Bid Shopping and Fair Bidding: The Ethics and Business Case for Doing It Right
Bid shopping — sometimes called bid peddling — is the practice of taking one subcontractor's bid number and using it to pressure another subcontractor to lower their bid. The GC doesn't want to go with the low bidder (maybe they prefer a different sub for quality or relationship reasons), but they want to drive the preferred sub's price down to match the low bid. So they tell the preferred sub the low number, ask them to match or beat it, and award at the lower price.
Industry ethics codes — from the Associated General Contractors, the American Subcontractors Association, and similar organizations — uniformly condemn bid shopping. Many state public works statutes prohibit it. And beyond the ethics and legal frameworks, bid shopping damages the GC-sub relationship ecosystem in ways that cost more long-term than any short-term savings.
Several practices fall under the umbrella of bid shopping:
Forms of bid shopping
- Direct disclosure — the GC tells one sub a competitor's specific number and asks them to match
- Indirect disclosure — the GC reveals the low number without naming the bidder ("we have a bid at X; can you get there?")
- Post-award negotiation — the GC awards the subcontract to a sub at their bid, then demands price reduction before signing
- Bid peddling in reverse — a sub hears about a competitor's bid and unilaterally offers to beat it
- Pre-bid shopping — sharing draft bid numbers before bids are submitted to influence competitive pricing
Some of these are more egregious than others, but they share a common characteristic: the information asymmetry that drives them comes from the GC's position between competing subs. Subs don't know what other subs bid; only the GC does. Leveraging that information to drive bids below what the market would have produced is the essence of shopping.
Industry ethics codes focus on fairness to the subs who submitted bids in good faith. A sub who put substantial effort into a detailed bid reasonably expects that if they're the low responsive bidder, they'll win the work. Using their bid number to get another sub to match breaks that expectation and reduces the sub's incentive to bid the next time.
The broader ethical issue is one of trust. If subs can't trust that honest bidding wins work, they bid differently — either padding bids to protect against shopping (raising everyone's prices), only bidding for GCs they trust, or limiting effort on bids to match the expected shopping (less detailed bids, more exposure on both sides). The market becomes less efficient.
Public works in many states require bid listing and prohibit bid shopping on state-funded projects. California's Subletting and Subcontracting Fair Practices Act, for example, requires the prime contractor to list the specific subs they'll use (and their bid amounts) as part of their own bid. Substituting a different sub post-award requires owner approval and specific justification. Shopping — substituting just for price — is prohibited.
Other states have similar statutes under various names. The common goal: on public money, the sub listed in the bid is supposed to be the sub that does the work, to prevent public contracts from becoming opportunities for GCs to shop among subs after the fact. Violating these statutes can result in loss of the contract, penalties, and debarment from future public work.
On private projects, there's usually no statutory prohibition on bid shopping. The GC has legal freedom to negotiate subcontracts however they want. This is where the ethics framework becomes the primary constraint, along with the business case.
Private contracts sometimes include anti-shopping provisions — the owner requires the GC to use the listed subs at the listed bid amounts unless a specific substitution is approved. These provisions protect the owner from the quality risks of shopping (a lower bid may be a weaker sub) and the schedule risks (sub changes after award cause delays).
Even when legally permitted, bid shopping has long-term business costs that often exceed the short-term savings:
Why bid shopping usually costs more than it saves
- Sub quality degrades — shopping pushes subs to lower prices, sometimes below sustainable levels, producing lower-quality work
- Sub relationships damage — subs who feel shopped are less willing to bid aggressively in future rounds, or drop the GC from their bid list entirely
- Bid padding emerges — subs who expect to be shopped pad their bids upfront so they have room to negotiate down to their real number, which raises the starting point
- Sub availability decreases — when strong subs stop bidding a GC's work because of shopping reputation, the GC is left with weaker options
- Claims and change orders increase — subs squeezed on initial price hunt for change orders to make up the margin
- Safety and quality shortcuts — subs pushed below their cost of quality operate thinner on safety and quality, creating long-term problems
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On a specific project, shopping might save 2-4% on a specific subcontract. Over years of relationships with the best subs, the cost of losing access to those subs and dealing with the downstream effects typically exceeds those specific savings.
Contractors known for clean bidding get better bids over time. Subs protect their relationship with GCs who don't shop by bidding their real numbers early. Shoppers get inflated bids from subs who assume they'll be pushed down.
Legitimate post-bid negotiation is different from shopping. If bids come in over budget, the GC can negotiate value engineering with specific subs — changing the scope to reduce cost. A mechanical sub might bid $500K for the originally specified system; post-bid, the GC and sub might identify alternate equipment or reduced scope that brings the price to $420K. That's scope adjustment, not shopping.
Value engineering negotiations should involve specific scope changes, documented in writing, with clear agreement on what's in and out. Simply asking a sub to lower their price without scope changes is shopping; asking them to propose scope reductions that produce a lower price is fair.
A separate issue is what happens when a sub discovers a material error in their bid after submission but before award. Most jurisdictions allow bid withdrawal in cases of clear clerical errors (a transposed digit, a missing zero) but not for judgment errors (the bidder misestimated labor hours). The mechanics for withdrawing — timeline, documentation, written notice to the GC — vary by jurisdiction.
For GCs, allowing a sub to withdraw their bid when there's a clear error is usually the right call. Forcing a sub to honor a plainly erroneous bid creates a financial distress situation that can play out badly during performance — the sub struggles to complete, quality suffers, defaults become likely. A GC who allows reasonable withdrawal maintains healthier relationships and better long-term outcomes.
Clean bidding practices include specific disciplines:
Practices that support fair bidding
- Written bid instructions that are the same for all bidders
- Specified bid submission deadline after which no bids are accepted or modified
- Bid opening process that doesn't disclose specific competitor numbers to other bidders before award
- Award based on documented criteria applied consistently
- Prompt notification of award and non-award decisions
- Written substitution procedures if changing subs post-award
Bid shopping is using one sub's bid number to negotiate another sub's price down after bid opening. It's condemned by industry ethics codes, illegal on most public work, and damaging to GC-sub relationships even when legally permitted. The short-term savings it produces are usually exceeded by the long-term costs — sub quality degradation, bid padding, relationship damage, and increased claims. Clean bidding practices produce better long-term outcomes for all parties. For GCs, the reputation for fair bidding is worth more than the occasional savings from shopping.
Written by
Jordan Patel
Compliance & Legal
Former corporate counsel specializing in construction contracts and tax compliance. Writes about the documentation layer — COIs, W-8/W-9, certified payroll, notice-to-owner deadlines — and the legal backbone behind audit-ready AP.
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