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How Much Does Mold Removal Cost in Toronto in 2026?

Professional mold remediation with containment, air filtration and post-removal cleaning costs $10 to $30 per square foot in Toronto according to Ultimate Mold Crew, which prices standard attic treatment at $3.50 to $4.00 per square foot of attic floor. Restoration Mate prices a small bathroom job at $1,000 to $3,000 and a standard-scope basement at $2,500 to $8,000.

Page last updated: By The RestorationIndex Desk

What are the headline prices?

  • $10–$30 per sq ftFull-service remediation including containment, air filtration and post-removal cleaning (Ultimate Mold Crew (Toronto))
  • $1,000–$3,000 per projectSmall bathroom mold removal package (Restoration Mate (Toronto))
  • $2,500–$8,000 per projectBasement mold remediation (unfinished or standard scope) (Restoration Mate (Toronto))
  • $2,000–$6,000 per projectAttic mold treatment package (Restoration Mate (Toronto))
  • $3.50–$4.00 per sq ft of atticAttic mold removal priced by attic floor area (Ultimate Mold Crew (Toronto, 2026))
An empty basement at night sealed off with taped polyethylene sheeting from floor to ceiling. A work light standing behind the plastic makes it glow; a zippered entry panel hangs half open onto stripped studs, and a negative air machine sits on the concrete with blue lay-flat ducting running away from it.
Illustration of a mold removal scene, generated for this guide. It is not a photograph of a real job, no company listed on this site appears in it, and it carries no figure. The photographs further down the page are real and are credited to the companies that published them.

Can I price my own mold removal job?

Yes, to within the range the table below publishes. Enter the size of what you are dealing with and these work it out against the same source-cited rates, so the number you get is the published market applied to your job rather than a national average.

What does mold remediation cost by area and scope?

This range rests on 5 independent published sources, across 10 price rows. Where two of them disagree, each row carries the figure of the source it names rather than a band stretched across both, and a figure that was not in its named source was removed.

Read the note under each figure before you compare it with a quote. All 10 rows below carry the caveat their own source attached to the number: what the price does and does not cover, where it is a floor rather than a band, and who has to already be on site for it to hold. That caveat is the usual reason two honest mold removal bids differ.

Mold Removal prices in Greater Toronto Area, re-checked August 2026 against 5 independent Canadian sources. Canadian dollars, a named source on every row, 13% HST on top unless the row says otherwise. 10 of 10 rows also print the caveat their source attached to the figure.

Full-service remediation including containment, air filtration and post-removal cleaning

Typical range
$10–$30
Unit
per sq ft
Source
Ultimate Mold Crew (Toronto)

What the source attaches to it

This is the all-in rate that includes containment and air filtration. The source says companies charge it often, not always.

Small bathroom mold removal package

Typical range
$1,000–$3,000
Unit
per project
Source
Restoration Mate (Toronto)

What the source attaches to it

A contained bathroom job. Mold that has gone behind tile or into drywall needs demolition on top.

Basement mold remediation (unfinished or standard scope)

Typical range
$2,500–$8,000
Unit
per project
Source
Restoration Mate (Toronto)

What the source attaches to it

Remediation only. Reconstruction of anything removed is a separate cost.

Attic mold treatment package

Typical range
$2,000–$6,000
Unit
per project
Source
Restoration Mate (Toronto)

What the source attaches to it

Treatment only. Insulation removal and ventilation correction are usually priced on top.

Attic mold removal priced by attic floor area

Typical range
$3.50–$4.00
Unit
per sq ft of attic
Source
Ultimate Mold Crew (Toronto, 2026)

What the source attaches to it

Standard attic mold treatment. The same source says homeowners pay more when access is hard or the mold is heavier, and works the rate out as $3,500 to $4,000 for a 1,000 sq ft attic.

Containment setup: poly barriers, zippered entry, negative air pressure

Typical range
$300–$2,500
Unit
per project
Source
Mold Busters (Canada)

What the source attaches to it

Depends on the size and complexity of the project. It is a line item on top of labour, which the same source prices at $100 to $200 per hour.

Post-remediation clearance testing (third-party verification)

Typical range
$200–$400
Unit
per test
Source
The Mold Guy (GTA)

What the source attaches to it

Covers a visual check, air sampling and a final report. Restoration Mate publishes a slightly wider $200 to $500 for the same step.

Pre-remediation mold inspection with air and surface sampling

Typical range
$300–$800
Unit
per inspection
Source
Restoration Mate (Toronto)

What the source attaches to it

Inspection and testing together. Extra samples beyond the base package are billed separately.

Drywall replacement after mold tear-out (materials and install)

Typical range
$2–$6
Unit
per sq ft
Source
CPR24 Restoration (Toronto)

What the source attaches to it

Replacement of the board itself. This is rebuild work and is not included in any remediation rate above.

Whole-home remediation

Typical range
$10,000–$30,000+
Unit
per project
Source
The Mold Guy (GTA)

What the source attaches to it

Open-ended at the top; driven by multiple rooms, structure, contents and HVAC contamination risk.

Which mold removal figures are firm, and which are a wide range?

Mold is quoted either against the area being cleared or against the job as a whole. Those two are drawn apart below, so a per-square-foot rate is never read as though it were a job total.

10 of the 10 priced rows on this page are drawn to scale below, grouped so that only rows priced on the same basis ever share an axis. A bar starts at the low figure its source published and ends at the high one, so its length is how much room the scope leaves. That is the part of a quote there is anything to argue about.

Quoted as one figure, not as a rate

  • Post-remediation clearance testing (third-party verification)$200–$400

    per test

  • Containment setup: poly barriers, zippered entry, negative air pressure$300–$2,500

    per project

  • Pre-remediation mold inspection with air and surface sampling$300–$800

    per inspection

  • Small bathroom mold removal package$1,000–$3,000

    per project

  • Attic mold treatment package$2,000–$6,000

    per project

  • Basement mold remediation (unfinished or standard scope)$2,500–$8,000

    per project

  • Whole-home remediation$10,000–$30,000+

    per project

Log scale: every step along the axis multiplies, it does not add.

Quoted by floor area

  • Drywall replacement after mold tear-out (materials and install)$2–$6

    per sq ft

  • Attic mold removal priced by attic floor area$3.50–$4.00

    per sq ft of attic

  • Full-service remediation including containment, air filtration and post-removal cleaning$10–$30

    per sq ft

Log scale: every step along the axis multiplies, it does not add.

1 bar fades out at the right instead of stopping. That is a range whose source published a floor for the top and no ceiling, written here the way the source wrote it, with a trailing plus sign. The bar is drawn only as far as the figure that was actually published. How much further it runs is the question to put to the contractor before signing.

What is inside the containment line, and what is billed outside it?

A remediation quote draws a line around the work area and prices what happens inside it. Several of the things a homeowner assumes are included sit outside that line and are quoted separately, which is why two bids for one basement can be thousands apart and both be honest.

  1. Inside the containment line

    The sealed work area and everything done within it.

    • Poly barriers and a zippered entry
    • Negative air pressure, so disturbed spores do not travel
    • HEPA air scrubbers and negative air machines, billed by the day they are on site
    • Removal of the contaminated material itself

  2. Quoted separately from it

    Real costs on the same job, on their own lines or on nobody's.

    • Fixing the moisture source: rerouting a bath exhaust fan, waterproofing, regrading, a backwater valve
    • Disposal of the contaminated material as construction waste
    • Reconstruction: drywall, insulation, and attic re-insulation back to code
    • The pre-remediation inspection, and a third-party clearance test after

What drives the price?

Scope, contamination and access, in that order. Below is what moves mold removal pricing most in Toronto, each one drawn from a source named in the table above, so you can read a quote and see where the money goes.

  • Affected area in sq ft: Health Canada size classes drive scope: under 1 m² is DIY-able, over 3 m² (about 32 sq ft) requires professional remediation
  • Location and access: attics and crawl spaces add labour time and protective-equipment requirements.
  • Finished vs unfinished space: drywall, flooring and insulation in the way add demolition and rebuild; The Mold Guy prices large or hidden mold projects with demolition, drying, rebuilding and clearance at $10,000+
  • Containment level required (poly barriers, negative air pressure): $300–$2,500 per Mold Busters
  • Equipment days on site: HEPA air scrubbers and negative air machines are billed per day, and this page no longer quotes a GTA day rate because the two rental sources it used to cite cannot be read or are not in this market
  • Fixing the moisture source (rerouting bath exhaust fans, waterproofing, regrading, backwater valve) is priced separately from remediation
  • Disposal of contaminated materials as construction waste: $100–$700 (Mold Busters)
  • Reconstruction: drywall at $2–$6/sq ft plus insulation; attic re-insulation to R-60 code adds thousands
  • Mold type: suspected black mold triggers extra sampling and stricter protocols
  • Testing scope: a pre-remediation inspection is $300 to $800 (Restoration Mate) and a third-party clearance test $200 to $400 (The Mold Guy), usually quoted separately
  • 13% HST: most contractor quotes exclude it
  • Insurance-claim jobs are documented to IICRC S520 protocol and often price higher than cash jobs

What's specific to Ontario and Toronto?

Three things: 13% HST on every quote, a City of Toronto rebate on prevention work, and no provincial licence for this trade at all. National price guides miss all three.

  • Insurance: Ontario home policies cover mold ONLY when it results from a sudden and accidental insured peril (e.g. burst pipe). Water entering from outside requires optional endorsements: sewer backup (drains/sump failure) and overland water (heavy rain, snowmelt): neither is standard. Mold from chronic moisture, slow leaks or deferred maintenance is denied.
  • Many Ontario insurers apply a mould remediation sub-limit of $10,000–$25,000 even when the underlying water loss is covered; costs above the sub-limit plus deductible are out of pocket (McDougall Insurance, isure.ca).
  • City of Toronto Basement Flooding Protection Subsidy: historically up to $3,400 per property at 80% of invoiced cost (backwater valve up to $1,250, sump pump up to $1,750, foundation drain severance up to $400); the City raised the maximum to $6,650 effective May 1, 2026, added a $300 sump-pump battery-backup subsidy, and extended the application window to two years. It funds flood prevention, not mold remediation, but is the main lever against recurrence.
  • HST: mold remediation is a fully taxable service in Ontario: add 13% HST to quoted prices; most GTA contractors quote before tax.
  • Health Canada guidance (Guide to Addressing Moisture and Mould Indoors): there is no numeric 'safe' mould exposure limit; any indoor mould should be removed. Small areas (≤1 m², max 3 patches) can be cleaned by the homeowner with precautions; any single patch larger than 3 m², recurring mould, or suspected hidden mould calls for a qualified professional.
  • Ontario has NO licensing for mold remediation: the industry is unregulated and anyone can market themselves as a mold expert. The voluntary benchmark is IICRC certification (S520 standard, AMRT designation); verify certification, liability insurance, WSIB coverage, and insist on independent third-party clearance testing rather than the remediator grading its own work.
  • Tenants: City of Toronto Public Health treats mould as a health hazard in rentals; renters can report unaddressed mould to 311 / RentSafeTO for bylaw enforcement against landlords.

How can I pay less?

Act inside the first 24 to 48 hours, get more than one quote, and claim every rebate you qualify for. Those three do more than anything else on this list. Each lever below is tied to a real number in the table above.

  • Get 2–3 quotes from IICRC-certified firms: because Ontario is unlicensed, quotes for the same basement can vary from $2,500 to $10,000+; the spread is the biggest saving opportunity.
  • Use a free visual inspection when mold is clearly visible, and save paid sampling for suspected hidden mould. Restoration Mate prices inspection and testing together at $300 to $800.
  • Handle patches under 1 square metre yourself per Health Canada guidance: detergent and protective equipment cost a fraction of a professional call-out, which Restoration Mate floors at $1,000 for a small bathroom.
  • Fix the moisture source first (a $300–$500 bath-fan reroute): paying $4,000 to clean attic sheathing while the fan still vents into the attic guarantees a repeat bill.
  • Claim the City of Toronto Basement Flooding Protection Subsidy (up to $6,650 from May 1, 2026) for backwater valve and sump pump work that prevents the next mold-triggering flood.
  • If a covered water loss caused the mold, file promptly: insurers deny claims where moisture sat unreported; document with photos and keep receipts against your policy's $10K–$25K mould sub-limit.
  • Keep remediation and rebuild as separate contracts: restoration firms often mark up drywall/paint; a $2–$6/sq ft drywall contractor after clearance testing is usually cheaper.
  • Pay for third-party clearance testing ($200 to $400, The Mold Guy): it is cheap insurance against paying twice for a failed remediation, and gives you paper for resale disclosure.

How did we research these numbers?

By opening every source and finding the sentence that carries the figure. Every row on this page records the source it came from, the literal sentence in that source, and where that sentence sits in a cached copy of the page; a build gate reopens the cache and re-finds it. A figure whose source could not be read was removed rather than republished, and no number was adjusted to make an attribution true.

  • Every figure in the table above was re-checked in August 2026 against the cached text of the page it is attributed to, and each row now records the source sentence it came from. Where a range was not in its named source it was replaced by that source own published figure, or the row was removed. No number was moved to make an attribution true.
  • Per-square-foot pricing in the GTA is not one range. CPR24 Restoration says Toronto cleanup companies usually charge $4.88 to $5.57 per sq ft for standard removal and $13.93 to $41.80 for full service; Ultimate Mold Crew prices full-service remediation with containment, air filtration and post-removal cleaning at $10 to $30 per sq ft, and attic treatment separately at $3.50 to $4.00 per sq ft of attic floor. The rows are split accordingly rather than averaged.
  • The basement row used to read $1,800 to $14,000 and the notes here admitted it had been widened across three firms. Restoration Mate, the source named on the row, publishes $2,500 to $8,000, and that is now what the row says.
  • The small-bathroom row used to read $700 to $3,000. Restoration Mate publishes $1,000 to $3,000. The $700 was on no readable source.
  • Two rows were deleted outright. A $10 to $30 per sq ft full-service rate was attributed to HomeStars, which answers every non-browser request with a 403 and therefore cannot carry a figure; the same rate is published by Ultimate Mold Crew and the row was re-attributed rather than dropped. A HEPA air-scrubber day rate came from DryingEquipment.ca, now behind a captcha wall, and from C&T Rentals, which is a Winnipeg company whose page publishes no price. That row is gone and no substitute number was inserted.
  • GTA firms genuinely disagree about basement work, and the disagreement is the useful fact: Restoration Mate $2,500 to $8,000, The Mold Guy $5,000 to $10,000+, CPR24 Restoration $2,500 to $7,500 for moderate multi-room problems. Each row carries the figure of the source it names.
  • Mold Busters itemised component costs (containment $300 to $2,500, labour $100 to $200 per hour) are used because Toronto firms rarely publish line items at all.
  • Black mold carries a handling premium: CPR24 Restoration puts it at CAD 1,393 to CAD 6,270, and says serious black mold problems can push costs to CAD 9,754 or higher.
  • US sources were excluded rather than converted, so every figure on this page is a Canadian dollar figure from a Canadian page.
  • Add 13% HST: most GTA contractors quote before tax.
  • Wright Restorations rewrote its cost guide in October 2026 and the page now publishes no prices at all, so every row and note that rested on it was removed rather than left citing a page that no longer carries the figure. That took out three rows here: standard drywall and framing treatment per sq ft, a finished basement with demolition and rebuild, and crawl space work.

Sources

Who can do the work?

The photographs below belong to the mold removal companies this site's published score puts at the top: their own vans, premises and jobs, as published on their own Google listings and read in July 2026. Nothing here was shot for this page.

  • Orange containment sheeting spread across a hardwood kitchen floor, with a broom, a spirit level and a spray bottle laid out beside it
  • A worker in a white protective suit and a full-face respirator crouching between roof trusses in an attic, vacuuming the boards with a canister unit, lit by one clamped work light
  • Two workers in white protective suits kneeling in an attic, bagging loose blown-in insulation from between the trusses under a single work light
  • Two dozen blue air movers and extractors laid out on a driveway beside an open van and a disposal bin, staged before a job
  • A hand holding a thermal imaging camera up to a bedroom wall, the screen showing a cold blue patch spreading across an otherwise warm surface
  • The underside of an attic roof, pale plywood sheathing with the nail points showing through, one rafter darkened, loose insulation on the joists below

6 of the photographs these companies publish themselves, in the order this site's published score puts them: Ultimate Mold Crew - Mold Removal Toronto, Canada's Restoration Services, Canada's Restoration Services, 5 Star Cleaning - Water Remediation, Restoration Professionals, Inch By Inch Inspections.

2 higher-placed companies were passed over here because the lead photograph is marketing creative, a before-and-after composite or a posed booth shot rather than a picture of a job. They are still in the list below and on the full mold removal page.

RestorationIndex tracks 200 mold removal companies across the Greater Toronto Area, rated 4.81★ on average. The three below rank highest on our published score, based on RestorationIndex's analysis of 200 GTA businesses, July 2026.

See all 200 mold removal companies on RestorationIndex

What do the terms in a mold removal quote mean?

These are the 7 words the quotes above are written in, defined from what this page's own sources say about them. Knowing them is most of the difference between comparing two bids and guessing between them, and each one has its own link so a definition can be pointed at on its own.

Remediation
Removing mould and the material it is growing on, then cleaning what is left, under conditions that stop spores travelling. It ends at clean bare studs: putting drywall, insulation and trim back is a separate rebuild contract, which is why two quotes for the same job can look thousands apart.
Containment
Sealing the work zone with poly walls and a zippered entry, and running a negative-air machine so the pressure inside is lower than the rest of the house. It is a different job rather than an upgrade, which is why the per-square-foot rate roughly triples once it is in.
Clearance testing
An air or surface sample taken after the work by somebody who did not do the work, checked against an outdoor control, to show the spore count came back to normal. Ontario licenses neither testing nor remediation, so an independent clearance test is the only paper that says the job finished.
IICRC S520
The trade standard for mould remediation. Adopting it is voluntary in Ontario, because the province licenses neither mould remediation nor mould inspection, so certification is a signal rather than a requirement.
Moisture source
The leak, the condensation or the misrouted exhaust fan feeding the growth. Remediation removes what is there and does nothing to stop it returning, so the moisture repair is priced separately and a job that skips it buys a repeat bill. A bathroom fan still venting into the attic while the sheathing above it is cleaned is the case this page's own sources use.
AMRT and the S520 standard
The IICRC's mould remediation standard and the technician designation built on it, Applied Microbial Remediation Technician. Ontario licenses neither, so both are voluntary, and they are the paperwork to ask for alongside liability insurance and WSIB coverage. Anyone in this province can legally market themselves as a mould expert.
Mould sub-limit
A cap an Ontario insurer puts on the mould part of a claim, set separately from and lower than the limit on the water damage that caused it. Everything above the sub-limit plus the deductible is out of pocket, which makes it the line to read first on a covered loss.

What should I ask a mold removal contractor before signing?

  • Are your remediators IICRC certified (S520), and can you show current certificates?
  • How will you contain the work area and protect the rest of the house from spores?
  • Will you fix the moisture source, or only remove the visible mold?
  • Do you arrange independent clearance testing, or verify your own work?
  • What is included for disposal of contaminated materials and HEPA cleaning? Price your own job with the mold removal cost

What else do people ask about mold removal costs?

How much does mold remediation cost in Toronto in 2026?

Restoration Mate says most homeowners pay $2,500 to $8,000 for professional mold removal, and prices a standard-scope basement job in exactly that band. Small surface jobs start around $500 to $1,500, while whole-home or large hidden infestations run $10,000 to $30,000+ per The Mold Guy. Add 13% HST, since most contractors quote before tax.

What does mold removal cost per square foot in Toronto?

Ultimate Mold Crew prices standard attic mold treatment at $3.50 to $4.00 per square foot of attic floor in Toronto. Full-service remediation with containment, air filtration and post-removal cleaning is a different product at a different price: Ultimate Mold Crew says Toronto companies often charge $10 to $30 per square foot for it.

How much does it cost to remove mold from a small bathroom?

Restoration Mate prices a small bathroom mold removal package at $1,000 to $3,000. Surface mold on tile grout or a ceiling patch sits at the low end. Mold inside the vanity wall or behind the tub surround needs demolition and containment on top. Upgrading the exhaust fan to stop it coming back is quoted separately.

What does attic mold removal cost in Toronto?

Ultimate Mold Crew prices standard attic mold treatment at $3.50–$4.00 per square foot of attic floor, so a 1,000 sq ft attic runs $3,500–$4,000, and lists bathroom exhaust fans venting into the attic among the common causes. Contaminated insulation removal, ventilation correction, exhaust fan rerouting and sheathing replacement are extra work on top of that rate.

Will home insurance cover mold remediation in Ontario?

Only if the mold came from a sudden, accidental insured event: a burst pipe, or flooding covered by optional sewer-backup or overland-water endorsements. Mold from chronic seepage or a long-ignored leak is denied. Many Ontario policies also cap mould remediation with sub-limits of $10,000–$25,000, so you pay anything above that plus your deductible.

Can I remove mold myself instead of hiring a company?

Health Canada says small patches, one square metre or less, can be cleaned yourself with gloves, a mask and detergent. Any single patch over three square metres (about 32 sq ft), recurring mold, or suspected hidden growth needs a qualified professional. This page used to quote a GTA rental rate for a HEPA air scrubber and no longer does: one rental source now blocks checking and the other turned out to be a Winnipeg company.

Is post-remediation clearance testing worth the money?

Yes. It is the only independent proof the remediation worked. The Mold Guy prices post-remediation clearance testing at $200 to $400 and Restoration Mate at $200 to $500. It compares indoor air spore counts against an outdoor baseline after cleanup. Because Ontario has no licensing for mold remediators, insist the clearance test is done by a different company than the one that did the removal.

Why do mold removal quotes in Toronto vary so much?

The industry is unregulated in Ontario, so scope and standards differ between firms: one quotes a $1,500 surface treatment while another quotes a $7,500 full containment protocol for the same basement. Access, finished surfaces, containment level, testing and rebuild drive the spread. Get 2–3 quotes from IICRC-certified firms and compare line items, not totals.

What else should I read before booking mold removal?

A price only answers half the question. These are the other RestorationIndex guides that bear on the same decision, each with its own sourced table.

Who handles mold removal in the GTA?

Every company on the list below its own page shows its hours, its area and a quote request.

See mold removal