Scroll through almost any melbourne pipe relining provider’s website and you will see the same bold numbers repeated everywhere, 25 years, 35 years, 50 years, sometimes even “lifetime.” These figures are genuinely impressive, but they are also frequently misunderstood, because the warranty being advertised is often only one piece of a two-part promise, and the second piece is usually far shorter than the headline number suggests. This guide breaks down what a relining warranty actually covers, the critical difference between the product warranty and the workmanship warranty, and what to ask before accepting any long-term guarantee at face value.
How Long Should a Relined Pipe Last?
A correctly installed epoxy or resin liner, from a reputable manufacturer, is generally expected to perform for several decades under normal conditions, often in the range of 50 years or more, since the cured liner effectively becomes a new structural pipe in its own right rather than a temporary patch. This expected lifespan is separate from the warranty period itself, since a warranty is a safety net against early failure, not a prediction of the exact day the pipe will eventually need attention again.
What Does a 50-Year Warranty Actually Mean?
In almost every case, a “50-year warranty” refers specifically to the product or material warranty backing the resin and liner system itself, covering defects in the materials used, not the quality of the installation. This is an important distinction, because the installation is generally where problems are more likely to occur if something does go wrong, and the installation is typically covered by a separate, usually much shorter, workmanship warranty. A 50-year headline figure sounds like a single comprehensive guarantee, but it is almost always only describing one half of the full picture.
Is the Warranty From the Manufacturer or the Plumber?
Both, but they are two distinct warranties with two different parties standing behind them. The product warranty is issued by the manufacturer of the resin and liner system, covering material defects. The workmanship warranty is issued by the plumbing company that carried out the installation, covering errors or defects in how the work was actually performed. A homeowner should expect to see both clearly stated separately in writing, rather than a single vague figure that doesn’t specify which party is responsible for what.
What’s the Difference Between Product and Workmanship Warranties?
The product warranty protects against the liner material itself failing, defects in the resin, flaws in the lining material, or the product not performing as the manufacturer specifies, assuming it was installed correctly according to their guidelines. The workmanship warranty protects against the installation itself being done incorrectly, a liner that wasn’t properly sized, positioned, or cured, poor preparation of the original pipe before installation, or junctions that weren’t reinstated properly. If a relined pipe fails, which warranty applies depends entirely on whether the cause was a material defect or an installation error, which is why it matters that both are clearly defined from the outset.
Does the Warranty Cover Installation Failure?
Only the workmanship warranty covers this, and this is exactly why its length matters as much as, if not more than, the headline product warranty figure. A long product warranty paired with a very short workmanship warranty, for example, a 50-year product warranty alongside only a 6-month workmanship warranty, is worth questioning carefully, since installation errors are generally the more likely cause of early failure in a relining job, not the resin material itself.
Does It Cover Tree Roots Returning?
Generally, no, if the roots are entering through a new point rather than the specific section that was relined and warrantied. A warranty covers the material and workmanship of the relined section itself, not the broader risk of tree roots finding a different entry point elsewhere along the pipe in the future. If roots do manage to re-enter specifically through a poorly reinstated junction within the warrantied section, this may fall under the workmanship warranty, since it relates to how that junction was reinstated rather than external root activity more broadly. This distinction is worth clarifying directly with your plumber before work begins.
Does It Cover Failed Junction Reinstatement?
Generally, yes, this is a workmanship matter. Reinstating junctions correctly after a liner has cured is a precise, skill-dependent part of the installation process, and a junction that fails to reinstate properly, or that later develops a leak or blockage due to incorrect reinstatement, is typically considered a workmanship issue rather than a product defect, assuming the liner material itself performed as expected.
Does Ground Movement Invalidate It?
This varies by provider, but significant ground movement, subsidence, or external damage beyond normal conditions is commonly excluded from both product and workmanship warranties, since neither the manufacturer nor the installer can reasonably be held responsible for damage caused by external forces outside their control. It is worth asking specifically what external events are excluded under your warranty terms, since this can vary between providers and liner systems.
Is the Warranty Transferable if the House Is Sold?
Often, yes, for the product warranty, since it is generally tied to the installed material itself rather than to the original customer, meaning it typically transfers with the property to a new owner. The workmanship warranty is less consistently transferable and depends entirely on the specific plumbing company’s terms, so this is worth confirming directly, particularly if you are planning to sell the property in future or are purchasing a property where relining work has previously been carried out.
What Documentation Should Homeowners Receive?
A properly documented relining job should come with a written warranty certificate clearly stating the product warranty period and the workmanship warranty period separately, the name of the liner manufacturer and system used, the date of installation, and the specific conditions that would void either warranty. If you are only given a verbal assurance of “50 years” with nothing in writing specifying these details, it is reasonable to ask for proper documentation before the job is considered complete.
Should Before-and-After CCTV Footage Be Retained?
Yes, and this is one of the most practically useful things a homeowner can insist on. Before-and-after CCTV footage provides clear, objective evidence of the pipe’s condition prior to relining and the quality of the completed installation afterward, including confirmation that junctions were properly reinstated and the liner was correctly positioned throughout. This footage becomes genuinely valuable if a warranty claim is ever needed, since it gives both the homeowner and the company a clear baseline to assess against, rather than relying on memory or assumption about what the original condition and completed work actually looked like.
What Happens if the Company Stops Trading?
This is one of the more overlooked risks with long workmanship warranties specifically. A product warranty backed directly by a major manufacturer generally remains valid even if the installing company stops trading, since the manufacturer, not the installer, stands behind that specific promise. A workmanship warranty, however, is only as reliable as the company that issued it, and if that company closes down, a workmanship warranty tied to them can become effectively unenforceable. Asking how long a company has been operating, and whether their workmanship warranty is backed by any form of insurance or industry association, is a reasonable question before relying heavily on a long workmanship guarantee.
What Should You Ask Before Accepting a “Lifetime” Guarantee?
Before signing off on any relining quote advertising a long-term or lifetime warranty, it is worth asking directly:
- What is the product warranty period, and what is the workmanship warranty period, stated separately?
- Which specific liner manufacturer and system is being used?
- What specific conditions or events would void either warranty?
- Is the product warranty transferable if the property is sold?
- Is the workmanship warranty transferable, and under what conditions?
- Will before-and-after CCTV footage be provided and retained?
- How long has the company been trading, and is their workmanship warranty backed by insurance or an industry body?
A reputable provider should be able to answer every one of these clearly and in writing, without needing to hedge or redirect back to the headline number alone.
Understand What You’re Actually Being Promised
A 50-year warranty sounds like total peace of mind, but it only tells half the story unless the workmanship warranty is clearly spelled out alongside it. Understanding the difference between what the manufacturer stands behind and what your plumber stands behind is the single most useful thing you can do before committing to a relining job, since it is the workmanship side of the equation that determines what actually happens if something goes wrong in the years after installation.
King and Sons Plumbing provides clear, written warranty terms for every relining job across Melbourne, covering both the product and workmanship separately, along with before-and-after CCTV documentation for your records. Call 03 9993 7122 to discuss your relining project.
