What we look for in Forrestfield, and why it differs from the suburb next door. 13.5 km from the CBD, 22.1 km from the coast, postcode 6058.
Forrestfield sits at the base of the Darling Scarp, and local folklore says the name came from Charles Hale, who settled here in 1902 and planted crops among the native forest. Forest and field. Whether or not that is the true origin, it describes the ground accurately.
Cleared forest and bushland at the scarp base is the underlying condition. Foothill ground, variable, with gravel and laterite mixing into plain sand and clay depending on where a block sits.
It is a large suburb at over seventeen square kilometres, which means that variation is real. Establishing what a property is founded on matters, and it should inform how any movement is read.
The location brings two separate noise sources, and they are different in character. Perth Airport is close, so aircraft noise applies and the published contours are worth checking for a specific address. The Kewdale and Welshpool freight and industrial precinct is also nearby, which means road freight and rail freight operating to schedules that do not respect residential hours.
Both are permanent. Go and listen before you commit.
Housing runs from post-war through a 1970s and 80s bulk to newer infill, with some semi-rural holdings on the scarp edge to the east. So the era range is wide and dating a property comes first. Eastern scarp-edge blocks back onto bush, which brings a BAL assessment into the picture.
Cleared forest ground has a specific legacy. When bush is cleared for housing, stumps and root systems are frequently pushed over and buried rather than removed, and buried timber decaying in ground that holds moisture is exactly what a subterranean colony establishes on.
None of it is visible. None of it can be taken out now. It simply sits there, decaying slowly, doing what buried timber does in ground that holds moisture.
The eastern edges back onto retained bush, which supplies continuous habitat, and blocks along that boundary face steadier pressure than the interior streets.
On the post-war and 1970s stock the original barrier has long finished and few were replaced. Decades of garden have buried the slab edge or the subfloor vents in most cases.
On semi-rural holdings the exposure spreads across the site rather than sitting at a house perimeter, so sheds, fence lines and stacked timber all come into it.
On a suburb this varied, working out what a property actually is takes time, and both assessments depend on that same judgement. Making it once produces a more coherent result than two visits forming separate views. Reported under AS 4349.1 and AS 4349.3.
On the semi-rural blocks, agree in writing which structures are included before anyone attends. Sheds are the thing people assume are covered, and the assumption is usually wrong.
Check both the aircraft contours and the freight proximity. They are separate issues with separate schedules, and a property can be affected by one and not the other. Renovation and infill bring staged inspections and condition records for the house next door.
Forrestfield sits on the Guildford Formation — alluvial clay and sandy clay laid down by the Swan and Canning systems. This is the reactive ground. Clay here shrinks and swells with moisture, which is what puts stepped cracking through brickwork and takes doors out of square between seasons. Articulation joints matter on these sites, and a great many older houses do not have them where a current standard would want them.
What that means in practice, on a house in Forrestfield:
Landform is assigned from the suburb's position on the Swan Coastal Plain rather than from a site soil test. It tells you what to expect, not what you have. A site classification to AS 2870 is a different exercise and a different report.
Wattle Grove, Kewdale, Maida Vale and High Wycombe sit on the same ground as Forrestfield, so the footing behaviour and the drainage problems tend to repeat across all of them. If you are comparing houses across those suburbs, you are largely comparing the same site conditions.
East Cannington is 4.3 km away but sits on the Bassendean dune system; Lesmurdie is 4.9 km away but sits on the laterite foothills of the Darling Scarp. That is the useful thing about this part of Perth: the ground can change inside a few kilometres, and with it what an inspection is looking for.
On site classification: any soil zone quoted for a suburb is indicative, inferred from geography rather than surveyed. A real AS 2870 classification comes from geotechnical work on your actual block and can differ from the one next door. We report what we observe; we do not read your soil class off a map.
The inspection is visual and non-invasive, over the readily accessible areas, reported to AS 4349.1. Our inspectors physically enter the roof space, as long as there is sufficient access. Report within 24 hours of the inspection.
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Flat fee, the same in Forrestfield as anywhere: $440 inc. GST for a pre-purchase building inspection, or $616 inc. GST with the timber pest scope added in the same visit. Full price list →
Well inland at 22.1 km from the coast, out in Kalamunda, coastal salt is not the first thing an inspection in Forrestfield chases. The fee buys closer work on footing movement, site drainage and the reactive-ground behaviour of the South East suburbs, with delignification checked only where a tiled roof meets a busy corridor.
Pre-purchase building inspection in Forrestfield →
Building and pest inspection in Forrestfield →
Yes. Our inspectors physically enter and inspect the roof space, as long as there is sufficient access to do so safely. Where access is restricted, the report says so plainly rather than implying we saw more than we did.
At 22.1 km inland, Forrestfield carries lower coastal-salt exposure, so delignification is not the first thing we would expect. It remains possible near heavy arterial corridors or industrial emissions.
Within 24 hours of the inspection itself, not 24 hours from booking. On a pre-purchase or pre-settlement job that timing is the whole point, because your leverage disappears once you are committed.
We would rather you checked than took our word for it. These are the bodies that actually hold the records and set the rules:
Tell us about the property and what you need. We'll come back to you with a firm quote and a time.
PERTH