What we look for in Forrestdale, and why it differs from the suburb next door. 22.9 km from the CBD, 11.8 km from the coast, postcode 6112.
Forrestdale covers twenty eight square kilometres and holds barely a thousand people. That makes it one of the largest and least populated suburbs in the City of Armadale. Forrestdale Lake and the wetland system around it define the place.
The district structure plan covering this area names a high water table among its planning challenges, so this is documented rather than inferred. On the lower parcels expect groundwater close to the surface, drainage that has to work rather than merely exist, and ground that behaves quite differently in July than a comfortable February inspection would suggest.
Twenty eight square kilometres holding a thousand people means large rural and semi-rural holdings, so the property is the inspection rather than the house. Septic or aerobic treatment systems. Bore or tank water. Long private driveways. Sheds and outbuildings that form part of the purchase and are covered by nothing an inspection of the dwelling includes.
There is a detail in the historical record worth noting. Electricity reached most of the district in 1948 but not Forrestdale, which came later. A district serviced late tends to have older infrastructure arriving in stages, and on rural holdings that can still show.
The same structure plan names offsite impacts from poultry farms and kennels among the district's issues. Both are lawful operations, both generate odour and noise, and both are better understood before purchase than after a still summer evening.
A major lake and wetland system, plus a documented high water table, puts this suburb at the higher end of termite pressure. The moisture is structural rather than accidental. It does not depend on a leak.
Wetland vegetation around the lake holds established colonies, and on a large holding the dwelling sits within that landscape rather than at its edge.
Rural properties spread exposure across the whole site. Sheds sitting directly on soil. Fence lines with posts driven into damp ground across long boundaries. Stacked timber and equipment that has not moved in years.
On low ground a subfloor can be damp enough to make inspection genuinely difficult, and we report where access stopped. Settle the scope in writing beforehand, because on holdings this size which structures are included is the question people assume rather than confirm.
Covering a large rural holding takes hours once the outbuildings and services are included, and the same walk serves both assessments. Reported under AS 4349.1 and AS 4349.3.
Read the district structure plan before buying. It names the constraints on this area directly, it is public, and it tells you things about the ground that no inspection of a finished house ever could.
Buyers want the bore and the treatment system assessed as specific items. Neither is covered by assumption. Both are expensive. On low blocks, look at the ground in winter if the timing allows. Near a wetland that is the version that comes with the property, and February will not show it to you.
Forrestdale sits on the Bassendean dune system — deep leached grey quartz sand, almost pure, and very free draining. Bassendean sand is about as unreactive as a building site gets, so seasonal footing movement is rarely the story here. The water table is the story. Parts of this system sit over the Gnangara Mound and the standing water level can be within a couple of metres of the surface.
What that means in practice, on a house in Forrestdale:
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.
Jandakot Regional Park is the fixed point most people in Forrestdale navigate by. Buildings like it are useful to an inspector for a duller reason: they date the area. Whatever era put that up is usually the era that put up the houses around it, and the construction methods of that decade are what we expect to find in the roof.
Piara Waters, Harrisdale, Haynes and Seville Grove sit on the same ground as Forrestdale, 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.
Banjup is 4.6 km away but sits on the Spearwood dune system; Treeby is 4.9 km away but sits on the Spearwood dune system. 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 Forrestdale 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 →
11.8 km inland through Gosnells, the inland setting changes what the fee buys in Forrestdale: footing and slab movement, drainage and the reactive soils of the South East belt come first, and coastal delignification is a lower priority away from the arterial corridors.
Pre-purchase building inspection in Forrestdale →
Building and pest inspection in Forrestdale →
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 11.8 km inland, Forrestdale 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