# Radon Mitigation System Cost Toronto: Real 2026 Pricing

A test result above 200 Bq/m3 lands in your inbox and the first question is always the same: what is this going to cost to fix? The good news is that radon mitigation is among the cheapest meaningful health upgrades you can do to a home. Most Toronto mitigations land between $2,200 and $5,000 all-in, with reductions of 80-99% routinely achieved on the first system. Below is the honest 2026 price breakdown from C-NRPP-certified contractors RenoHouse coordinates with across the GTA.

The Default System: Single-Point Sub-Slab Depressurization

About 90% of Toronto residential mitigations use sub-slab depressurization (SSD) with a single suction point. The system pulls air from beneath the basement slab through a sealed PVC pipe, runs the pipe up through the home, and exhausts it above the roofline using a continuously running fan.

Standard SSD with interior pipe routing: $2,200-$3,200

What is included at this price:

One core-drilled suction point through the slab, sealed at the slab penetration.
4-inch PVC pipe routed through a closet, mechanical room, or service chase to the attic.
Attic-mounted radon fan (60-200 W draw, 10-15 year lifespan).
Roof penetration with weather flashing, exhaust above the eave per Health Canada protocol.
Manometer pressure gauge installed in the basement on the pipe.
Sealing of major slab cracks and sump-pit lid as a complement.
Workmanship warranty (typically 5 years on the install, 5 years on the fan).
C-NRPP Mitigation Specialist design and oversight.

SSD with exterior pipe routing: $2,500-$3,800

Used when interior routing is impractical (no available chase, finished basement) or aesthetically undesirable. The pipe runs up the outside of the house. Slightly higher cost reflects exterior-grade fittings, weatherproofing, and longer pipe runs.

Multi-Suction-Point Systems

Larger basements, additions over separate slabs, or homes with significant slab-pour seams sometimes need 2-3 suction points to achieve adequate pressure differential.

Multi-point SSD: $3,500-$5,500

Add roughly $700-$1,200 per additional suction point beyond the first. Larger fans (200-300 W) are common in multi-point systems.

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Crawl Space Sub-Membrane Depressurization

Homes with unfinished crawl spaces (parts of Etobicoke and Scarborough postwar bungalow stock especially) cannot use SSD because there is no slab. Instead a sealed vapour barrier is installed across the crawl space soil and depressurized.

Sub-membrane depressurization: $3,000-$5,000

Includes 10-20 mil reinforced poly membrane, mechanical fasteners to walls, sealed seams, suction-point penetration, and fan. Pairs naturally with crawl-space encapsulation if that is on your list.

Block-Wall Depressurization Add-On

Older Toronto homes (typically 1950s-1960s) built with hollow concrete-block foundation walls have an additional radon entry pathway through the block cores. SSD alone may not address this.

Block-wall depressurization add-on: $800-$1,500 in addition to SSD. A second suction point is installed into the block-wall void, often tied into the same fan if capacity allows.

What Is Not Included in the Base Price

Items that may bump the budget:

Dedicated 15A electrical circuit for the fan, if not already present: $300-$600 (licensed electrician, ESA inspection where required).
Fan upgrade for high-suction situations: $150-$300.
Soffit or chase carpentry to enclose the pipe in a finished basement after the fact: $400-$1,200.
Post-mitigation long-term re-test: $250-$400 (this is essential — without a verified post-test you have a fan running but no proof of effectiveness).
Permit fees where municipalities require them: $50-$200.

A realistic all-in budget for a typical Toronto detached or semi-detached home is $2,500-$5,000 from quote to verified mitigation, with most landing in the $2,800-$3,800 range. Compare this to the $40,000+ you might spend on a deep basement renovation or the $30,000+ for an HVAC overhaul, and radon mitigation is the highest health-ROI dollar in residential renovation.

What Drives the Variance

Five factors explain the spread between the $2,200 and $5,500 ends of the range:

1. Number of suction points required. Set by basement geometry, slab integrity, and pre-mitigation diagnostic suction tests.
2. Pipe routing. Interior straight-shot from basement to attic is cheapest. Exterior routing or interior routing through finished spaces is more expensive.
3. Foundation construction. Hollow block walls add cost. Slab-on-grade single-pour basements are simpler.
4. Fan size. 60-90 W consumer fans for typical homes; 150-300 W for larger or harder-to-treat homes.
5. C-NRPP firm reputation and warranty terms. A 10-year fan warranty from a larger firm costs more than a 5-year warranty from a smaller specialist; both can be appropriate.

Operating Costs After Install

The radon fan runs continuously. Operating cost in 2026 Toronto Hydro pricing:

60 W fan: roughly $7-$10/month at average rates.
90 W fan: roughly $11-$15/month.
200 W fan: roughly $24-$32/month.

Most Toronto homes run 60-90 W fans, so realistic operating cost is $120-$180/year. Fan replacement at end of life: $300-$600 plus a service call.

Hidden Savings to Look For

Three places homeowners legitimately save without compromising the install:

1. Pre-existing sump pit. If your basement has a sealed sump pit, the mitigation specialist can sometimes use it as the suction point, eliminating the slab core hole and reducing labour.
2. Combined with basement renovation. If you are already doing basement work, the radon rough-in can be included with minimal incremental cost. See [Radon During Basement Finishing in Toronto](/blog/radon-during-basement-finishing-toronto).
3. Combined with underpinning. A basement underpinning project re-pours the slab from scratch — the moment to add a future-proof radon rough-in. See [Basement Underpinning Toronto: 2026 Complete Guide](/blog/basement-underpinning-toronto-2026-complete-guide).

Where the Money Should NOT Go

Three things you should NOT pay extra for:

1. HRV/ERV-only "mitigation" pitches. A standalone HRV is rarely sufficient to bring a 400+ Bq/m3 home below 200. It can complement SSD; it should not replace it. See [Radon Resealing Cracks vs Active Mitigation](/blog/radon-resealing-cracks-vs-active-mitigation).
2. "Whole-house air purifier" packages bundled into a radon proposal. Air purifiers do not address radon. Radon is a gas; HEPA filters do not capture gases.
3. Premium-tier fans for homes that do not need them. Most Toronto homes do not need a 200 W fan.

How RenoHouse Coordinates the Cost

RenoHouse is a renovation contractor, not a stand-alone radon mitigation firm. We coordinate C-NRPP-certified mitigation specialists — Pinchin, EHS Partnerships, Radonova among others — and where the work coincides with a basement renovation we sequence everything on a single timeline. That means the radon pipe is roughed in before drywall, the manometer location is pre-planned, and the post-mitigation re-test is scheduled into the project timeline. For the certification context, see [Hiring a C-NRPP-Certified Radon Professional](/blog/c-nrpp-certified-professional-toronto).