Where the suburb stops and the bush starts
Hornsby is the point on the North Shore where suburbia runs directly into national park. Berowra Valley wraps around the western and northern edges, Lane Cove National Park sits to the south, and a large number of blocks through Hornsby Heights, Mount Colah, Waitara and Normanhurst back straight onto reserve.
That produces a specific kind of tree job. The house sits on the ridge, the block falls steeply behind it, and the trees that matter are down the slope on sandstone with no vehicle access at all.
The ground and the trees
This is Hawkesbury sandstone country: thin, sandy, acidic soil over rock shelves. The forest is dry sclerophyll — Sydney peppermint, red bloodwood, scribbly gum, angophora and blackbutt, with a heath understorey. On the better shale-influenced pockets around Normanhurst and Waitara you get taller blackbutt and turpentine.
Angophora is the species that generates the most calls. It grows into beautiful contorted shapes over sandstone, drops substantial limbs without warning in hot still weather, and is frequently protected. Sydney peppermint sheds bark and small deadwood constantly and is usually a deadwooding job rather than a removal.
Bushfire, and what it does and does not allow
Large parts of the Hornsby fringe are mapped bushfire-prone, and owners regularly assume that entitles them to clear. It does not, on its own. The 10/50 entitlement area was reduced in 2015 and much of the shire now sits outside it. Where a bushfire management plan or an asset protection zone applies to your property, there is a legitimate pathway, but it is a documented one.
Fuel reduction that is genuinely useful — clearing accumulated deadwood, removing ladder fuels close to the house, cutting back growth touching the roof — is generally achievable within the rules. Removing a healthy mature tree fifty metres down the gully usually is not.
Access and method
Hornsby jobs are climbing jobs. A climber works the tree, sections are lowered on rope onto whatever flat ground exists, and the timber is then moved uphill by hand or winch to the chipper on the street. Stump grinding on these blocks frequently meets rock within 200mm, which limits how deep the grind can go — we will tell you that up front instead of discovering it with your money.
Ausgrid lines run through several of the older streets, and anything growing toward a conductor is reported to Ausgrid rather than cut privately.
Ring (02) 9090 4915. Nearby: St Ives, Pymble and Gordon. See also emergency tree work for storm callouts.
Frequently asked questions
Does bushfire-prone land let me clear trees without approval?
Not automatically. The 10/50 vegetation clearing entitlement was cut back sharply in 2015 and much of the Hornsby area now falls outside the entitlement zone, so check the Rural Fire Service online tool for your exact address before cutting anything. Asset protection zone work under a bushfire management plan is a separate pathway with its own requirements.
Can you work on a block that falls away into the gully?
Yes, and most Hornsby Heights and Mount Colah jobs are exactly that. Where the tree is below the house with only a path or steps to it, the work is climbed and the timber is carried or winched out by hand. It is slower than a driveway job and the quote says so plainly rather than surprising you on the day.
What is the situation with trees in a bushland reserve behind my fence?
They are council or National Parks land and nobody may touch them without permission — including limbs overhanging your boundary in most cases. Hornsby Shire takes encroachment into reserves seriously. If a reserve tree genuinely threatens your house, report it to council with photographs and let them assess it.