How to Remove a Dead Branch from a Tall Tree

Removing a dead branch from a tall tree is a job that ranges from a straightforward DIY task to a serious technical operation — it all depends on the size of the branch, how high up it is, and what's underneath it. For small branches you can reach safely from the ground or a stable ladder, a careful homeowner can handle the work. For anything higher than about 3–4 metres, or branches over roughly 50 mm in diameter, it's strongly worth considering a qualified arborist.

Why Remove Dead Branches?

Dead branches (sometimes called "deadwood") are a genuine hazard. They can fall without warning, especially in wind or rain — a common occurrence across New Zealand's varied climate. Beyond safety, removing deadwood helps the tree stay healthy by reducing the risk of fungal disease and pest entry through decaying wood.

Assess the Job First

Before you pick up a saw, take a good look at the branch:

• How high is it? If you need more than a 3-step ladder to reach it, the risk increases significantly.
• How large is it? Branches over about 50 mm diameter can be surprisingly heavy and unpredictable when they fall.
• What's below? Power lines, structures, fences, or people nearby change the risk profile entirely.
• Is the tree itself healthy? A stressed or rotten trunk can be unstable to climb or work around.
• Are there power lines nearby? Under the Electricity Act, working within 4 metres of overhead lines is restricted — stop and call a professional.

If anything gives you pause, trust that instinct and call a professional arborist. You can find qualified local arborists on tradedirectory.co.nz.

Tools You'll Need

For a manageable branch you can safely reach:

• Pruning saw – a folding or fixed-blade hand saw designed for green and dead wood
• Loppers – for smaller branches up to about 30 mm
• Pole pruner – extends your reach from the ground for branches up to 4–5 metres high
• Safety glasses and gloves – always
• Hard hat – recommended whenever there's any risk of falling material
• Stable ladder – if needed, with someone footing it

Avoid using a chainsaw on a ladder — this is extremely dangerous and not recommended for homeowners.

The Three-Cut Method

For any branch thicker than about 25 mm, use the three-cut method to prevent the bark from tearing back down the trunk, which can cause lasting damage to the tree:

1. Undercut first – About 30–40 cm out from the trunk, cut upward about one-third of the way through the branch. This prevents the bark from stripping when the branch falls.
2. Top cut – A few centimetres further out from the undercut, cut downward all the way through. The branch will drop cleanly.
3. Final cut – Remove the remaining stub by cutting just outside the branch collar (the slightly swollen ring of tissue where the branch meets the trunk). Do not cut flush with the trunk — the collar is where the tree heals itself.

What Is the Branch Collar?

The branch collar contains specialised cells that grow over the wound. Cutting into it slows healing and invites disease. Leave it intact and the tree will seal the wound naturally over time — no pruning paste or wound sealant is needed or recommended by modern arboricultural practice.

Working Safely at Height

Height is where most serious injuries happen. WorkSafe NZ considers falls from height one of the leading causes of serious harm in New Zealand. Keep these points in mind:

• Never overreach from a ladder — move the ladder instead
• Have a second person present whenever you're working above ground
• Never work near power lines — contact your lines company first
• Wear a hard hat and safety glasses at all times
• Clear the drop zone of people and pets before making any cut

Do You Need a Building Consent or Council Permission?

In most cases, removing a dead branch does not require a building consent. However, some trees in New Zealand are protected by a Notable Tree schedule in a district plan, or may be subject to a resource consent condition. Check with your local council before removing any significant amount of material from a large or old tree, particularly in heritage areas or if the tree is on a boundary. MBIE Building Performance has general guidance on what work requires consent.

When to Call a Professional

Call a qualified arborist if:

• The branch is more than 3–4 metres off the ground
• The branch is large (over 50 mm diameter) or heavy
• The tree is near power lines or structures
• You're unsure about the health or stability of the tree
• The tree is protected under your district plan
• You don't have the right equipment or a helper

A professional arborist will have the training, equipment (including ropes, harnesses, and sometimes elevated work platforms), and insurance to do the job safely. For guidance on tree health and best practice, BRANZ and industry bodies publish useful resources. You can find experienced, local arborists through tradedirectory.co.nz.

Sources & Further Reading

• WorkSafe NZ – Working at Height
• MBIE Building Performance – Building Consent Information
• BRANZ – Building and Construction Research
• Standards NZ – NZ Standards