Mould Removal Markham
Mould removal Markham residents need can involve anything from a heritage house in Markham Village to a recent townhouse where tightly sealed construction traps humidity.
Fully licensed and insured
Monday to Sunday: Open 24 hours
Markham's mix of old and new
Markham has two quite different housing stocks. Unionville, Markham Village and Buttonville include older houses with original foundations, additions and mature trees whose roots and downspouts affect drainage. Cornell, Berczy, Angus Glen and Milliken Mills are mostly newer, with energy-efficient construction, finished basements and a large share of townhouses.
In tightly built newer houses, humidity has nowhere to go if the ventilation system is not running or is poorly balanced. Winter condensation on windows, a bathroom without proper exhaust and an unused heat recovery ventilator are common reasons we are asked to look at mould. In older houses we more often find seepage and past leaks.
What removal involves in a Markham home
We assess the affected area and the likely water source, then write the scope and price before starting. Work takes place inside sealed barriers with filtered air. Drywall, insulation or carpet that has been colonised is removed and bagged; framing and other hard surfaces are cleaned and dried. When the structure reads dry, finishes are rebuilt.
In a townhouse, we also consider the shared walls. A leak that starts on your side can move to a neighbour, and the reverse is also true, so we discuss how to notify neighbours or the property manager where that applies.
Questions we ask on the first call
- Where did you first notice the smell or staining?
- Has there been a leak, flood or sewer backup in the past few years?
- Is the home a detached house, a semi or a townhouse?
- Does anyone in the household have breathing concerns?
- Is the ventilation or heat recovery unit running as it should?
Humidity is part of the answer
Health Canada recommends keeping indoor relative humidity between 30 and 50 per cent, running a dehumidifier in damp areas such as basements, and watching for condensation on cold surfaces. In a sealed modern house that advice is practical: a simple hygrometer shows you quickly whether your house is drifting into the range where mould grows. We explain readings and what to change as part of the visit.
The Markham process
- Free assessmentWe visit, inspect and take moisture readings.
- Scope and price in writingYou see both before the work is booked.
- Containment and removalBarriers, filtered air and removal of affected materials.
- Drying and rebuildDrying usually takes 3 to 5 days.
Heritage houses and newer townhouses need different care
In Unionville and Markham Village, the older houses often have plaster, original trim and floors worth keeping, and we plan the opening of walls with that in mind. In newer townhouses the finishes are simpler to replace, but shared walls and tight ventilation need attention. In both, we explain what we plan to remove before we start, and we leave the work area clean when containment comes down.
What York Region's flooding factsheet says about mould
York Region's flooding factsheet says mould begins to grow within 48 hours, advises discarding drywall that has been wet for a prolonged period, and says to call a professional for mould greater than one square metre. It advises wearing boots, rubber gloves and a face mask when cleaning mould, and says people with mould allergies or asthma should not clean it. The factsheet lists York Region Health Connection at 1-800-361-5653 (checked November 2026).
Markham mould questions
Does newer construction still get mould?
Yes. Tight, well-insulated houses hold moisture when ventilation is not working, and a plumbing or window leak behaves the same in any age of house.
Is the assessment free?
Yes. The written scope and price follow it.
Do you serve every part of Markham?
Call with your address and we will confirm.
Request a quote
Tell us what you need and we will get back to you. In a hurry? Calling is fastest.