A brand-new BTO is one of the worst cases for indoor formaldehyde, and it is nobody's fault — it is just how the flat comes together. You collect the keys to a bare unit, then a full renovation packs in built-in wardrobes, kitchen cabinets, a feature wall, a shoe cabinet and more, all installed within a few weeks. Every one of those is fresh plywood, MDF and laminate, and they all start off-gassing at the same time, right before you move in.
The good news: an empty flat before move-in is the easiest time to deal with it yourself. Nothing is in the way, and you can treat the carpentry while it is still new and off-gassing hardest.
Treat it before you move in
Once the renovation is done and the carpentry is in, set aside an afternoon before the furniture and boxes arrive. Work room by room and focus on the new built-ins — that is where almost all of it comes from in a BTO.
- Built-in wardrobes: open every door and drawer and spray the interiors, shelves and the backs of the doors. Closed wardrobes trap off-gassing, so the insides matter more than the fronts.
- Kitchen cabinets: treat the cabinet interiors, the pull-outs and the carcass under the sink.
- Shoe cabinet and store room: small, enclosed, often forgotten — and they concentrate the smell.
- The bomb shelter (household shelter): a sealed concrete box with a heavy door. Anything you store in there sits in stale air, so treat the new racking and shelving and keep the door open to ventilate when you can.
- Feature walls and the TV console: any large new plywood or laminate surface.
Then the new furniture
New mattresses, bed frames, sofas and flat-pack wardrobes off-gas too, and they tend to arrive around the same time. Treat them as they come in — spray the frame and the inside of any new storage, and give a new mattress a light, even pass and let it dry fully before you put on bedding.
Keep air moving in the first months
Off-gassing is heaviest in the first few months. Open the windows and run fans when you are home, especially before you switch on the aircon for the night. Treating the source plus ventilating clears far more than either on its own.
What to use
For DIY work at home, we make the UCOATE Formaldehyde Remover Spray — a 500ml hand spray that runs on the same SGS-tested chemistry we have supplied to Singapore renovation contractors and resellers since 2018. It is water-based and classified non-toxic under OECD 420, so it is safe to use around children and pets when you follow the directions on the bottle. Rather than masking the smell, it binds the formaldehyde and breaks it down into water and carbon dioxide, and it works in normal indoor light — no sunlight or machines needed. In SGS laboratory testing the formulation removed 93.83% of formaldehyde. You can buy it on Shopee with delivery across Singapore.
How to apply it: shake well, spray evenly from 20–30cm onto the surface, let it dry naturally, and avoid wiping or cleaning the surface for 3–5 days. For stronger smells, give it a second coat after about 30 minutes. One 500ml bottle covers roughly 15–20 m². Skip black, water-sensitive or discolouration-prone surfaces, and test an out-of-sight spot first if you are unsure.
