If your home was built before 1980, there is a real chance your floors or the paint on them could contain lead — and sanding lead paint without proper precautions is a serious health and safety risk. The good news is that testing for lead paint before you start is straightforward, and taking this step could protect you, your family, and anyone else in the home.
Why Lead Paint on Floors Is a Concern
Lead was commonly used in paints in New Zealand until it was phased out through the late 1970s and into the 1980s. Older homes — particularly villas, bungalows, and state houses built before 1980 — are most likely to have lead-based paint somewhere on the property. Floors, skirting boards, and window joinery are common locations.
When you sand a floor containing lead paint, you generate fine lead dust that can be inhaled or ingested. Lead is toxic, particularly to children and pregnant women, and can cause serious neurological and developmental harm. WorkSafe NZ has clear guidance on working safely with lead, and it is important to understand your obligations before picking up a sander.
How to Tell If Your Home Might Have Lead Paint
Before testing, consider these risk indicators:
- Age of the home: Built before 1980? Lead paint is a real possibility.
- Layers of old paint: Multiple paint layers on timber floors suggest older coatings underneath.
- Chalky or flaking paint: Deteriorating paint increases the risk of lead exposure even before sanding.
- Previous renovations: If the floor has been painted (not just coated with a clear finish), older layers may contain lead.
If any of these apply, treat the floor as potentially containing lead until you have tested it.
Testing Methods for Lead Paint
There are two main approaches available to NZ homeowners:
1. DIY Lead Test Kits
Swab-style lead test kits are available from hardware stores such as Bunnings and Mitre 10. These kits use a chemical reaction to indicate the presence of lead — typically turning a bright colour (often red or pink) if lead is detected.
How to use them:
- Lightly sand or score a small area to expose any underlying paint layers.
- Apply the swab to the exposed area and follow the manufacturer's instructions.
- Test multiple spots, including areas where paint layers are visible.
Limitations: DIY kits can produce false negatives, particularly if lead is present in lower layers but not the topmost coat. They are a useful first step but are not definitive.
2. Professional Laboratory Testing
For a more reliable result, you can collect paint chip samples and send them to an accredited laboratory for analysis. This is the most accurate method. A professional assessor or occupational hygienist can also carry out on-site testing using an XRF (X-ray fluorescence) analyser, which gives immediate, highly accurate results without damaging the surface.
If you are unsure which approach is right for your situation, BRANZ has research and guidance on lead paint in New Zealand homes that is worth reviewing.
What to Do If Lead Paint Is Found
If testing confirms lead paint is present, do not proceed with DIY sanding. Your options are:
- Encapsulation: In some cases, sealing over the lead paint with a suitable coating is a safer alternative to removal. Discuss this with a professional.
- Hire a specialist: A qualified floor sander or lead paint removal specialist with the right equipment, PPE, and disposal procedures should carry out the work. You can find qualified local tradespeople on tradedirectory.co.nz.
- Follow safe work practices: If work must proceed, WorkSafe NZ sets out requirements for controlling lead dust, including containment, respiratory protection (P2 or P3 respirators), protective clothing, and safe disposal of waste.
Building Consent and Regulatory Considerations
Floor sanding itself is generally not restricted work under the NZ Building Code and typically does not require a building consent. However, if your property is a rental, the Healthy Homes standards and general obligations around providing a safe, healthy home apply. Lead paint hazards in a rental context may also trigger obligations under the Health and Safety at Work Act if contractors are involved.
Always check with your local council if you are unsure whether your planned work requires consent, particularly if the floor sanding is part of a larger renovation.
Protecting Your Family During Testing
- Keep children and pregnant women out of the area during any testing or sampling.
- Wear gloves and a dust mask (at minimum) when collecting samples.
- Wash hands thoroughly after handling any paint samples.
- Seal and label any paint chip samples before sending them to a lab.
When to Call a Professional
You should engage a qualified professional if:
- Testing confirms lead paint is present in any layer.
- Your home was built before 1970 and has painted timber floors.
- You are unsure how to interpret test results.
- The floor area is large or the paint is in poor condition.
- You are a landlord with tenants in the property.
A licensed floor sanding specialist or occupational hygienist can assess the risk, carry out safe removal or encapsulation, and give you peace of mind. Find experienced local floor sanders on tradedirectory.co.nz.
