Receiving three bids for a trade and simply picking the lowest number is not estimating; it's gambling. Bid leveling is the meticulous process of normalizing subcontractor proposals so that the General Contractor can make an exact, "apples-to-apples" comparison.
When a bid is 15% lower than the competition, it's rarely because that subcontractor is 15% more efficient. It is almost always because they missed a scope item. If the GC doesn't catch that omission during leveling, the GC will end up paying for it out of their own contingency.
The Anatomy of a Bid Leveling Sheet
A professional bid leveling matrix breaks down the trade scope into granular line items. Instead of comparing total lump sums, the GC forces the subcontractors to provide breakouts for specific systems, allowances, and alternates.
Key Columns in a Leveling Matrix
- Base Bid: The lump sum number submitted.
- Specified Alternates: Add/Deduct pricing for owner-requested changes (e.g., changing VCT flooring to polished concrete).
- Bond Rate: The cost to provide Payment and Performance bonds.
- Exclusions & Qualifications: The most important part of the bid. What are they explicitly refusing to do?
- Added by GC (The "Plug"): The cost the GC must add to a subcontractor's bid to cover items the sub excluded, bringing the bid up to a level playing field.
Missed: Rock Excavation & Export
Earthwork is notoriously risky. A subcontractor who submits a low bid by excluding hard rock excavation or hazardous soil export is shifting the geotechnical risk entirely back onto the GC.
During leveling, we mandate that the earthwork contractor provides a unit rate for rock removal. If Subcontractor A includes 500 CY of rock removal in their base bid, and Subcontractor B explicitly excludes all rock, Subcontractor B's bid must be penalized (plugged) by the cost of 500 CY of rock removal to make it an apples-to-apples comparison.
Common Exclusions to Watch For
When reviewing subcontractor proposals, pay close attention to the fine print. Common exclusions that require GC "plugs" include:
- Temporary Facilities: Does the electrical sub provide temporary lighting strings, or is the GC responsible?
- Hoisting & Crane Time: Is the mechanical sub paying for their own crane rental to set the RTUs, or do they expect to use the GC's tower crane for free?
- Premium Time / Off-Hours Work: If the municipality requires heavy deliveries or lane closures to happen at 2:00 AM, did the sub include the shift differential?
- Winter Conditions: Did the concrete sub include ground heaters and thermal blankets, or did they exclude "winter protection"?
The "Plug" Methodology
When leveling, if Subcontractor A's bid is $100,000 but excludes crane rental (valued at $5,000), their Leveled Bid is $105,000. If Subcontractor B's bid is $103,000 and includes crane rental, Subcontractor B is actually the lowest responsible bidder, even though their raw base bid was higher.
GC Bid Leveling Excel Template
Download our free, macro-enabled bid leveling matrix used for commercial projects.