Topping a tall tree yourself is generally not recommended — it's physically dangerous, can seriously damage or kill the tree, and may even require a building consent or council approval depending on where you live. For most tall trees, the safest and smartest option is to hire a qualified arborist. That said, there are some smaller tasks a capable homeowner can tackle, and it helps to understand the full picture before you pick up a chainsaw.
What Is Tree Topping — and Why Is It Controversial?
Tree topping means cutting back the main trunk or large upper branches to reduce a tree's overall height. While it sounds straightforward, topping is widely regarded by arborists as poor practice. Here's why:
- It creates large, open wounds that are slow to seal and highly vulnerable to rot, fungal disease, and pest attack.
- It triggers rapid, weakly attached regrowth (called epicormic shoots) that can become a bigger hazard than the original tree.
- It often shortens the tree's lifespan significantly.
- A topped tree can look unsightly and lose its natural form permanently.
If your goal is to reduce height or manage risk, a qualified arborist will usually recommend crown reduction or selective pruning instead — techniques that achieve a similar result while keeping the tree healthy and structurally sound.
The Real Safety Risks of DIY Tree Work
Working at height in a tree is one of the most hazardous DIY tasks a homeowner can attempt. Key risks include:
- Falling from height — even a fall from a few metres can be fatal.
- Struck-by hazards — large branches are unpredictable when cut and can swing, bounce, or fall in unexpected directions.
- Chainsaw injuries — chainsaws cause serious lacerations and kickback injuries every year in NZ. WorkSafe NZ has clear guidance on chainsaw safety.
- Power line contact — never work near overhead lines. This is an absolute no-go for DIYers.
- Unstable footing — ladders in trees are inherently unsafe for heavy cutting work.
Professional arborists use specialised climbing gear, rigging equipment, and personal protective equipment (PPE) that most homeowners simply don't have access to.
Do You Need Council Permission?
Before you cut anything, check with your local council. Many councils across NZ have tree protection rules in their district plans — particularly for large, mature, or heritage trees. Cutting or topping a protected tree without consent can result in significant fines.
Even if a tree isn't specifically listed, rules around vegetation removal vary widely by district. Some councils require a resource consent for removing or significantly altering trees above a certain trunk diameter or height. Always confirm with your council before starting work.
For general guidance on what work requires building consent versus what falls under Schedule 1 exemptions, visit MBIE Building Performance — though tree work is primarily a resource consent matter governed by the Resource Management Act, not the Building Act.
What Can a Homeowner Safely Do?
There are some lower-risk pruning tasks that a competent homeowner can reasonably tackle:
- Removing small branches (generally under about 50 mm diameter) from ground level or a stable, low ladder.
- Pruning shrubs and small ornamental trees that are well within reach without climbing.
- Clearing deadwood from the lower canopy if it can be done safely from the ground.
What You Should NOT Attempt Yourself
- Any work that requires climbing the tree or working above about 3 metres.
- Cutting branches near power lines (contact your lines company — this is their responsibility).
- Removing large limbs or the main leader (top trunk) of a tall tree.
- Using a chainsaw on a ladder.
- Any work on trees close to structures, fences, or neighbouring properties where a falling branch could cause damage.
Better Alternatives to Topping
If your tree has genuinely outgrown its space or is causing a hazard, discuss these options with a qualified arborist:
| Option | What It Involves | Tree Health Impact |
|---|---|---|
| Crown reduction | Selectively shortening branches back to natural growth points | Low, if done correctly |
| Crown thinning | Removing selected branches to reduce density | Low |
| Pollarding | Managed, repeated cutting at set points (suits certain species) | Moderate — species-dependent |
| Full removal | Removing the tree entirely | N/A |
A good arborist will assess the species, age, and condition of your tree and recommend the most appropriate approach.
When to Call a Professional
You should always hire a qualified arborist when:
- The tree is tall enough to require climbing or aerial work.
- The tree is near power lines, structures, or boundaries.
- You're unsure whether the tree is protected under your council's district plan.
- The tree appears diseased, structurally compromised, or has already been previously topped.
- You want the work done in a way that keeps the tree healthy long-term.
Look for an arborist with a NZ Certificate in Arboriculture or equivalent, and ideally membership with the New Zealand Arboricultural Association (NZAA). You can find qualified local arborists on tradedirectory.co.nz.
For rental properties, landlords should also be aware of obligations under the Healthy Homes standards if tree work affects drainage, ventilation, or access.
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