Direct Answer
A design freeze is a contractual or agreed milestone after which the structural design is locked — no further changes without a formal Change Order. Design freezes matter to fabricators because they provide a reliable baseline for ordering material, scheduling production, and committing to a delivery date. Without a design freeze, the project is always in motion and your material orders and production schedule are at constant risk.
Full Explanation
On design-build and fast-track projects, designers often continue refining the structure while fabrication is in progress. Without a design freeze, every week can bring revised drawings, creating a cascading impact on your production schedule, CNC programs, and material orders. A contractual design freeze (typically at 90% CD or at IFC issue) obligates the design team to process all subsequent changes as formal change orders, compensating the fabricator for the disruption.
What This Means for Your Shop
Push for a design freeze milestone in your subcontract. If the owner or GC won't commit to a hard freeze, negotiate a 'design development fee' — a flat fee for managing revisions during a defined window — to cover the overhead of managing continuous design changes.
Common Mistakes
Agreeing to a fixed-price subcontract on a project where design is still evolving, without a design freeze provision. This is how fabricators absorb design risk that should belong to the owner.
Recommended Process
In contract negotiations, propose a design freeze clause: after a specific date or milestone, any design change that affects fabricated steel quantities or connections is a change order. Quantify what constitutes a 'change' to avoid later disputes.