The 10/50 rule is the most misunderstood piece of bushfire regulation in New South Wales. We get asked about it constantly, and the version people have in their heads is almost always wrong in the same two ways.
So here is what it actually says, and then what the Illawarra escarpment does to it.
What 10/50 actually permits
The NSW 10/50 Vegetation Clearing Code of Practice lets eligible landowners clear certain vegetation around a home without seeking approval. The two numbers are not interchangeable:
- Trees within 10 metres of an external wall of a home.
- Underlying vegetation, such as shrubs, within 50 metres of that same home.
Misunderstanding number one is thinking you can clear trees to 50 metres. You cannot. Ten metres for trees, fifty for the shrub layer underneath.
Misunderstanding number two is thinking it applies everywhere. It does not. It applies only if your parcel of land sits inside a mapped 10/50 vegetation clearing entitlement area. You check that on the NSW Rural Fire Service online tool, by address. Entitlement areas can and do change, which is why the right time to check is the day the work is planned, not six months before.
The conditions people miss
Even inside an entitlement area, the code carries real limits:
- A "tree" is a perennial woody plant 3 metres or more tall with a trunk circumference over 30cm at 1.3 metres above ground. Smaller than that and it is not a tree for these purposes.
- You cannot clear trees on slopes greater than 18 degrees except in accordance with a geotechnical engineer's assessment report.
- No clearing within 10 metres of a lake or river 2 metres or more wide.
- Nothing where there is Aboriginal or heritage significance, wetland, critical habitat or a critically endangered ecological community.
- No methods that disturb the soil profile. No graders, ploughs or dozers.
- It does not override conditions in your development consent.
- You must be the landowner or have the landowner's approval.
Why the escarpment changes the answer
That 18 degree slope limit is the one that matters most around here, and it is the one nobody mentions. Eighteen degrees is roughly a 1 in 3 grade. A very large number of blocks at Mount Keira, Mount Kembla, Keiraville, Austinmer, Otford, Stanwell Park, Cordeaux Heights and the western edges of Figtree and Albion Park exceed it.
On those properties, 10/50 does not give you a free pass to take trees out. It gives you a pathway that requires a geotechnical assessment first, because removing trees from a steep slope changes how that slope behaves in heavy rain, and the Illawarra gets a great deal of heavy rain.
That is not an argument for doing nothing. It is an argument for doing it through the right pathway, which is usually a council application supported by an arborist report.
10/50 is not the same as an APZ
This is the distinction that matters most. The 10/50 code is a clearing entitlement. An asset protection zone is a managed condition.
An APZ is a strip of land between bushland and a building kept at a fuel load low enough that a fire arriving through it drops out of the canopy and becomes survivable. That means canopy separated so fire cannot run tree to tree, no vegetation touching the building, understorey thinned, and ground fuel removed rather than raked into a pile at the back fence.
You can use a 10/50 entitlement as one tool to help establish an APZ. But clearing to the 10/50 limits does not automatically give you a compliant APZ, and having an APZ does not require you to be in a 10/50 area. They are different instruments answering different questions.
The part everyone skips
An APZ is a condition, not an event. Clear it once and walk away and within three or four Illawarra summers the shrub layer is back and the ground fuel has rebuilt. The properties that are genuinely defendable are the ones on an annual cycle, usually done heading into spring, where each year is a trim because it never gets away.
The first visit is the expensive one. Every one after that is a fraction of it. That is the single best piece of bushfire advice we can give anyone with bush at the back fence.
What to do next
Check your address on the RFS 10/50 tool. Look honestly at your slope. Then work out whether what you need is a clearing entitlement, a council application, or an ongoing APZ program, because they are three different things and doing the wrong one is how people end up in trouble.
Or get us out and we will do that assessment with you. We check the tool and the slope before anything gets cut, every time.
Want an arborist to actually look at it?
Free assessment across the Illawarra. Honest answer about whether it needs doing, and a fixed price if it does.