The Ultimate Mold Inspection & Testing Guide Toronto [2024]

Updated on 07-May-2024

Molds are fungi invisible to the naked eye found in nature. They are carried into homes by drafts, humans and pets. To grow, molds need water and nutrients, such as drywall or cardboard. When growing heavily, molds can cause health problems.

Most Canadian take on debt over ten or even twenty years in order to become homeowners. As such, it is strongly recommended to go for Best mold inspection in Toronto before carrying out any purchase transaction. This assessment aims to identify minor or major problems that a property presents, and which may, moreover, decrease its value or present a potential danger to its inhabitants.

After a thorough visual examination, the mold inspector will note the items that require repair or replacement in a report that will be sent to you. The goal is obviously to allow you to renegotiate the terms of the promise to purchase to cover the costs to be paid. By option for an mold removal Toronto expert your chances of stumbling upon a house with hidden defects like molds are considerably reduced.

In this guide, you will learn everything about mold inspection in Toronto. Know how mold inspection is done, complete process. Get yourself educated before going for professional help. 

Know the Presence of mold

Molds are often found in damp and poorly ventilated places.

They can grow all over the house. Some signs indicate the presence of mold or excessive humidity:

  • the presence of spots of various colors, but often greenish or black,
  • on walls, ceilings, or carpets,
  • around the windows,
  • in wardrobes, etc .;
  • the presence of a characteristic musty, earthy odor;
  • the presence of dark circles, warping, flaking, or other signs of water infiltration on walls or ceilings, which may indicate the presence of a problem hidden behind the materials.

Usually, it is not necessary to have the air or surfaces analyzed to confirm the presence of mold. In fact, when mold is visible or there are signs indicating its presence, it is rather necessary to carry out a careful mold inspection of  house in Toronto to find the cause and take the appropriate measures to correct the situation.

If you are a tenant or landlord and you have noticed the presence of mold in a dwelling, consult UMC. It offers mold testingmold remediationair quality testing services in Toronto, Mississauga, Brampton.

At least once a year, inspect the exterior of the house to make sure everything is in good condition:

  • roofing;
  • coating;
  • attic;
  • gutters;
  • sealing of joints;
  • drainage, etc.

Perform regular housekeeping on the house as well as a complete mould inspection of all rooms at least once a year. This makes it possible to detect traces of water infiltration and mold:

  • behind the furniture;
  • in wardrobes and storage spaces;
  • in the basement, etc.

Why You Should Have A Mold Inspection?

Signs of fungus and humidity

Some of the common reasons to suspect you might have a fungus and moisture problem include:

  • You are suffering from allergic symptoms
  • You notice a musty smell
  • You have had a problem with water, for example: flooding, leaking pipes or a leaky roof.

Hiring a professional inspector

It is always best to hire a professional mold inspector to do an inspection for you. Thanks to the experience of mold inspectors and their knowledge of the most common places where mold hides, you can be sure that if there is any mold in your home, they will find it.

Mold inspectors also use special equipment, such as fiber optic and moisture meters. This allows them to find the hot spots where mold is most likely to be and look into the most hidden areas, such as behind walls. This way they can find all the hidden mold without disturbing your home.

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    3 Reason You Must Get Mold Inspection Done In Toronto


    UMC wants to take care of you, your health and your home, that is why we give you various tips to prevent mold from appearing in your home, or in case you have this problem, we explain how you can solve it. Are you getting sick in your home? Do you smell a moldy/musty odor? Beyond a hygienic or aesthetic issue, mold in our home favors the appearance of diseases in the respiratory tract, fever, cough and rhinitis, with children being the most vulnerable.

    Prolonged exposure to mold can even seriously affect people with asthma or related allergies. If we talk about diseases, mold is the cause of the so-called ‘sick building syndrome’, generally appreciated in modern buildings that are usually airtight and have few ventilation and air exchange channels.


    Are you about to buy a home or investment property? Are you sure you didn’t have a mold problem with the previous owner? Although required by law, sellers don’t always disclose mold or water damage issues in a real estate transaction. Although most home inspectors will report mold they see during their inspection, they will not go out of their way to find it and take no responsibility for it.


    If you have a water damage event, you may want to check that mold has not grown as a result. If your toilet, tub, or washing machine is overflowing, you might think you can just blot up all the water. But what about water getting into the sub-floor or seeping into baseboards, drywall, and wall studs?

    Goals of a Mold Inspection

    There are two goals of a mold inspection. The first is to find if and where mold is growing in your home. The second is to find the water problem which caused the mold to grow in the first place.

    What happens during a mold inspection?

    Microbiological analysis of ambient air and surfaces (molds, fungi)

    According to Health Canada, it may be necessary to take and analyze mold samples that can be used to detect the first signs of fungal contamination (mold), as well as fungal growth in wall cavities or pipes. ventilation which is not perceptible during an investigation.

    See also  20 Most Common Mold And Fungi Terms - Mold Glossary

    In our experience, there are several other reasons that may require an indoor air analysis, including:

    • Health – Identification of contaminants to make a causal link with a disease or symptoms experienced
    • Legal causes – Identification of contaminants as legal evidence during a conflict, to require the execution of work or repair of a hidden defect or to present a second opinion
    • Buying a house or building – Unfortunately, the home inspector cannot do an invasive inspection. We realized that in nearly 99% of cases, the building inspector is not sufficiently trained or equipped to fully understand the extent of a problem related to fungal contamination (mold).

    All analyzes are carried out by a Microbiologist in a laboratory accredited by the Ministry of Sustainable Development, Environment, and Fight Against Climate Change specialized in mold analysis and indoor air quality.

    Mold Inspection Equipment

    Before any inspection, we conduct a brief questioning to find out about the various discomforts felt by the occupants of the building. In addition, an analysis of the history of the building often makes it possible from the outset to target certain problem areas.

    Each investigation includes the following services and measures:

    • The general appearance of the house/building exterior and interior, odors detected on arrival
    • Assessment of general and specific parts
    • Geographic location and drainage
    • Taking the moisture levels of materials (material humidity) in depth (gypsum, plaster, sub-floor, wood, concrete.)
    • Use of a fiber optic borescope for viewing in inaccessible places (ventilation, inside partitions)
    • Opening of the partitions and floor to document the problems confirmed at the level of the wood structure, insulation and concrete
    • Temperature measurement of partitions and windows to check for condensation on materials using an infrared thermometer or a thermal camera.
    • Measurement of relative humidity, temperature and dew point of the ambient air using a high-precision electronic psychrometer
    • Measurements of carbon dioxide (CO2) levels to verify air changes
    • Type of ventilation (air exchanger, HRV, etc.), advice on cleaning and operation
    • Taking digital photos for report documentation
    • Thermographic inspection by a certified inspector available.

    Mold Toronto Process

    There are an estimated 1.5 million species of mold in the world. Molds reproduce by generating cells called spores that spread through the air. Mold growth occurs in the presence of a high level of humidity.

    In the built environment, they can damage materials, decrease the quality of indoor air and, depending on the extent of their growth and the duration of exposure and the state of health of the person exposed to them, they can affect human health. Regular inspection of the premises is therefore of crucial importance.

    Air quality analysis

    When it is possible to meet the occupants, it is essential to observe their living environment and to ask them about their habits. This analysis will thus make it possible to determine the problematic habits of the occupants and to guide them towards healthier choices in order to improve the air quality inside their home.

    Site analysis

    The second part of the inspection consists of evaluating the building components as well as their design in order to detect problems attributable, among others, to water infiltration, condensation, water leaks, flooding, or the malfunction of a device.

    The presence of mold is detected by observing black, green or gray spots or white fluffy formations (not to be confused with a mineral formation such as efflorescence). An earthy, musty smell often indicates the presence of mold.

    During an inspection, the presence of dark circles, curls or other signs of water infiltration, recent or not, on the cladding and elements of a building testify to moisture problems that favor the appearance of mold visible or hidden behind materials. It may even be beneficial to inspect the building while it is raining to detect hidden problems in dry weather.

    See also  6 Tips To Control Mould Growth At Your Home Effectively

    Finally, as a complement to the analysis of the living habits of the occupants, it is very interesting to note the relative humidity level and the outside temperature as well as the temperature of the various rooms inspected.

    Professional Mold Inspection & Testing Toronto

    We can provide either a COMPLETE (whole home), a LIMITED (room or section of the one or building) mold inspection with slides, swab, wall cavity, carpet, and indoor air quality testing available. upon completion you will receive a written report and a lab report of all tested items.

    Mold Inspection Checklist Toronto – PDF – Free Download

    Precautions to Take to Protect Yourself When Cleaning

    To avoid unnecessary exposure to mold, it is recommended to wear:

    • protective glasses;
    • rubber gloves;
    • a dust mask.

    These items are available inexpensively at hardware stores.

    Avoid cleaning when other people are in the room. This measure particularly concerns the most vulnerable, such as:

    • children;
    • people with asthma or allergies.

    Make sure to ventilate the premises well before allowing your loved ones to reenter them.

    How much does a mold inspection cost in Toronto?

    The price of a mold inspection varies from region to region in Toronto. You guessed it, the further you get from Montreal, the lower the prices. Obviously, the cost varies according to several criteria, including the age of the house, its dimensions and whether you want to have extra items evaluated.

    The prices presented in this article are given for information purposes only, hence the interest in submitting quotes to several mold inspectors to find the best service at an attractive price.

    Count $ 300 to $ 400 to have a mold inspected and between $ 450 and $ 550 for a single-family home. Prices can go up to $ 650 for a duplex, $ 700 for a three-story triplex, and can go over $ 800 for a larger property.

    A good mold inspector in Toronto should devote about eight hours of work to you, including travel, inspecting the building (minimum 2 to 3 hours), analyzing photos, researching and writing the report.

    Avoid mold growth

    Act quickly in the event of water damage in Toronto

    The presence of stagnant water, infiltrations or water-soaked materials promotes the development of molds.

    Clean and completely dry any water damage within 24 to 48 hours. Beyond this period, molds can develop.

    Discard porous materials heavily damaged by water such as:

    • gypsum panels;
    • the rugs;
    • cardboard tiles;
    • insulators;
    • mattresses;
    • furniture upholstered or covered with fabrics, etc.

    Avoid having too high humidity in your home

    The regular presence of condensation on windows or walls may indicate that the ambient humidity is too high. To avoid increasing the indoor humidity level:

    • Limit frequent long showers.
    • Turn on the fans when bathing, showering and cooking food.
    • Make sure the dryer hose is securely connected to an outside outlet.
    • Limit the use of the humidifier and carefully follow the maintenance instructions provided by the manufacturer.
    • Empty and clean the dehumidifier tank regularly. In summer, it is usually recommended to install it in the basement. Follow the instructions provided by the manufacturer to ensure proper operation.
    • Make sure that the humidity in the air in the house is kept low enough to prevent condensation from forming (usually between 30% and 55%). Devices that measure the humidity in the house (hygrometers) are inexpensively available at most hardware stores.
    • Avoid storing firewood indoors.

    Ventilate adequately

    Open windows, if necessary, to ventilate the house.

    Make sure the air exchanger or other ventilation system is used properly and follows the maintenance instructions.

    Eliminate mold

    It is important to identify and correct any cause of water accumulation or infiltration such as a broken pipe, flooding or sewer backup.

    Clean affected surfaces without delay and discard damaged porous materials

    For small areas (a window sill, for example):

    • remove stains with a clean cloth and all-purpose cleaner. It is not recommended to use bleach;
    • dry the surface well.

    If the affected areas are large (more than 1 m 2), numerous, difficult to clean or if mold returns after cleaning:

    • call on a specialized company. This will be able to better assess the extent of the work to be undertaken and help you detect and correct the source of the problem;
    • discard porous and heavily water-damaged items.