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100+ Free OBC Complex Buildings Practice Questions

Pass your Ontario Building Code Exam: Complex Buildings (OBC Part 3) exam on the first try — instant access, no signup required.

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2026 Statistics

Key Facts: OBC Complex Buildings Exam

70

Exam Questions

Humber OBC Examinations

3

Hours Allowed

Humber OBC Examinations

70%

Passing Score

MMAH Ontario

$150

Registration Fee (CAD)

Humber Polytechnic

2024

OBC Edition

OBOA / MMAH

BCIN

Prerequisite ID

MMAH Ontario

The OBC Complex Buildings exam is a 3-hour, open-book examination consisting of 70 multiple-choice questions. Administered by Humber Polytechnic for CAD $150.00, it requires a minimum score of 70% to pass. The exam is fully grounded in Part 3 of the 2024 Ontario Building Code and is required for municipal building inspectors and plan examiners in Ontario.

Sample OBC Complex Buildings Practice Questions

Try these sample questions to test your OBC Complex Buildings exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under the 2024 Ontario Building Code, which major occupancy classification applies to an elementary school?
A.Group A, Division 2
B.Group A, Division 1
C.Group A, Division 3
D.Group D
Explanation: Elementary schools are classified as Group A, Division 2 assembly occupancies under the Ontario Building Code. This division covers assembly occupancies not classified under Division 1, 3, or 4. Division 1 covers theatres, Division 3 covers arenas, and Group D covers business office spaces.
2A hospital or nursing home where medical treatment is provided is classified under which occupancy group and division?
A.Group B, Division 2
B.Group B, Division 1
C.Group B, Division 3
D.Group C
Explanation: Hospitals and nursing homes with treatment facilities are classified as Group B, Division 2 (care and treatment) occupancies. Division 1 is for detention occupancies, while Division 3 is for care occupancies without treatment. Group C covers standard residential occupancies.
3What is the occupancy classification of a medium-hazard industrial warehouse?
A.Group F, Division 2
B.Group F, Division 1
C.Group F, Division 3
D.Group E
Explanation: Medium-hazard industrial occupancies, which include general factories and warehouses, are classified as Group F, Division 2. Division 1 is for high-hazard industrial, while Division 3 is for low-hazard. Group E is reserved for mercantile (retail) uses.
4Under the OBC, an office building that does not contain medical clinics or retail spaces is classified as which of the following?
A.Group D
B.Group C
C.Group E
D.Group A, Division 2
Explanation: Office buildings are classified as Group D, business and personal services occupancies. Group C is residential, Group E is mercantile (retail), and Group A is assembly. Standard offices fit the business services definition under Part 3.
5According to Table 3.1.17.1. of the 2024 OBC, what is the occupant load factor used to calculate the occupant load for a dining room (restaurant)?
A.1.20 m² per person
B.0.75 m² per person
C.0.40 m² per person
D.1.85 m² per person
Explanation: Table 3.1.17.1. specifies an occupant load factor of 1.20 m² per person for dining, beverage and cafeteria space. A factor of 0.75 m² applies to assembly spaces without fixed seats, 0.40 m² applies to standing spaces, and 1.85 m² applies to classrooms.
6Calculate the occupant load of a multi-storey office building's floor area that has a net office space of 1,395 m².
A.150 persons
B.100 persons
C.75 persons
D.125 persons
Explanation: Under Table 3.1.17.1., the occupant load factor for offices (Group D) is 9.3 m² per person. Dividing the net floor area by the factor (1,395 / 9.3) yields exactly 150 persons.
7A school laboratory has a floor area of 368 m². What is the calculated occupant load for this laboratory space?
A.80 persons
B.200 persons
C.50 persons
D.100 persons
Explanation: Table 3.1.17.1. specifies an occupant load factor of 4.6 m² per person for laboratories in schools. Dividing the area by the factor (368 / 4.6) gives exactly 80 persons.
8Under Table 3.1.17.1., what is the occupant load factor used to calculate the occupant load for retail space on the first storey of a department store?
A.3.70 m² per person
B.5.60 m² per person
C.9.30 m² per person
D.1.85 m² per person
Explanation: Table 3.1.17.1. specifies an occupant load factor of 3.70 m² per person for mercantile occupancies on the basement and first storeys. A factor of 5.60 m² applies to storeys other than the basement and first storey. 9.30 m² applies to offices, and 1.85 m² is for classrooms.
9A library reading room has a floor area of 185 m². What is the calculated occupant load for this room?
A.40 persons
B.100 persons
C.50 persons
D.20 persons
Explanation: Table 3.1.17.1. specifies an occupant load factor of 1.85 m² per person for reading or writing rooms or lounges, which includes library reading rooms. Dividing the floor area by this factor (185 / 1.85) yields exactly 100 persons.
10How does the OBC define 'building height' for the purpose of classifying a building under Part 3?
A.The number of storeys contained between the roof and the floor of the first storey, or the height in metres from grade to the topmost ceiling
B.The maximum height of the building measured from the lowest foundation footings to the highest point of the roof
C.The height measured in storeys above the basement floor level to the roof rafters
D.The height in metres measured from the lowest level of fire department access to the roof deck
Explanation: Building height is defined in Division A as the number of storeys contained between the roof and the floor of the first storey, or the height in metres from grade to the topmost ceiling. This determines which classifications apply under Part 3.

About the OBC Complex Buildings Exam

The Ontario Building Code (OBC) Complex Buildings exam qualifies building officials, designers, and consultants to design and inspect buildings regulated under Division B, Part 3 of the OBC. These are typically buildings exceeding 600 square metres in area or three storeys in height, representing complex structures such as assemblies, care facilities, residential apartments, offices, mercantile stores, and industrial plants. The exam focuses on occupancy classifications, fire separations, fire protection systems, egress design, accessibility, and high-rise special measures.

Questions

70 scored questions

Time Limit

3 hours

Passing Score

70%

Exam Fee

CAD $150.00 (Humber Polytechnic (on behalf of MMAH))

OBC Complex Buildings Exam Content Outline

15%

Complex Building Classifications

Identify and classify major occupancies (Groups A to F), compute occupant loads, and apply provisions for multiple major occupancies within a single structure.

25%

Fire Safety and Spatial Separation

Determine fire-resistance ratings, calculate limiting distances, define exposing building faces, establish permissible unprotected openings, and specify firewall details.

25%

Egress and Occupant Safety

Analyze exits, design fire-rated corridors, determine travel distances, specify exit capacities and width dimensions, and regulate interior flame spread ratings.

15%

Fire Protection Systems

Apply regulations for automatic sprinkler systems, fire alarms, portable extinguishers, standpipe networks, and water supplies.

10%

High-Rise Requirements

Determine the application of Subsection 3.2.6 for high buildings, including venting, smoke control, elevator controls, emergency electrical power, and alarm voice communication.

10%

Structural & Environmental Safety (Part 3)

Analyze requirements for glass in guards, loads on guards, structural fire protections, and safety provisions related to building envelopes.

How to Pass the OBC Complex Buildings Exam

What You Need to Know

  • Passing score: 70%
  • Exam length: 70 questions
  • Time limit: 3 hours
  • Exam fee: CAD $150.00

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

OBC Complex Buildings Study Tips from Top Performers

1Master the index and structural layout of Division B, Part 3. Quickly finding subsections (e.g. 3.2.3 for spatial separations, 3.4 for egress) is critical to finishing in 3 hours.
2Bring the index tabs for your Building Code Compendium. Tabbing key tables (such as Table 3.1.2.1. for occupant load, Table 3.1.3.1. for occupancy separations, and Table 3.4.3.2. for egress exit widths) saves precious minutes.
3Pay attention to the definition of 'grade' and how 'building height' (in storeys and metres) determines which structural and fire protection rules apply.
4Understand the difference between sprinklered and non-sprinklered allowances, particularly how they double or reduce travel distances, fire-resistance ratings, and spatial separation calculations.
5Review the special high-building requirements in Subsection 3.2.6 and Supplementary Standard SB-4, as high-rise rules have their own specific triggers and containment measures.

Frequently Asked Questions

Is the OBC Complex Buildings exam open book?

Yes. The exam is open book. You are permitted and expected to bring your own paper copy of the 2024 Ontario Building Code Compendium. No electronic devices, loose notes, or photocopies are allowed.

What is the fee for the OBC Complex Buildings exam?

The exam registration fee is CAD $150.00 per attempt. Humber Polytechnic also charges a CAD $50.00 administrative fee for cancellations or rescheduling requested less than 7 calendar days before the exam.

What is a passing score on the exam?

The passing score is 70%. Out of the 70 multiple-choice questions, you must answer at least 49 questions correctly to pass.

Do I need a BCIN to register for the exam?

Yes. Every candidate must obtain a Building Code Identification Number (BCIN) from the Ministry of Municipal Affairs and Housing (MMAH) website before booking an exam through Humber.

Are the exam questions based on the 2024 Building Code?

Yes. As of March 30, 2026, all Ontario Building Code exams have transitioned to the 2024 Building Code, which harmonizes many Ontario provisions with the National Building Code of Canada.

Can I take the exam online?

Yes. Humber Polytechnic offers online exams via virtual proctoring from your home or office, in addition to in-person test sittings at designated Ontario college test centres.