Customer-Supplied Materials: Who Owns the Risk When Something Doesn’t Fit?
Updated: Sep 4
The customer bought the part, you fitted it — and now it doesn’t work. That’s when a simple job can turn into a very complicated conversation.
G’day, it’s Dazza. Customer-supplied materials are common on trade jobs. Someone has already bought the tapware, light fitting, appliance, tiles, pump, vanity, hot-water unit or some other piece of gear before the tradie arrives.
Sometimes it works perfectly. Sometimes the box gets opened and the part is the wrong size, missing pieces, damaged, unsuitable for the job or simply not compatible with what is already there.
The awkward question then becomes: who owns the problem?
Buying it and installing it are two different things
When the tradie supplies a product, the supply and installation are usually part of the same commercial conversation. Customer-supplied gear splits that conversation in two.
The customer has chosen or purchased the item. The tradie is being asked to install it. That sounds straightforward until something goes wrong and everyone has a different assumption about who checked what.
The customer may think: “You’re the expert — you should have known it wouldn’t fit.” The tradie may think: “I didn’t select it or sell it — I was only asked to install it.” Neither assumption is a very good substitute for a clear record made before the work starts.
The problem is often discovered after the old part comes out
The worst time to discover a mismatch is halfway through the job.
The old fitting is removed. The water or power may be isolated. Packaging is everywhere. Then the new item turns out to need a different connection, more clearance, another component or work that was never included in the original price.
Now there may be extra labour, another supplier run, a return visit or a temporary make-safe job. If nobody recorded that the customer supplied the item — and what was known about it before installation — the later invoice can look like the tradie created the problem.
A quick pre-install check can prevent a much longer argument
Before installing customer-supplied material, it is worth slowing down just enough to record the basics.
What did the customer supply? Is the make or model identifiable? Is the packaging visibly damaged? Are the obvious required parts present? Does anything immediately suggest it may not suit the existing installation? Has the customer been told about any concern before work continues?
That does not mean a tradie must guarantee every product a customer buys or perform an engineering investigation on every box. The point is to make the handover between “the customer supplied this” and “the tradie installed this” visible rather than assumed.
If something looks wrong, record it before changing it
A photo can be particularly useful here. Photograph the supplied item, its label or model number where relevant, and any obvious damage or mismatch before modifying or installing it.
If the customer decides to proceed despite a concern, record what was explained and what they asked you to do. If the item cannot reasonably be installed, record why the work stopped and what is needed next.
The record does not need to sound defensive. A short factual note is usually more useful than a paragraph written after everybody is annoyed.
A customer-supplied product does not make every responsibility disappear
There is an important legal and commercial distinction here. A customer supplying an item does not automatically remove every responsibility from the business installing it, and it does not automatically make the customer responsible for every problem either.
What applies can depend on the contract, the service being provided, what representations were made, the nature of the product, applicable Australian Consumer Law obligations and any trade-specific requirements. This article is practical record-keeping guidance, not legal advice about who is liable in a particular dispute.
If a product is clearly unsuitable or unsafe, “the customer bought it” is not a sensible reason to install it regardless. Equally, if the problem is with the customer’s product rather than the installation, having a clear record of what was supplied and what happened can make the next conversation much easier.
Separate the product problem from the workmanship problem
This distinction becomes especially important when something fails later.
Was the product defective? Was it the wrong product for the application? Was something missing from the supplied kit? Or was there actually a problem with the installation?
Without a record, those questions can collapse into one complaint: “It doesn’t work.” With a few photos, the product details and a short site note, there is at least somewhere sensible to start.
This is another small trade workflow I’m working through
Customer-supplied materials are another trade-admin problem I’m working through with Dazza: how to make the handover clear without creating a giant disclaimer form every time somebody brings their own fitting to the job.
That workflow is still in development. There isn’t a finished Dazza customer-supplied-materials tool I’m asking anyone to use today. The useful principle is much simpler: identify what the customer supplied, note anything that looks wrong, and record the decision before the installation moves on.
Five minutes of clarity is cheaper than guessing later
Most customers are not trying to create a dispute, and most tradies are not trying to avoid responsibility. The trouble usually starts when both sides thought the other person understood something that was never actually recorded.
If the customer supplies the material, make that part of the job record. If there is a concern, capture it before work continues. If the scope changes because the item does not fit, record that change while everyone can still see why.
That little bit of clarity can be worth a lot more than the time it takes to write it down.
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