Damp that comes in sideways behaves differently, appears at a different height, and is not fixed by a damp course.
Talk it throughRising Damp Perth arranges damp assessments across Perth metropolitan area.
Where ground is retained against a wall — a sloping block, a split level, a garage cut into a rise — water in that soil pushes through the wall horizontally. It shows as a patch or a band at the height of the retained soil, not as a tide-mark near the floor.
Subiaco, Mount Lawley and the older parts of Claremont sit on enough slope for this to be common, and it is frequently created by a renovation that built the ground up behind the house.
The work is drainage and tanking rather than injection: relieving the water behind the wall, then applying a barrier on the wet face. A chemical damp course does nothing here, and being quoted one is a sign the diagnosis was rushed.
What follows is indicative. Every one of these is a range because the wall decides, not the website.
| Work | Indicative range | What it covers |
|---|---|---|
| Assessment and moisture survey | $250 - $450 | Moisture readings across the affected walls, a look at ground levels and drainage, and a written finding on which of the four common causes you actually have. |
| Chemical damp-proof course, per metre | $180 - $340 | Injected into the mortar course. Limestone generally sits at the upper end because it takes more material to achieve a continuous barrier. |
| Salt-retarding replaster, per square metre | $120 - $260 | Old contaminated render off, breathable system on. Frequently the larger part of the job. |
| Drainage and ground-level correction | $900 - $6,000 | Lowering paving, cutting back garden beds, adding a drain. Where the cause is bridging rather than a failed damp course, this is the fix. |
| Subfloor ventilation improvement | $1,200 - $4,500 | Less common in Perth than Brisbane because fewer homes have a ventilated subfloor, but it applies to the older timber-floored stock. |
Prices are indicative ranges only. Limestone, double brick and rendered walls each cost differently to treat, and every fixed price follows an on-site assessment.
We arrange assessments across the Perth metropolitan area, including:
Rising Damp Perth