What we look for in Mirrabooka, and why it differs from the suburb next door. 9.6 km from the CBD, 9.6 km from the coast, postcode 6061.
Mirrabooka was Yirrigan, established in 1954, the word meaning elevated. A satellite city was planned here and abandoned by 1982, at which point the suburb was formally created and renamed. So despite carrying the name of a 1950s project, the suburb itself is largely 1980s and 90s.
That distinction catches people out. Buyers associate Mirrabooka with the Commission era suburbs around it and expect 1950s and 60s stock. What they generally find is housing from the bushland subdivisions north of Yirrigan Drive, built in the 1980s and 1990s.
Thirty to forty years old, in other words. Roofs and roof plumbing arriving. Hot water. Wet area waterproofing at the end of its run. Asbestos less likely than in the older Mirrabooka Project suburbs, though not absent in the earliest houses.
The old name is accurate. The suburb is genuinely elevated, with the shopping centre and much of the housing sitting on top of a hill, which brings slope, cut and fill platforms, retaining and drainage that runs downgradient. On a sloping block that is where the money goes wrong.
Lots run from around six hundred to nearly nine hundred square metres, and there are still vacant lots in the east.
Inland, so salt and delignification sit low on the list, and the roof inspection concentrates on fixings and workmanship instead.
Built on subdivided bushland, which means two things. Cleared block settlement where fill was placed, and retained bush along reserve edges holding established colonies close to housing.
Blocks against reserve carry steadier pressure than the interior streets do.
On thirty to forty year old stock the original barrier has reached the end of its life and most have not been renewed. Find the durable notice where one exists, check the date, then look at the perimeter, because decades of landscaping generally bury the slab edge.
On sloping sites, retaining walls are both a food source and something holding damp soil against a structure, so they deserve attention on both counts.
On a sloping block the retaining serves both inspections. One asks whether it is holding. The other asks what is living in and behind it. That is the same wall, and it should be looked at once. Reported under AS 4349.1 and AS 4349.3.
Establish the build era before anything else, because the suburb name misleads. A house here is far more likely to be from the 1980s or 90s than from the Commission period, and the whole inspection follows from that.
Vacant lots in the east mean ongoing construction, which brings handover inspections and condition records for finished houses beside the work. On sloping blocks, staged inspections while retaining and drainage are open are worth having, since neither can be reviewed later without digging it all up again.
Walk the low corner of a sloping block before buying. Water ends up there and retaining fails there first, and neither is visible from the front door.
Despite the 1950s Mirrabooka Project name, the suburb itself is largely 1980s-90s, because the bushland was subdivided late, which makes it younger than its State Housing Commission neighbours Balga and Nollamara, a different era with different defects. So the first thing to correct is the assumption that Mirrabooka is old post-war stock. Most of it is not, and the inspection reads the 1980s-90s brick-and-tile accordingly, into its first-to-second maintenance cycle rather than the fifty-to-seventy-year-old fabric of its neighbours.
Mirrabooka is genuinely elevated (the name Yirrigan means elevated), so there is some slope, cut-and-fill and drainage running down-gradient to consider on the hillier blocks. Built on subdivided bushland, it carries cleared-block settlement and bush-edge termite pressure where reserves remain. Inland, salt and delignification are low priority. A Mirrabooka inspection corrects the era assumption first, reading younger stock than the suburb's name suggests, then weighs the elevated-ground slope and drainage and the bush-edge termite pressure. The gap between the historic project name and the actual build era is the thing to keep straight here.
The era is the first thing to get straight on a Mirrabooka home, since despite the historic project name most of the suburb is 1980s-90s, so the inspection reads brick-and-tile into its first-to-second cycle rather than genuinely old post-war fabric: the switchboard, wiring, hot water, roof and wet areas are the age-appropriate items. The elevated ground drives checks on slope, cut-and-fill and down-gradient drainage on the hillier blocks. Built on subdivided bushland, the slab is read for cleared-block settlement and, where reserves remain nearby, the perimeter and subfloor are checked for bush-edge termite pressure. Inland, salt stays a low priority throughout.
None of it is guesswork. Reading the stock above into an inspection, these are the checks the Mirrabooka pattern pushes to the top of the list:
Mirrabooka 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 Mirrabooka:
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.
Dianella, Koondoola and Noranda sit on the same ground as Mirrabooka, 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.
Nollamara is 2.4 km away but sits on the Spearwood dune system; Westminster is 2.4 km away but sits on the Spearwood dune system; Balga is 3.0 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 Mirrabooka 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 →
9.6 km inland through Wanneroo, Mirrabooka sits between the coastal and inland problems, and the fee reflects it — some salt-corrosion checking on an older tiled roof, but more attention to drainage, wet areas and ground movement across the Wanneroo area.
Pre-purchase building inspection in Mirrabooka →
Building and pest inspection in Mirrabooka →
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.
Mirrabooka is 9.6 km from the coast — outside the highest-exposure band, but close enough that salt-driven delignification is worth checking in an older tiled roof.
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.
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