Short of that, “emergency tree work” means something more specific than urgent. Sydney councils exempt trees posing an imminent risk to life or property from the usual permit process, but almost every council wording requires Council to be satisfied of that first, and requires evidence. Understanding where that line sits is the difference between a lawful removal and a penalty notice on a tree you were right to be worried about.
The three situations, in order
1. Immediate danger: call emergency services
A tree or limb resting on a dwelling, across a carriageway, blocking an exit, or in contact with electrical conductors is not a quote request. Call 000 for fire, injury or an immediate threat to life, or the NSW State Emergency Service on 132 500 for storm and flood damage, including trees down on homes.
For anything involving powerlines, contact the network operator. A downed conductor may still be live and the ground around it can be energised, which is covered in more detail in our guide to trees and powerlines in Sydney.
Keep people, children and animals away from the tree and from anything it is touching. Do not try to stabilise it, prop it or cut anything off it.
2. Imminent risk: the council exemption pathway
This is where a tree has a defect serious enough that failure is reasonably expected, but nothing has happened yet. It is the category the council exemptions are written for, and the category that needs documenting.
3. Urgent but not exempt: a fast-tracked application
A tree that is declining, structurally poor, or worrying you is often neither an emergency nor exempt. The honest answer in many cases is that it needs an assessment and a permit application, prepared properly so it is not refused.
What councils actually mean by imminent risk
The wording differs, but the pattern across Sydney is consistent, and it is worth seeing the differences side by side.
| Council | How the exemption is framed |
|---|---|
| Ku-ring-gai | Removal of a tree that is structurally unsound or unstable and displays a high degree of hazard, provided Council has advised it is satisfied the tree poses an imminent risk to human life or property. An arborist’s report and testing may be required for significant trees |
| Hornsby Shire | Trees deemed by Council in writing, and shown by recorded photographic evidence or written evidence provided by an AQF Level 5 arborist, as an imminent risk to human life or likely to cause substantial damage to property in the near future |
| The Hills Shire | Trees Council is satisfied are dead, dying or dangerous, with evidence required to demonstrate the exemption criteria apply |
Three things come out of that comparison.
Council’s satisfaction is part of the exemption, not a formality afterwards. In each case the exemption is conditional on Council having been told and having accepted the position. It is not a provision that lets you act first and explain later.
Evidence is specified. Hornsby names photographic evidence and evidence from a Level 5 arborist. Ku-ring-gai contemplates a report and testing for significant trees. The Hills requires evidence demonstrating the criteria apply.
The test is about the near future, not the eventual future. Every tree will fail eventually. The exemptions are about defects where failure is reasonably expected soon, with a target underneath.
Our guide to council approval for tree removal in Sydney covers how the broader approval system works, and the council-specific guides for Ku-ring-gai, Hornsby and The Hills Shire set out each one in detail.
What makes a tree an imminent risk?
Risk in arboriculture is not just about whether a tree might fail. It is the combination of three things, and all three have to be present.
The likelihood of failure. How probable is it that the part in question comes down, given its condition?
The likelihood of impacting a target. If it fails, does it hit anything? A large limb over an unused back corner of a paddock is a different proposition to the same limb over a bedroom.
The consequences. What happens when it hits? A branch onto a lawn and a branch onto a children’s trampoline are the same failure with different outcomes.
This is why “that tree is huge and it scares me” does not succeed as an application, and why a modest-looking tree over a driveway sometimes does. Councils assess risk, not size.
Formal methodologies exist for this, including Tree Risk Assessment Qualification and Quantified Tree Risk Assessment. Hornsby Shire names both in its development control plan and requires an application for removal to demonstrate its case using an industry-relevant risk assessment method.
Defects that commonly support an imminent risk case
These are the features an arborist looks for. Seeing one does not mean a tree is dangerous, and not seeing one does not mean it is safe, which is exactly why assessment is a trained job.
- A failed or failing union. Included bark at a major fork, where bark is trapped between two stems instead of wood binding them, is one of the more common failure points in large Sydney trees.
- Fresh cracks. Longitudinal cracks in a trunk or major limb, particularly where they have opened recently.
- A limb that has moved. A branch sitting noticeably lower than it was, or that has shifted after a storm.
- Hanging or detached limbs caught in the canopy. These are the widowmakers, and they are a reason for prompt action regardless of species or season.
- Root plate movement. Soil lifting, cracking or heaving on one side of the base, or a lean that has changed. A new lean is far more significant than an old one.
- Fungal fruiting bodies at the base or on the trunk. Brackets and conks can indicate internal decay. Identification matters, because some species are aggressive and others are not.
- Significant cavities and decay. The question is not whether there is a hollow but how much sound wood remains around it.
- Severe dieback. Extensive deadwood in the upper canopy, bark falling away in sheets, or a canopy that failed to flush in spring.
- Recent disturbance in the root zone. Trenching, excavation, soil level changes or heavy compaction near a large tree can destabilise it long before the canopy shows anything.
A note on the last two. Deadwood is dealt with in the post on dead wood in trees from an earlier batch, and root zone disturbance is often what turns a sound tree into a hazard, which is why councils regulate works near protected trees.
What to do when you think a tree is an imminent risk
Move the target, not the tree. This is the single most useful immediate action and it is almost always available. Park the car elsewhere. Move the trampoline, the outdoor setting, the play equipment. Close off the path. Sleep in a different room if a limb sits over a bedroom. Risk is likelihood multiplied by consequence, and you can remove the consequence in ten minutes without touching the tree.
Photograph it now. Wide shots showing the tree, its setting and what is beneath it, plus close-ups of the defect. Photographs taken before any work are the evidence councils ask for and they are impossible to recreate afterwards. Include something for scale.
Get it assessed. A qualified arborist will identify the species, examine the defect, assess the risk properly and tell you which of the three categories you are actually in.
Contact Council. Where the exemption pathway applies, Council needs to be told and needs to express its satisfaction before work proceeds. The assessment and the photographs are what make that conversation short.
Do not approach it, and do not touch it. Not to prop it, not to tie it back, not to cut the branch that seems to be holding it. A tree under tension is unpredictable, and a limb caught in a canopy can release without warning.
After a storm
Storm season in Sydney builds through spring into summer, and it produces a particular pattern: a lot of damage at once, a lot of operators arriving at once, and a lot of pressure to decide quickly.
A few things worth knowing.
Not everything that looks bad is urgent. A tree with a lot of foliage stripped and small branches down may be structurally untouched. A tree that looks largely intact may have a cracked union you cannot see from the ground.
Torn branches need a proper cut. A limb ripped from a trunk leaves a ragged wound with bark stripped below the break. Cleaning that back to a correct cut is worth doing promptly, and it is not the same job as cutting the hanging piece off.
The clean-up and the assessment are different jobs. Getting the fallen material away is urgent. Deciding the fate of the standing tree is not, and it is better done after the ground has dried out and the tree has been properly looked at.
Be careful who you engage in the week after a storm. Itinerant operators follow storm damage, and the pressure to accept a fast offer is highest exactly when a tree has just failed. Our FAQ on choosing an arborist in Sydney sets out what to check, and it takes less time than most people assume.
Document everything for insurance. Photographs before anything is moved, the arborist’s assessment, and the written quote. Insurers ask for all three.
Who should you call, and in what order?
A short decision list, because the order matters more than people realise when a tree has just failed.
- Anyone in danger, fire, or injury goes to 000 first, before anything else.
- Powerlines involved in any way goes to the network operator. Do not wait to see whether the line is live.
- A tree on a house, or storm damage affecting a building goes to the NSW State Emergency Service on 132 500, which is the agency for that work.
- Blocking a public road goes to emergency services or the council, depending on the road.
- A council tree, on a nature strip or in a reserve, goes to the council as a service request, regardless of where it has landed.
- Everything else on private property goes to an arborist for assessment, and to your insurer before any work beyond make-safe is authorised.
The common error is calling a tree company first for something in the first three categories. It delays the response and puts a crew in front of a hazard that is not theirs to manage.
What does emergency tree work actually involve?
Worth knowing, because it explains why the quote on an urgent job can differ sharply from a routine one.
Making the site safe comes first. Before anything is cut, the crew establishes exclusion zones, identifies what is under load, and works out what is holding what. A damaged tree is a structure that has partly failed, and the order in which pieces come off determines whether the rest of it behaves predictably.
Rigging rather than felling. Very little urgent work in suburban Sydney is a straight fell. Sections are cut and lowered on ropes, because the drop zone is usually a roof, a fence, a pool or a neighbour’s garden. That takes longer and needs more people than taking a tree down in open ground.
Damaged wood behaves differently. Timber under tension and compression from a partial failure moves when it is released. Cuts are planned so the piece goes where it is meant to, and that planning is most of the skill.
Access often dictates the method. Whether a truck, chipper or elevated work platform can get near the tree changes the job entirely. Where it cannot, material is carried out by hand, which is where the hours go.
Make-safe and full removal are separate decisions. On an urgent job the first visit frequently removes the immediate hazard and nothing else. That gets the risk down quickly, lets the insurer see the site, and leaves the decision about the standing tree to be made properly rather than at seven in the morning in the rain.
Asking for the work to be quoted in those two stages is reasonable and often cheaper than authorising a full removal on the spot.
Does an emergency remove the need for approval?
It removes the need for a permit application, where the exemption applies and Council has been satisfied. It does not remove the need to deal with Council at all.
It also does not override the other layers. Heritage listings, biodiversity mapping, threatened ecological communities and conditions of development consent can all continue to apply, and in several councils the exemptions are expressly stated not to apply on heritage land. A dangerous tree on a heritage item is a conversation with Council, not a unilateral decision.
Where a tree is genuinely an immediate danger to life, the emergency services pathway operates on its own terms and the regulatory tidying up follows.
What an assessment gives you
Most calls about dangerous trees end in one of three outcomes, and two of them cost less than the caller expected.
The tree is sound and the concern is not supported, in which case nothing is spent on removal. The tree has a defect that can be managed by removing a specific limb, reducing a specific stem or installing support, in which case the tree stays. Or the tree genuinely needs to come out, in which case you have the documentation to do it lawfully and the evidence if it is ever questioned.
Sydney Tree Company provides tree removal, tree surgery, tree health inspection and evaluation, and arborist advice across the Sydney metropolitan area and regional Sydney, assists with council tree preservation paperwork, and works across the areas we serve.
Call 0431 732 265 to arrange an assessment.