Quick answer
To compare contractor quotes fairly, put every bid on the same scope, add back anything a low bid left out, and then add a contingency of 10 to 15 percent. This calculator shows the spread between three bids, the average, and a planning budget after allowances and contingency.
What to line up before comparing bids
Put each quote through the same checklist. Differences here explain most price gaps between contractors.
| Line item | What to check | Why it moves the price |
|---|---|---|
| Scope of work | Same rooms, same tasks, same finish level | Missing tasks come back later as change orders |
| Material allowances | Dollar amounts for tile, fixtures, flooring, and hardware | A low allowance makes a bid look cheaper than it is |
| Demolition and disposal | Dumpster, haul-away, and dump fees | Often left out of the lowest bid |
| Permits and inspections | Who pulls the permit and who pays the fee | Unpermitted work can cost more to fix later |
| Payment schedule | Deposit, milestone payments, and final holdback | Large early payments shift risk to you |
| Change orders | Written pricing and approval before extra work starts | Verbal changes are the main source of budget overruns |
| License and insurance | Active license, liability, and workers compensation | Uninsured work exposes you to damage and injury claims |
| Timeline and warranty | Start date, duration, and workmanship warranty in writing | Delays and callbacks have real cost |
If a contractor will not put an item in writing, treat it as not included.
How do you compare contractor quotes fairly?
Three quotes for the same job rarely describe the same job. One includes permits and disposal, another carries a small tile allowance, and a third leaves out painting. The calculator starts with the raw spread between the lowest and highest bid so you can see how far apart they are.
It then builds a planning budget: the average bid, plus an allowance adjustment for items you know are under-budgeted, plus a contingency percentage for surprises. The deposit line shows what the requested percentage means in dollars.
The formula
- Quote spread = highest quote - lowest quote
- Average quote = sum of quotes / number of quotes
- Normalized budget = average quote + allowance adjustment
- Planning budget = normalized budget x (1 + contingency %)
- Deposit = average quote x deposit %
Worked example
With the starting values in the calculator (Quote A: $8,500, Quote B: $9,400, Quote C: $11,200, Allowance adjustment: $800, Contingency buffer: 12%, Requested deposit: 25%), the result is $8,500 to $11,200 at an estimated $11,760 planning budget.
- Quote spread = $11,200 - $8,500 = $2,700
- Normalized budget = average $9,700 + allowance adjustment $800 = $10,500
- Planning budget = $10,500 + 12% contingency = $11,760
What this calculator assumes
- Quotes entered as zero are ignored, so the tool also works with two bids.
- The allowance adjustment is a single dollar figure you estimate from the written quotes.
- Contingency defaults to 12 percent.
- The tool compares price only. License, insurance, references, and schedule need a separate check.
Tips for a more accurate estimate
- Ask each contractor to price the same written scope, including demolition, disposal, permits, and cleanup.
- A bid far below the others usually means missing scope or low allowances, not a bargain.
- Tie payments to finished milestones instead of dates, and keep a final payment until the punch list is done.
- Deposit limits vary by state. California, for example, caps home improvement down payments at 10 percent or $1,000, whichever is less.
Contractor Quote Comparison Calculator FAQ
How many contractor quotes should I get?
Three written quotes for the same scope is the usual minimum. It is enough to see the going rate and to spot a bid that is missing something.
Why are contractor bids so different?
Bids differ because of scope, material allowances, overhead, schedule, and how much risk the contractor has priced in. Line-by-line comparison usually explains most of the gap.
How much deposit should a contractor ask for?
It varies by state law, job size, and how much material must be ordered up front. Many small jobs start with 10 to 30 percent. Be cautious with large cash deposits before any work or materials arrive.
Should I choose the lowest contractor quote?
Not automatically. Compare scope, allowance amounts, schedule, insurance, references, and how change orders are handled.
What is a project contingency?
A contingency is money reserved for surprises. Ten to fifteen percent is common for many small remodels.
What are allowances?
Allowances are placeholder budgets for items not fully selected yet, such as tile, fixtures, or hardware.
Use this estimate as a planning starting point. Product coverage, waste, local prices, code rules, and site conditions can change the final amount.