Air Quality Testing in Mississauga

Full breakdowns: air quality testing cost, mold testing cost and asbestos testing cost.

We test Mississauga homes and workplaces for mold and asbestos, the two things behind most indoor air quality questions we get. Our own inspectors come to you, an accredited lab analyzes every sample, and a mould air test is CAD 550 plus tax with the outdoor baseline and written report included. You get a flat-rate quote before anything is booked.

Most people who call us from Mississauga have one of two things going on. Either water got in during 2024 and the smell never quite left, or a renovation is coming and somebody asked what's in the ceiling. We've done more than 15,000 inspections since 2005, and both start the same way: look first, sample what needs it, let the lab decide.

Last updated: 6 November 2026

Mississauga is younger than Toronto, but more than half of it still predates 1991. Of the city's 244,575 occupied homes in the 2021 census, 37.9% were built before 1981 and 57.5% before 1991. Health Canada says asbestos was mainly used in buildings before 1990, which puts more than half the city inside that window.

The citywide number is a blend of two very different places. The south and east filled in during the 1950s, 60s and 70s. The north and west went up after 1990. Statistics Canada doesn't publish housing age by named neighbourhood, so the table below uses postal areas (the first three characters of your postal code), with the neighbourhoods each one mostly covers.

Source: Statistics Canada, 2021 Census Profile by forward sortation area, occupied private dwellings by period of construction. Postal areas don't follow neighbourhood lines exactly, so read the names as a guide.

Don't lean on that table too hard, though. An average can't see inside your walls. A 1972 Clarkson backsplit may have a basement finished in 2012, and a 2003 Churchill Meadows house won't have asbestos in its drywall but can still have a wet corner behind the furnace. We test the material in front of us, not the year on the listing. As a rough guide:

Mold doesn't care when your house was built. It needs water, and Mississauga got a lot of it in one summer. On July 16, 2024, the City recorded upwards of 106 mm of rain in four hours, which the conservation authorities called slightly more intense than a 1 in 100-year storm. A month later, on August 17 and 18, some parts of the city took upwards of 170 mm.

The bills were huge. The Insurance Bureau of Canada put the July flash floods across Toronto and southern Ontario at over $940 million in insured damage, and the August storms, which hit Mississauga and Etobicoke hard, at more than $100 million. Lots of those basements were dried, painted and moved back into within weeks.

That last part is where we come in. Health Canada says a home is less likely to grow mould if it's dried within 48 hours, and Peel Region's flood advice is to remove soaked materials at least 50 cm above the high-water line. In a storm that hit a whole neighbourhood at once, with every restoration crew booked solid, plenty of basements got neither. If yours is one of them and it still smells, that's worth checking.

Towers get their own version of the problem. About 27% of Mississauga homes are in apartment buildings of five storeys or more, and roughly 25,000 of those units are in buildings put up before 1981. Up there, the water comes from a window that sweats all winter, a leak from the unit above or a bathroom fan that barely moves air, not from a creek.

Here's something most mold companies won't put on their website: Health Canada does not recommend testing the air for mould in most situations. An air test can't predict health effects, and there's no health-based exposure limit for indoor mould in Canada, so no report can stamp your air "safe".

We think that's mostly right. If the growth is visible and you know where the water came from, you probably don't need us to sample it. Fix the leak and clean it up. That's why a visual inspection, at CAD 95 plus tax, is on our price list at all.

Health Canada also names the case where air testing does help: a concern that stays unexplained after an inspection, especially after flooding or leaks that may have reached into wall cavities. A Mississauga basement that took water in July or August 2024 and still smells a year later fits that description well. That's when our mold testing earns its fee, because we compare the indoor samples against an outdoor baseline taken the same day.

Once sampling makes sense, an accredited third-party lab analyzes the samples. The person who took them isn't the one grading them. It's the same lab we use everywhere else, at the same price.

Mold testing

Air samples in the rooms you're worried about, one outdoor sample as a baseline, and surface samples where there's growth we can see. The lab names the spore types and counts them. Mold testing can also confirm a space after a cleanup crew finishes.

Asbestos testing

Small samples of the materials you're about to disturb, such as ceiling texture, floor tile, drywall compound or pipe wrap, sealed on site and analyzed under a microscope. Asbestos testing gives a yes or no for each sample.

1. 1

   Before the visit

   You tell us what's going on

   Call or send the form. You get a flat-rate quote based on how many samples the job will probably need.

2. 2

   Visit day

   We walk the home before sampling anything

   Moisture readings, the basement, bathrooms, windows and any material you plan to open up. The samples go where the question actually is.

3. 3

   Within 1 business day of the visit

   You get the written inspection report

   What we found, where we sampled and why, in plain language.

4. 4

   2 to 5 business days for mold, 3 to 4 for asbestos

   The accredited lab sends its results

   Surface samples usually come back faster than air samples. Rush analysis is available for an added fee.

You can read more about what happens during an inspection before you book.

If you're pulling a permit to demolish a house in Mississauga, the City's list of required documents doesn't include an asbestos report. Brampton's residential package doesn't either. That surprises people, and it's easy to read it as "no one cares". The rules sit somewhere else.

They're in Ontario Regulation 278/05. Section 10 says an owner must have materials likely to be disturbed examined for asbestos before tendering or arranging demolition, alteration or repair. Section 2(4) exempts an owner of a private home that they or their family live in, and an owner of a building with up to four units when one is lived in by the registered owner or family. So the landlord of a Cooksville apartment block, a condo corporation in City Centre or the owner of a Meadowvale office building has that duty. A family renovating its own Applewood bungalow doesn't.

The exemption covers the owner, though, not the work. The regulation still applies to the contractors and workers doing it, so a careful contractor will want to know what's in that ceiling before cutting into it. We're inspectors, not lawyers, so check your own situation if it's close.

How many samples you need depends on who you are. A homeowner who just wants to know before opening a ceiling can usually sample each material once. An owner covered by the regulation has to meet its minimums, which start at three samples for most materials (the asbestos testing page has the full table). We'll tell you which case you're in when we quote, so you're not paying for samples you don't need or missing ones you do.

A positive result isn't an emergency. If you're not renovating, the material can often stay where it is. If you are, a qualified abatement contractor handles the removal. We don't do asbestos abatement or removal, and the written report tells the contractor you hire exactly what they're dealing with.

About 30% of Mississauga households rent and 28.2% of homes are condominiums. If that's you, the leak behind the mold may not be yours to fix, so start with whoever can fix it.

We need the owner's approval, or someone the owner authorizes, before we inspect a property. Tenants without that approval can still book a virtual inspection for CAD 100 plus tax, which is often enough to know what to raise with the landlord. Property managers and owners of larger buildings should look at our commercial air quality testing.

Mississauga prices are the same as everywhere else we work. All prices are in Canadian dollars, plus tax.

The number of samples moves the total, not the size of the house. A few typical Mississauga jobs:

• A Meadowvale basement that flooded in 2024 and a bedroom above it, both sampled for mould: $810.
• A one-bedroom condo with a wet window and a musty closet, one air sample: $550.
• An Applewood bungalow before a kitchen reno, with the ceiling texture and the old floor tile sampled once each: $680.

You'll find cheaper quotes online, and some are fair for what they include. Before you compare, ask if the price covers lab analysis, an outdoor baseline and a written report. Those three things are what make a result useful to a contractor, a landlord or an insurer.

Our inspectors cover the whole city. We don't have a Mississauga street address to list, so everything books by phone or through the form. Some of the neighbourhoods we serve:

• South Mississauga: Port Credit, Mineola, Lakeview, Lorne Park, Clarkson, Southdown, Sheridan
• Central: City Centre, Cooksville, Mississauga Valley, Fairview, Erindale, Creditview, Hurontario
• East: Applewood, Dixie, Rathwood, Malton
• North and west: Meadowvale, Lisgar, Erin Mills, Churchill Meadows, Streetsville, East Credit, Meadowvale Village

The rest of Peel Region tells two different stories, and they change what we'd look at first.

Source: Statistics Canada, 2021 Census Profile, occupied private dwellings by period of construction, structural type and tenure, for the city and by forward sortation area.

West of Mississauga, our Oakville air quality testing page covers Halton and Hamilton. Closer to the core? Our Toronto air quality testing page covers the city, York Region and Durham. The service areas page lists every city with its own page, and a quick call settles the rest.