A hazardous tree is one with a defect you can see and a target underneath it. Both halves matter. A hollow cedar elm in the middle of a ten-acre field is not a hazard, it is wildlife habitat. The same tree eight feet from a bedroom wall is a different conversation entirely.
If you are reading this because something about a tree has been bothering you for months, that instinct is usually right. Send a photo of the base and the whole tree and we will give you a straight answer.
The defects that actually matter
A lean that changed. Trees grow at angles all the time and a tree that has leaned the same way for thirty years is usually fine. A tree that has moved this year is not. The tell is soil: cracked or heaved ground on the opposite side from the lean means the root plate is lifting.
Included bark. Where two leaders grow up tightly against each other, bark gets trapped in the join instead of wood. There is nothing holding those two stems together but habit. Bradford pear does this famously, and so do a lot of multi-stem live oaks in Austin front yards.
Decay at the base. Shelf fungus growing out of the root flare means the fungus has already eaten a lot more than you can see. A screwdriver that pushes into the trunk without much effort is telling you the same thing.
Cavities. A hollow trunk is not automatically doomed, because trees carry load in the outer wood. Rough rule: once the solid shell is less than about a third of the trunk radius, the safety margin is gone.
Deadwood over a target. Big dry limbs above a driveway or patio come down eventually. Sometimes that can be fixed with pruning rather than removal.
What it costs
Hazardous trees run 20 to 40 percent above a straightforward removal of the same size, so $900 to $3,200 for most Austin residential jobs. The premium is not opportunism. A compromised tree cannot be climbed, which means a bucket truck or a crane. Rigging points have to be tested rather than assumed. And the pieces have to come down in smaller sections, because a defective trunk will not take the shock loading a sound one shrugs off.
Where a crane is the safe answer, expect $3,500 and up, and see crane-assisted large tree removal.
Austin ground makes this worse
Two local conditions turn marginal trees into failures. East of I-35 the Blackland Prairie clay swells and shrinks through every drought and flood cycle, and that constant movement shears fine roots and opens gaps around the root plate. West of I-35 there is often only a foot or two of soil over solid limestone, so a big live oak may be anchored in far less than its canopy suggests.
Then the pattern that catches people: a long drought kills roots quietly, the tree looks fine for two more years, and the first genuinely wet, windy night it goes over. A lot of the trees we take down after Austin storms were dying underground well before the weather got the blame.
Permits for a hazardous tree
Austin protects trees from 19 inches in diameter, and Heritage trees at 24 inches and above are harder still. Genuine hazard is one of the accepted grounds for removing a protected tree, but you have to show it rather than assert it. That means documentation before the saw comes out: photographs of the defect, the measurement, and a written assessment. We put that together as part of the quote. Cutting first and applying afterwards is how people end up with fines running into thousands. Full detail in the Austin permit guide.
Questions about hazardous trees
How do I know if a tree is dangerous?
Look at the bottom three feet first. Heaved or cracked soil on one side, shelf fungus at the root flare, a cavity you can push a screwdriver into, or bark falling away in sheets are the four signs that matter most. Then look up for a split where two leaders meet. Any of those plus a house underneath is worth a call.
My neighbour’s tree leans over my house. What can I do?
In Texas you may trim anything crossing your property line, at your own cost, as long as you do not kill the tree. To shift liability if it falls, tell your neighbour in writing that the tree is hazardous and keep a copy. A documented warning they ignored is what turns their insurance claim into a negligence question.
Can a leaning tree be saved with cables?
Sometimes. Cabling or bracing can hold a split union together on a tree that is otherwise healthy and worth keeping, which on a mature Austin live oak is often worth the money. It does nothing for root failure or trunk decay. Cables also need inspecting every few years, so it is a commitment rather than a fix.
Is a hollow tree always dangerous?
No. Trees carry load in the outer rings, so a hollow trunk with a thick sound shell can stand for decades. The working rule is that once the solid wood is thinner than about a third of the trunk radius, the margin has gone. Cavity plus a lean, or cavity plus fungus, is a worse combination than either alone.
How quickly should a hazardous tree come down?
If the soil is moving, treat it as an emergency and keep people out from under it tonight. Everything else can usually be scheduled within a week or two. Try to get it done before the spring storm season rather than during it, when every crew in Austin is already booked.
Where we take down hazardous trees
Austin, Round Rock, Cedar Park, Georgetown, Pflugerville, Leander, Hutto, Lakeway, Kyle and Buda.