Formaldehyde after a renovation: new cabinets, floors and finishes

The smell of a new kitchen is part of the experience for many people. Some of it is formaldehyde, released by composite wood, glues and finishes. Health Canada's guidance explains why renovated homes have higher levels for a while and what to do about it, without turning a renovation into a panic.

Where it comes from

Health Canada lists sources in homes as off-gassing from construction or renovation materials, furniture, cabinets and household products, including glues, paints, varnishes, floor finishes, wallpaper and composite wood products. Combustion adds more: tobacco smoke, improperly vented gas or oil appliances, fireplaces and wood stoves, and vehicle exhaust from an attached garage. A renovation can add many of these sources at once.

Why it matters

Formaldehyde is an irritant; high concentrations can cause burning in the eyes, nose and throat. Health Canada says long-term exposure to moderate levels may worsen asthma, especially in children and infants. Its indoor air guidelines are 123 µg/m³ (100 ppb) over 1 hour for irritation, and 50 µg/m³ (40 ppb) over at least 8 hours to protect children with asthma; below 50 µg/m³ no adverse effects are expected. Average levels measured in Canadian homes are roughly 10 to 40 µg/m³.

Choosing materials

Health Canada's renovation advice is to choose low-emission products when possible, and to choose composite wood furniture or cabinets with plastic laminate or coating on all sides, or to seal them yourself. Raw, unsealed edges and backs of particleboard or MDF are an easy detail to miss: ask the cabinet supplier how all faces are finished, including the inside of boxes and shelves.

During and after the work

Increase ventilation and open windows, especially when painting, varnishing or installing carpet with glue. Health Canada says ventilation is the best control, because indoor levels are higher than outdoor levels. Levels are generally higher in new or newly renovated homes; off-gassing decreases over time but may take weeks, months or years to fully stop, and is often higher in summer because heat and humidity increase release. Health Canada suggests keeping humidity around 50 percent in summer and 30 percent in winter.

Testing and symptoms

Health Canada says testing is generally not necessary. If levels are a concern, remove sources and increase ventilation, and consult a health care provider if anyone has related symptoms. For households with someone with asthma, schedule finishing work, such as floor finishes and glued carpet, when windows can be opened, and consider leaving the renovated rooms aired out before they are used.

Prevention Checklist

• Choose low-emission paints, adhesives, finishes and composite wood.
• Ask for cabinets and furniture with laminate or coating on all sides, or seal raw edges.
• Open windows and ventilate while painting, varnishing and gluing.
• Keep ventilating in the weeks after the work, especially in summer.
• Keep humidity around 50% in summer and 30% in winter.
• Do not run vehicles or gas equipment in an attached garage.

References

1. Health Canada. Formaldehyde in your home (modified 2021-01-11), Web page, Sources, health effects, guideline values, reducing exposure, renovation, testing. Accessed 2026-11-03.

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