What to do when you have underquoted

In this article

Everybody does this. You will do it again. The difference between operators who survive it and operators who do not is entirely in what happens in the next forty‑eight hours.

The word on the document decides everything

This is the part almost nobody in the trades is told, and it is worth more than the rest of this article.

	A quote	An estimate
What it is	A fixed price for a defined scope.	A considered projection of likely cost.
Once accepted	Generally binding. You have agreed to do that work for that money.	Not a fixed price. Ordinarily not enforceable as one.
Room to move	Only by agreement — a signed change order.	Some, within reason, and less than you would like.
What usually happens	The customer holds you to it, and is entitled to.	You still have to justify every dollar of the difference.

Two things follow from that. First, go and read what you actually sent, including the heading and the small print, before you pick up the phone — not after. Second, if your documents say “estimate” at the top and “this price is fixed” underneath, you have the worst of both and it needs fixing today.

And check your own state. Several require any change to a home improvement contract to be agreed in writing before the work is done, and some cap how far over a written estimate you may go without written authorisation — commonly around 10%. Verbal agreement on a driveway is not a change order anywhere. In practice you are not paid for the work you performed; you are paid for the work you can show was agreed.

The fork: did the job change, or did you?

Be honest here, on your own, before you talk to anybody. It decides everything that follows and it is very tempting to get wrong.

• The job changed if you found something nobody could have seen from the quote — rot behind the render, a second layer nobody mentioned, a customer who has since asked for three more things. That is a change order, and you are entitled to be paid for it.
• You got it wrong if the work is exactly what you looked at and you simply mispriced it. You measured badly, forgot the disposal, used last year’s material cost, or wanted the job.

The middle case is the common one: some of both. Split it. Charge for the genuine change, absorb the part that was your error, and say plainly which is which. Customers accept that conversation far more often than operators expect, and they can smell an inflated change order that is really a rescue.

If the job changed: stop, then write

The order matters, and it is the opposite of what instinct tells you.

• Stop before you do the extra work. Work performed before it is agreed is work you are hoping to be paid for. Every payment dispute in this trade starts here.
• Tell them the day you find it, not the day you invoice. A surprise on Tuesday is a problem. The same surprise on the final bill is a betrayal.
• Photograph it before you cover it up. The single most useful thing you will do all week.
• Put it in writing with three things: what specifically is being added, the extra cost, and the effect on the finish date.
• Get it signed or replied to before you carry on. An email saying “yes go ahead” is worth having; a nod in a driveway is not.
• Price it properly. Change work is genuinely more expensive than planned work — it interrupts the sequence. Do not price it as if it were in the original run.

If you got it wrong: finish it

This is the answer most of the time, and it is worth being direct about why.

You quoted it. They accepted. Going back to a customer to say “I mispriced this, please pay me more” is asking them to pay for your mistake, and even when they agree, you have spent goodwill worth more than the money. If the job is genuinely lost‑money rather than merely disappointing, you are usually still better off finishing it well, being paid, and never repeating it.

What to do with the loss:

• Do not cut quality to claw it back. A bad finish costs you the review, the referrals and quite possibly a callback, all to save a few hundred dollars.
• Do not slow down and pad the hours. If it was a fixed price, that is not available to you anyway, and if it was hourly it is fraud.
• Do not disappear. The single most damaging response, and the most common. A job that stalls at 70% is where complaints to licensing boards come from.
• Do write down what it actually cost the day you finish, while you still remember. That number is the entire value you get out of this job.

The sunk cost trap is worth naming. Once you are three days into a five‑day job, the three days are gone whatever you decide. The only real question is whether the remaining work earns more than it costs. Usually it does — you have already absorbed the mobilisation and the setup — which is another reason finishing is normally right.

When walking away is the right call

Rare, and it is not a free option. Abandoning a job you contracted for can put you in breach, and in some states it puts your licence at risk. But it is occasionally correct:

• Finishing would cost more than the penalty for not finishing — and you have worked that out on paper rather than felt it at 6am.
• The work cannot be done safely to the standard you would sign your name to.
• The customer has already broken the agreement — not paid a stage, refused access, directed unsafe work.
• The relationship has become abusive. This is a real reason and you are allowed to use it.

If you do it: get advice first, put it in writing, offer a fair reckoning of work done and money held, and hand over what you have. Do not walk off site and stop answering the phone.

Making sure it does not happen again

Underquoting is not bad luck. It is a measurement problem, and cash‑flow trouble is behind the large majority of small business failures — around 82% — while roughly 19% of trade contractors do not survive their first year and 44% are gone within five. Most of that is not lost jobs. It is jobs won at the wrong number.

• Cost every job when it finishes. Actual hours, actual materials, against what you quoted. Ten minutes, and it is the only thing that makes next year’s quote better than this year’s.
• Find the pattern. It is almost never random. It is a job type, a customer type, or a specific thing you consistently forget — disposal, access, the second coat, the drive.
• Price from your own history, not your memory. The gap between how long you think a job takes and how long it takes is the whole problem.
• Stop quoting from photographs for anything substantial. It is faster right up until it is not.
• Write the exclusions down. Half of what turns into an underquote was never in the quote; it just was not excluded either.
• If you are consistently under, your rate is wrong, not your estimating. Start at why charging by the hour is costing you money, then how to raise your prices.

What to stop doing

• Using “quote” and “estimate” interchangeably. Pick the right one deliberately for each job and make the document say so.
• Absorbing genuine scope changes to keep the peace. That is not goodwill, it is an unbudgeted discount, and it trains the customer.
• Telling them at the end. Always the day you find it.
• Quoting the job you want it to be rather than the one in front of you.
• Letting it go unrecorded. An underquote you never measured will happen again on the next one exactly like it.

Sources

Checked in August 2026. Contract rules vary by state — treat the legal points here as the questions to ask, not as advice for your jurisdiction.

• Forbes, why trade contractors fail — the survival figures, drawn from BLS, and the cash‑flow share of business failures.
• California Contractors State License Board, home improvement contracts — one state licensing board’s rules on written contracts and written change orders, and a good model for the questions to ask about your own.
• ConsensusDocs on scope of work — from the industry contract standards body, on why changes belong in writing before the work rather than after it.
• The quote‑versus‑estimate distinction is general contract principle rather than one statute, and the practical effect varies by state and by how your own document is worded. If a job is large enough to hurt, it is large enough to ask a lawyer about once.