Authored by: Rimkus Built Environment Solutions Marketing Team
Ontario does not impose a single province-wide recurring structural-inspection interval for all existing parking garages. In the absence of a specific municipal, insurer, lender, or property-specific requirement, owners should establish a risk-based assessment program with a structural engineer.
The appropriate timing depends on the garage’s age, chloride exposure, freeze-thaw conditions, water-management performance, construction type, prior repairs, and findings from earlier inspections. Condominium reserve fund studies operate on a separate legislated cycle and do not replace an engineering condition assessment when structural deterioration is suspected.
The stakes of deferring that assessment are already playing out in Ontario. City of Ottawa staff reported in February 2026 that the 50-year-old parking garage at 70 Clarence Street has gone from “fair to poor” condition in recent years, with “advancing deterioration across multiple structural systems.” Addressing the structural, mechanical, and life-safety deficiencies well enough to keep the garage open past 2028 would cost the city an additional $29.5 million.
The sections below cover what drives that kind of deterioration, how a structural assessment is actually conducted, and how Ontario’s patchwork of municipal and condominium requirements applies to a given building.
Key takeaway: parking garage structural assessments in Ontario
Condominium boards and property managers assessing garage condition should confirm applicable municipal, insurer, and condominium obligations, then build a risk-based schedule around the garage’s age and salt exposure.
What to review first
- Prior engineering reports, repair drawings, reserve fund studies, leak history, and maintenance records, since the last report’s findings typically shape the next assessment interval
- Whether any municipal property-standards program, rental-housing bylaw, insurer requirement, or existing order applies to the property
- Whether the garage shows signs that warrant engineer involvement, such as active corrosion, recurring leakage, or failed waterproofing
How to build the schedule
- Pair routine visual observations with periodic engineer-led structural condition assessments at intervals informed by exposure and prior findings
- Treat the condominium reserve fund study as a financial-planning tool, not a substitute for a structural assessment
- Retain a structural engineer when deterioration is suspected or when repair decisions fall outside the reserve-study provider’s scope
For guidance on parking garage structural assessments in Ontario, contact us.
Ontario has no universal reinspection cycle, and reserve fund studies are a separate obligation
Ontario’s Building Code Act obliges owners to keep buildings maintained and repaired, and the Ontario Building Code references Canadian Standards Association (CSA) S413:21, Parking Structures, for the design of new parking structures. CSA S413:21 superseded the previous CSA S413-14 (R2019) edition and addresses durability-related design, construction, and maintenance considerations for parking structures and related vehicular-traffic areas.
The Code’s reference to that standard governs design and construction work within its regulatory scope. It does not create a province-wide recurring assessment cycle for garages already in service.
Condominium corporations carry one related but distinct legislated obligation. Ontario’s Condominium Act requires periodic reserve fund studies, and Ontario Regulation 48/01, made under the Act, sets the three-class study structure and the three-year update cycle. The update generally alternates between a Class 3 study without a site inspection and a Class 2 study with one.
A site inspection therefore recurs at least every six years under that cycle. This site inspection is a component of a financial-planning document, not a structural condition assessment designed to evaluate active deterioration.
Reserve fund studies are primarily financial-planning tools. For complex garages, including those with elevated concrete floors or post-tensioned slabs, a board should consider retaining a structural engineer separately.
This separate engagement can evaluate competing repair strategies, sequencing, and structural risk, particularly where the reserve-study provider’s scope does not cover that analysis.
Salt exposure and freeze-thaw cycling drive most Ontario garage deterioration
In many enclosed Ontario parking garages, chloride-laden meltwater tracked in by vehicles is a major source of exposure. The relative importance of airborne salt, runoff, and interior humidity varies by location, ventilation, and garage design.
Salt dissolved in that meltwater can soak through the concrete to the embedded reinforcing steel, which rusts where moisture and oxygen reach it. Corrosion products can occupy substantially more volume than the original steel, creating tensile stresses that may crack the concrete cover and contribute to delamination or spalling.
A National Research Council of Canada (NRC) field survey of parking structures found no relation between the extent of concrete delamination and either surface cracking or compressive strength.
When sufficiently saturated concrete undergoes repeated freeze-thaw cycles, internal pressure can damage the cement paste and create additional pathways for water and chloride ingress. Properly air-entrained concrete resists this damage far better than concrete without an adequate air-void system. The NRC field survey found that the well-performing garages in its sample were properly air-entrained, while several deteriorated garages were not.
What a structural condition assessment includes
As a risk-based approach to parking garage assessments, Rimkus may recommend an annual visual inspection paired with a detailed assessment roughly every three to five years, adjusted for age and condition. Active corrosion, membrane failure, or expanding delamination may justify an earlier reassessment. This interval reflects Rimkus’s own risk-based recommendation rather than a statutory Ontario requirement or a single universal engineering standard.
Annual visual inspections and detailed structural condition assessments serve different purposes. The annual inspection looks for observable changes such as cracking or spalling, rust staining, leaks, membrane damage, drainage problems, and standing water.
A detailed assessment adds nondestructive testing that can identify hidden conditions the visual inspection cannot. Chain dragging is a qualitative sounding method: delaminated concrete often produces a hollow or dull response compared with sound concrete. Results should be interpreted alongside the slab construction and surface condition. Ground-penetrating radar can help locate reinforcement and estimate cover depth where access and material conditions allow.
Half-cell potential and concrete-resistivity testing can help assess the probability of corrosion activity. Neither test by itself establishes corrosion rate or remaining structural capacity.
Chloride-profile testing can quantify chloride concentration at successive depths and help assess whether chlorides have reached reinforcement depth. Cores drilled from the slab may be tested for compressive strength and can also support chloride or petrographic analysis. Core locations require care, particularly in post-tensioned slabs where a tendon could be struck.
Individual test methods are rarely conclusive on their own, so an assessment typically combines methods based on the garage’s age, construction type, prior reports, and risk factors.
How deferred assessments may affect repair costs and safety risk
Corrosion found late in a parking garage tends to cost more to fix, a pattern consistent with the broader effects of deferred maintenance on building components generally. Repair methods such as patch-and-waterproofing are typically far more effective, and far less costly, when applied before chloride levels reach the reinforcing steel than after active corrosion has already set in.
Waiting until conditions become intolerable tends to lead to more extensive rehabilitation and less satisfactory results. Earlier identification of water ingress, chloride contamination, and delamination can preserve more repair options and reduce the extent of later rehabilitation.
Beyond higher repair costs, prolonged water and salt exposure can also contribute to serious structural safety consequences. The Algo Centre Mall in Elliot Lake, Ontario, partially collapsed in June 2012, resulting in 2 fatalities and 19 injuries. The public inquiry into the collapse identified long-term water and chloride exposure as a central cause.
It also pointed to an unsuitable and untested waterproofing design installed on the rooftop parking deck, along with serious deficiencies in inspection, maintenance, and regulatory oversight, as contributing factors. These deficiencies persisted despite roughly 30 inspections and reports documented over the building’s history.
Municipal programs may cover some, but not all, garages
Municipal rules for parking garages vary across Ontario. Some municipal programs evaluate common areas, including underground parking, as part of a broader property-standards or rental-housing review rather than a dedicated structural garage-assessment regime.
Hamilton’s Safe Apartment Buildings Program, for example, requires recurring evaluations for eligible rental apartment buildings, and common areas covered can include underground parking. The program generally excludes condominiums.
Certain condominium rental properties are covered, however. A condominium building may need to register if all of its units are owned by the same person or related persons and it otherwise meets the program’s rental and building-size criteria.
A condominium or commercial garage may not be covered by Hamilton’s program. Owners should still confirm whether another municipal requirement, building order, or property-specific obligation applies to their building.
Planning garage assessments around Ontario’s salt exposure
For boards and property managers weighing when to assess an aging garage, particularly one with years of exposure to chloride-laden meltwater and freeze-thaw cycling, a structural engineer can help define the assessment scope and timing. That guidance can also help account for the work in the capital plan alongside the separate reserve fund study timeline.
To discuss a parking garage structural condition assessment with the Rimkus Built Environment team, contact us.
Frequently asked questions about parking garage assessments in Ontario
What do garage assessments and repairs typically cost?
Parking garage structural assessment and repair costs vary with the scope of work and the deterioration found, so there is no single typical figure. Property managers commonly use reserve fund models and budget a contingency for hidden deterioration discovered during testing.
What should happen if an assessment identifies an immediate structural hazard?
If a parking garage structural condition assessment identifies an immediate hazard, the engineer may recommend access restrictions, shoring, or temporary closure, and owners should promptly consult the authority having jurisdiction where required. Additional steps can include securing utilities and documenting conditions photographically to support prioritization of repairs.
Does a structural condition assessment also cover accessibility and code compliance?
A parking garage structural condition assessment does not automatically include an accessibility, fire and life-safety, or building-code compliance review; those reviews should be scoped separately with appropriately qualified professionals. A structural assessment may identify issues that warrant one of those additional reviews without itself serving as a substitute for it.
This article is intended to provide general information and insights into prevailing industry practices. It is not intended to constitute, and should not be relied upon as, legal, technical, or professional advice. The content does not replace consultation with a qualified expert or professional regarding the specific facts and circumstances of any particular matter.