Most reputable drain cleaning companies in New Zealand will offer some kind of workmanship guarantee — but whether that guarantee covers a recurring blockage depends heavily on why the drain blocked again. Understanding what's typically included (and excluded) can save you frustration and help you ask the right questions before you hire.
What a Drain Cleaning Guarantee Usually Covers
A standard guarantee from a professional drain cleaner generally covers the workmanship — that is, the actual clearing of the blockage they were called to fix. If the same blockage returns within the guarantee period (commonly 30 to 90 days, though this varies by company), a reputable operator should return and re-clear it at no extra charge.
Key things typically covered:
- The drain being fully cleared at the time of the job
- Re-attendance if the same section of pipe blocks again within the stated period
- Any damage caused by the tradesperson's equipment during the job
What Is Usually NOT Covered
This is where many homeowners get caught out. Guarantees almost always have exclusions, and drain cleaning is no different.
Common exclusions include:
- Structural pipe issues — If the drain blocked again because of a collapsed pipe, tree root intrusion, or a misaligned joint, that's a separate (and bigger) problem. Clearing the blockage doesn't fix the underlying cause.
- Repeat misuse — If someone in the household flushes wet wipes, cooking grease, or other unsuitable material down the drain after the job, the guarantee won't apply.
- Pre-existing conditions — Pipes that are heavily corroded, cracked, or have significant root damage may be noted as at-risk at the time of the job, with the guarantee limited or excluded.
- Slow-build blockages — A gradual build-up of grease or scale that re-accumulates over weeks is often considered normal maintenance rather than a workmanship failure.
Always read the guarantee terms carefully before signing off on the job, and ask the tradesperson to explain any exclusions in plain language.
Why Blockages Sometimes Return Quickly
If your drain blocks again within days of being cleared, it's worth understanding the likely cause:
| Cause | What it means | Fix needed |
|---|---|---|
| Tree root intrusion | Roots regrow quickly after cutting | Root treatment or pipe relining/replacement |
| Collapsed or cracked pipe | Debris catches on damaged pipe wall | Pipe repair or replacement |
| Partial clearance | Blockage wasn't fully removed | Re-clear under guarantee |
| Ongoing misuse | Wrong items going down the drain | Behaviour change + clear |
| Grease build-up | Fats solidify on pipe walls | Hydro-jetting + regular maintenance |
A CCTV drain inspection (where a camera is fed through the pipe) is the best way to find out exactly what's going on. Many drain cleaning companies offer this as an add-on, and it's well worth the cost if blockages keep recurring.
How to Protect Yourself Before the Job
Before work starts, take these steps to make sure you're covered:
- Get the guarantee in writing — verbal promises are hard to enforce. Ask for the terms on the invoice or a separate document.
- Ask specifically what is and isn't covered — especially if you suspect tree roots or old pipes.
- Request a CCTV inspection if the blockage has happened more than once, so the root cause is identified.
- Check the tradesperson is qualified — drainlaying work in NZ is restricted work under the Plumbers, Gasfitters, and Drainlayers Act 2006. Anyone carrying out drainlaying must be licensed with the Plumbers Gasfitters & Drainlayers Board. Always ask to see their licence or check the PGDB register.
Your Rights as a Consumer
Even without a specific company guarantee, you have rights under the Consumer Guarantees Act 1993. Services must be carried out with reasonable care and skill. If the drain cleaner failed to properly clear the blockage or caused damage, you may have grounds for a remedy regardless of what their guarantee says.
Consumer NZ has useful guidance on your rights when tradespeople don't deliver what was promised.
For rental properties, landlords should also be aware that maintaining functional drainage is part of their obligations under the Healthy Homes Standards, so recurring drain issues need to be addressed promptly.
When to Call a Professional
Always use a licensed drainlayer or plumber for anything beyond simple drain clearing — including:
- Replacing or repairing underground drain pipes (this is restricted drainlaying work under NZ law)
- Any work that connects to the public sewer or stormwater system
- Installing new drainage (which may require a building consent — check with your local council, as some drainage work falls under Schedule 1 exemptions but many does not)
- Recurring blockages that suggest a structural pipe problem
You can find qualified, local drain cleaning professionals on tradedirectory.co.nz. Always get at least two quotes and ask each tradesperson about their guarantee terms upfront.
Master Plumbers
Certifying Plumber
SiteWise
