The morning after a big blow is when most mistakes get made. The wind has dropped, the rain has eased to drizzle, and there is a strong urge to get outside with a saw and start tidying. A section with a tree across the lawn and brown water sitting against the house looks like a job to finish by lunchtime. In practice, the first few hours are better spent looking, photographing and making things safe than cutting anything.
Ex-tropical cyclones and slow-moving lows have left households from Whangārei to the Bay of Plenty dealing with fallen timber and floodwater at once. The order you tackle them in matters.
Start with power, water and people
Before thinking about the tree, walk the boundary of the problem. Look up as well as down. A trunk resting on a fence is rarely the real hazard; a branch hung up in the canopy above the driveway, or a line pulled tight by a leaning limb, is far more likely to hurt someone.
- Treat every downed or sagging line as live. Keep at least a few metres clear and report it to the lines company, not the electricity retailer.
- If water has reached power points, the switchboard or a hot water cylinder, leave the mains off until an electrician has checked it.
- Keep children and dogs inside. Floodwater on a section often carries sewage from overflowing gully traps, and fallen branches hide holes and debris.
Reading a fallen or leaning tree
Trees fail in a handful of recognisable ways, and each one carries a different risk. A whole tree that has tipped over with its root plate lifted is often surprisingly stable once it has come to rest, but the plate can rock back upright when the trunk is cut, which is how people get pinned. A trunk snapped part way up leaves a jagged stem under tension, sometimes with fibres still connecting the top. Torn limbs hung up in the crown can drop with no warning in the next gust.
Saturated ground makes everything worse. After several days of rain, clay and pumice soils lose much of their grip, and trees that came through the wind upright may start to lean over the following days. Fresh soil cracks, mounding at the base or a lifting lawn near a tree within falling distance of the house are reasons to get a qualified arborist out quickly.
The simple rule for homeowners: if a cut would release stored tension, or if the tree is still attached to its roots and leaning, leave it. Anything bigger than a forearm, or anything involving ladders, is professional work.
When floodwater reaches the house
Water through the house changes the priorities. Timber on the lawn can wait a week; wet subfloors, insulation and wall linings cannot. Mould starts to establish within a couple of days in warm, humid conditions, and summer storms in the upper North Island provide exactly that.
The first practical steps are to photograph everything before moving it, lift what can be lifted, and get air moving once it is safe to open up. Carpet and underlay that has sat in dirty water is almost always a write-off. Plasterboard that has wicked water up from the floor usually needs cutting back above the tide line.
Drying a house properly takes equipment most households do not own: commercial dehumidifiers, air movers and moisture meters that show when framing is genuinely dry rather than just dry to the touch. Where the damage is extensive, firms that do flood restoration in Auckland and other centres can assess moisture levels, strip out what cannot be saved and document the drying process in a way insurers tend to expect.
Insurance, records and the cleanup order
Insurers generally want to see damage before it is cleared, unless leaving it creates further risk. Take wide photos showing the tree in relation to the house, then close-ups of the root plate, any broken fence or roof, and the water line on walls.
A sensible order for the following days looks something like this:
- Make safe: power, water, gas, hung-up limbs, anything leaning on the house.
- Protect the building: tarp roof damage, start drying wet areas, move valuables.
- Notify insurers and get assessments booked.
- Remove timber resting on structures, then timber blocking access.
- Clear the rest of the section, mulch what can be used, and deal with stumps later.
Costs vary widely. A small fallen tree on open lawn might cost a few hundred dollars to cut and remove; a large tree across a roof that needs a crane can run to several thousand. Expect delays after a regional event.
Frequently asked questions
Is it the homeowner’s job to remove a neighbour’s tree that fell onto their section? It depends on circumstances and the insurance policies involved. Many households start with their own insurer, who will advise.
Can a tree that survived the storm still be dangerous? Yes. Saturated soil and root damage can cause trees to lean or fall days after the wind has dropped. Watch for new cracks in the soil, heaving at the base or a lean that was not there before.
How long does a flooded house take to dry out? Small areas with good airflow may dry in a week or two. Saturated subfloors and wall framing often take several weeks with commercial drying equipment, and moisture readings are the only reliable way to know.