a credential to market from your first inspection.
+Which home inspection certification is best, InterNACHI or ASHI?
InterNACHI is easier to start with: membership is $49 a month and the CPI credential needs online courses and an online exam. ASHI's ACI credential requires passing the NHIE, 250 fee-paid inspections and five reviewed reports, so it suits inspectors with experience, and both groups charge $499 a year for annual membership.
+What is the best home inspector certification in 2026?
In 2026 our ranking puts InterNACHI CPI first, the National Home Inspector Examination second and AHIT's pre-licensing course third. Add IAC2 at $99 a year or NRPP from a $125 exam if you want to offer mold or radon testing.
+Do I need a certification or a license to be a home inspector?
It depends on your state. Many states license home inspectors and set their own education hours and exam, often the NHIE, while private certifications such as InterNACHI CPI or ASHI ACI are optional credentials on top. Check your state board before choosing a course.
+How much does it cost to get certified as a home inspector?
A basic route costs a few hundred dollars: InterNACHI membership is $49 a month and the NHIE is $225 per test in most states. Pre-licensing schools add more, with AHIT's online course from $699 and ICA School packages from $795.
About this list
Updated November 10, 2026 by the Mojolin research desk. Mojolin is self-funded
Questions or corrections: editorial@mojolin.com
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