The Lowest Number Isn't the Whole Story: Reading a Contractor Bid Beyond the Bottom Line

Two Bids, One Building — Very Different Endings

A warehouse developer in the Rio Grande Valley recently reviewed two proposals for the same tilt-wall facility. The first came in at $2.41 million. The second at $2.29 million. On paper, the choice looked obvious.

It wasn't. By project closeout, the "cheaper" bid had grown to $2.68 million — a figure the owner never budgeted for. The pricier proposal finished within two percent of its number. The difference wasn't luck. It was how each contractor structured the bid.

Where the Hidden Costs Live

Exclusions

The least expensive proposals often achieve their price by simply leaving things out. Scan the back pages of a low bid and you'll frequently find language excluding site work, permitting fees, underground utility relocation, or moisture protection. Each exclusion becomes a line item the owner pays for separately — usually at retail rates, after construction has already started.

One Corpus Christi retail build we reviewed excluded all concrete sealing "pending owner selection." The sealing package, once competitively priced in isolation rather than as part of the original bid, ran 40 percent above what it would have cost embedded in the base contract.

Allowances

An allowance is a budget placeholder — $15,000 for lighting, $8,000 for doors and hardware. It sounds responsible. In practice, allowances are frequently set low to compress the bid number. When the actual selections come in above the allowance, the overage flows straight to the owner, often with a markup attached.

Ask any contractor presenting an allowance-heavy bid one direct question: what did the last three projects actually spend against these allowances? If the answer isn't readily available, assume the number is optimistic.

Unit Pricing for Change Orders

Every project has surprises. What matters is the contract price attached to them. Strong proposals include a schedule of unit rates — a set cost per cubic yard of rock excavation, per linear foot of additional ductwork, per hour of added labor. Weak proposals leave change-order pricing open, which means negotiating from a position of zero leverage once the schedule is already compressed.

A Comparison Checklist for South Texas Owners

Before signing anything, line the bids up side by side and verify:

• Scope parity. Are both bidders pricing the same drawings, same specifications, same permit package? A bid based on older drawings isn't comparable.
• Exclusion list. Request it in writing. Then price every exclusion yourself to build a true total.
• Allowance schedule. List every allowance, its amount, and whether unused funds credit back to the owner.
• Unit rate sheet. Change-order pricing locked at contract signing, not negotiated mid-build.
• Markup on changes. Typical ranges run 10–20 percent for overhead and profit on change orders. Anything higher deserves scrutiny.
• Bonding and insurance costs. Confirm whether they're included or passed through.
• Escalation assumptions. On projects starting several months out, ask how steel, concrete, and roofing material pricing is protected.

Total Projected Cost, Not Sticker Price

The discipline is simple: build a spreadsheet with one column per bidder and rows for base bid, priced exclusions, realistic allowance adjustments, and a contingency weighted by how much change-order risk the contract leaves open. That final figure — not the headline number — is what belongs in your pro forma.

South Texas owners who compare bids this way rarely pick the same contractor as those who compare sticker prices alone. And that's usually the point. The best bid isn't the smallest number on the first page. It's the one that still holds up on the last one.