Floor sanding is not inherently unsafe, but it does pose real risks to young children — particularly from fine dust, noise, and potentially lead-based paint — that require serious planning before you start. The good news is that with the right precautions, or by hiring a qualified floor sanding professional, you can protect your family and still get beautiful results.
Why Young Children Are at Greater Risk
Children under five are especially vulnerable to airborne hazards because they breathe faster than adults, spend more time at floor level, and frequently put their hands in their mouths. The main risks during floor sanding include:
- Fine dust inhalation – Sanding generates very fine particulate matter (PM2.5 and PM10) that can penetrate deep into small lungs and irritate airways.
- Lead paint exposure – Homes built before the mid-1970s (and sometimes later) may have lead-based paint under existing floor finishes. Sanding lead paint creates highly toxic dust. This is the single biggest hazard for young children.
- Noise – Industrial drum and edge sanders are extremely loud (often above 100 dB) and can damage children's hearing even with brief exposure.
- VOCs from coatings – Stains, sealers, and polyurethane finishes release volatile organic compounds (VOCs) that can irritate eyes and airways.
- Trip and fall hazards – Equipment, cords, and open containers create physical dangers for curious toddlers.
Test for Lead Paint First — This Is Critical
Before sanding any floor in a pre-1980s home, test for lead paint. You can purchase lead-testing swabs from hardware stores such as Bunnings or Mitre 10, or hire a professional to carry out a more thorough assessment. If lead is present, do not sand the floor yourself — this becomes specialised hazardous work. WorkSafe NZ provides guidance on working safely with lead, and you should engage a contractor experienced in lead-safe work practices.
The Golden Rule: Relocate Children (and Pregnant Women) Completely
The safest approach is to have young children — and any pregnant women — leave the property entirely for the duration of sanding and for at least 24–48 hours afterwards while dust settles and coatings cure. This is not overcautious; it is standard best practice recommended by health authorities.
If temporary relocation is not possible, at an absolute minimum:
- Seal off the work area completely with heavy-duty plastic sheeting and tape over every door gap, vent, and gap at the floor.
- Keep children in a separate part of the house with windows open to the outside.
- Never allow children into or near the work zone during sanding or coating.
Dust Control Measures
Modern professional floor sanders use dustless or dust-minimising systems with integral vacuum extraction. If you are hiring equipment yourself, choose a model with a dust bag and vacuum port, and connect a HEPA-filtered vacuum. Key steps include:
- Seal gaps under doors with draught tape before starting.
- Wear a properly fitted P2 respirator yourself — a basic dust mask is not sufficient.
- Bag and dispose of all sanding dust immediately; do not leave it in open containers.
- Vacuum all surfaces (walls, skirting boards, windowsills) after sanding, before applying any finish.
- Mop hard surfaces with a damp cloth to capture residual fine dust.
Ventilation and Coating Safety
Once sanding is complete, floor coatings introduce a separate hazard. Water-based finishes (such as water-based polyurethane) have significantly lower VOC levels than solvent-based products and are a better choice where children will return to the home sooner. Always follow the manufacturer's re-entry times on the product data sheet. Brands like Resene and Wattyl publish technical data sheets online that specify ventilation requirements and safe re-entry times.
Keep windows and doors open during application and curing, and do not allow children back into coated rooms until the finish is fully cured — not just dry to touch.
Noise Protection
Never allow children near operating sanding equipment. If children must remain on the property (in a sealed-off area), ensure they are as far from the work as possible. Even through walls, drum sanders can exceed safe noise exposure levels for young ears.
Building Code and Healthy Homes Considerations
Floor sanding itself does not typically require a building consent, but if you are replacing flooring or making structural changes, check with your local council. The MBIE Building Performance website is a good starting point for understanding consent requirements. For rental properties, landlords should also be aware of Tenancy Services Healthy Homes standards, which include flooring requirements.
When to Call a Professional
Hiring a qualified floor sanding professional is strongly recommended when:
- Lead paint is present or suspected — this is not a DIY job with children in the home.
- You do not have access to proper dust extraction equipment.
- The floor area is large or the job is complex (stairs, intricate inlays).
- You are not confident in your ability to fully seal off the work area.
- You want the peace of mind of a guaranteed result with minimal disruption to your family.
A professional floor sander will have commercial-grade dust extraction, experience managing hazardous materials, and the right PPE. You can find qualified, local floor sanding professionals on tradedirectory.co.nz.
