How to read and compare contractor bids

This article is for educational purposes only and is not a substitute for professional advice. Local codes, regulations, and best practices vary by region.

You have three bids in front of you. Prices vary. Scopes look similar but have differences. One bid is a paragraph. One is detailed and itemized. One looks professional but is vague.

Reading bids is a skill. You’re looking for clarity, completeness, and whether the contractor actually understands your project.

What a Good Bid Should Include

Project scope: exactly what work is being done. Not “painting” but “painting interior walls, trim, and doors in bedroom and hallway. Two coats, color TBD.”

Materials: what products are being used. Not “drywall” but “5/8 inch drywall, taped and mudded, finish level 4.”

Labor: what work is included. Not “install windows” but “remove existing windows, install new windows with new flashing and sealant, interior and exterior finishing.”

Exclusions: what’s explicitly not included. “Price does not include exterior painting” or “Paint color selection not included.”

Timeline: when the work starts and expected completion date.

Payment schedule: how much is due when. Usually some deposit, progress payments, and final payment on completion.

Warranty or guarantee: what the contractor guarantees if something fails.

Permits and inspections: who’s responsible for obtaining and paying for permits.

Red Flags in Bids

A vague scope: “kitchen remodel $50,000” tells you nothing. How many cabinets? What countertop? What backsplash? Vague scopes hide surprises.

No materials specified: “Electrical work $3000” could mean anything. You don’t know if they’re upgrading the panel or adding circuits.

Contingency language: “Price subject to site conditions” or “Plus additional work if needed.” This means the contractor will charge more if they discover problems. Sometimes necessary, but be wary if every item has contingencies.

No timeline: if the contractor won’t commit to dates, they might not prioritize your project.

No warranty: if the contractor offers no guarantee, that’s concerning.

Comparing Scopes Across Bids

Align each bid to the same project scope. If Bid A includes permits and Bid B doesn’t, note that. Permit costs might be $500 to $2000. That explains price differences.

If Bid A specifies materials and Bid B doesn’t, Bid B is lower risk for the contractor (they can substitute) but higher risk for you (you don’t know what you’re getting).

Create a spreadsheet. List each line item from all bids. Note differences. See where costs diverge.

A kitchen remodel: Bid A includes $15,000 for cabinets. Bid B includes $8,000. That’s a major difference. You need to understand why. Semi-custom vs. stock? Different square footage? Different finishes?

Price Comparison

The lowest bid wins no automatic preference. If bids are $10,000, $12,000, and $15,000 for the same scope, the $10,000 bid might be fine. But if they’re $10,000, $12,000, and $18,000, the $10,000 might involve cutting corners.

A $2,000 difference on a $12,000 project is meaningful. A $8,000 difference on the same project is suspicious and needs explanation.

Ask the contractors about significant differences. “Your bid is $5000 lower than the others on the same scope. How are you achieving that?” Listen to the answer. Sometimes they’ve found efficiencies. Sometimes they’ve underestimated.

Payment Schedule Red Flags

Asking for large deposits (over 50%) before work starts is concerning. 25 to 30% is typical.

Asking for full payment before the job is done is a problem. Holdbacks protect you.

No progress payments: all due at the end. This means if the contractor leaves before finishing, you’ve paid and have no leverage.

Requests for cash or cash payments: these dodge taxes and give you no documentation. Professional contractors accept checks and cards.

When Bids Are Really Different

If one bid is significantly lower or higher, call that contractor.

“I got these other bids around $X and yours is significantly different. Can you explain?” Professionals appreciate this. If they’re embarrassed or defensive, that’s a signal.

A contractor might say “I was able to cut costs through [specific method]” or “I’m using a higher-quality material and that costs more” or “I have a supplier relationship that saves money.” These are reasonable explanations.

A contractor who says “They’re overcharging” without specifics is just talking trash.

Making Your Decision

You’re not just comparing numbers. You’re evaluating whether each contractor understands your project, has thought through the work, and is being straightforward.

A detailed, clear bid from a contractor who asked good questions and explained their reasoning is more valuable than a cheap vague bid.

Bid review is where you level the playing field. Don’t rush it. Take your time understanding what you’re hiring.

© The Whole Home Guide