27/10/2026
When buying a house, do you ever think about where all the water goes?
Most people look at the roof, cladding, windows and interior finishes.
But what about the drainage system?
Every home needs to deal with two different types of water.
Wastewater comes from toilets, showers, kitchens and laundries.
Stormwater comes from rain falling on the roof, driveway and surrounding ground.
These systems have different purposes.
In most parts of Auckland, they are managed through separate drainage networks.
Problems can develop when drains become blocked, downpipes are incorrectly connected or surface water is not properly managed.
For example, a gully trap positioned too low may allow rainwater to enter the wastewater system.
When viewing a property, look for visible warning signs such as:
• Disconnected downpipes
• Blocked surface drains
• Water collecting near the house
• Damaged or obstructed gully traps
• Evidence of repeated drainage overflow
A visual building inspection can help identify observable concerns.
However, underground drainage pipes are generally concealed, so a visual and non-invasive inspection cannot confirm their complete condition.
Where concerns are identified, further investigation by a qualified drainlayer may be appropriate.
A house can look tidy above ground while important drainage components remain hidden below.
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