Trees in Close Proximity to Dwelling
Large trees within the foraging radius of the dwelling - typically any tree within 3 m for small species, or within 10 m for large eucalypts - introduce two distinct risks: root-driven soil moisture fluctuation that causes differential footing movement on reactive clay, and a direct termite foraging corridor between a timber food source in the crown or root system and the building structure. Neither defect is always present, but the proximity constitutes a conducive condition that warrants ongoing monitoring.
Severity rationale
Across 3,405 observations - the second most frequently recorded defect in the corpus - the modal score is 3, with scores 2 and 3 together accounting for 99% of findings (1,621 and 1,753 respectively). The severity ceiling is 4, reached in only 23 observations (0.7%), and severity 5 does not appear at all. The average of 2.53 reflects that this is predominantly a watch-and-manage condition rather than an active defect; what moves a finding toward 4 is proximity combined with visible footing distress or confirmed termite activity at the tree base.
Causes
- Large native eucalypts or gums positioned within the termite foraging zone of the dwelling
- Tree roots extracting moisture from reactive clay soils, leading to seasonal shrink-swell cycles under footings
- Root intrusion into subfloor zones or drainage paths, creating concealed moisture and debris accumulation
- Neighbouring trees on adjacent properties where root spread crosses the boundary
- Vegetation planted close to the building after original construction without footing impact assessment
Symptoms to look for
- Trees observed within 3–10 m of the dwelling depending on species and size
- No current wall cracking or footing distress, but risk of future differential settlement on clay sites
- Subfloor debris or root intrusion visible at inspection
- Termite foraging tubes or workings found at tree base, indicating active colony nearby
- Moisture readings elevated in subfloor or wall framing adjacent to tree location
Remedies
- Engage a qualified arborist to assess root spread, species risk, and whether removal or crown management is warranted
- Annual termite inspections by a licensed pest inspector (AS 4349.3 / AS 3660.2) - increase frequency if previous treatment is expired
- Monitor footing-adjacent walls for cracking after the first full summer-winter cycle
- Consult a structural engineer if wall cracking or footing movement is already visible
- Keep subfloor access clear and maintain termite inspection zones around the perimeter
Where we see this most
These suburbs show the highest concentration of trees in close proximity to dwelling in our inspection data (minimum five observations). Click a suburb to see its full defect profile.
Worth asking our inspector about this specifically.
Our inspectors flag this as a conducive condition rather than a confirmed defect. Schedule a termite inspection and an arborist assessment in the first year of ownership, especially on clay soils where seasonal footing movement is common.