Construction Bid Package: What GCs Include When Soliciting Sub Bids
A GC's bid package sets the information floor for every subcontractor estimate. When the package is incomplete, subs build in contingency to cover unknowns — or miss scope entirely, creating gaps that surface as change orders after award. Getting the bid package right is one of the highest-leverage activities in preconstruction.
What Is a Bid Package?
A bid package is the set of documents a GC distributes to subcontractors and suppliers to solicit competitive pricing for a defined scope of work. Each trade receives a package tailored to their work, though all packages share a common core. The quality of the bid package directly determines the quality of the bids received — and ultimately the accuracy of the GC's estimate and final contract.
On design-bid-build public projects, the bid package is largely dictated by the owner's contract documents. On negotiated or design-build work, the GC has more control over structure, which is both an opportunity and a responsibility.
Core Components of a GC Bid Package
The cover document that establishes the formal solicitation. A well-written ITB includes:
- •Project name, location, and owner
- •Bid due date, time, and submission format (email, portal, or sealed envelope)
- •Scope of work being solicited (trade-specific, not generic)
- •Anticipated start date and project duration
- •Prequalification requirements (bonding, licensing, insurance minimums)
- •Point of contact for RFIs and clarifications
- •List of documents included and where to access them
The single most important document in the package. The scope narrative defines exactly what work is included and — critically — what is excluded. Ambiguity here is where subcontract disputes originate.
- •Inclusions: Everything the sub must price, install, and warrant
- •Exclusions: Items explicitly not in scope (e.g., "excludes domestic water connections by plumber")
- •Interface points: Where this sub's scope ends and another's begins (critical for MEP coordination)
- •Specification sections: List CSI division sections applicable to this trade
- •Alternates required: Any add/deduct alternates the sub must price
Include only the sheets relevant to the sub's scope — not the full set, unless necessary for coordination. Over-distributing creates confusion about what applies.
- •Architectural sheets relevant to work (dimensions, finishes, details)
- •Structural sheets if the sub needs them for embedments or penetrations
- •MEP sheets — full set for each respective trade
- •Civil / site drawings for earthwork and utilities trades
- •Applicable specification divisions (CSI formatted)
- •Geotechnical report for earthwork, foundations, and utilities if available
Require subs to submit pricing on a standardized form. This is what makes bid leveling possible. A good bid form includes:
- •Base bid total
- •Unit prices for likely changes (linear foot of pipe, square foot of drywall, etc.)
- •Alternates (separately priced add/deducts)
- •Allowances if any are required
- •Cost breakdown by CSI division or phase if needed for payment apps
- •Labor rate schedule for time-and-material work
- •Acknowledgment of addenda received
The project-specific terms subs must acknowledge before bidding. Typically covers:
- •Insurance requirements (type, limits, additional insured language)
- •Bonding requirements (performance and payment bond thresholds)
- •Schedule requirements (milestone dates the sub must honor)
- •Prevailing wage / certified payroll requirements (public work)
- •OSHA safety requirements and GC safety program compliance
- •Subcontract terms preview (flow-down clauses, payment terms, retainage)
- •Substitution procedures and product submission requirements
Bid Leveling: Making Bids Comparable
Bid leveling is the process of adjusting sub bids to a common scope baseline so the GC can make a true apples-to-apples comparison. Even with a tight bid package, subs will qualify, exclude, and assume differently. Leveling catches those differences before you use the number in your estimate.
| Item | Sub A (Base) | Sub B (Low Bid) | Sub C |
|---|---|---|---|
| Base bid | $480,000 | $410,000 | $455,000 |
| Excludes testing/commissioning | Included | +$18,000 | Included |
| Excludes temp power hookup | Included | +$6,500 | Included |
| Non-standard material spec | Spec compliant | +$12,000 to upgrade | Spec compliant |
| Leveled total | $480,000 | $446,500 | $455,000 |
In this example, Sub B's apparent low bid of $410K levels to $446,500 — still the low bid, but a $36,500 narrower spread than it appeared. If the leveling had been skipped and the GC used $410K in their estimate, they'd be absorbing those exclusions as change orders or out-of-pocket costs. Always level before you use a number.
Managing Scope Gaps Between Trades
The most dangerous bid packages are those where trade boundaries are assumed rather than stated. Common interface gaps that produce post-award disputes:
- • Mechanical/electrical coordination — who provides disconnect for equipment
- • Plumbing/concrete — who sleeves and cores slabs for penetrations
- • Framing/drywall — who installs blocking for millwork and toilet accessories
- • Electrical/data — who furnishes conduit for low-voltage runs
- • Roofing/HVAC — who provides and installs equipment curbs and flashings
- • Glazing/framing — who caulks and seals perimeter at framing-to-glass interface
- • List each interface point explicitly in both trades' scope documents
- • Use "by GC" placeholder for items not yet assigned
- • Issue a clarification addendum if a question comes in from one sub that reveals a gap affecting others
- • During bid leveling, note any sub that excluded an interface item and add back
- • Lock interface assignments in the subcontract scope exhibit before execution
Addenda Management
Addenda are formal modifications to the bid package issued before bids are due. Every addendum must be tracked, distributed to all bidders simultaneously, and acknowledged on the bid form.
- ▸Issue promptly: Don't hold a clarification until bid day. Subs need time to reprice. A good rule: no addenda within 48–72 hours of bid due date without extending the deadline.
- ▸Number sequentially: Addendum No. 1, No. 2, etc. Include the date and a clear description of what changed. Attach revised sheets or specification pages.
- ▸Distribute to all bidders: Use a documented distribution log. If a sub didn't receive an addendum and submits a non-conforming bid, you either reject it or spend hours reconciling.
- ▸Require acknowledgment: The bid form should include a line for each addendum: "Addendum No. ___ dated ___ received and incorporated: Yes / No." If a sub doesn't acknowledge all addenda, their bid may not be valid.
- ▸Extend if necessary: If an addendum materially changes scope or drawings, extend the bid due date to give subs adequate time to reprice. A rushed bid with a late addendum is an inaccurate bid.
Bid Award and Scope Confirmation
Selecting a sub is not just about price. The award decision should consider:
| Criterion | What to Evaluate |
|---|---|
| Price (leveled) | Base bid + all adjustments from bid leveling |
| Schedule compliance | Can they meet milestone dates? Do they have the crew available? |
| Prequalification | Valid license, bonding capacity, insurance certificates in order |
| Experience / references | Similar project type and scale; verified performance history |
| Scope confirmation | Written scope confirmation meeting before award — no ambiguity in what they're pricing |
| Subcontract terms | Ability to accept flow-down, payment terms, retainage, and GC's subcontract form |
Before issuing a Notice to Proceed, hold a scope confirmation meeting or exchange written confirmation emails locking down exactly what the award covers. This is your last clean opportunity to close scope gaps before the subcontract is executed and mobilization begins.
5 Best Practices for GC Bid Packages
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1.
Write scope documents before pulling drawings. Force yourself to articulate what each sub is responsible for in plain language before you rely on drawings to "show" it. Drawings describe design intent, not contractor responsibility.
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2.
Issue a trade-specific bid package, not a generic dump of all project documents. Tailored packages produce focused bids. Burying a concrete sub in MEP drawings creates confusion, not coverage.
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3.
Require a standardized bid form. Free-form bid letters guarantee you can't level bids efficiently. A bid form is worth the 30 minutes it takes to create.
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4.
Solicit three bids minimum per trade. Two bids give you a price — three give you a market. More than five is usually diminishing returns and hard to manage. Three to four is the sweet spot for competitive pricing without bid management overhead.
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5.
Level every bid before using it in your estimate. The low number on the bid summary sheet is not your number until you've checked what it includes. One missed exclusion on your largest sub can swing your entire estimate past your contingency.
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