Timber Power Pole Rot: How to Spot It Before Your Pole Falls

Timber poles are the workhorses of Sydney's private power network. Most suburbs built before about 2005 still have timber on private blocks. They're affordable and tough — until rot sets in. Rot is silent, hidden, and the number-one reason private poles fall over in storms. Here's how to catch it before it catches you.

The three kinds of timber pole rot

1. Ground-line rot (the dangerous one)

This is what kills 90% of timber poles in Sydney. It starts in the bottom 30 cm of the pole — just at or below soil level — and works inward. By the time the outside looks bad, the inside has often already hollowed out.

2. Top rot

Caused by rain sitting on cross-arm connections or in cracks at the top of the pole. Less common on private poles because they don't usually carry complicated hardware, but worth a look.

3. Internal heart rot

The timber rots from the centre outward. Sometimes you can see a hole or vertical crack; sometimes you can only tell by the hollow sound when it's tapped. Most common in poles over 30 years old.

Signs to look for from the ground

You don't need tools. Once a year, walk around your pole in good daylight and check for:

• Soft, spongy timber at the base. Press firmly with a screwdriver handle (not the tip). A sound pole feels rock-hard. A rotting pole feels like dense styrofoam.
• Darkened or blackened timber near ground level.
• Fungus or mushrooms growing out of the pole (not just on it). This is a near-guaranteed sign of active rot.
• Fine sawdust around the base — termites love rotting timber.
• Vertical cracks that run deep (more than 1 cm wide at the surface).
• A hollow sound when you tap the base with a stick. A solid pole thuds; a hollow pole rings.
• Ants, termites, or a trail of mud on the pole surface.
• A worsening lean year over year.

What causes timber pole rot?

1. Moisture — gardens, lawns, poorly-drained ground around the base.
2. Fungus — opportunistic after moisture, particularly in shaded or damp spots.
3. Termites — especially in older suburbs with heavy tree cover.
4. Cut or damaged treatment — modern poles are CCA-treated (copper chrome arsenate) which is an excellent preservative. But if the pole has been notched, drilled, or damaged at the base, treatment is breached and rot can start.
5. Age — even a perfectly-maintained CCA-treated pole has a 25–50 year lifespan depending on conditions.

Can you repair a rotten pole?

Short answer: rarely, and only for specific cases.

• Surface weathering and shallow cracks — can be sealed and maintained.
• Ground-line rot sleeves exist, but are only appropriate if the structural wood above the rot zone is sound and the rot is limited. A Level 2 electrician has to assess whether a sleeve is safe.
• Significant ground-line rot or heart rot — replace. Don't repair. A pole can hold up for years with 50% of its cross-section rotted, and then snap on the next windy day.

When to act urgently

Stop reading and call an electrician today if you see:

• Fungus or mushrooms growing from the pole
• Soft timber you can push a screwdriver into
• A visible hole through the base
• The pole is visibly leaning more than last year
• You've had a defect notice from Ausgrid or Endeavour Energy

Who inspects and replaces timber poles?

Only a licensed Level 2 electrician can legally work on or replace a private power pole in NSW. A good inspection takes 20–30 minutes. If a replacement is needed, we handle the pole, the service cable, the network paperwork, and cleanup.

If your pole is over 25 years old and hasn't been inspected in the last 3 years, it's worth getting checked.

Book a timber pole inspection →