Your school needs an understandable building decision, not a pile of prices based on different assumptions. With Illinois modular classroom prices organized around a common brief, you can show what each option provides and why it belongs in the discussion. That makes the commercial comparison useful to the people authorizing expenditure as well as the people planning the classrooms.
For the wider project picture, explore Illinois modular buildings alongside your classroom space plans.
Explain the problem the building is supposed to solve
Describe the teaching constraint in plain language before presenting a preferred design. How many groups lack suitable space, which activities are displaced and how long is the need expected to last? Keep the evidence separate from the proposed answer. A decision maker should be able to understand why an addition is under consideration without having to interpret a floor plan first.
Then show how the proposed rooms address that constraint. If some capacity remains shared with the existing school, say so. If a future phase is only a possibility, do not present it as part of today's funded result. This keeps the case proportionate and makes it easier to compare an alternative that meets the same need differently.
Make exclusions readable
An attractive supplier total can be difficult to evaluate if the remaining owner costs sit in several footnotes. Use the installed building budget guidance to bring those items into view. Distinguish priced work from allowances and matters still awaiting confirmation. Do not replace an unknown with a reassuring zero. A preliminary comparison is more credible when its unresolved parts are clearly labeled.
Show what changes between the alternatives
For an Illinois education project, a useful decision paper need not repeat every technical detail. Identify the differences that affect instruction, site work, responsibility and cost. One modular school option might include a different room mix; another might leave more work with the owner. Explain the operational consequence of each difference instead of allowing a lower headline figure to stand in for the whole comparison.
Keep supporting drawings and provider clarifications available to whoever needs them. When a response changes, update the comparison rather than asking reviewers to reconcile several emails. Confirm the validity period and assumptions of the prices you are presenting so the school knows when another check will be required.
Leave the meeting with a clear next decision
Approval to investigate is not the same as authority to commit to a building. State what you are asking the school to decide and what information remains necessary before the next step. This protects the project from an ambiguous agreement that different people interpret differently. The objective is a defensible route to useful teaching space: a clear need, comparable prices and a decision everyone can accurately describe afterward.