Painting and render defects in new homes — how to identify them and what you can claim

Paint and render defects are among the most visible complaints after moving into a new home, and also among the most debated — because paint quality is partly subjective and builders routinely argue that observed issues are within acceptable tolerance. Understanding what the applicable standard says, and how to assess defects correctly, gives you the evidence base to support a legitimate claim.

The applicable standard: AS/NZS 4349.1

In Australia and New Zealand, the defect assessment standard most widely cited for interior and exterior painting in residential buildings is AS/NZS 4349.1 — Inspection of buildings: Pre-purchase inspections — Residential buildings. More directly, the HIA/MBA defect assessment criteria reference the principle that finishes are assessed from a 1.5 metre viewing distance, under normal lighting conditions, not with oblique raking light or close inspection with a torch.

This “1.5 metre rule” is important. If a painting defect is only visible when:

• You press your nose against the wall
• You use raking light from a torch or the sun through a window
• You look at a specific angle

…then it may not meet the legal threshold for a defect in a residential context. Builders frequently invoke this standard to dispute complaints that are real but marginal.

However, defects that are clearly visible from 1.5 metres under normal room lighting are legitimate claims. The assessment standard works both ways — it protects builders from unreasonable demands, but it also confirms that visible defects must be rectified.

Interior painting defects

Paint runs and sags

A run or sag occurs when too much paint was applied, causing it to flow downward before drying. Runs visible from 1.5 metres under normal lighting are a workmanship defect. Common locations: behind doors, around window reveals, above skirting boards, on ceiling-wall junctions.

Missed areas or thin coverage

Missing patches, holidays (areas where paint skipped the substrate), or obviously thin coverage are defects. Thin coverage may only become apparent under certain lighting — but where the substrate colour or texture is showing through in a patch that would not be expected under a normal two-coat system, this is defective.

Sheen inconsistency

If your specification called for flat/matte paint and the finish has inconsistent sheen variation (patches of glossy or satin sheen within an otherwise flat area), this indicates over-rolling or contamination. Similarly, if your walls were specified in a mid-sheen and one wall has a clearly different sheen level, this is defective.

Paint on incorrect surfaces

Paint overspray or marks on window glass, door hardware, light fittings, switchplates, or tile surfaces are defects that should be cleaned before handover.

Visible joins between coats or patches

In a correctly applied two-coat system, individual roller strokes and coat joins should not be visible under normal lighting from 1.5 metres. If they are, the paint was applied incorrectly — the coats were not applied wet-to-wet within the required time, or the painter failed to maintain a wet edge.

Colour variation

Visible colour variation within a single wall, or between walls specified in the same colour, indicates that insufficient coats were applied or different batches of paint were used without checking batch numbers. Manufacturers’ recommendations for number of coats should be followed.

Exterior painting defects

Exterior paint has additional requirements due to its exposure to UV and weather. Defects specific to exterior painting:

• Peeling or flaking within the warranty period — exterior paint should not peel or flake within the first two to three years under normal weather conditions. If it does, this indicates incorrect surface preparation, use of an interior paint in an exterior application, or application in wet or cold conditions contrary to the manufacturer’s specification
• Blistering — paint blisters (bubbles) form when moisture trapped in the substrate is released as vapour; indicates either painting over a damp substrate or insufficient substrate preparation
• Chalking — a powdery surface on weathered exterior paint is normal over time, but chalking visible within the first year indicates use of an incorrect or under-quality product
• Lap marks — visible horizontal bands on rendered or masonry surfaces indicate wet-to-dry overlapping during application

Render defects

External render is applied over masonry or fibre cement sheeting. Render defects include:

Cracking

Not all render cracks are defects. Shrinkage cracks during curing (hairline, random patterned) are considered normal in most render products. However:

• Map cracking (also called crazing) — a regular pattern of small cracks covering a large area, indicating the render mix was too rich in cement or applied in excessive thickness in a single coat
• Step cracks — cracks that follow mortar joints in the masonry beneath, indicating differential movement between the render and substrate
• Cracks at re-entrant corners (window and door reveals) — these are common and indicate the lack of reinforcement at stress concentration points; render reveals should include angle beads or mesh reinforcement
• Through-cracks — cracks that penetrate the full depth of the render coat, potentially allowing water ingress

Where cracks allow water ingress, they become a weathertightness issue and may cross the threshold from minor to major defect.

Hollow render (delamination)

Like tiling, render can debond from the substrate. A hollow sound when tapped indicates delamination. Delaminated render is at risk of falling (safety concern), especially on external walls above eye level.

Render profile and flatness

Render should produce a flat, consistent surface. Depressions, waves, or build-up marks that are visible from normal viewing distance are workmanship defects.

How to photograph painting and render defects

The key to photographing paint defects is light angle:

• For runs, drips, and texture defects: Take photos in raking light (angle your phone torch at about 45 degrees to the wall surface). This highlights surface texture variations that are invisible in direct frontal light
• For coverage and colour defects: Use normal frontal lighting — if the defect is visible here, it clearly meets the 1.5 metre standard
• Always include context shots: One wide photo showing the room/wall, then closer photos of specific defects with a ruler for scale

Date your photos. Timestamped photos taken during or immediately after your practical completion inspection (PCI) are particularly valuable because they establish that the condition existed at handover, not as a result of your own occupation of the property.

What to put in your defect notice

For paint and render defects, your defect notice to the builder should specify:

• The exact room and wall/surface (e.g., “master bedroom, west wall, approximately 800 mm above floor level”)
• The nature of the defect (run, hollow render, colour variation)
• The size or extent (a single drip vs a 300 mm patch vs an entire wall)
• A reference to the photograph(s) attached to the notice

Avoid subjective language like “the paint looks bad” — use objective, measurable descriptions that mirror how a building inspector would document the same issue.

Key Takeaways

• Paint defects in Australian residential buildings are assessed from 1.5 metres under normal lighting conditions — defects that only appear under raking light or close inspection may not meet the legal threshold, but those visible at normal viewing distance must be rectified
• Paint runs, sags, missed areas, sheen inconsistency, and visible joins are all workmanship defects claimable during the defects liability period (DLP) and statutory warranty period
• Exterior paint that peels or blisters within the first two to three years is a defect indicating incorrect preparation or application
• Render cracks fall on a spectrum: hairline shrinkage cracks may be normal, map cracking and through-cracks are defects, and cracks allowing water ingress are potentially major defects
• Always photograph painting defects with raking light to capture texture; include context shots and a ruler for scale
• All defect notices should be specific, factual, and referenced to dated photographs — vague complaints invite dispute