A fixed-price, closed-book contractor quotes a lump sum and assumes cost risk on paper. What this means in practice is that the contingency built into that lump sum belongs to the contractor, not the developer. Change orders are the mechanism through which the contractor recovers when costs move and they are priced at a premium because the production sequence is already underway. For a developer whose lender requires auditable cost documentation, a closed-book contract creates a structural incompatibility that does not resolve itself.
What Open-Book Actually Means
In an open-book construction for developers model, every cost in the project is visible subcontractor invoices, material receipts, GC fee, and field costs. Nothing is buried in a lump sum. The developer sees what things cost when they cost it. The lender receives draw packages built from actual cost documentation rather than a summary of how the project is tracking against a contracted total.
This transparency does three things simultaneously. It aligns the contractor’s incentives with the developers; there is no margin to protect inside a hidden price. It satisfies lender documentation requirements without the GC needing to reconstruct a cost package at draw time. And it removes the conditions that generate disputes, because cost information is shared rather than disclosed selectively.
Why a Developer-Focused Construction Model Requires It
A developer-focused construction model is built around the financial requirements of capital-backed projects, not the operational preferences of a production builder. For developers running SFR programs, BTR pipelines, or infill builds with institutional financing, open-book GC model reporting is not a preference. It is what the lender relationship requires and what the deal structure depends on.
Factum Construction Georgia operates on a cost-plus open-book model on every residential project. The fee is transparent, the costs are documented, and every draw package is formatted for lender review from the first submission.
See what open-book construction looks like in practice. Book a call with us
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