Most Long Island elementary class size caps cluster between 24 and 30 students. The districts at the extremes — those capping at 15 and those at 35 — are doing something specific. Knowing which extremes exist and what they cost is the real preparation for a class size negotiation.
CompBase covers 124 of Long Island's 125 public school districts (all 56 in Nassau, 68 of 69 in Suffolk). The elementary class size maximum is one of the most operationally consequential numbers in any teacher CBA — it dictates how many teachers the district hires, how rooms are configured, and how the school day flows.
Across districts where the cap is specified in the contract:
| Cap | Contracts | Pattern |
|---|---|---|
| 15 | 2 | Small districts, often with special program structures |
| 18–22 | 8 | Small-to-medium districts with deliberate small-class policies |
| 23–27 | 46 | The "comfortable middle" — typical suburban Long Island |
| 28 | 20 | Modal cap |
| 29–32 | 25 | Larger districts or those balancing budget against class size |
| 33+ | 6 | Outlier districts with the highest caps |
The modal cap is 28 students. The "comfortable middle" of 23-27 students together accounts for 46 districts. The full normal range of 23-32 covers about 80% of the corpus.
The interesting cases are at the extremes — both the low end (caps of 15-22) and the high end (caps of 33+).
What 15-Student Caps Signal
The 2 districts capping elementary classes at 15 students aren't doing this by accident. Three patterns explain very low caps:
Special program structures
Some Long Island districts have programs (deliberate lower student-teacher ratio for early grades, intensive intervention programs, or special education-influenced classroom organization) that create unusually low caps for specific situations.
If the contract specifies a 15-student cap for "elementary class," and the district has 1,200 elementary students, the implication is that the district needs 80 teachers just to staff classrooms — a substantial cost commitment that's usually paired with other compensation moderation.
Small district structure
Small Long Island districts (under 1,000 students) sometimes don't have a "class size cap" in the traditional sense — instead they have natural class sizes determined by enrollment. The contract may reflect actual practice rather than a regulatory floor.
A district with 30 first-graders runs two sections of 15 students each. The contract codifies what was going to happen anyway.
Historical deliberate small-class policies
A few Long Island districts have made small class size a defining feature of their educational identity, and the contract reflects that. These are often higher-cost districts with a community willing to fund the staffing implications.
What 33+ Caps Signal
The 6 districts with caps of 33 or higher aren't all doing the same thing either:
Caps that are effectively unenforceable
A cap of 35 students in elementary is so high that it rarely triggers in practice — actual class size is dictated by physical room capacity (typically 28-30 students in a standard classroom) and grade enrollment.
The cap exists in the contract but doesn't constrain district operations. This is common in older contracts where caps were set decades ago at levels that don't reflect current educational practice.
Caps with carve-outs that change effective enforcement
Some contracts have caps with significant exceptions: "30 students except for combination grades, where the cap is 35" or "28 students except where building capacity requires temporary increases."
The headline cap can look low but the carve-outs reduce its operational impact.
Deliberate "trust the administrators" structures
A handful of contracts have very high caps with explicit language giving the district administrative discretion to manage class sizes operationally rather than via contract. The cap is a hard ceiling, not a target.
The Modal 28-Student Position
Most Long Island districts cap elementary classes at 28. This number sits at a specific tradeoff point:
- 24 students per class is what most educators consider optimal for instruction quality
- 30 students per class is what most administrators consider operationally efficient
- 28 is the negotiated middle that satisfies neither side completely but is sustainable for both
A typical 28-cap structure: the contract says elementary classes shall not exceed 28 students. In practice, the district aims for 24-26 per class and uses the 28 cap as a hard ceiling for budgetary emergencies. The union accepts this because the cap rarely fires.
This is one of those negotiation positions where the contract language and the operational reality have diverged — both sides have learned to live with a 28-cap that means "we aim for 25, but 28 is the absolute ceiling."
The Grade-Specific Question
A subtle issue across many Long Island contracts: do they have a single elementary cap, or grade-specific caps?
Three common structures:
Single elementary cap (e.g., 28 students K-5)
The simplest structure. Same cap applies whether the class is kindergarten, fifth grade, or anywhere in between.
K-2 cap and 3-5 cap (e.g., 24 K-2, 28 grades 3-5)
The educational logic: younger children benefit more from smaller classes. The negotiation logic: this costs more in early elementary but is offset by larger classes in upper elementary.
Grade-by-grade caps (e.g., 22 K, 24 grade 1-2, 26 grade 3-5)
A graduated structure that maximizes early-grade attention while accepting larger classes for older students.
Each structure has different cost implications and reflects different educational philosophies. The negotiation question is whether the structure matches what the district actually wants to deliver.
The Combination Class Carve-Out
A common contract feature: special rules for combination classes (e.g., a 2nd-3rd grade combination class in a small school).
The standard carve-out: combination classes have a higher cap than single-grade classes, typically by 2-4 students. The educational logic is that combination classes require fewer total students because the teacher is splitting attention across two grade levels.
Some Long Island districts have:
- No combination carve-out — the regular cap applies regardless
- Standard combination carve-out (cap +3)
- Generous combination carve-out (cap +5 or higher)
- Combination class restrictions (limits on how often, when, and under what conditions combination classes can be created)
The carve-out language is often inherited from earlier contracts and not updated. Districts that have stopped running combination classes still carry the carve-out language; districts that increasingly use combination classes may have outdated restrictions.
The Special Education Overlap
Class size caps in elementary often have special education implications. A teacher with 28 students total might be teaching 22 general education students plus 6 students with IEPs requiring inclusion supports.
Most Long Island contracts handle this with:
- Special education students counted as 1 each (most common — no adjustment)
- Special education students counted at higher weight (less common — typically 1.5x or 2x in the count)
- Hard cap on special education students per class (rare but exists — typically 4-6 max)
The structure here directly affects the practical workload of general education teachers. A teacher capped at 28 students who has 8 students with IEPs has a substantially different workload than one capped at 28 with 1 IEP student.
This is an area where the contract language often hasn't kept up with the increasing diversity of student needs in mainstream classrooms.
For every Long Island teacher CBA in the corpus, CompBase tracks:
- The elementary class size cap (single cap or grade-specific)
- Secondary class size caps (middle school, high school, specialized)
- Combination class carve-outs
- Special education weighting in class size calculations
- The historical change pattern — has the cap moved across successor cycles?
You can compare your district's caps to peer districts and see which districts have tightened or loosened their caps in recent cycles.
When the question at the table is "should we adjust class size caps?", the right comparison isn't "is 28 the right number?" — it's "what's the operational reality in our district, what does our enrollment trajectory look like, and what cap structure matches both?"
Class size caps are one of the highest-leverage negotiations in any teacher contract because they directly drive district staffing costs. See your district's caps against the Long Island distribution.