Estimate vs quote vs bid: what a contractor's price commits you to

The short version

Contractors use three words for a price: estimate, quote and bid. People often treat them as the same thing. They are not, and the difference decides how much the final bill can move.

• Estimate. An approximate cost based on what the contractor knows today. The final price can be higher or lower.

• Quote. A stated price for a defined piece of work. Once you accept it, you usually have a contract on those terms.

• Bid. A price submitted in competition with other contractors, usually against plans or a scope you supplied. A bid can be firm or approximate. Read it to find out which.

The label at the top of the page is a starting point, not the answer. A document called "Quote" can still contain lines such as "price subject to site conditions." A document called "Estimate" can contain a firm, itemized price. Read the wording on price changes before you rely on the heading.

What official guidance says

Australia. Western Australia's Consumer Protection agency says a quote is "a statement of the price for which goods or services will be supplied" and that "when a quote is accepted, a contract is formed." It describes an estimate as an approximation whose price is not fixed. Queensland's Office of Fair Trading also says that when you accept a quote, you have formed a contract.

Canada (Ontario). Ontario's consumer guidance says that if an estimate is included in your contract, the final price generally cannot be more than 10% over that estimate unless you agree to new work or a new price. Other provinces have their own rules, so check your provincial consumer protection office.

United States. No single federal rule defines these words for home improvement. The Federal Trade Commission (FTC) recommends getting several written estimates that describe the work, materials, completion date and price, and not automatically choosing the lowest one. Some states set their own contract rules. California, for example, requires a written contract for home improvement projects over $500, according to its Contractors State License Board (CSLB).

Why the difference costs money

Say you collect two prices for the same bathroom. These are synthetic samples with fictional companies.

Sample A, Northgate Renovations (synthetic): "Estimate: $9,800. Final price depends on conditions found after demolition."

Sample B, Harbor Line Builders (synthetic): "Quote: $10,400 fixed for the scope listed below. Valid 30 days. Changes only by signed change order."

A looks $600 cheaper. But A has told you in writing that the price can move, and it has not said by how much. If the subfloor needs repair, A's final bill can go well past B's. B has committed to a number for the listed work, and any change needs your signature.

Neither is automatically the better choice. A fixed quote often includes a buffer for risk, so it can come in higher. An estimate can be fair when nobody can see inside a wall yet. What you want is to know which one you have, and how far the price can move.

How to tell what you're holding

Read the document for these signals.

Signs it's an estimate:

• Words such as "approximately," "estimated," "budget" or "ballpark."

• Lines such as "final price based on actual time and materials."

• No itemized scope, or a scope that says "as required."

• Hourly rates instead of a total.

Signs it's a firm quote:

• A single total for a listed scope.

• A validity period, such as "valid for 30 days."

• A statement that changes need a written, signed change order.

• Specific materials, quantities or model numbers.

Signs of a mixed document:

• A fixed total plus allowances, such as "tile allowance: $1,200." An allowance is a placeholder budget. If you spend more, you usually pay the difference.

• Exclusions such as "permits by owner" or "disposal not included."

• An "unforeseen conditions" clause that lets the price rise after the work starts.

Most renovation quotes are mixed. That is normal. The goal is to know which parts are fixed and which can move.

Questions to ask before you accept

1. "Is this a fixed price for the scope listed, or an estimate?"

2. "Which lines could change, and what would cause that?"

3. "If the price changes, how will you tell me, and will you wait for my written approval before doing extra work?"

4. "How long is this price valid?"

5. "Did you charge for this quote? If so, was that fee agreed in advance?" Western Australia's guidance says a business that charges for a quote must tell the customer the cost before preparing it.

Ask for the answers in writing, by email or on the document itself. A spoken promise is hard to prove later. The FTC also advises getting any promises made in conversation written into the contract.

Turning an estimate into something you can compare

If one contractor gives an estimate and another a quote, you cannot compare the totals directly. Try this:

1. Ask the estimating contractor for a "not to exceed" figure, or a firm price for the parts they can see.

2. Ask both contractors to price the same written scope.

3. For each moving part, ask for a unit price, such as a price per square foot of subfloor replaced.

4. Write each contractor's worst-case total next to its best-case total.

Our guide on how to compare contractor quotes walks through a side-by-side comparison in more detail. To check whether a quote covers the basics, see what a contractor quote should include.

Common traps

• The cheap estimate that grows. A low estimate wins the job, and the price climbs once the work starts. Western Australia's guidance notes that an unreasonably low estimate used to win work may give the customer grounds to cancel. Rules differ by state and province.

• The expired quote. The quote was valid for 14 days, and you signed on day 30. The contractor may reprice.

• The quote that's really an estimate. The heading says "Quote," but a clause says "pricing subject to change." The clause usually governs, not the heading.

• The verbal upgrade. You agree on site to a better faucet, and it appears on the final invoice at a price you never saw. Ask for every change in writing first.

Get a second pair of eyes on your contractor's price

EasyToDecode is launching soon. It will read the quote or estimate you upload, quote the exact lines that let the price change, flag missing items such as permits or disposal, and draft questions you can send the contractor. See how it works or join the waitlist to hear when it opens.