Most drain cleaning jobs in New Zealand take anywhere from 30 minutes to around 3 hours. A straightforward kitchen sink blockage might be cleared in half an hour, while a badly blocked or root-invaded sewer line could take the better part of a day. The time really depends on the type of blockage, where it is in your drainage system, and the method your tradesperson uses.
What Affects How Long a Drain Cleaning Job Takes?
Several factors influence the time needed to clear a blocked drain:
- Location of the blockage – A blockage close to the fixture (e.g., under the kitchen sink) is usually quick to clear. Blockages deep in the underground drainage system take longer to locate and treat.
- Type of blockage – Grease, soap scum, and hair are generally faster to shift than tree roots, collapsed pipe sections, or compacted debris.
- Access – Easy access to inspection chambers or cleanout points speeds things up considerably. Blocked drains with no accessible cleanout may require digging.
- Method used – Different techniques have different timeframes (see below).
- Age and condition of pipes – Older clay or concrete pipes in many NZ homes can be fragile or misaligned, requiring extra care and time.
Common Drain Cleaning Methods and Their Typical Timeframes
| Method | Typical Duration | Best For |
|---|---|---|
| Plunging / hand auger | 15–45 minutes | Minor blockages at fixtures |
| Electric drain snake (eel) | 30–90 minutes | Moderate blockages in branch lines |
| High-pressure water jetting | 1–3 hours | Grease, roots, heavy build-up |
| CCTV drain inspection + clean | 2–4 hours | Diagnosing and clearing complex issues |
| Drain excavation and repair | Half day to several days | Collapsed or severely damaged pipes |
High-pressure water jetting (often called a jet-blast) is the most common professional method used in NZ. It's highly effective and thorough, but naturally takes longer than a simple snake.
Typical Timeframes by Drain Type
Kitchen and Bathroom Drains
These are usually the quickest to sort. A blocked kitchen sink caused by grease and food scraps, or a bathroom drain clogged with hair and soap, can often be cleared in 30 to 60 minutes.
Toilet Blockages
A straightforward toilet blockage may take 20 to 45 minutes. If the blockage is further down the line or involves a foreign object, it can take longer.
Stormwater and Subsoil Drains
Blocked stormwater drains or subsoil drainage systems can take 1 to 3 hours or more, especially if leaves, silt, or root intrusion are involved. NZ's wet winters mean these are commonly called out after heavy rain.
Main Sewer Line Blockages
A blocked main sewer line is the most serious and time-consuming scenario. Expect 2 to 4 hours for jetting and inspection, and potentially longer if pipe repairs are needed.
Does a CCTV Inspection Add Time?
Yes — but it's often worth it. A CCTV drain camera inspection adds roughly 30–60 minutes to a job, but it gives your tradesperson a clear picture of what's going on inside the pipe. This can save time and money in the long run by avoiding repeat callouts or unnecessary digging. If your drains are blocking repeatedly, ask your drainlayer about a camera inspection.
What You Can Do Before the Tradesperson Arrives
A few simple steps can help speed things up:
- Clear the area around the affected fixture or drain access point.
- Know the location of your inspection chambers (the round or square lids in your yard).
- Avoid using chemical drain cleaners beforehand — these can be hazardous to the tradesperson and may not solve the underlying problem.
- Note when the problem started and whether multiple fixtures are affected (this helps diagnose the blockage location quickly).
When to Call a Professional
While minor blockages at a sink or shower can sometimes be cleared with a plunger or a drain snake from Bunnings or Mitre 10, there are clear situations where you need a licensed professional:
- Multiple fixtures blocked at once – This usually means a blockage in the main drain line.
- Sewage backing up – A health hazard that needs urgent attention.
- Recurring blockages – Could indicate root intrusion, pipe damage, or incorrect fall.
- Slow drains throughout the house – Often a sign of a deeper systemic issue.
- Any work on underground drainage – In NZ, drainlaying is restricted work under the Plumbers, Gasfitters and Drainlayers Board (PGDB). Any connection, disconnection, or alteration to your underground drainage system must be carried out by a licensed drainlayer. This is a legal requirement under the NZ Building Code and the Plumbers, Gasfitters, and Drainlayers Act 2006.
For guidance on what work requires a building consent, check with your local council or visit MBIE Building Performance.
Safety note: Never enter a drain pit or confined space yourself. Drain systems can contain toxic gases. Leave any underground work to the professionals.
A qualified local drain cleaner or drainlayer can be found right here on tradedirectory.co.nz — search for drain cleaning professionals in your area to get the job done safely and efficiently.
Master Plumbers
Certifying Plumber
SiteWise
