If your home was built before 1980, it almost certainly contains lead-based paint. This doesn't automatically make it unsafe — but it does mean that any renovation, sanding or repainting work needs to be approached carefully.
The Lead Paint Timeline in NZ
| Period | Lead Paint Risk |
|---|---|
| Before 1945 | Very high — white lead paint was standard, high lead content |
| 1945–1965 | High — lead paint widely used on interior and exterior surfaces |
| 1965–1979 | Moderate — declining use, but still common in many applications |
| After 1979 | Low — lead paint banned for residential use in NZ |
If your home was built or renovated before 1980, assume lead paint is present until proven otherwise — especially on window frames, doors, skirting boards, weatherboards, and any previously painted metal.
Why Lead Paint Is a Health Risk
Lead is a neurotoxin. Exposure — even at low levels — can cause:
- Cognitive impairment and learning difficulties in children under 6
- Behavioural problems in children
- Kidney and cardiovascular effects in adults with long-term exposure
- In renovation workers: cumulative exposure through repeated inhalation of lead dust
Children are the highest-risk group. Lead dust from renovation work settles on floors and is easily ingested by toddlers who put their hands in their mouths. Blood lead levels in young children living in pre-1940 NZ homes are measurably elevated compared to children in newer homes.
When Is Lead Paint Dangerous?
Low risk: Lead paint that is intact, well-adhered and covered by subsequent layers of paint. Simply living in a home with intact lead paint poses minimal risk.
High risk situations:
- Sanding or dry-scraping painted surfaces before repainting
- Drilling, cutting or demolishing lead-painted walls, floors or ceilings
- Heat-stripping paint (creates lead fumes)
- Peeling or flaking paint (especially where children can access it)
- Renovating kitchens and bathrooms where lead paint is common under tiles
- Removing old weatherboard cladding
Testing for Lead Paint
DIY test kits — sodium rhodizonate or sodium sulfide swab tests from hardware stores, $15–$30 each. A colour change indicates lead presence. Results can be unreliable on painted-over surfaces or at low concentrations.
Professional XRF testing — an X-ray fluorescence device tests through paint layers non-destructively. Most accurate method. A certified lead assessor can test your whole house and provide a report. Costs $300–$800.
Lab testing — paint chip samples sent to a lab. Accurate and inexpensive ($30–$80 per sample) but requires collecting a chip, which itself disturbs the paint.
What to Do with Lead Paint
Option 1: Leave it alone
If lead paint is intact and you're not renovating, the safest option is often to leave it undisturbed and painted over. Cover with a modern top coat.
Option 2: Encapsulate
Apply a specialist encapsulant (a thick, binding primer) over lead paint. Costs $800–$2,500 for a typical room. Requires no disturbance of the existing paint. Not suitable where paint is already peeling.
Option 3: Controlled removal
Where lead paint must be removed (rotted weatherboards, renovation work), a certified lead removal contractor uses wet methods, containment, HEPA vacuuming, and proper disposal. This is the most expensive option.
| Scope | Typical Cost |
|---|---|
| Encapsulation (one room) | $800–$2,500 |
| Window frames stripped and repainted (lead-safe) | $200–$600 per window |
| Full exterior lead paint removal (villa) | $15,000–$40,000 |
| Full interior lead paint removal (villa) | $20,000–$50,000+ |
Lead-Safe Renovation Rules in NZ
WorkSafe NZ requires that anyone conducting work likely to disturb lead paint must:
- Assess whether lead paint is present before starting
- Use wet methods (not dry sanding) where possible
- Wear appropriate respiratory protection (P2 mask minimum; P3 for heavy exposure)
- Contain the work area and prevent dust spread
- Dispose of lead-contaminated waste as hazardous waste
- Clean up thoroughly using HEPA vacuum, not a standard vacuum or broom
Ask your painter or builder — before any renovation on a pre-1980 home, ask whether they are trained in lead-safe work practices and how they plan to manage lead paint if encountered. A good tradie will have a clear answer.
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