How Do You Buy Out a Construction Job?

Buyout is the general contractor's work of buying the job it just sold: turning each line of the estimate into a subcontract or purchase order. It starts when the prime contract is awarded and runs through preconstruction, trade by trade, with the long-lead trades (structural steel, elevators, switchgear, mechanical equipment) first.

Two numbers matter for each trade. The budget is what the estimate carried for it. The award is the signed subcontract amount. The difference is buyout savings (award under budget) or a buyout overrun. Whether savings stay with the GC depends on the prime contract: on a lump-sum job they usually do, while a cost-plus or guaranteed-maximum-price contract often returns them to the owner or shares them. Check your contract.

The scope review is where buyout savings are kept or lost. Walk the bidder through the drawings and specification sections, the exclusions on its proposal, the schedule, and who provides what at the trade's edges (temporary power, firestopping, equipment pads, cutting and patching). Every clarification goes into the subcontract's scope exhibit, not just into meeting notes. For the leveling step itself, see how to level subcontractor bids.

On federal construction contracts over $150,000 (the statute's $100,000, adjusted for inflation in FAR 28.102-1), the prime must furnish performance and payment bonds before the contract is awarded (40 U.S.C. § 3131); whether you bond your subs is a business decision and, on some jobs, a contract requirement. And each federal progress-payment request carries the contractor's certification that subcontractors and suppliers have been paid from earlier payments (FAR 52.232-5), which is one reason the subcontract's payment terms must line up with the prime's.

A signed subcontract is not the end of buyout. Before the sub starts work, collect its certificate of insurance, checked against the insurance exhibit, and the additional-insured endorsement, since a certificate alone does not change coverage (ACORD certificates FAQ). Add a Form W-9 (IRS), its contractor license where the state requires one, and any bond. What each document is and why it matters is in what paperwork a GC requires from a sub.

A fictional GC is buying out the fictional "Corbett Street Clinic". Four trades are awarded and three are signed; plumbing's subcontract is issued but not signed, and drywall is still out to bid. Electrical's low base bid was $271,200 but excluded fire alarm, which the GC priced at $8,750 in leveling, so the award is the leveled $279,950.

Check: $13,500 + $6,450 + $7,850 = $27,800, and $1,040,150 − $1,012,350 = $27,800. Plumbing stays out of the reported savings until its subcontract is signed; if it signs at $206,300, its $8,300 overrun brings the total to $19,500 ($27,800 − $8,300, or $1,238,150 − $1,218,650). Drywall stays out of the totals until it is awarded; carrying its budget as if it were bought out would overstate the savings. Had the GC awarded electrical on the $271,200 base bid, its savings would have looked like $15,200 and the $8,750 of fire alarm would have come back later as a change.

• Awarding on the base bid without leveling exclusions.
• Skipping the scope review on a low bid that looks too good.
• Leaving the clarifications out of the subcontract's scope exhibit.
• Letting a sub mobilize before its certificate and endorsement are in.
• Releasing long-lead equipment late because the subcontract was not signed.
• Reporting savings on trades that are awarded but not yet signed.

When a sub declines the subcontract, go back to the leveled bids, not the base bids, and re-check the next bidder's exclusions before you issue again. Later changes to a signed subcontract are priced as in how to price a change order.

Conflo's Buyout lists every trade with its budget from the estimate and the awarded subcontractor and leveled amount from Bid leveling, with the savings or overrun per trade and in total. Estimated divisions with no trade bid yet appear as not started. Each trade moves from To issue to Issued to Signed: the GC issues the subcontract to the awarded bidder, and the sub signs it or declines with a reason in Conflo. If the sub declines, Conflo offers the next-lowest eligible leveled bid. A new subcontract takes the project's retainage terms, or 10% when none are set, and an executed one opens the sub's billing.

Insurance certificates, W-9s and licenses are requested and reviewed in Compliance. Not built today: bond tracking, and a scope-review meeting record tied to the trade.

Buyout is where the estimate meets real contracts. Award on the leveled number, put every clarification in the subcontract, and do not call a trade bought out until it is signed and its paperwork is in.

Keep a buyout log with budget, award and status for every trade, and report savings only on signed trades.

See how buyout works in Conflo

1. 40 U.S.C. § 3131, Bonds of contractors of public buildings or works — U.S. Government Publishing Office (GovInfo). Read October 17, 2026.
2. FAR 28.102-1, General (bonds for construction contracts) — Acquisition.gov, U.S. General Services Administration. Read October 17, 2026.
3. FAR 52.232-5, Payments under Fixed-Price Construction Contracts — Acquisition.gov, U.S. General Services Administration. Read October 16, 2026.
4. Certificates of Insurance: Frequently Asked Questions — ACORD. Read October 16, 2026.
5. About Form W-9, Request for Taxpayer Identification Number and Certification — Internal Revenue Service. Read October 16, 2026.