What we look for in Mount Richon, and why it differs from the suburb next door. 27.5 km from the CBD, 19.7 km from the coast, postcode 6112.
Mount Richon sits in the foothills of the Darling Scarp, south-east of the Armadale town centre, adjoining Bedfordale. It is an established residential suburb rather than a new estate, and it is built on rising ground.
Slope is the governing condition. On rising foothill ground that means retaining walls, cut and fill platforms, and stormwater that has to be taken down and off a property rather than released onto the block below.
Retaining is where the money goes wrong on ground like this. A wall that has moved is not a cosmetic matter, and replacing one on a sloping site with restricted plant access costs several times the flat-ground equivalent. Height, drainage behind, evidence of movement, and whether anything was engineered rather than simply built.
Foothill ground means granite and laterite at or near the surface. Excavation is awkward and expensive, and rock turns up unannounced, so anyone planning a pool or an extension should get advice on what is underneath before accepting a fixed price.
Being established rather than new, the stock spreads across several vintages, so dating the individual property matters. Older homes here carry the usual mature-stock questions while newer builds raise handover and liability ones.
Bushland and Banyowla Regional Park adjoin on the scarp side, which brings a BAL assessment into the picture. Churchman Brook and Wungong Reservoirs are nearby, so catchment constraints may apply on some parcels.
The regional park boundary is retained vegetation, permanent and unclearable, holding established colonies close to housing on that side.
Being established rather than newly built matters here. A suburb of mixed vintages means barrier ages vary from house to house, and the honest answer on any given property is that it needs establishing rather than assuming.
Older stock will have nothing functioning. Newer builds carry a durable notice. Anything in between is a question.
What is consistent is the ground. Foothill gravel drains, so it is not favourable terrain, but the retaining that comes with every sloping block puts timber into soil in quantity. On a cut-and-fill platform there is retaining above the house and retaining below it.
Subfloor and undercroft access varies enormously with how a house sits on its block. We report what we reached rather than what we hoped to.
Everything decisive on a foothill block sits at the edges. The batter, the wall holding the platform, the line where fill meets rock. Both reports read those same edges, so they are read once. Reported under AS 4349.1 and AS 4349.3.
Get a view of the property from below as well as from the street. A platform looks settled from the front door and tells a different story from the batter underneath it.
On new building, the useful inspections happen before backfill. Once soil goes back against a wall nobody sees the drainage again until something fails.
Neighbouring earthworks are worth documenting. A dispute about cracking is hard to run without a dated photograph of the wall as it stood beforehand.
If a property is near the reservoirs, check whether catchment constraints apply to the lot. They govern effluent disposal and development, they run with the land, and they are public.
Mount Richon 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 Mount Richon:
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.
Banyowla Regional Park is the fixed point most people in Mount Richon 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.
Armadale, Brookdale, Wungong and Seville Grove sit on the same ground as Mount Richon, 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.
Mount Nasura is 2.3 km away but sits on the Guildford Formation; Bedfordale is 3.4 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 Mount Richon 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 19.7 km from the coast, out in Gosnells, Mount Richon is far enough from the water that salt takes a back seat. The same fee goes into footings, drainage and the ground movement typical inland, and the tiled roof is checked for delignification only near heavy traffic.
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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 19.7 km inland, Mount Richon 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