1.1 Occupancy Group Accessibility and IBC Chapter 11 Scoping
Key Takeaways
IBC 1103.1 makes sites, buildings, structures, facilities, elements and spaces, temporary or permanent, accessible unless a specific exception applies.
IBC Chapter 11 answers what, where and how many; ICC A117.1 answers how each required element is built.
Equipment spaces are exempt under 1103.2.9, raised security areas under 1103.2.6, and limited access spaces under 1103.2.7; 1103.2.4 covers Group U utility buildings.
Employee work areas need only approach, enter and exit, plus 907.5.2.3.1, 1009 and common use circulation paths under 1104.3.1.
Occupancy changes the numbers: A, B, M and R-1 entrances, R and I unit counts, hospital and rehabilitation parking, and A/M family toilet rooms all scope differently.
1.1 Occupancy Group Accessibility and IBC Chapter 11 Scoping
The ICC 21 outline gives 2% of the exam to Occupancy Group Accessibility: deciding which accessibility provisions apply based on the occupancy classification and use of a building. This is a scoping skill. You use the International Building Code (IBC) to decide whether an element is required, where it goes and how many are needed, and then you use ICC A117.1 to verify how it is built.
The Two-Document System
| Question | Document | Typical exam wording |
|---|---|---|
| Is accessibility required here at all? | IBC Section 1103 | "Which space is not required to be accessible?" |
| How many accessible spaces, units or seats? | IBC Sections 1106, 1108, 1109, Tables 1106.2 and 1109.2.2.1 | "What is the minimum number of..." |
| What are the dimensions, heights and forces? | ICC A117.1 Chapters 3 to 11 | "What is the maximum height of..." |
| How do existing buildings differ? | IEBC Section 306 plus A117.1 "existing buildings" provisions | "In an alteration..." |
IBC Section 1101.1 says Chapter 11 controls the design and construction of facilities for accessibility. Section 1102.1 then requires buildings and facilities to be designed and constructed to be accessible "in accordance with this code and ICC A117.1." The IBC user note states the philosophy directly: everything is required to be accessible, and the code then lists the conditions under which it is not.
The Baseline: IBC 1103.1
Sites, buildings, structures, facilities, elements and spaces, temporary or permanent, shall be accessible to individuals with disabilities.
The words temporary or permanent matter. A temporary sales trailer, a seasonal pavilion or a temporary classroom building is covered unless an exception applies. On a plan review question, assume coverage first and then look for the specific exception that removes it.
The General Exceptions in IBC 1103.2
The 2021 and 2024 IBC use the same subsection numbers for these exceptions. Tab this list; it is a reliable source of scoping questions.
| Section | Exception | What stays required |
|---|---|---|
| 1103.2.1 | Specific requirements in Sections 1104 to 1112 limit accessibility | Only what those sections still require |
| 1103.2.2 | Employee work areas | Approach, enter and exit; 907.5.2.3.1 alarms; 1009 egress; 1104.3.1 circulation |
| 1103.2.3 | Detached one- and two-family dwellings and their accessory structures | Nothing under Chapter 11 |
| 1103.2.4 | Group U utility buildings | Paved work areas and public areas in agricultural buildings; private garages or carports that contain required accessible parking |
| 1103.2.5 | Construction sites (scaffolding, bridging, hoists, material storage, construction trailers) | Nothing |
| 1103.2.6 | Raised areas used primarily for security, life safety or fire safety (observation galleries, guard towers, fire towers, lifeguard stands) | Nothing |
| 1103.2.7 | Limited access spaces reached only by ladders, catwalks, crawl spaces, freight elevators or very narrow passageways | Nothing |
| 1103.2.8 | Raised or lowered areas in places of religious worship that are less than 300 sq ft, 7 in. or more above or below the floor, and used primarily for religious ceremonies | The rest of the worship building |
| 1103.2.9 | Equipment spaces used only by service personnel for maintenance, repair or occasional monitoring | Nothing |
| 1103.2.10 | Highway tollbooths reached only by bridges or tunnels | Nothing |
| 1103.2.11 | Group R-1 with not more than five units for rent that is also the proprietor's residence (2024 adds small transient R-3 congregate living facilities and boarding houses) | Nothing |
| 1103.2.12 | Day care inside a dwelling unit | Only the day care portion is covered |
| 1103.2.13 | Detention common use areas used only by inmates and security staff that do not serve Accessible cells | Areas serving Accessible cells |
| 1103.2.14 | Walk-in coolers and freezers reached only from employee work areas | Nothing |
Warning
Religious buildings are not exempt from the IBC the way they are from ADA Title III. The only religious-worship relief in the IBC is the narrow 1103.2.8 exception for small raised or lowered ceremonial areas. The sanctuary seating, fellowship hall, classrooms, toilet rooms and parking remain fully scoped.
Employee Work Areas: The Most-Tested Exception
Section 1103.2.2 limits spaces and elements within employee work areas to three things: visible alarm wiring under 907.5.2.3.1, accessible means of egress under Section 1009, and common use circulation paths under 1104.3.1. The work area must be designed so a person with a disability can approach, enter and exit it. Work areas, or portions of them, that are less than 300 sq ft and located 7 in. or more above or below the floor, where the elevation change is essential to the function of the space, are exempt from all requirements (raised courtroom stations are handled separately in 1109.4.1.4).
Section 1104.3.1 makes common use circulation paths within employee work areas accessible routes, with three exceptions:
- Work areas less than 1,000 sq ft that are defined by permanently installed partitions, counters, casework or furnishings.
- Circulation paths that are an integral component of equipment.
- Circulation paths in exterior work areas fully exposed to the weather.
A117.1 Section 107.5 defines an employee work area as space used only by employees and only for work, and it states that corridors, toilet rooms, kitchenettes and break rooms are not employee work areas. A staff break room behind an "employees only" door is therefore a common use space that must be fully accessible.
Occupancy-Specific Scoping Triggers
Occupancy classification changes the required quantity of accessible elements. These are the triggers most often tested:
| Occupancy or use | Scoping rule (2021/2024 IBC) |
|---|---|
| A-1 to A-4 with building occupant load over 300; B, M or R-1 over 500 | Each accessible public entrance needs a power-operated or low-energy power-operated door (1105.1.1, Table 1105.1.1) |
| Group M with five or more tenant spaces, health care offices (B or I), transportation facilities, government buildings, structures with four or more dwelling units | Cannot use the 3,000 sq ft multistory exception (1104.4) |
| Hospital outpatient facilities | 10% of patient and visitor parking accessible (1106.4) |
| Rehabilitation and outpatient physical therapy | 20% of patient and visitor parking accessible (1106.5) |
| Assembly and mercantile with an aggregate of six or more required water closets | Family or assisted-use toilet room (1110.2.1) |
| I-1, I-2, I-3, R-1, R-2, R-3, R-4 | Accessible, Type A and Type B unit counts in 1108.5 and 1108.6 |
| Assembly seating | Wheelchair spaces from Table 1109.2.2.1; assistive listening from Table 1109.2.7.1 |
Plan Review Method
- Classify every occupancy and calculate occupant loads; several triggers depend on them.
- Assume full coverage under 1103.1.
- Test each space against 1103.2.1 to 1103.2.14 and record the exception number on the review comments.
- Apply the occupancy-specific counts from 1104 to 1112.
- Only then move to A117.1 for dimensions.
A new church includes a 260 sq ft chancel platform raised 18 inches above the sanctuary floor and used primarily for religious ceremonies. Which statement is correct under the 2021 IBC?
The whole church is exempt because religious entities are exempt from IBC Chapter 11 accessibility
Only the chancel platform is exempt; the rest of the church is scoped normally
The chancel platform must be served by a ramp because it exceeds 7 inches in height
Only the parking and the main entrance must be accessible
An open office work area of 850 sq ft is defined by permanently installed casework. Under IBC 1104.3.1, are the common use circulation paths inside this work area required to be accessible routes?
Yes, all common use circulation paths in employee work areas must be accessible routes
Yes, but only where the work area serves the public
No, because it is under 1,000 square feet and defined by permanently installed casework
No, because employee work areas are exempt from all of Chapter 11
Which space is exempt from IBC Chapter 11 under the equipment spaces exception?
An elevator machine room visited only by service personnel for maintenance
An employee break room located inside a warehouse
A Group U private garage that contains required accessible parking
A fellowship hall attached to a place of worship
Sections you finish are checked off in the contents.