Floor sanding is one of those jobs that sounds straightforward but creates a surprisingly disruptive environment. Whether you can stay in another part of the house depends on the size of the job, the equipment being used, how well the work area can be sealed off, and whether anyone in your household is particularly sensitive to dust or noise. In most cases, your tradesperson will recommend you — and especially any children, elderly people, or pets — vacate for at least the duration of the sanding and coating work.
Why Floor Sanding Is So Disruptive
Modern floor sanders use dust-extraction systems that capture the majority of fine particles, but no system is 100% effective. Fine timber dust still escapes into the air and can travel through gaps under doors, through ventilation systems, and into adjoining rooms. This dust is a respiratory irritant and, depending on the timber species, may carry allergens or even mild toxins.
Beyond dust, there are two other major factors:
- Noise – Commercial drum and edge sanders are extremely loud, often exceeding 90 dB. Even with doors closed, this level of noise is uncomfortable and potentially harmful over extended periods.
- Coating fumes – Once sanding is complete, the floor is coated with oils, stains, or polyurethane finishes. Many of these products release volatile organic compounds (VOCs) that require good ventilation to disperse safely. Solvent-based finishes in particular have strong fumes that can cause headaches, dizziness, or nausea.
What Affects Whether You Can Stay?
Every job is different. Here are the key factors your floor sander will consider:
| Factor | Lower Risk (may be able to stay) | Higher Risk (best to leave) |
|---|---|---|
| Job size | Single small room | Whole house or open-plan |
| Dust extraction | High-end HEPA system | Older or basic equipment |
| Sealing off the area | Easy to isolate with doors | Open-plan, shared ventilation |
| Finish type | Water-based low-VOC coating | Solvent-based polyurethane |
| Household members | Healthy adults | Children, elderly, pets, asthmatics |
Dust and Health Considerations
Fine wood dust is classified as a respiratory hazard by WorkSafe NZ. Prolonged or repeated exposure can cause irritation to the nose, throat, and lungs. Some exotic or treated timbers carry additional risks. Even with dust extraction running, it's wise to treat the work area as off-limits and keep adjoining spaces well ventilated.
If anyone in your household has asthma, allergies, or a respiratory condition, the safest approach is to leave the property entirely until the dust has settled and the coatings have fully cured — which can take 24–72 hours depending on the product used.
Fumes From Floor Coatings
The sanding itself is only part of the process. Once the floor is bare, your tradesperson will apply a sealer and finish coat. Water-based finishes have lower VOC levels and dry faster, making them more compatible with staying nearby. Solvent-based finishes (such as traditional oil-modified polyurethanes) have much stronger fumes and typically require the space to be vacated and well ventilated for longer.
Always ask your floor sander what products they plan to use and follow their guidance on re-entry times. Reputable NZ coating brands such as Wattyl and Dulux publish technical data sheets with ventilation and re-entry information — your tradesperson should be familiar with these.
Practical Tips If You Do Stay
If the job is confined to one room and you genuinely need to remain in the house, discuss it with your floor sander beforehand. They may be able to:
- Seal doorways with plastic sheeting and tape to contain dust
- Schedule coating work for when you can step outside for a few hours
- Use water-based finishes to reduce fume exposure
- Work in stages so part of the house remains liveable
That said, always follow your tradesperson's advice — they know their equipment and products best.
Pets and Children
Pets and young children are more vulnerable to dust and fumes than healthy adults. Dogs and cats are low to the ground where dust settles, and children breathe more air relative to their body weight. Always arrange for pets and children to be off-site during sanding and coating, and until the floor is fully cured.
When to Call a Professional
Floor sanding is skilled work that requires the right machinery, technique, and knowledge of timber species and finishes. An inexperienced operator can easily sand through a thin wear layer, create uneven surfaces, or apply coatings incorrectly — all costly mistakes. A qualified floor sander will also advise you honestly about whether your household can safely remain during the work.
You can find experienced, local floor sanding professionals on tradedirectory.co.nz. Always ask about the dust extraction equipment they use, the type of coatings they recommend, and their re-entry guidelines before booking.
