Asbestos Survey and Testing in London, Ontario

An asbestos survey in London costs $300 to $600 for most houses: we walk every area your renovation or demolition will touch, sample each suspect material, send the samples to an accredited lab, and give you a written record of what is and is not asbestos. A single-material test, such as one stipple ceiling, is $200 to $350. Results take two to three business days. We test and survey only. We never remove asbestos, which is why the result can be trusted.

Asbestos survey or asbestos test: which one you need

The two words get used interchangeably, but they answer different questions, and buying the wrong one is how people end up paying twice.

An asbestos test answers one question about one material: is this ceiling, this floor tile, this pipe wrap asbestos? You point at it, it gets sampled, the lab answers. It is the right purchase when exactly one material is about to be disturbed and nothing else in the house is in play.

An asbestos survey answers the question a renovation actually raises: of everything this job will cut, sand, lift or break, which materials contain asbestos, where are they, and what condition are they in? It is a room-by-room walk of the work area, a sample from each distinct suspect material, a lab result for each one, and a written record that ties every result to a location and a photograph. A contractor can price from it. A buyer can rely on it. You can hand it to whoever does the work next year.

If more than one material in a pre-1990 house is going to be disturbed, you want a survey, not a stack of single tests. It costs less than three separate visits and it leaves nothing out.

When Ontario law calls for an asbestos survey

Ontario does not use the phrase "asbestos survey" in a homeowner's rulebook. What it does is put duties on owners before work starts, and a survey is how those duties are met in practice.

• Owners on construction projects. Under section 30 of the Occupational Health and Safety Act, before a project begins the owner has to determine whether any designated substances are present on the site and prepare a list of them. Asbestos is one of the eleven designated substances. If the work is tendered, the list goes into the tender, and the constructor must have a copy before a binding contract is signed. An owner who leaves a substance off the list that they ought reasonably to have known about is liable to the contractors for the resulting loss. (Ontario's guide to the Act sets this out.)
• Before demolition, alteration or repair. Under the asbestos regulation, O. Reg. 278/05, an owner tendering this kind of work must have an examination carried out to establish whether material likely to be disturbed is asbestos-containing, or have the work done as though it were. Demolition may only go ahead once asbestos that may be disturbed has been removed to the extent practicable. (Ontario's guide to the regulation covers both.)
• Buildings where asbestos is known. Owners of buildings where asbestos-containing material has been used must keep a record of its location and condition and update it at least every 12 months, as part of an asbestos management program.

Where a London homeowner sits. Ontario's guide states that the regulation's owner duties do not apply to the owner of a private home occupied by the owner or their family, or to a residential building of no more than four units where the registered owner lives in one of them. It also states that the regulation does apply to the constructors, employers and workers doing renovation, repair or maintenance in those same homes (source). That is why a careful contractor asks for a survey before quoting your basement or kitchen even though you, personally, are exempt. A landlord with five or more units, a commercial owner, or anyone tendering a project is in a different position and should treat the survey as a requirement.

Asbestos surveys before renovation and demolition

A pre-renovation survey covers the rooms and assemblies the job will open: walls, ceilings, floors, mechanical runs, and anything behind them that a saw will reach. A pre-demolition survey covers the whole structure, because everything comes down, so it usually needs more samples than a single-room renovation and sits toward the top of the range, with the exact figure confirmed on the call.

Either way, the survey is only useful if it happens before the quote. A contractor pricing a basement finish or a teardown without one is guessing at the most expensive variable in the job.

Asbestos surveys when buying or selling in London

A home inspector will often write "possible asbestos-containing material, recommend testing" next to a stipple ceiling or an old furnace duct, and stop there. Inside a condition period, a survey of the materials the inspector flagged, plus anything you already plan to renovate, turns that line into a lab result you can negotiate with. Sellers of older homes use the same report to answer the question before a buyer's inspector raises it. Book early: the visit takes an hour or two, the lab takes two to three business days, and rush turnaround is available when a waiver date is close.

Why a mold inspection company is the one telling you this

Because in London the two problems arrive in the same week, and almost nobody warns you.

The sequence is ordinary. A basement takes water in the spring melt or a July storm. Mould grows behind the finished wall. A remediation crew is hired, and the standard procedure for a sizeable job is to cut out and remove the affected porous material, taking drywall and ceiling tile back well beyond the visible growth. In a house built before 1990 that saw is going through drywall joint compound, and the crew is lifting old vinyl tile off the slab to get at the subfloor, and pulling pipe and duct insulation out of the way to reach the wall cavity.

Those four materials are the most common asbestos-containing materials in a Canadian house, and they are precisely the materials a mould job disturbs. Ontario's own abatement guideline says so plainly: the Environmental Abatement Council of Ontario's Mould Abatement Guidelines state that their mould procedures do not address designated substances such as asbestos, and name joint compound, ceiling tiles, pipe and duct insulation and vinyl flooring as the materials to check first.

A mould remediation done without an asbestos check in a pre-1990 London home can turn a contained moisture problem into a house-wide fibre problem, and the invoice for fixing that is an order of magnitude larger. It is a cheap thing to rule out and an expensive thing to discover afterwards.

If you are about to hire for removal, read how to scope a mold removal job first. The asbestos question belongs in that scope, before a quote is signed, not after a wall is open.

Which London houses actually have it

Health Canada is direct about the timeline: before 1990, asbestos was mainly used to insulate buildings and homes against cold and noise, and for fireproofing. Canada brought in regulations in 2018 prohibiting the import, sale and use of asbestos and of products containing asbestos, with a limited number of exclusions. That ban stopped new asbestos going into buildings. It did nothing at all about what is already in them.

London's housing stock sits squarely inside the affected window in two distinct layers:

• The pre-war core. Old North, Old South and Woodfield, where plaster assemblies, boiler and pipe wrap in stone-walled basements, and decades of later patching all stack on top of each other. A 1915 house has usually been renovated three or four times, and the asbestos-bearing layer is often from the 1950s work rather than the original build.
• The postwar and mid-century expansion. The bungalows and side-splits that filled out Westmount, Oakridge, Huron Heights, Glen Cairn and White Oaks through the 1950s, 60s and 70s are the peak era for taped drywall with asbestos joint compound, 9 inch vinyl floor tile set in black mastic, and textured ceilings.
• The near-campus conversions. Single-family houses around Western and Fanshawe that were carved into student units carry an extra layer of undocumented renovation work. Nobody kept records, and the person who did the work in 1978 is not available to ask.

You cannot identify asbestos by looking at it

This is the single most useful thing on this page, and it is the same principle that governs everything we do with mould: the eye does not diagnose, the lab does.

There is no colour, no texture and no smell that identifies asbestos. Two ceilings that look identical can differ entirely, because the product line changed mid-decade or because the second one was installed four years later. Age narrows the odds and nothing more. The only answer comes from a bulk sample analyzed under polarized light microscopy at an accredited laboratory, which is a small, specific, inexpensive test.

How the regulation sorts the work once a survey finds asbestos

O. Reg. 278/05 is administered and enforced by the Ministry of Labour, Immigration, Training and Skills Development. Two things about it matter once the lab results are back:

1. The regulation sorts the work by risk, not by the presence of asbestos. Type 1 operations are low-disturbance work with correspondingly light precautions. Type 2 covers moderate disturbance with more formal containment. Type 3 is the highest-risk category, requiring enclosure, negative air pressure and decontamination. Knowing the classification before anyone prices the job is the difference between a careful afternoon and a sealed containment running for days.
2. A positive result does not mean the material has to come out. The regulation is built around disturbance, not presence. Intact, undisturbed material that nobody is about to cut is frequently best left exactly where it is, recorded and monitored.

When a survey or a test is worth it in London

• Before a mould remediation opens walls or lifts flooring in a pre-1990 home. This is the one most often missed, and it is the reason this page exists.
• Before any renovation or demolition that will cut, sand, scrape or break a suspect material.
• Before flooring goes over or comes off an old tile floor in a basement.
• When vermiculite is in the attic, before insulation work, wiring, pot lights or storage.
• Inside a condition period on a purchase, where a home inspector has flagged a suspect material and you need to know before you waive. The same timing logic as buying a house with mold applies.
• After damage, where material is already broken or crumbling.

And when it is not worth it: a material that is intact, in good condition, that nobody is about to touch, in a house where no work is planned. Testing that material buys you a piece of paper and changes nothing. We will tell you that on the phone.

Vermiculite in the attic is its own conversation

Loose-fill vermiculite is the granular, pebbly, gold-to-brown insulation poured into attics and sometimes into block cavities. Much of what was sold in North America came from a single mine that was contaminated with amphibole asbestos, so Health Canada's guidance is to treat vermiculite insulation as though it may contain asbestos and not to disturb it.

In practice that means: do not use that attic for storage, do not run new wiring or pot lights through it, do not sweep it, and seal the cracks and openings between the attic and the living space rather than going up there to tidy it. If you need to know for certain, it takes a multi-point, full-depth sampling protocol rather than one grab sample, because the contamination is not evenly distributed. That is why it is priced separately below.

If your reason for going into the attic in the first place was staining on the roof sheathing, read attic mold inspection before anyone goes up there.

What we do, and what we will not do

We collect samples, document where each one came from, send them to an accredited laboratory under a chain of custody, and give you a plain written report of what came back. That is the whole product.

We do not remove asbestos, we do not subcontract removal, and we take no fee from anyone who does. Ontario does not issue a contractor's licence for asbestos abatement the way it licenses an electrician, so the vetting falls to you: ask which classification of work the contractor is planning, ask about worker training under O. Reg. 278/05, and ask for a WSIB clearance certificate and proof of liability insurance. Get two or three quotes written against the same lab results.

We also do not tell you what asbestos has done to your health. Nobody holding a lab report can. Exposure history and symptoms belong with a physician, and the same rule applies here as on our is black mold dangerous page: the lab identifies the material, the doctor addresses the person.

Common questions