Most solar installers I know have a line somewhere in their terms that says something like “title to the goods does not pass to the customer until payment is received in full.” It sits there in the fine print, and it makes everyone feel a bit safer. If the customer doesn’t pay, you’ll just take the panels back. Simple.

Except it usually isn’t. The moment your crew bolts the rails to the rafters, lands the panels and the inverter goes on the wall, that clause may be worth very little. I’ve watched installers find this out the hard way, standing in a customer’s driveway with an unpaid invoice and a lawyer telling them the gear on the roof isn’t really theirs to take anymore.

Every generic explainer on this topic is written for trade suppliers selling pallets of stock. None of them deal with what happens when the goods become part of a house. So let’s deal with it.

What a retention of title clause actually does

A retention of title clause, often called a Romalpa clause after the English case that made it famous, separates possession from ownership. The customer gets the goods now, but legal title stays with the seller until the price is paid (Sprintlaw, n.d.a). If the buyer defaults or goes broke, the seller’s argument is that the goods were never the buyer’s property in the first place, so the seller can recover them.

For a wholesaler shipping inverters to an installer, that’s a genuinely useful tool. The stock sits on a shelf in the installer’s shed, it’s identifiable by serial number, and it can be picked up and carted away. Lawyers who draft these clauses generally note they work best when goods stay identifiable and haven’t been mixed into something else or transformed (Aitken Whyte Lawyers, n.d.).

Look at the sample wording floating around online and you’ll see the same pattern: clauses built around goods that remain separate, movable and traceable (Law Insider, n.d.). That’s the assumption baked into the template. A solar install breaks that assumption on day one.

The fixtures problem nobody warns you about

Australian property law has a long-standing idea called a fixture. When a chattel (a movable thing) is attached to land or a building with enough permanence and for the purpose of improving the property, the law generally treats it as part of the land itself. Once that happens, ownership tends to follow the land, not the original seller’s paperwork.

Think about what a typical residential install involves. Rails fixed through the roof into the structure. Panels clamped to the rails. An inverter mounted on the wall and hard-wired into the switchboard. A system connected to the network and designed to stay there for decades. Whether something has become a fixture depends on the degree and purpose of attachment, and a commissioned solar system ticks a lot of the boxes courts usually look at.

I’m not a lawyer, and the outcome on any particular job turns on its facts and your state’s law. But the general risk is clear enough that every installer should plan around it: once a system is installed and connected, there’s a real chance your retention of title claim is extinguished, because the panels are no longer “goods” in the ordinary sense. They’re part of the customer’s house.

There’s a second layer to this. The personal property securities regime that gives retention of title its teeth is built around personal property. Interests in land generally sit outside it, so a security interest over goods can lose much of its practical force once those goods are treated as part of the land. If you need certainty on how this plays out for your contracts, get specific advice from a lawyer who knows construction and securities law.

What that means on the ground

Here’s the practical consequence. A retention of title clause drafted for movable trade goods gives you very little real recourse once the system is commissioned. Even if you had an arguable claim, think about what enforcing it would look like:

Even in the rare case where the law sided with you, the cost and the reputational hit would usually wipe out whatever you recovered. In twenty years around this trade, I’ve never seen “repossess the system” turn out to be a sensible collection strategy for a residential job. The clause is a comfort blanket, not a plan.

So the real question isn’t how to word your retention of title clause better. It’s how to make sure you’re never relying on it.

What actually protects you: get paid before the risk lands

The fix is boring and it works. Structure the money so that by the time the system is on the roof, most of it is already in your account.

Deposits and milestone payments

A sensible deposit at contract signing, followed by milestone payments tied to real events (equipment ordered, install day, commissioning), shrinks the amount you’re exposed to at the point the fixtures problem kicks in. The gap between what you’ve spent and what you’ve collected is your actual risk, and a decent payment schedule keeps that gap small.

I’ve written separately about how to set up milestone billing for solar installs, and about what customers are entitled to around deposits. The short version: be clear, be reasonable and get it in writing.

Signed terms of trade before anything happens

Your terms need to be signed before you order stock or book a crew. Not on install day. Not emailed afterwards. Clear terms of trade set out payment timing, what happens on default, interest on late payment and your recovery costs (Sprintlaw, n.d.b). They won’t stop a determined non-payer, but they turn a messy argument into a straightforward debt claim.

Too many installers I know still run on a quote, a verbal yes and a handshake. That’s fine right up until it isn’t.

PPSR registration, done early

If you do take a security interest over equipment, registration on the Personal Property Securities Register (PPSR) matters, and timing matters more. Commentators on retention of title consistently warn that an unregistered or late-registered interest can be defeated, particularly if the buyer becomes insolvent (Sprintlaw, n.d.a; Aitken Whyte Lawyers, n.d.).

The rule of thumb is to register before the goods are supplied, not after. But be realistic about what it buys you. For a residential install, PPSR registration mostly protects you in the window between delivery and installation, such as gear dropped on site a few days early. Once the system is fixed to the house, the fixtures issue above comes back into play. For commercial work, equipment leasing or anything genuinely removable, it can be more useful. Talk to a lawyer about your specific setup.

Cooling-off rights and consumer guarantees come first

This is where a lot of installers trip up while trying to protect themselves. A retention of title clause or security interest doesn’t override a customer’s statutory rights.

If the sale was unsolicited (door-knocking, an outbound call, anything where the customer didn’t approach you), the Australian Consumer Law gives the customer a cooling-off period and places limits on what you can do during it (ACCC, n.d.a). In general terms, that means you can’t simply take a big deposit and roll a crew in before the cooling-off window has closed. Legal guides make the point that cooling-off rules vary by contract type and jurisdiction, so you need to know which ones apply to your sales channel (Sprintlaw, n.d.c).

The practical upshot is sequencing. Your contract should set the deposit and install date around the cooling-off period, not on top of it. I’ve covered how solar cooling-off and cancellation works in more detail if your sales process involves unsolicited approaches.

Consumer guarantees work the same way. The customer is entitled to work done with due care and skill and goods of acceptable quality, with rights to repair, replacement or refund when something goes wrong (ACCC, n.d.b). If a customer is withholding payment because of a genuine defect, your title clause doesn’t trump their consumer guarantee rights. Fix the fault, document it, then chase the money. Government guidance for solar buyers also points customers toward state fair trading bodies and tribunals when disputes stall (energy.gov.au, n.d.), so assume any dispute you mishandle may end up there.

Statutory recourse after the system is installed

So the system is on, the customer hasn’t paid, and repossession is off the table. What’s left?

Security of payment legislation

Every state and territory has security of payment laws designed to get contractors in the building and construction industry paid quickly, through a payment claim and adjudication process rather than a full court case (Queensland Building and Construction Commission [QBCC], n.d.a). In Queensland, that’s the Building Industry Fairness (Security of Payment) Act, and guides on it stress that strict timeframes and the form of the claim really matter (Boss Lawyers, n.d.). A claim that doesn’t meet the requirements can fail on a technicality (PayClaim, n.d.).

One big caveat. In many jurisdictions these schemes exclude or limit contracts made directly with a homeowner for work on their own residence. So for straight residential retail work, security of payment may not be available at all. Where it really earns its keep is commercial installs, and subcontracting, where you’re installing for another solar retailer or builder and they’re the ones not paying. Check how your state’s scheme treats your type of contract before you rely on it.

Retention trusts

If you subcontract on larger or commercial jobs in Queensland, retention trust requirements may apply, where retention money held back from contractors must be kept in a trust account rather than used as the head contractor’s working capital (QBCC, n.d.b). Industry guidance explains who has to open these accounts and when (Housing Industry Association [HIA], n.d.), and the regulator’s trustee guide goes through the detail (QBCC, n.d.c). Whether a particular solar job falls in scope depends on the contract value and type, so treat this as something to check, not assume.

The ordinary debt route

For most residential non-payment, you’re back to the standard toolkit: letters of demand, a small claims or tribunal application, and a debt collector if it comes to that. This is exactly why your signed terms matter. A clean contract, a clear invoice and a documented history of the work make this route far quicker.

The same problem runs up the supply chain

Here’s the bit that keeps wholesalers up at night. Your suppliers almost certainly have retention of title clauses in their credit terms with you. When you install their panels on a customer’s roof, their claim over those goods may disappear in exactly the same way yours does.

That’s why trade credit with equipment suppliers is really a judgement about you, not about the stock. Having sat on the supplier side for years, I can tell you credit managers know their title clause is only really useful while stock is still sitting in your shed. Once it’s installed, they’re relying on your cash flow and your reputation. Installers who pay on time, communicate early when a job slips and don’t stretch terms get more room when things go sideways.

It also cuts the other way. If your business ever hits trouble, uninstalled stock in your warehouse may still be claimed back by suppliers with properly registered interests. That’s worth knowing if you’re stocking up ahead of a price rise. I’ve written more about building supplier relationships that hold up under pressure, and if things get really tight, about director liability for insolvent trading.

A simple checklist for your next contract

Before your next job, check your paperwork against this:

  1. Terms signed before stock is ordered. No signature, no order.
  2. Deposit and milestones that track your costs. Your exposure on install day should be small.
  3. Cooling-off respected. Deposits and install dates sequenced after any cooling-off window.
  4. PPSR registration where it makes sense, done before goods are supplied, with realistic expectations for residential work.
  5. Final payment due at or before commissioning, with the trigger clearly defined.
  6. Your recovery path known in advance. Know whether security of payment applies to this contract type in your state before you need it.
  7. Defects handled first. Fix genuine faults promptly so a payment dispute doesn’t turn into a consumer guarantee dispute.

Where I’m going with this

Chasing unpaid jobs after the system is already on someone’s roof is one of the most common cash flow holes I see in this trade. Almost every time, the problem started weeks earlier: a deposit that was never collected, terms that were never signed, or a milestone nobody tracked.

That’s part of why I’m building CurrentFlow. It’s designed to track deposits, milestone payments and contract terms against each job, so you can see at a glance what’s owed, what’s secured and when the next payment falls due, before the crew is on the roof. It’s still pre-launch. If that sounds useful, join the waitlist and I’ll let you know when early access opens.

Whatever tools you use, the lesson is the same. Your retention of title clause isn’t your safety net once the panels are fixed to the house. Your payment structure is.

References

ACCC. (n.d.a). Contracts. Australian Competition and Consumer Commission. https://www.accc.gov.au/consumers/buying-products-and-services/contracts

ACCC. (n.d.b). Repair, replace, refund, cancel. Australian Competition and Consumer Commission. https://www.accc.gov.au/consumers/problem-with-a-product-or-service-you-bought/repair-replace-refund-cancel

Aitken Whyte Lawyers. (n.d.). Retention of title clauses. https://www.awbrisbanelawyers.com.au/retention-of-title-clauses/

Boss Lawyers. (n.d.). Security of Payment Act Queensland: How to use the BIF Act to get paid. https://bosslawyers.com.au/security-of-payment-act-queensland-bif-act-guide/

energy.gov.au. (n.d.). Dispute resolution. Australian Government. https://www.energy.gov.au/solar/solar-retailers-and-installation/dispute-resolution

Housing Industry Association. (n.d.). Requirements for retention trust accounts. https://hia.com.au/resources-and-advice/working-with-contractors/requirements-for-retention-trust-accounts

Law Insider. (n.d.). Retention of title sample clauses. https://www.lawinsider.com/clause/retention-of-title

PayClaim. (n.d.). How to write a payment claim under the Security of Payment Act Australia. https://payclaim.com.au/how-to-write-a-payment-claim-under-the-security-of-payment-act-australia/

Queensland Building and Construction Commission. (n.d.a). Industry guide to security of payment laws [PDF]. https://www.qbcc.qld.gov.au/sites/default/files/documents/guide-security-payment.pdf

Queensland Building and Construction Commission. (n.d.b). Trust accounts. https://www.qbcc.qld.gov.au/running-your-business/trust-accounts

Queensland Building and Construction Commission. (n.d.c). Trustee guide: Retention trusts [PDF]. https://www.qbcc.qld.gov.au/sites/default/files/documents/guide-trustee-retention-trusts..pdf

Sprintlaw. (n.d.a). What is a Romalpa clause (retention of title) in Australia? https://sprintlaw.com.au/articles/what-is-a-romalpa-clause-retention-of-title-in-australia/

Sprintlaw. (n.d.b). Terms of trade for renewable energy businesses in Australia. https://sprintlaw.com.au/articles/terms-of-trade-for-renewable-energy-businesses-in-australia/

Sprintlaw. (n.d.c). Cooling-off periods in Australian contracts: Essential legal guide. https://sprintlaw.com.au/articles/cooling-off-periods-in-australian-contracts-essential-legal-guide/

FAQ

Can I take solar panels back if the customer doesn’t pay?

In most residential cases, not in any practical way. Once panels and an inverter are fixed to the house and connected, they’re likely to be treated as fixtures, which can defeat a retention of title claim. Even where a claim survived, the cost of removal, making good the roof and disconnecting usually outweighs what you’d recover. Get legal advice on your specific situation.

Is a retention of title clause still worth having in my solar contract?

Yes, but as a minor backstop, not your main protection. It may help in the window between delivery and installation, and for genuinely removable equipment. Your real protection is a signed contract, a sensible deposit and milestone payments that keep your exposure small on install day.

Should I register on the PPSR for residential solar jobs?

It can protect equipment delivered to site before it’s installed, and registration should happen before goods are supplied, not after. For residential work, its value drops sharply once the system is fixed to the property. For commercial jobs, leased equipment or larger supply arrangements it’s more worthwhile. A lawyer can tell you whether it’s worth the admin for your business.

Can I use security of payment laws against a homeowner?

Often not. In many states and territories, contracts made directly with a homeowner for work on their own residence are excluded or limited under security of payment schemes. These laws are most useful for commercial installs, or when you’re subcontracting to another business that hasn’t paid you. Check your state’s rules for your contract type.

Can I start an install during the cooling-off period to lock the customer in?

If the sale was unsolicited, the Australian Consumer Law restricts what you can supply and what payment you can take during the cooling-off period. Starting work early to “lock in” a customer is a compliance risk, not a protection. Sequence your deposit and install date to start after the cooling-off window closes.