Seven signs a tree on your Central Coast block is in trouble.
Trees almost never fail without warning. They fail without anyone reading the warning, which is a different thing. Most of what we see after an East Coast Low was visible from the kitchen window for two years. Here is what to look for, in the order it worries us, plus the two false alarms that send us out to perfectly healthy trees every month.
The seven signs, worst first
1. A lifted or cracked root plate. Walk to the base and look at the soil, not the trunk. If the ground on one side has heaved into a low mound, or has cracked and opened away from the trunk on the opposite side, that tree is already moving. This is the most urgent sign there is and it does not improve. Stop parking under it today, not after the weekend.
2. Included bark in a co-dominant union. Where a trunk splits into two competing stems, look into the fork. A sound union is a raised, rounded ridge of bark. A failing one is a tight vertical seam where the bark has grown inward between the two stems instead of the stems fusing. That seam is a crack with bark in it, and it is the single most common failure we cut off Coast roofs. Angophora and spotted gum both do this readily.
3. Bracket fungi at the trunk or root buttress. A visible bracket or conk is the fruiting body of a fungus that has been decaying wood inside the tree for years. The mushroom is the last stage, not the first.
4. A new lean. Not a lean - a new lean. More on that below, because it is where most people get it wrong in both directions.
5. Deadwood concentrated in the upper canopy. Scattered deadwood through a canopy is normal and healthy - trees shed what they cannot feed. Deadwood clustered at the top, with a thin, sparse crown while the lower canopy looks fine, points at a root problem. The tree cannot lift water to its highest points any more. Common on blocks where a driveway, pool or extension went in over the root zone a few years back, which is exactly what AS 4970 tree protection exists to prevent.
6. Bark falling away in sheets, out of season. Spotted gum and angophora shed bark - that is what they do, and every Coast owner knows the summer mess. What is not normal is bark peeling off outside that species’ normal shedding window, leaving dead, dry timber underneath rather than fresh smooth bark. That is a dying section, not a shedding one.
7. A hollow that sounds drummy. Knock the trunk with the heel of your hand or a mallet, low and around. A solid tree thuds. A hollow section rings drummy and hollow-sounding. Hollows are not automatically fatal - plenty of habitat trees stand for decades with them - but a drummy section under a heavy limb over your roof needs a look.
One sign means book an inspection. Two of these together on the same tree means stop parking under it and ring someone this week.
The lean that isn’t a problem
This is the most common false alarm we drive out to on the Coast, and we would rather tell you for free than charge you to hear it. Plenty of local trees have leaned for forty years and are completely sound. A coastal angophora at Copacabana, Killcare or MacMasters that grew away from the salt wind will lean hard and be perfectly stable, because it laid down reaction wood on the compression side the whole time it was growing and its root plate developed to match the load. That tree is not falling over. It is doing exactly what a coastal tree does.
What matters is whether the lean is new. A tree that leaned last summer and leans further this summer is failing. The test is the soil, not the trunk: cracked, mounded or opened soil on the high side means the root plate is lifting and the lean is progressive. Undisturbed soil, matching bark all round and an upper canopy that has straightened back toward the light is a settled, old lean. Photograph the base of any tree you are unsure about, with something for scale, and take the same shot in six months. That five-minute habit answers the question better than any amount of worrying.
The second false alarm is the fungus in the lawn. Toadstools in the grass near a tree are usually breaking down old mulch or buried timber and mean nothing about the tree. It is a bracket growing on the trunk or the buttress that matters.
Why the Coast is harder on trees than most of NSW
Three drivers stack here in a way they do not inland. First, the East Coast Low season and the summer southerly busters deliver the wind gusts that actually break trees. Second, those same systems saturate the soil, so root plate grip is at its worst precisely when the wind load is at its highest. A spotted gum on the sandy Woy Woy peninsula in a wet July is holding on to soup. Third, our dominant canopy species grow tall, heavy and fast: spotted gum, angophora and blackbutt all reach 20m plus on suburban blocks, and they hold their mass high.
Add the coastal salt-laden wind pruning canopies asymmetrically on beachside blocks from Terrigal to Norah Head, and the heavier clays inland at Lisarow and Wyong shrinking and swelling through every wet-dry cycle, and you get a tree population with more structural defects than the average. That is not a reason to remove trees. It is a reason to look at them.
Inspection cycle, cost, and a worked example
For a mature tree within falling distance of a house, driveway or where people gather, every two to three years is a sensible cycle, plus a walk-around after any significant storm. Trees with a known defect under monitoring, or trees over a high-use target like a pool or a bedroom, go annual. The post-storm walk-around costs nothing and catches most of what matters.
2026 costs, ex-GST. AQF Level 3 visual inspection with a written summary on one tree: $250 to $450. Whole block, several trees in one visit: $400 to $700. Full VTA-style assessment with a written report suitable for a Central Coast Council Private Tree Works application or an insurer: $300 to $550. A dead or clearly dangerous tree is exempt from the permit under Central Coast Council’s Tree & Vegetation DCP, but only where an arborist’s assessment says so in writing - which is the other reason the written report earns its money. Court-standard or development-related reporting is AQF Level 5 consulting work at $800 to $2,000 and we refer that to a local consulting arborist rather than pretend we do it. If the inspection leads to work with us, we credit the fee against the job.
Worked example, and a good outcome. Owner at Point Clare rang about a 22m spotted gum overhanging the back of the house, worried by a lean. Inspection $320. The lean was old and sound - undisturbed soil, good reaction wood, canopy corrected. But the tree had a tight included-bark union at 8m directly over the main bedroom, which she had never noticed. We did not remove the tree. We took the smaller of the two competing stems out to AS 4373, reducing the load on the union by about half, and put it on a two-year monitoring cycle: $1,450, inspection fee credited. She kept a 22m tree that would have cost $5,000 to remove and that a less honest quote would have condemned on the strength of the lean alone. If the answer had gone the other way, our removal versus lopping page covers how we would have made that call, and tree removal covers the work itself.
FAQs - warning signs, leans, fungi, inspection cycle, cost
What are the warning signs a tree is about to fail?
A lifted or cracked root plate (most urgent). A vertical crack or included bark in a co-dominant fork. Bracket fungi on the trunk or base. A new lean, or a lean with soil opening at the base. Deadwood concentrated in the upper canopy rather than scattered. Bark falling in sheets outside the normal shedding season. A hollow that sounds drummy. One sign means book an inspection; two together mean stop parking under it.
Is a leaning tree always dangerous?
No - the most common false alarm we attend. Coastal angophoras at Copacabana or Killcare lean hard away from the salt wind and are perfectly stable, because they built reaction wood and a matching root plate as they grew. What matters is whether the lean is new. Cracked or mounded soil on the high side means the root plate is lifting; undisturbed soil with a canopy corrected toward the light is a settled old lean.
Do bracket fungi mean the tree must come down?
Not automatically, but it is never nothing. The bracket is the fruiting body of decay that has been inside the tree for years. What decides it is where it is and how much sound wood remains - outer-shell decay on a big spotted gum can be monitored for years; decay at the root buttress or in a union over your roof cannot. That needs a sounding or a resistograph, not a photo and a guess.
How often should a mature tree be inspected?
Every two to three years within falling distance of a house or driveway, plus a walk-around after any significant East Coast Low. Annual for a known defect under monitoring or a tree over a pool or bedroom. Saturated soils reduce root grip exactly when the wind peaks here, which is why the Coast needs this more than inland NSW.
What does an inspection cost in 2026?
AQF Level 3 visual inspection with a written summary, one tree: $250 to $450. Whole block in one visit: $400 to $700. Full written assessment for a permit or insurer: $300 to $550. Court-standard or development reports are AQF Level 5 work at $800 to $2,000 and we refer those out. Inspection fee is credited against any work you book with us.
Seen one of the seven? Send a photo of the base and the fork.
Two photos tell us most of it: the soil at the base of the trunk, and up into any fork where the trunk divides. We will tell you honestly whether it needs an inspection, whether it needs work, or whether it is a forty-year lean that is going to outlive all of us. AQF Level 3 arborists, fully insured, across the full Central Coast from Killcare and Umina through Gosford and Erina to Wyong and the Lake Macquarie boundary.