Can I Use a Reciprocating Saw to Cut Thick Tree Branches Myself?

A reciprocating saw can handle light to moderate pruning jobs around the home, but it's not always the right tool for thick tree branches — and using it incorrectly can be genuinely dangerous. Understanding its limitations, choosing the right blade, and knowing when a job is beyond DIY will save you time, money, and a trip to A&E.

What a Reciprocating Saw Is Good For

A reciprocating saw (sometimes called a recip saw or by the brand name Sawzall) works by driving a blade back and forth at high speed. For tree work, it's most useful for:

• Cutting deadwood and small branches up to roughly 75–100 mm in diameter
• Trimming shrubs and hedges with woody stems
• Cutting fallen branches that are already on the ground and stable
• Removing root suckers and unwanted regrowth
• Getting into tight spaces where a chainsaw won't fit

For these lighter tasks, a reciprocating saw with the right blade is a perfectly reasonable DIY tool.

Where It Struggles: Thick Live Branches

Once you're dealing with live branches over 100 mm in diameter, a reciprocating saw starts to show its weaknesses:

• Blade flex and wandering — long blades deflect under load, making cuts uneven and unpredictable
• Blade pinching — a heavy branch can shift and clamp the blade mid-cut, causing the saw to kick back toward you
• Slow cutting — thick green wood is tough; a recip saw will labour and overheat
• Fatigue — holding a vibrating saw overhead or at arm's length for extended periods is tiring and increases the risk of losing control
• Poor finish — ragged cuts heal slowly and invite disease and fungal infection into the tree

For branches over roughly 100–150 mm, a pruning saw, pole saw, or chainsaw is a more appropriate tool — and for anything large or high up, a qualified arborist is the right call.

Choosing the Right Blade

If you do use a reciprocating saw for appropriate branch work, blade selection matters enormously:

Look for blades labelled specifically for green wood or pruning — these have aggressive, widely spaced teeth designed to clear sawdust and sap. Brands like Milwaukee, Bosch, and Makita (all widely available at Bunnings and Mitre 10) make suitable options. Use the shortest blade that will complete the cut to minimise flex.

Safe DIY Technique

If you're confident the job is within DIY scope, follow these steps:

1. Assess the branch — Is it dead or alive? How thick? Where will it fall? Is it under tension?
2. Use the three-cut method for branches over about 50 mm: undercut first (about one-third through from below), then cut from above slightly further out, then make the final flush cut at the collar
3. Secure yourself — never use a reciprocating saw while balanced on a ladder if you can avoid it; the kickback can throw you off balance
4. Wear PPE — safety glasses, cut-resistant gloves, sturdy boots, and a hard hat if there's any risk of falling material
5. Watch for tension — branches under load can spring unpredictably when cut; if you're unsure which way a branch will move, stop and get advice
6. Keep bystanders clear — establish a drop zone and keep children and pets well away

WorkSafe NZ has general guidance on safe use of power tools that's worth reviewing before you start.

Tree Work and NZ Regulations

Before cutting any tree, check whether it's protected. In New Zealand, many councils have District Plan rules protecting significant trees, street trees, or trees within certain zones. Removing or heavily pruning a protected tree without consent can result in significant fines. Always check with your local council before doing more than minor pruning.

If a tree is near power lines, do not attempt any work yourself — contact your lines company. This is non-negotiable for safety reasons, and working near live conductors is restricted work.

BRANZ and MBIE Building Performance can provide context on building-related tree clearance requirements if branches are close to structures.

When to Call a Professional

Call a qualified arborist when:

• The branch is over 100–150 mm in diameter
• The tree or branch is near power lines, fences, or structures
• You need to work at height (anything beyond a stable, ground-level step is risky with a power saw)
• The tree is leaning, damaged, or diseased and behaviour is unpredictable
• The branch is under significant tension (e.g., bent or wedged)
• The tree may be protected under your council's District Plan
• You're simply not confident — there's no shame in that

A qualified arborist has the training, equipment, and insurance to handle complex tree work safely. You can find experienced local arborists on tradedirectory.co.nz to get quotes and compare professionals in your area.

Sources & Further Reading

• WorkSafe NZ — Power tool safety
• BRANZ — Building and construction guidance
• MBIE Building Performance — NZ Building Code
• Bunnings NZ — Pruning blades and tools
• Mitre 10 NZ — Garden and outdoor tools
• Consumer NZ — Hiring tradespeople