You walk into your freshly renovated flat and there's a strong, sometimes sweet, sometimes sharp smell that isn't dust. Friends and family say "ah, new house smell lah, very nice." But what actually is it, and should you be concerned?
What causes the smell
That distinctive new home smell comes from several sources simultaneously:
VOCs from paints and coatings. Water-based paints used in most Singapore renovations off-gas Volatile Organic Compounds as they cure. Most of the heavy off-gassing happens in the first 2–4 weeks post-painting, with lower-level emissions continuing for months.
Formaldehyde from carpentry. This is the big one. Particle board, MDF, and plywood — the materials in your built-in wardrobes, kitchen cabinets, and TV console — are manufactured using formaldehyde-based adhesive resins. New carpentry off-gases formaldehyde for weeks to months after installation.
Formaldehyde is a known irritant and at elevated concentrations, a carcinogen. The relevant question isn't "is there some formaldehyde?" (there always is with new carpentry) but "is the concentration elevated enough to cause concern?"
Adhesives and sealants. Tile adhesive, waterproofing compounds, vinyl flooring adhesive, and silicone sealant all contribute to the initial chemical smell profile.
New fabric and furnishings. Sofa fabrics, curtains, and carpet (if any) may add their own off-gassing to the mix.
Is it actually dangerous?
For most people in a well-ventilated flat, the exposure from normal renovation materials is not immediately dangerous. However:
- People with respiratory conditions (asthma, allergies) may experience more sensitivity
- Infants, elderly, and pregnant women are more susceptible to elevated VOC exposure
- A flat with very new heavy carpentry + new paint + little ventilation can have measurably elevated formaldehyde levels for the first 4–8 weeks
The precaution is proportional to the risk: ventilate well before moving in, especially if anyone in the household has respiratory sensitivity.
How to reduce the smell and exposure
Ventilate aggressively before moving in. Leave all windows open, run fans, for as long as possible before occupying the flat — ideally 1–2 weeks after handover. This dramatically reduces the initial concentration of off-gassing chemicals.
Run the aircon before sleeping in the flat. Cold air slows chemical off-gassing somewhat. More practically, running aircon pulls in fresh air through the system and provides some dilution.
Place activated charcoal bags. Activated charcoal adsorbs VOCs and formaldehyde. Place bowls or bags of activated charcoal in rooms with new carpentry — particularly inside new wardrobes and cabinets where concentration is highest. Replace monthly for the first three months.
Indoor plants have a minor effect. Popular advice about plants like peace lilies and snake plants removing formaldehyde is based on NASA research from the 1980s, which used sealed chambers. In a normally ventilated room, the effect of houseplants on VOC concentration is small — nice to have, but not a primary solution.
Request low-VOC or zero-VOC materials. If you're early in your renovation planning, ask your ID or contractor about low-VOC paint options. Most major paint brands (Nippon, Dulux) have low-VOC ranges. The price difference is minor; the off-gassing difference is significant.
A special note on carpet
If you have carpet (less common in Singapore HDB but used in some bedrooms and almost all condos), carpet also off-gases adhesives and synthetic fibres. The recommendation is the same: ventilate thoroughly before full occupation.
When to be more concerned
If the smell persists at high intensity beyond 4–6 weeks of good ventilation, or if household members are experiencing persistent headaches, eye irritation, or respiratory symptoms that improve when you leave the flat — that's worth investigating further.
An indoor air quality assessment (available from licensed environmental consultants) can measure formaldehyde and VOC levels against Singapore's Indoor Air Quality standards. These assessments cost $300–$600 and provide a definitive measurement if you're concerned.
The bottom line
Some new home smell is normal and expected. It diminishes significantly within the first month of good ventilation. Take practical precautions — ventilate before moving in, use charcoal bags in high-carpentry areas — and the smell becomes a background note rather than a daily concern. If it doesn't improve after 6 weeks of ventilation, investigate further.
