How to Compare Contractor Quotes Line-by-Line
Most quote comparisons fail because the bids are quoting different things. Normalize first, then compare.
Red flags in contractor bids
- Lump-sum totals with no line items
- "Permits by owner" buried in the quote
- Vague material descriptions ("standard shingles")
- Verbal-only warranty terms
- 50%+ deposit requested
- Significantly under other bids on the same spec
What the spread usually means
If three bids on the same spec land within 15% of each other, you're comparing similar contractors and quality. A spread of 30%+ usually means the lowest is omitting scope, the highest is over-engineering, or both. Always investigate the outliers.
Compare contractor quotes in 5 steps
Compare contractor quotes in 5 steps
- 1Write a shared spec sheet
List exactly what work you want — materials, brands, dimensions, finishes. Every bidder works from the same document.
- 2Require itemized bids
Labor, materials, permits, disposal, mobilization, contingencies, and warranty as separate lines. Reject lump-sum quotes.
- 3Identify each bid's omissions
Read each bid line-by-line against your spec. Highlight what's missing. The lowest bid often omits the most.
- 4Normalize the totals
Add an estimate for each omission. The corrected totals often re-order the bidders.
- 5Weight non-price factors
License, insurance, references, warranty length, schedule fit. A 15% premium for a 3-year warranty often beats a cheap 1-year.
Popular searches
Related calculators
Frequently asked questions
How many quotes should I get for home projects?
Three is the sweet spot. Two won't show you the spread; four+ rarely changes your decision.
Should I show contractors competitors' quotes?
Generally no — it can encourage matching the lowest price by cutting scope. Sharing only the spec sheet keeps quotes honest.
What if the lowest bid is much lower than others?
Read it line-by-line for omissions. Often the lowest bid skips permits, disposal, contingencies, or uses lower-grade materials. After normalizing, it's often no longer the lowest.
What's a fair payment schedule?
10% deposit (or $1k, whichever less), then progress payments tied to defined milestones, with 10% withheld until punch list is complete.
Search another homeowner question
Costs, repair vs replace, financing, insurance — get an answer in seconds.
Estimates and guidance are educational. Always confirm with a licensed local professional before making decisions.