“Fifty percent up-front for materials.” If one sentence separates owner-builders who lose money from those who don’t, it’s how they respond to that one. This guide covers what deposits are actually allowed state by state, what an oversized ask really signals, and how to structure payments so your money stays behind the work.
Caps change and contract types matter — verify with your state authority before paying or refusing a deposit. This is general guidance, not legal advice.
The caps at a glance
| Jurisdiction | Typical residential cap |
|---|---|
| NSW | 10% for home building work |
| VIC | 10% under $20,000; 5% at $20,000+ (major domestic contracts) |
| QLD | 10% under $20,000; 5% at $20,000+; 20% where work is mostly off-site |
| ACT | No universal statutory cap — 10% is accepted practice, more is a flag |
Run any specific ask through the deposit checker — it applies these thresholds to your contract size in thirty seconds.
Why the deposit is a diagnostic
A deposit request tells you about the contractor’s balance sheet. A healthy trade business funds materials from working capital or supplier terms; a business that needs your 40% to start has probably already spent someone else’s 40% finishing the last job. That’s the mechanism behind most “builder took the deposit and disappeared” stories — you weren’t robbed by a criminal, you were the last creditor of a business that had been quietly insolvent for a year.
Structuring the payment schedule
The principle: money follows verified work. Practical rules that survive contact with real trades:
- Minimum legal deposit, or less. Good trades rarely argue; struggling ones always do.
- Stage payments against defined, inspectable milestones — “frame complete and inspected”, not “progress payment 2 of 5”.
- Percentages weighted to the back. Front-loaded schedules (30/30/30/10) leave you paying for promises; back-weighted ones keep the contractor finishing to get paid.
- Retention on the final payment — 5% held until defects from the walkthrough are closed converts “we’ll come back for that” from a hope into an incentive.
- Never pay ahead to “lock in” a start date. A start date bought with money is rented, not locked.
When a trade pushes back
Reasonable pushback exists: genuine long-lead items, custom fabrication, a history with clients who didn’t pay. The difference between reasonable and red-flag is specificity and documentation — a trade who explains exactly what the early money buys, papers it, and accepts staged verification is negotiating; one who repeats “that’s just how we do it” is telling you how it ends.
If a quote’s deposit is off but everything else looks right, that’s exactly the conversation a $290 Quote Teardown arms you for — the findings give you the negotiating language, in writing.