Estimate vs. Quote vs. Bid: What's the Difference?
By BRIX Editorial Team · Updated
An estimate is an approximate price that can change once work starts. A quote is a fixed price for a defined scope, usually valid for a set period. A bid is a formal price submitted to compete for a job, often against other contractors on the same plans. A proposal adds scope, options and terms around the price.
Key takeaways
- Estimate = best guess, can change. Quote = fixed price for a defined scope. Bid = competitive offer on someone else's specs.
- What you call it matters less than what it says. State the scope, what can change the price, and how long the price is valid.
- Use estimates when the job has unknowns, and quotes when you can see the whole job.
- Most residential jobs are won on quotes, not bids, and the follow-up decides more of them than the price does.
What's the difference between an estimate, a quote and a bid?
| Estimate | Quote | Bid | Proposal | |
|---|---|---|---|---|
| What it is | Approximate price | Fixed price for a set scope | Formal competitive price | Price plus scope, options and terms |
| Can the price change? | Yes, within stated limits | Only through a change order | Only per the bid terms | Depends on the terms written in it |
| Who writes the scope? | Contractor | Contractor | Usually the owner, architect or GC | Contractor |
| Typical use | Repairs with unknowns, early budgeting | Most residential service and install work | Commercial, public and new-construction work | Larger residential jobs, multiple options |
| Detail level | Low to medium | Medium to high | High, follows bid documents | High |
| Becomes a contract when | Usually it doesn't on its own | Customer signs or accepts it | Owner awards and both sign | Customer signs it |
What is an estimate?
An estimate is the contractor's best calculation of what a job will cost, given what can be seen before work starts. It's useful when there are real unknowns: a leak behind a wall, a drain line you haven't scoped, a roof deck you can't see under the shingles. A good estimate says what it's based on and what could change it, often with a range or a not-to-exceed amount.
What is a quote?
A quote is a firm price for a defined scope of work. If the customer accepts it within the stated validity period, you do that work for that price, and anything outside the scope becomes a change order. Quotes work best when you can see the whole job: a water heater swap, an AC replacement, a panel upgrade, a fence.
Many trades shops quote in good, better, best options, which lets the customer choose a price rather than a yes or no. Quoting from a flat-rate pricebook keeps prices consistent across techs.
What is a bid?
A bid is a formal price submitted to win a contract, usually against other contractors pricing the same plans and specs. Bids are standard in commercial, public and new-construction work, where the owner, architect or general contractor writes the scope and the lowest qualified or best-value bid wins. Bid terms often say how long the price holds and how it can be withdrawn.
What is a proposal?
A proposal is a quote dressed for a bigger decision. It includes the price, a detailed scope, options, timeline, warranty, payment terms and often a short case for why you. Remodelers, roofers and HVAC replacement salespeople commonly send proposals, and the signed proposal frequently becomes the contract.
Which one should you use?
| Trade | Usually an estimate | Usually a quote or proposal | Usually a bid |
|---|---|---|---|
| HVAC | Diagnosing intermittent problems | System replacements, repairs after diagnosis | New construction and commercial installs |
| Plumbing | Hidden leaks, drain and sewer work before camera | Water heaters, fixture installs, repipes | New construction rough-in |
| Electrical | Troubleshooting, older homes with unknown wiring | Panel upgrades, EV chargers, generators | Commercial tenant buildouts |
| Roofing | Repairs where decking condition is unknown | Full replacements (with per-sheet decking price) | Commercial reroofs, multi-family |
| General contracting and remodeling | Early budgeting before design is final | Fixed-scope remodels after design | Public and commercial projects |
| Landscaping and lawn care | Cleanups of unknown size | Installs and seasonal maintenance contracts | HOA and commercial maintenance contracts |
| Cleaning | One-time deep cleans of unknown condition | Recurring residential service | Commercial janitorial contracts |
Is an estimate legally binding?
An estimate on its own usually isn't a binding promise to do the work at exactly that price, but once a customer signs it or you start work on it, it can become part of a contract. What protects you is the wording: say it's an estimate, state what it's based on, give a range or not-to-exceed amount, and require written approval before exceeding it. Rules vary by state, especially for home improvement and auto repair.
How do you write an estimate or quote customers say yes to?
- Send it fast. Same day, ideally before you leave the driveway. A quote that arrives in four days competes with the contractor who quoted on site.
- Write the scope in plain words. The customer should understand exactly what they're buying.
- Offer options. Two or three choices beat a single take-it-or-leave-it number.
- State validity and what changes the price. 'Valid 30 days. Hidden rot priced at $95 per sheet.'
- Make it easy to accept. E-signature and a deposit link, not 'call us to schedule'.
- Follow up. Most unsold quotes aren't lost to price; they're lost to silence. See how to follow up on an estimate.
Common mistakes
- Calling a fixed price an estimate (or the reverse). Customers hear 'estimate' as 'it might go up' and 'quote' as 'that's the price'. Use the word that matches what you mean.
- No expiry date. A quote accepted 8 months later at last year's material prices loses money.
- One-number quotes. No options means no upsell and a yes-or-no decision.
- No follow-up. Sending the quote is half the sale. Following up is the other half.
- Free estimates for jobs that need real diagnosis. Charge a diagnostic fee where finding the problem is the work.
Frequently asked questions
Is a quote more binding than an estimate?
Generally yes. A quote is a fixed price for a stated scope, so once accepted you're expected to do that work for that price, and changes go through change orders. An estimate is an approximation that can change, ideally within limits you've stated in writing.
Should contractors charge for estimates?
Many contractors offer free estimates for straightforward installs and replacements, where the estimate is a sales visit. For diagnostic work, where finding the problem is the job, charging a diagnostic or trip fee is common and fair. Some credit the fee toward the repair if the customer goes ahead.
How long should a quote be valid?
Commonly 15 to 30 days for residential work, shorter when material prices are moving. State the validity period on the quote so you're not held to old pricing months later.
Can a contractor charge more than the estimate?
It depends on the wording and your state's rules. If the estimate states what could change the price and you get the customer's written approval before going over, charging more is normal. Going over without approval invites disputes, and some states limit it for certain types of work.
What's the difference between a bid and a proposal?
A bid prices a scope someone else wrote, usually in competition with other contractors. A proposal is written by the contractor and sells their own scope, options and approach along with the price. Residential work mostly runs on proposals and quotes.
Do estimates or proposals sync to QuickBooks?
Many field service and quoting tools can send accepted estimates or the resulting invoices to QuickBooks. Check whether the sync carries estimates themselves or only invoices and payments, and whether it's one-way or two-way. See QuickBooks for contractors.
Related
- What Is a Scope of Work?What a scope of work is, the sections every contractor SOW needs, a filled-in example, and the exclusions that prevent disputes and unpaid extra work.
- What Is a Change Order?What a change order is, what it must include, how to price one with overhead and profit, and how to track change orders so extra work gets paid.
- How to Follow Up on an EstimateA step-by-step estimate follow-up schedule for contractors: when to call, text and email, what to say, how long to keep going, and how to close the loop.
- What Is Good-Better-Best Pricing?Good-better-best pricing gives customers three options on one estimate. How to build tiers that differ in value, price each to a margin, and present them.
- What Is Close Rate?Close rate is the share of estimates you sell. Learn the count and dollar formulas, see contractor examples by trade, and what a too-high close rate means.
- Contractor Estimate TemplateFree contractor estimate template with scope, price breakdown, options, exclusions and a signature line. Filled HVAC example and trade tips.
- Estimate Follow-Up Templates (Text and Email)Free estimate follow-up templates: a 30-day sequence of texts, emails and call notes for contractors, with a filled HVAC example and texting consent rules.
- Contractor estimating software that quotes on site and chases every open estimateBuild contractor quotes on site, follow up every open estimate by text and email, and turn won work into jobs, invoices and QuickBooks entries.
- How to Price Contracting Jobs for Profit: The Complete GuideHow to price trades jobs: true labor cost, overhead per billable hour, profit margin, materials markup and flat rates, with worked numbers.
- Scheduling and Dispatch Software That Puts the Right Crew on Every JobScheduling and dispatch that puts the right crew on the right job by skills, location and availability, with jobs booked straight from the phone.
Sources
- FTC: Buyer's Remorse: The FTC's Cooling-Off Rule May Help (checked October 12, 2026)
- FTC: FTC Approves Changes to Cooling-Off Rule ($25 in-home threshold retained) (checked October 12, 2026)