The estimate that won the bid is built on assumed sub pricing. Buyout is where that assumption gets tested — negotiating with the actual subs who'll do the work, locking their scope and price into a signed subcontract, and finding out whether the job's real cost basis matches what was bid.
The gap between estimated and bought-out cost is where a lot of margin either gets protected or quietly disappears, depending on how tightly the scope in each subcontract matches what was assumed in the estimate.
Example
A GC's estimate assumed $85,000 for drywall based on a rough unit price. During buyout, the awarded drywall sub's contract locks in at $91,000 once their exclusions are reconciled against the original scope — a $6,000 gap the GC needs to absorb or recover elsewhere.
Related terms
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Where this shows up in Datumel:
Sub Scope LetterFree
Describe the project and what the sub owns. Get a formal pre-mobilization scope letter with a sign-off line.
Estimating & Scope-Gap SystemFrom $8,000 one-time
An estimating and buyout system in your own tools: a scope-gap check, a bid-leveling workbook, and tuned assistants that catch missed scope before it costs you.