VOCs, or volatile organic compounds, are the solvents that evaporate as paint dries and cures. They are what you are smelling for days after a job is finished, and reducing them is one of the simplest health improvements available in a repaint, particularly in a house that stays occupied while the work happens.
Reading the tin
VOC content is given in grams per litre. There is no single legal threshold for the word "low" in Australia, so the number matters more than the label:
- Under about 50 g/L is generally marketed as low VOC
- Under about 5 g/L is generally marketed as zero VOC, and some Australian
manufacturers now list interior products under 1 g/L
- Older solvent-based enamels can sit several hundred g/L higher
Two things are worth knowing. Tinting adds VOCs back, so a deep colour mixed into a low-VOC base will not be as low as the base on its own. And low VOC is not the same as no odour, because other ingredients contribute smell too.
Independent certification marks such as Global GreenTag are a useful cross-check when a claim on the tin is vague.
Where it matters most
Bedrooms, nurseries, and any room used by someone with asthma or a respiratory condition. Enclosed spaces with limited airflow hold solvent longest: bathrooms, hallways, built-in wardrobes and small studies.
It matters most of all when the house stays occupied. Repainting an empty house you can air out for a week is a different situation from repainting the room someone sleeps in that night.
Has durability caught up?
For walls and ceilings, yes. Water-based low-VOC products now match on washability, coverage and colour retention what solvent-based products offered a decade ago, and for most interior work the trade-off has largely disappeared.
Trim and doors are the more interesting case. Water-based enamels have improved enormously and do not yellow the way oil-based enamels do, which is a real advantage on white trim. They do behave differently during application, and they take longer to reach full hardness than they take to feel dry, so newly painted doors and drawers need a little patience before they get heavy use.
Dry to the touch and fully cured are two different things, and the gap between them is where most avoidable damage happens.
The practical upside
You can usually use the room again the same day instead of airing it out for a week. In an occupied house, that is worth more than any specification on the tin.
