Open-book job costing means the client has direct access to the contractor’s cost tracking — actual costs, committed costs, budget by cost code, and the current projection-to-complete. On a standard construction contract, cost data is internal to the contractor; the client sees only invoices. Open-book reporting gives the client direct visibility into the project’s financial position rather than requiring them to infer it from invoices and change orders. For cost-plus contracts, open-book reporting is the client’s primary financial protection — they are paying actual costs, and the monthly job cost report is how they verify what those costs are. RainFire Builders provides open-book reporting on cost-plus contracts as a standard practice and makes it available on fixed-price contracts for clients who prefer maximum transparency.