What are the biggest red flags in a contractor bid?

The ten most common contractor bid red flags are: stated total does not match line-item sum, broad general allowance language, missing demo or disposal scope, duplicate line items, unclear material grade, labor rate far above local market, large unexplained overhead line, no license number or unverifiable license, exclusions hidden in footnotes, and pressure to sign before clarification.

How do math errors show up in a contractor bid?

Math errors show up as a gap between the sum of all line items and the stated contract total, as unit-price-times-quantity calculations that do not match the extended price, or as subtotals that do not roll up correctly to the page total.

What allowance language should you question in a contractor bid?

Question any allowance described as 'general,' 'miscellaneous,' or 'contingency' without a specific scope description. Also question allowances where the dollar amount is not plausible for the stated material grade or local market.

Reference

Contractor Bid Red Flags Before You Sign

Most renovation cost surprises are visible in the contractor bid before you sign. Here are the ten most common red flags a licensed GC looks for when reviewing a bid. With a description of why each one matters.

TL;DR. 10 contractor bid red flags

Stated total does not match line-item sum
Broad "general allowance" language
Missing demo, disposal, or permit assumptions
Duplicate line items
Unclear material grade
Labor rate far above local market
Large unexplained overhead line
No license number or unverifiable license
Exclusions hidden in footnotes
Pressure to sign before clarification

Get My Bid Reviewed

What are the biggest contractor bid red flags?

1

Stated total does not match line-item sum

Add every line item yourself. If the sum does not match the stated contract total, ask for a written explanation before signing. A $60,000 gap between line items and the stated total is not a rounding error. It is unexplained revenue for the contractor.
2

Broad "general allowance" language

An allowance is a placeholder for an unknown cost. A "general allowance" with no scope description is a blank check. The contractor can assign any cost to it later. Require itemization before signing.
3

Missing demo, disposal, or permit assumptions

Demolition, debris removal, dumpster fees, and permit costs are real costs that belong in the bid. If they are absent with no explicit exclusion note, they will reappear as change orders once work begins.
4

Duplicate line items

The same scope item appearing on page 1 and page 3 under different headings. Demo listed under "GC work" and again under "prep". Means you are being charged twice. Common in bids assembled from multiple sub-quotes.
5

Unclear material grade

A tile allowance of $8,000 could cover basic ceramic or high-end porcelain. Without a material specification (grade, brand, or price per square foot), the allowance number is meaningless as a budget control.
6

Labor rate far above local market

Labor rates vary by ZIP code and trade. A rate more than 30–40% above the local median is worth questioning. Either the scope is more complex than described, the contractor is padding margin, or you are being quoted out-of-market rates.
7

Large unexplained overhead line

Every contractor charges overhead and profit. An overhead line that equals 15–25% of the project is normal. An overhead line without a percentage basis, or one that substantially exceeds industry norms, needs an explanation.
8

No license number or unverifiable license

A contractor performing regulated home improvement work in New York or California is required to carry an active state or city license. If no license number is listed in the bid, or if the license number does not appear in the public database, do not sign.
9

Exclusions hidden in footnotes

A bid with a clean scope section and three pages of footnotes is not a clean bid. Read the footnotes. Any scope exclusion buried at the bottom of the document needs to be moved up into the main scope section and priced before signing.
10

Pressure to sign before clarification

"This price is only good through Friday" and "I have another client interested" are not reasons to sign a contract with unresolved questions. A contractor with a clean bid does not need to rush your decision. Take the time to get answers in writing.

How do math errors show up in a bid?

Arithmetic problems in contractor bids take four main forms:

1A gap between the sum of all line items and the stated contract total. No labeled overhead or profit line to explain the difference.
2A unit-price-times-quantity extended price that does not match the line item total. Common when bids are prepared manually or copied from prior jobs.
3Trade-section subtotals that do not add up to the page total.
4The same scope item appearing in multiple sections and being summed twice into the total.

A Bid Defense Memo identifies all four types of math problems and reports the dollar gap with the line-by-line documentation.

What allowance language should you question?

Question allowances that are:

1Labeled "general," "miscellaneous," or "contingency" without any scope description.
2For materials (tile, fixtures, appliances) without a stated price-per-unit assumption.
3Below the realistic market range for the specified material or finish grade.
4Combined into a single line for multiple material categories that should be tracked separately.

Allowance overruns are one of the most common sources of renovation cost overruns. Understanding allowance adequacy before signing is the primary way to prevent them. See scope normalization for how allowances affect bid comparisons.

What missing scope can cost you later?

Items most commonly missing from contractor bids that generate change orders after signing:

1Demolition and debris disposal.
2Permit fees (building, electrical, plumbing, mechanical).
3Structural repairs or reinforcement discovered during demo.
4Asbestos or lead abatement in older buildings.
5Electrical panel upgrade or service run.
6Plumbing rerouting or drain work required by permit.
7HVAC work beyond the basic listed equipment.

When should you get a bid reviewed?

A professional bid review is most useful when one or more of the following apply:

1The contract total is over $50,000 and you have not worked with this contractor before.
2The bid includes broad allowance language you cannot evaluate without market knowledge.
3One bid is substantially lower than the others and you want to know why.
4You are using leverage (hard money, private capital, partnership funds) and need a defensible budget.
5The contractor pushed back when you asked for itemization or clarification.

A Bid Defense Memo from CostCheckGPT covers all ten red flags above as part of a standard review. $249 per bid. 12-hour delivery.