Why the right questions matter
A blocked drain can go from annoying to urgent very quickly, especially after heavy rain, a big family weekend, or when a laundry, shower or toilet is out of action. In New Zealand, drain cleaning jobs can range from a simple sink blockage to a more serious issue involving tree roots, damaged pipes, stormwater problems or wastewater back-up.
The person you hire should be able to diagnose the problem properly, explain the likely cause, and tell you whether cleaning alone will fix it or whether you may also need repairs. Asking a few smart questions up front can help you avoid repeat call-outs, unclear pricing and unnecessary work.
Use the checklist below to compare drain cleaners before you commit.
1) What experience do you have with my type of drain problem?
Not all drain issues are the same. A good drain cleaner should be able to tell you whether they regularly handle:
- blocked kitchen, bathroom or laundry drains - toilet and sewer line blockages - stormwater drains and downpipes - tree root intrusion - recurring blockages caused by pipe damage or poor fall - drainage issues after Auckland or North Island heavy rain events, where ground saturation can worsen problems
Ask how long they’ve been working in drainage and whether they’ve dealt with similar properties to yours, such as older villas, townhouses, lifestyle blocks or rural homes with longer pipe runs.
Useful follow-up questions:
- Have you worked on homes of this age and construction type? - What do you think is the most likely cause of this blockage? - Do you usually find the cause with cleaning, or do you also inspect the line first?
A drain cleaner who gives a clear explanation is usually more reliable than someone who promises a quick fix without asking questions.
2) Are you properly licensed for the work you’ll do?
This is one of the most important questions in New Zealand. Drain cleaning itself may be a maintenance task, but if the job involves plumbing, drainlaying, gasfitting or other restricted work, it must be done by someone who is authorised to do it.
In NZ, plumbing, gasfitting and drainlaying are restricted trades regulated by the Plumbers, Gasfitters and Drainlayers Board (PGDB). If a contractor needs to carry out drainlaying work beyond simple cleaning, they should hold the relevant licence or be working under supervision as required.
Ask:
- Are you licensed with the PGDB for the work you’ll be doing? - Will you personally do the work, or will a licensed person supervise it? - If the job changes from cleaning to repair or replacement, how will that be handled?
If the issue is more than a blocked pipe — for example, a broken drain, collapsed section or failed connection — it may require repair work that is subject to NZ rules and may also need council involvement depending on scope and location. For some building-related work, a building consent from the local council may be required, so it is worth asking whether any consent, inspection or notification could apply.
3) Do you have insurance, and what does it cover?
Drain work can be messy, and sometimes the process reveals a bigger problem. Good insurance protects both you and the contractor if something goes wrong.
Ask for confirmation of:
- public liability insurance - cover for accidental damage to your property - cover for tools, equipment and vehicles while on site - any relevant professional indemnity cover if advice or inspection is part of the service
You do not need a lecture on policy wording, but you should ask for proof if you are unsure. A professional drain cleaner will not be offended by the question.
Also ask what happens if:
- a pipe is damaged during clearing - wastewater overflows into a garage, bathroom or garden - a council asset or neighbour’s property is affected
In New Zealand, it is better to ask now than deal with a dispute later.
4) What exactly is included in your quote?
Drain cleaning quotes can be confusing because one company may quote for call-out and basic clearing only, while another includes CCTV inspection, jetting, or minor unblocking equipment.
Always ask for a written quote that spells out:
- call-out fee, if any - labour charges and hourly rate, if applicable - after-hours, weekend or public holiday surcharges - equipment charges, such as water jetting or CCTV inspection - whether the price includes GST - whether disposal, access setup or extra labour is included
Here is a simple way to compare quotes:
| Question | What to look for | |---|---| | What does the base price cover? | Cleaning only, or inspection and clearing as well | | Are there extra charges? | After-hours fees, travel, equipment, GST | | Is the price fixed or estimated? | Fixed price gives more certainty | | What if the blockage is worse than expected? | Ask how any extra work will be approved | | Is there a minimum charge? | Helpful for small jobs, but check the total |
If one quote is much cheaper than the others, ask why. It may exclude important parts of the job, or it may rely on a quick temporary fix rather than a proper clean-out.
5) How will you diagnose the problem before you start?
A proper drain cleaner should not just turn up and start blasting water without understanding the issue. Ask what diagnostic steps they use.
Common methods may include:
- asking about symptoms, such as slow drains, gurgling or sewage smell - checking the affected fixtures and access points - using drain rods or mechanical clearing tools - water jetting for more stubborn blockages - CCTV drain inspection to identify cracks, root ingress, sagging or collapsed pipe sections
If the problem keeps coming back, a CCTV inspection can be especially useful. It may cost more upfront, but it can save you from paying to clear the same blockage again and again.
Ask:
- Do you inspect first, or clean first? - Can you show me what is causing the blockage? - Will you provide footage or photos if you do a camera inspection?
A good diagnosis matters because not every blockage is solved by the same method.
6) How long will the job take?
Timeframes are worth clarifying, especially if you are dealing with a household of several people, a rental property, or a business premise. In New Zealand, a straightforward blocked drain may be handled in under an hour, but more complicated jobs can take much longer if access is limited or the blockage is deeper in the system.
Ask:
- When can you attend? - How long do you expect the job to take? - What could make it take longer? - Will you let me know if you find a bigger issue before continuing?
It also helps to ask about availability during winter, when wet weather can increase drainage problems and tradespeople can be busier. If your issue is urgent, make sure the contractor can tell you whether they offer same-day or emergency service.
7) What guarantee or warranty do you offer?
A reputable drain cleaner should be clear about whether they guarantee their work. A guarantee does not mean a blockage will never return, but it does show confidence in the service provided.
Ask:
- Do you guarantee the blockage will be cleared? - If the drain blocks again soon after, what happens? - Is there a time limit on the guarantee? - Does the guarantee cover the same issue only, or any related problem?
Be careful with vague promises like “no worries, mate” without any written terms. If the line has underlying damage, a fair contractor will explain that cleaning can only do so much and that repair may be a separate job.
8) Can you provide references or recent reviews?
References are still useful, especially for larger or recurring drainage jobs. Ask for:
- recent customer references - online reviews from New Zealand customers - examples of similar jobs they have completed - photos of before-and-after work, if available
When checking reviews, look for patterns rather than one-off comments. Consistent praise for punctuality, clear communication and fair pricing is a good sign. Repeated complaints about hidden charges, poor tidy-up or missed appointments are worth noting.
If you are hiring through a property manager, body corporate or landlord arrangement, ask whether the contractor has worked in similar settings and understands tenant communication and access requirements.
9) Will you clean up and leave the site safe?
Drain work can be messy, and a professional should tell you how they will protect your property. This is especially important if they need to work inside the home, in a laundry, under a house, or in a garden bed.
Ask:
- How do you protect floors, walls and fixtures? - Do you clean up wastewater and debris? - Will you reinstate any access panels or covers? - What happens if a section of garden or paving needs to be opened up?
For rural properties, also ask about biosecurity or waste disposal practices if the blockage involves sludge, grease or contaminated material.
10) What should I do before and after the visit?
Good contractors will tell you how to prepare. That may include clearing access to the affected area, parking space for the truck, or locating inspection chambers and manholes.
Before the visit, ask:
- Should I stop using sinks, showers or toilets before you arrive? - Is there anything you need me to move? - Should I turn off water to certain fixtures? - Do I need to keep pets or children away from the work area?
After the job, ask:
- What signs should I watch for if the problem returns? - Do you recommend any maintenance to prevent repeat blockages? - Can you tell me if tree roots, grease build-up or poor pipe condition are likely to be ongoing issues?
Simple prevention advice can save money over time, especially in older NZ homes where pipes may already be vulnerable.
11) How should I choose between two or three drain cleaners?
Getting multiple written quotes is usually the best way to compare fairly. The cheapest option is not always the best value, particularly if it does not include inspection or if the contractor cannot explain the cause of the blockage.
Use this quick checklist:
- Are they licensed for any restricted work they may need to do? - Are they insured? - Is the quote clear and in writing? - Do they explain the diagnosis and next steps properly? - Are timelines realistic? - Do they offer a sensible guarantee? - Do references or reviews look solid?
If one contractor is strong on price but weak on communication, or vice versa, think about the risk of repeat work, property damage and downtime. For a recurring blockage, paying more for a proper inspection may be the better choice.
Final checklist before you hire
Before you book, make sure you can answer these questions confidently:
- What is the likely cause of the blockage? - Is the contractor licensed for any restricted work involved? - Do they have insurance? - Is the quote written, detailed and clear about GST and extra charges? - What equipment and diagnosis methods will they use? - How long will the job take? - What guarantee is offered? - Do they have references or strong local reviews?
A little diligence now can save you a lot of hassle later. The right drain cleaner should welcome your questions, not dodge them.