Render repairs and crack repair in Geelong

Render repair means cutting out failed render, fixing whatever made it fail, and patching or re-rendering so the new work matches the old. The hard part is the diagnosis. A crack, a hollow patch or a salty white crust at the base of a wall each has a different cause, and a patch that ignores the cause will fail again.

Common faults and what usually causes them

What you see	Likely cause	What a repair normally involves
Fine map cracking across the surface	Shrinkage when the render dried too fast	Fill and recoat with a flexible system
Straight vertical crack over a joint	Movement at a wall junction or missing control joint	Cut a proper joint, seal, patch
Stepped or diagonal crack from a window corner	Footing or frame movement, sometimes a rusted lintel	Find the cause first; may need an engineer or builder
Drummy or hollow sound, bulging	Render has lost its bond with the wall	Cut out the loose area back to sound render and re-render
Crumbling render and white salt crust near the ground	Rising damp and salt attack	Diagnose the damp source before any render goes back
Brown staining from a crack	Rusting steel lintel or beads	Treat or replace the steel, then patch

Salt damp in older Geelong brick

Older solid brick and bluestone buildings in Geelong’s inner suburbs, and the post-war brick homes further out, can both show salt attack where the damp course has failed or been bridged by garden beds, paving or earlier render. The Salt attack and rising damp guide, written by David Young for Heritage Victoria, the Heritage Council of NSW and South Australian agencies, describes a rich cement render at the base of a wall as a common but poor treatment: the render stops the damp evaporating, so it climbs and causes decay above the render.

The same guide sets out what to do instead. Remove the hard render with care, brush off surface salts, reduce the salt in the wall, and only then decide whether the wall should go back to face brick or be re-rendered. If it is re-rendered and salt may remain, the guide says the new render should be sacrificial, designed to take the salt and be renewed over time. That is a different job from patching a cosmetic crack, and a provider should say which one they are quoting.

What a provider will look at

1. Where the cracks run and how wide they are. A tape measure and photos with a coin or ruler in frame help a lot.
2. Whether the crack is still moving. A provider may suggest marking the ends with pencil and dating them, then checking a few weeks later.
3. Steel in the wall. Lintels over windows and corner beads rust, swell and crack render. Coastal homes are more exposed.
4. Drainage and garden levels. Soil or paving piled above the damp course feeds damp into the wall.
5. The existing render type. A patch should be compatible with what is there. Hard cement patched into soft lime render will crack along the edges.
6. The whole elevation. Patches on a painted wall almost always need the full wall repainted to look right.

How a repair job runs

1. Sound the wall and mark out every loose area.
2. Cut out to sound render with a straight edge so the patch has a clean border.
3. Fix the underlying problem: seal a joint, treat a lintel, lower a garden bed, or refer the structural issue on.
4. Prime or wet the exposed base as the patch product requires.
5. Build the patch up in layers to the depth of the existing render, matching the texture.
6. Let it cure, then recoat or repaint the whole wall face.

Costs

The Geelong guide published by What’s The Damage in October 2026 lists crack repair and patching at $46 to $93 per sqm and removal of old render at $14 to $37 per sqm. Small repairs are often charged as a minimum job rather than by area, so ask how a quote is built. Recoating after repairs adds the texture or paint rate shown on the texture coating page.

When the repair is no longer just a render job

A diagonal crack that is wide, growing, or appears with sticking doors and windows can mean the house is moving. That calls for a structural engineer or a registered builder. Consumer Affairs Victoria’s registration checklist says re-stumping, re-blocking and any building work that needs a building permit must be done by a registered practitioner, whatever the price.

If the home is in a Heritage Overlay, repairs that are not done to the same details, materials and specifications as the original can need a planning permit under the Greater Geelong Planning Scheme. Matching the original render and colour avoids that question.

What a careful renderer will refuse

• Covering a moving structural crack with a skim coat and paint.
• Patching salt-damaged render with hard cement without dealing with the damp.
• Leaving rusting steel in place behind a fresh patch.
• Quoting a repair from one blurry photo with no look at the rest of the wall.

Next steps

Photograph each crack with a measure in shot, note when you first saw it and whether it has grown, and take a wide photo of the whole wall. Send your render repair details and independent renderers can say whether it is a patch, a re-render or a job for an engineer first. Each one quotes on their own terms. For the inner suburbs with the oldest walls, see the Geelong area page, and for full re-rendering after repairs, the cement rendering page.

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