Pool Builder Red Flags: Warning Signs Before You Sign

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The checkable ones first. In Queensland the maximum deposit before work starts is 5% where the contract price is $20,000 or more, and 10% under $20,000. If the price is fixed it must appear prominently on page one of the contract schedule. Cover applies above $3,300.

The short answer

A deposit above the statutory limit is the clearest red flag there is. Queensland: 10% under $20,000, 5% at $20,000 or more, and 20% at any price only where more than half the work is performed off site.
No price on page one. For Queensland contracts of $20,000 or more, a fixed price must be shown prominently on the first page of the contract schedule. A method of calculation there instead means the price is not fixed.
Allowances everywhere. The QBCC says allowances ‘should be kept to a minimum as the final cost often exceeds the estimate in the contract’. A fixed price full of allowances behaves like an unfixed one.
Verbal variations. All variations must be agreed in writing before the variation work commences, and a price increase for a variation cannot be required to be paid until that work is started.
A licence that does not match the contract. Check the entity named on your contract against the register, not the trading name on the truck. Unlicensed work may not be covered by the warranty scheme.

The red flag, the rule it breaches, and the check that takes two minutes
Red flag	The published rule behind it	How to check	Weight
‘We need 20% up front’ on a $70,000 pool	QBCC: maximum deposit is 5% at $20,000 or more; 20% only where over half the work is off site	Read the deposit clause against the contract price	Serious — a stated limit, not a preference
No fixed price on page one of the schedule	QBCC: for contracts at $20,000 or more the price, if fixed, must be shown prominently on the first page	Turn to page one. Is there a number?	Serious
‘We'll sort the variation out later’	All variations must be agreed in writing before the work commences	Ask for the variation form before agreeing to anything	Serious — variations are a leading cause of disputes
Contract entity differs from the licence holder	Unlicensed work may not be covered under the warranty scheme	Compare the ACN or name on the contract with the register	Serious
Pressure to sign today for a ‘this week only’ price	QLD gives 5 business days cooling off after you receive the signed contract and the guide	Say you will sign next week. Watch what happens to the price	Moderate — behavioural, but revealing
Won't put the program or completion date in writing	The contract must state the Date for Practical Completion, or how it is determined	Look for the date, or the formula that produces it	Moderate
Quote materially cheaper than every other quote	No rule — but compare inclusions before concluding anything	Line the quotes up item by item; cheap is often short	Context — not a flag on its own

Why this list is built on rules rather than instinct

The usual version of this article asks you to trust your gut about a stranger you have met twice, while spending $45,000 to $110,000. That is a poor instrument.

Every item in the table above is anchored to something a regulator has published, which converts a feeling into a test. ‘This deposit feels high’ is an opinion; ‘this deposit is 20% on a $70,000 contract, and the published maximum is 5% unless more than half the work is off site’ is a fact you can put in an email.

Two caveats, stated up front because they matter. The deposit and contract rules quoted here are Queensland's, from the QBCC Consumer Building Guide, and other states set their own limits — our page on deposit limits and progress payments covers the differences. And a single flag is a question, not a verdict. Builders make administrative mistakes. What matters is the answer you get when you ask.

The rule worth remembering: a good builder answers a rules-based question with a document. A bad one answers it with reassurance.

The deposit is the single most informative number

If you check one thing, check this one.

The QBCC publishes the maximum deposit allowed before work starts on site:

10% where the total contract price is less than $20,000;
5% where the price is $20,000 or more;
20% for a contract of any price where the value of work to be performed off site is more than 50% of the contract price.

That third line is the one that gets misused, and it is also the one with a legitimate application. A fibreglass pool is manufactured in a factory, so a genuine argument exists that most of its value is off-site work — we cover exactly that question in why a fibreglass pool builder can ask for 20%. The flag is not the 20% itself. The flag is a 20% deposit on a concrete pool poured in your backyard, where the off-site proportion is obviously small.

After the deposit, progress payments must be directly related to work progress on site and proportionate to the value of the work claimed — the QBCC's own example is that you should not pay 50% until at least half the work is completed on site. A payment schedule front-loaded against a build that has not started is the same red flag wearing a later date.

The behavioural flags, and what each one usually means

These have no rule attached, which is exactly why they are worth naming.

Urgency that belongs to the builder rather than to your project. A price that expires this week, a discount for signing today, a crew that is ‘in your area only this month’. Queensland gives you 5 business days to withdraw after receiving the signed contract and the consumer guide, at a cost of generally $100 plus reasonable out-of-pocket expenses — so the manufactured deadline is arguing against a statutory right. Our page on the Queensland cooling-off period sets out how it works.

Reluctance to put anything in writing. Not evasiveness about price — evasiveness about method. A builder who will not write down what happens if rock is found, or who is responsible for reinstating the over-dig, is not hiding a number; they are leaving a decision open for later, when you have less leverage.

The site walk that does not happen. A quote produced without anyone looking at access, levels, services or soil is a quote that will change. Preparing your block for a pool quote covers what a builder should be looking at.

Dismissing the compliance conversation. Barriers, approvals and certificates are not optional extras, and a builder who treats them as paperwork you can sort out later is telling you who will be sorting it out.

The quotable line: the flag is rarely the price. It is almost always the unwillingness to write something down.

What is not a red flag

Half of getting this right is not panicking about normal things.

Looks alarming	Usually is not
A provisional sum or prime cost item in the quote	Standard practice for items that cannot be fixed at signing. The flag is a provisional sum with no stated basis
A long lead time before excavation	Approvals and scheduling genuinely take time. The flag is a lead time that is never written down
A quote higher than the advertised ‘from’ price	Advertised prices routinely exclude site costs, coping and fencing. See why a quote exceeds the advertised price
A builder declining to match a cheaper quote	Often the most honest thing in the process
Asking for a soil test before fixing a price	Good practice. It removes the uncertainty a cost plus contract would otherwise transfer to you

The cheapest protection available is the boring one: check the licence on the register, read the deposit clause against the price, and compare three quotes line by line rather than on the total. You can get a quote from several builders and apply the table above to each of them.

Common questions

What is the maximum deposit a pool builder can ask for?

In Queensland the QBCC publishes the maximum deposit before work starts as 10% where the contract price is less than $20,000, 5% where it is $20,000 or more, and 20% for a contract of any price where the value of work performed off site is more than 50% of the contract price. Other states set their own limits, so check the rule that applies where you are building.

Is it a red flag if the quote has provisional sums in it?

No, not by itself. Provisional sums and prime cost items are normal for work that can be described but not priced at signing. What matters is whether each one states its basis, what happens if the actual cost differs, and how many there are. A fixed price containing a large number of allowances behaves like an unfixed price, which is why the QBCC says allowances should be kept to a minimum.

How do I check a pool builder's licence?

Each state runs a public register, and you search the exact entity named on your contract rather than the trading name used in marketing. A licence that is current but held by a different company, or that does not cover this class of work, produces the same outcome as no licence at all. Our guide to checking a pool builder's licence sets out where each register is.

Should I be worried if one quote is much cheaper?

Treat it as a prompt to compare inclusions rather than as a verdict. Pool quotes vary enormously in what sits inside the contract price, particularly excavation and spoil removal, coping, paving, fencing and the electrical work. Line three quotes up item by item and the cheap one is usually shorter rather than better value, though occasionally it is genuinely leaner.

Can a builder change the price after I sign?

Only through the mechanisms the contract and the law allow, which generally means agreed written variations and the operation of prime cost and provisional sum items. The QBCC requires all variations to be agreed in writing by the home owner before the variation work commences, and a price increase for a variation cannot be required to be paid until that work is started.

Sources

General information only, current at 2026-09-22. Pool rules differ by state and by council, and penalty amounts are updated regularly. Confirm your own obligations with your council or a registered inspector before acting.

Pool builder red flags: what to watch for before you sign