Trimming A Neighbor’s Tree Hanging Over Your Yard: Legal Or Not?

Here's how a real-life scenario made me curious about who's right and who's wrong.

I witnessed a pretty heated argument in my neighborhood recently between two guys over a tree. One neighbor was trimming branches that had grown over his property, while the other neighbor apparently wasn't thrilled about it. At one point, somebody threatened to call the police.

Which got me wondering who is actually right? Is it legal to trim your neighbor's tree if the branches are hanging over your yard or even over your house? Or, are you just a vandal at that point?

In Illinois, the answer is generally yes, but there are some pretty important rules you've got to follow.

person in black jacket and gray pants holding orange snow shovel

You Should Always Try To Talk To Your Neighbor Before Your Chain Saw Is Fired Up

Illinois Legal Aid Online says that if a tree's trunk is entirely on your neighbor's property, you generally have the right to trim branches that extend over your property, all the way back to your property line. You don't necessarily need your neighbor's permission.

However, the catch is that you can't simply hack away at the tree however you want.

You can't cross the property line to do the work, and you shouldn't trim so aggressively that you seriously damage or kill the tree. That's where a seemingly innocent Saturday afternoon with a chainsaw could become a very expensive disagreement.

It's a different story if the tree's trunk is on the property line. Illinois generally considers a boundary-line tree to be jointly owned by both property owners. In that situation, one neighbor can't simply decide to remove the tree without the other's agreement.

man in black jacket holding orange and white snow blower

There Is One More Wrinkle To This Explanation

Illinois doesn't have one universal set of rules covering every tree in every community.

Municipalities can have their own ordinances concerning trees, particularly trees that are diseased, dangerous, protected, or affecting public property. Illinois law specifically gives municipalities authority to establish rules concerning the removal of nuisance greenery, including trees.

So, if your neighbor's tree is invading your airspace, you're generally allowed to trim the portion that's on your side (at your own expense) provided you stay on your side of the line and don't endanger the tree.

And maybe, before firing up the chainsaw, talk to your neighbor. While Illinois law may give you the right to trim the branch, it doesn't say anything about the neighborhood feud that may come with it.