Having a blocked drain is one of those household headaches that can escalate quickly. When you book a drain cleaner, knowing what to expect helps you prepare, ask the right questions, and understand the work being done. Most visits follow a clear process: assess, diagnose, clear, and advise — and a good tradesperson will keep you informed at every step.
Before the Tradesperson Arrives
When you call to book, be ready to describe the problem as clearly as you can. Is it a slow-draining sink, a gurgling toilet, a smell coming from the floor waste, or a completely blocked drain outside? The more detail you give, the better equipped the drain cleaner will be when they arrive. Some companies offer a fixed call-out fee, while others charge by the hour — ask upfront so there are no surprises.
Clear the area around the affected drain if you can. Under-sink cupboards, bathroom vanities, and outdoor drain access points should be accessible. This saves time and may save you money.
The Initial Inspection
Once on site, a drain cleaner will start with a visual inspection of the affected area and any accessible drain access points (also called inspection chambers or manholes). They'll ask you questions about when the problem started, whether it's getting worse, and whether multiple fixtures are affected at once.
If multiple drains in your home are slow or blocked simultaneously, this often points to a main drain blockage rather than a localised one — something the tradesperson will want to rule in or out early.
CCTV Camera Inspection
Many drain cleaners carry a CCTV drain camera — a flexible cable with a camera head that is fed into the drain to show exactly what's going on inside the pipe. This is particularly useful for:
- Locating the exact position and nature of a blockage
- Identifying tree root intrusion, which is very common in older NZ suburbs
- Spotting cracked, collapsed, or misaligned pipes
- Checking the condition of pipes after clearing
Some companies include a camera inspection in their standard call-out; others charge separately. Ask before they start. A reputable tradesperson will show you the footage or at least explain what they found.
Clearing the Blockage
Depending on what the inspection reveals, the drain cleaner will choose the right method to clear the blockage:
| Method | Best For |
|---|---|
| Electric eel (drain snake) | Grease, hair, soft blockages in smaller pipes |
| High-pressure water jetting | Stubborn blockages, root intrusion, grease build-up in larger pipes |
| Root cutting attachment | Tree roots that have grown into the pipe |
| Manual rodding | Simple, accessible blockages |
High-pressure water jetting is the most thorough method and leaves the inside of the pipe clean. It's commonly used on main drains and stormwater lines.
After the Blockage Is Cleared
Once the drain is flowing freely, a good drain cleaner will:
- Run water to confirm the drain is clear
- Carry out a post-clear camera inspection if the blockage was significant
- Explain what caused the problem and how to prevent it recurring
- Advise whether any pipe repairs or replacements are needed
If pipe damage is found — such as cracked earthenware pipes (common in homes built before the 1980s) or root-damaged sections — the tradesperson should give you a written quote for repair work before proceeding. Drainlaying work (repairing or replacing underground drainage pipes) is restricted work under the Plumbers, Gasfitters and Drainlayers Act 2006. It must be carried out by, or under the supervision of, a licensed drainlayer registered with the Plumbers Gasfitters & Drainlayers Board. Always check their licence before work begins.
Building Consents and Compliance
Simply clearing a blocked drain does not require a building consent. However, if new drainage work is needed — such as replacing a section of underground pipe or altering the drainage layout — a building consent may be required depending on the scope of work. Some minor repairs may fall under Schedule 1 exemptions of the Building Act, but you should always confirm with your local council before work begins. The MBIE Building Performance website has useful guidance on what requires consent.
Costs: What's Typical?
Drain cleaning costs in New Zealand vary depending on location, the complexity of the job, and whether specialist equipment like CCTV cameras or water jetters are used. As a rough guide, a standard call-out and drain clear can range from around $150 to $400+, with more complex jobs or pipe repairs costing considerably more. Always ask for a written quote or at least a clear explanation of how you'll be charged.
When to Call a Professional
You should always call a qualified drain cleaner or licensed drainlayer if:
- Multiple drains are blocked or slow at the same time
- There is sewage backing up into your home
- You notice subsidence (ground sinking) near drain lines
- There are persistent bad smells from drains despite cleaning
- A DIY attempt with a plunger or drain cleaner product hasn't worked
For anything beyond a simple plunger job, it's worth getting a professional in. Attempting to clear drains with harsh chemical products can damage older pipes and is not recommended by most tradespeople. You can find qualified local drain cleaners and drainlayers on tradedirectory.co.nz.
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