What should I expect to pay for removing old asbestos-containing parging and replacing it safely?

Removing and replacing asbestos-containing parging on a GTA home typically costs $8,000 to $25,000 or more, depending on the size of the foundation, the extent of asbestos-containing material, accessibility, and whether the project includes exterior excavation. This is significantly more expensive than standard re-parging because Ontario law requires licensed asbestos abatement professionals to handle the removal, and the material must be disposed of at approved facilities.

The cost breaks down into two distinct phases. The first is asbestos abatement, which includes containment setup, safe removal of the old parging, air monitoring, and proper disposal at a licensed facility. For a typical GTA home with 150 to 250 square feet of foundation parging, abatement alone runs $5,000 to $15,000. The price depends heavily on how much material needs to be removed, whether the work is interior or exterior, and whether excavation is required to access below-grade sections. Abatement contractors must follow Ontario Regulation 278/05 under the Occupational Health and Safety Act, which governs asbestos removal procedures, worker protection, and disposal requirements. Air monitoring during and after removal adds $500 to $1,500 to the project cost but is essential for confirming the work area is safe.

The second phase is the replacement parging itself. Once the abatement is complete and the foundation surface is clean and sound, a masonry contractor applies new parging using modern polymer-modified materials. For a typical GTA home, this portion costs $2,500 to $6,000 including surface preparation, bonding agent application, and two-coat polymer-modified parging. If the abatement reveals underlying foundation damage — cracks, deteriorated block, or failed waterproofing — those repairs add to the total. Many homeowners choose to add exterior waterproofing membrane and dimpled board while the foundation is exposed, which adds $3,000 to $12,000 but addresses the root cause of moisture problems.

Asbestos-containing parging is most commonly found on homes built between the 1940s and early 1980s across older GTA neighbourhoods in Scarborough, North York, Etobicoke, and established Mississauga. If your home was built during this period and the parging looks original, have it tested before any renovation work disturbs it. Testing costs $50 to $150 per sample through a certified laboratory. Never attempt to remove, grind, sand, or chip away parging that may contain asbestos — disturbing it releases microscopic fibres that cause serious health problems including mesothelioma.

When planning this project, get at least three quotes from licensed abatement contractors who carry WSIB coverage and proper liability insurance. The abatement contractor and the parging contractor are typically separate trades, though some masonry companies have abatement-qualified crews. Schedule the work during the GTA's safe parging window — mid-April through mid-October — so the new parging has proper curing conditions above 5 degrees Celsius for at least seven days after application. Budget an additional 15 to 20 percent contingency for unexpected conditions behind the old parging. Toronto Parging can help match you with qualified masonry contractors for the re-parging phase of your project through the Toronto Construction Network.