Retention in construction: how much to hold and when to release

Retention is an amount held back from each progress payment rather than paid in full. The point is simple: it gives you a reason for the builder to return and rectify defects after you have moved in, when the incentive to come back for fiddly snagging work would otherwise be small.

Under the current system, once a builder receives the final progress payment, most of your leverage is gone. The money has been paid, the relationship is winding down, and a small list of touch-ups competes with the next job on the builder's calendar. Retention is the structural fix the industry settled on. You keep a small percentage in reserve, and that reserve only becomes the builder's money once they have met defined conditions.

This is not about distrusting your builder. Good builders expect retention and price for it. They finance much of the build out of their own pocket and carry real cash flow pressure, so retention is a shared, understood part of how Australian residential contracts allocate risk. It protects you without treating the builder as the problem.

It also helps to know what retention is not. It is not a penalty, and it is not a discount on the contract price. The held amount is still owed to the builder; it is parked until the conditions for release are met. Treating it as money you might keep, rather than money you are holding in trust until the work is signed off, is where a lot of end-of-build disputes start.

The standard retention amount in Australian residential contracts is 5 percent of each progress payment. Some contracts cap the total retained at 5 percent of the overall contract sum, which matters on larger builds where 5 percent of every stage could add up to more than you actually need as security.

Five percent is the figure most major contract templates default to, and it is usually enough to cover the cost of bringing in another contractor to fix typical defects if your builder does not return. Holding much more can strain the builder's cash flow without giving you meaningfully more protection. Holding much less can leave you short if rectification turns out to be expensive.

Watch the difference between a percentage of each payment and a cap on the total held. Without a cap, 5 percent taken from every progress payment on a large build can leave you sitting on far more than the cost of fixing realistic defects, which is hard on the builder and not really security you need. A cap on the total retained, commonly the same 5 percent figure applied to the whole contract sum, keeps the held balance proportionate. Read the contract closely so you know which mechanism applies to your build.

The retention percentage is negotiable at contract signing, within the ranges the industry treats as normal. Government guidance on building contracts at business.gov.au is a useful starting point for understanding what should be written down before you sign. The key is that the amount, the trigger for half-release, and the trigger for full release are all stated clearly in the contract, not left to a conversation later.

Retention is almost always released in two stages rather than all at once. The first release happens at or shortly after practical completion, the point where the home is reasonably fit to live in even if minor items remain.

At practical completion, the typical approach is to release half of the retained amount. The build is substantially done, you have taken possession, and holding the full retention at this point would be heavier than the remaining risk justifies. Releasing half keeps the builder's cash flow reasonable while you keep a meaningful balance as security through the defects period.

Before you release that first half, do a proper handover inspection and record any defects with photos and dates. The first release should follow practical completion being genuinely reached, not simply the builder asserting it. If significant items are outstanding, practical completion may not have been reached at all, which is a separate conversation from retention.

It is worth being precise about what practical completion means, because the first release hangs on it. It is the stage at which the home is reasonably fit to occupy for its intended purpose, even if a defined list of minor items remains. It is not the same as the build being perfect, and it is not the same as every box being ticked. If a builder pushes for handover and the first release while major work is still open, the right response is to record what is incomplete and hold the line, not to release retention to keep the peace.

The remaining half of the retention is the security that motivates your builder to fix defects after you have moved in. Release the final balance only when the following are true:

Once these conditions are met, the balance is the builder's. Withholding it beyond that point, with no open defects, is not what retention is for and can put you in the wrong.

Disputes over retention usually come down to one question: is the defect actually fixed, and fixed properly? You may think a repair is substandard while the builder considers it done. This is where clear records and a calm process matter most.

Start by putting your concern in writing with photos, referencing the specific defect and what you expected. Give the builder a fair opportunity to return and rectify. If the work still falls short, you may be entitled to use the retained amount to engage another contractor, but the contract terms govern when and how, so read them carefully first.

If you cannot resolve it, this is the point to get advice rather than act alone. State tribunals such as VCAT in Victoria, NCAT in New South Wales, and their equivalents in other states handle residential building disputes, and Legal Aid in your state can point you to the right service. Your home warranty insurance scheme may also be relevant, and many states run a building authority that publishes guidance on defects and dispute steps before a matter reaches a tribunal.

For builders and owners alike, the goal is a documented, fair process, not a standoff over a held cheque. A clean record of the defect, the request to rectify, the work done, and the sign-off resolves most disagreements long before anyone files anything. The cases that drag on are almost always the ones where no one wrote down what was agreed.

This section touches on legal rights, so treat it as general information only. For a dispute about your own build, speak to a lawyer, your state tribunal, or Legal Aid.

Retention does not stop at the head contract. Builders typically hold a similar percentage from their subcontractors, released at the end of the build's defects period for the same reason. Under the current system, this means a subcontractor can finish framing early in a build and not see their retained money until 12 to 18 months later, long after they have left the site.

Subcontractors are last in line by design, not by neglect. The structure holds their money longest while giving them the least visibility over when it will be released. A framer who finished in month two has no easy way to see whether the build has reached practical completion, whether the defects period has run, or whether the head contract retention has even been released to the builder. That information gap is one of the quieter pressures running through residential construction.

Retention-style withholding is one of several mechanisms that decide whether the people who did the work actually get paid. If you want the wider picture of how money moves through the chain, the subcontractor payment chain guide sets it out, and why subcontractors don't get paid covers where the chain breaks.

Retention is one of several ways money sits in reserve during and after a build. They get confused easily, so it helps to keep them separate:

Knowing which bucket a held amount falls into tells you the rule for releasing it. Retention follows the defects clock; the others follow completion, the cap, or the set-off.

On BuildFair, owner deposits and progress payments are held in regulated custody with BuildFair banking partner Kobble (Kobble operates under AFSL 545391, Yondr Money Pty Ltd), separate from the builder operating account, and released only on verified release conditions. BuildFair itself does not hold your funds directly. Withheld retention sits in that project account rather than in anyone's operating cash.

A completion hold applies at practical completion before final release, and retention-style withheld amounts are not released until open defects are resolved. Owners and builders record defects with photo evidence, and rectification is tracked to resolution, so the trigger for release is evidence, not assertion. Every approval and release is written to a double-entry, hash-chained ledger, giving both sides a permanent, tamper-evident record of what happened and when.

That record matters most exactly when retention is contested. Instead of two people remembering a handover differently, there is a dated, tamper-evident trail of every defect raised, every rectification signed off, and every release approved. Settlement is marked only on confirmed bank evidence, so a release reflects money that has actually moved, not a status someone clicked.

The same logic protects subcontractors. Amounts above a sub's payment cap, which is contract value plus approved variations, are withheld in the account rather than paid out, and recorded defect rectification closes before withheld funds release. If you want to see the mechanics, the platform page lays out the flow, and Trust and security covers the custody and ledger side. This is general information about how the platform works, not legal or financial advice; for decisions about your own build or contract, speak to a lawyer, your state tribunal, or Legal Aid.