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Grow-op Impact Assessment

  • Performed by a Professional Engineer
  • Complies to Order to Remedy an Unsafe Building
  • Includes Structural and Mould Impact Assessments

Environmental Impact Assessment Due to Marijuana Grow Operations

Ben Engineering provides environmental and structural impact assessments of damage caused by indoor marijuana grow operations. This type of assessment is commonly required by cities' and local municipalities' building departments. It is also known as Order to Remedy an Unsafe Building, and it basically revokes the occupancy permit due to a marijuana grow-op until remediation is completed and the property is safe for use. You may also be required to provide such assessments to satisfy other regulatory bodies, insurance companies, or lenders throughout Ontario.

Damage to a building due to a marijuana grow-op is typically associated with excessive mould due to extensive, long-term exposure to high humidity levels, light, and high temperatures. A grow operation can also affect a building's structural components by exposing them to humidity or altering them to create conditions necessary for plant cultivation. Some building systems - in particular, the electrical and ventilation systems - can also be affected by exposure to such an environment and over-use during a marijuana grow operation.

The purpose of the Marijuana Grow-op Assessment is to determine if the mould spores and other types of contamination exceed the guideline levels and thus can cause health issues and to investigate whether changes made to the building, in particular to the structural and electrical components, endanger its structural integrity or constitute a hazard.

The assessment for a building that housed a marijuana grow-op includes the following major items:

  • Visual inspection of the readily accessible interior and exterior elements to assess the extent of damage and visible signs of mould.
  • Destructive testing of concealed building elements such as removing carpeting or flooring and cutting holes in walls/ceilings and ventilation ducts to inspect the insulation materials and to detect signs of hidden mould.
  • Air quality testing to determine the concentration of different types of bacteria and other hazardous biological and chemical substances associated with fungal (commonly mould) and health issues.
  • Inspection of the structural components of the building that may have been affected by the humidity or by changes made to the structure to accommodate the marijuana grow-op to determine if there are any damages that have compromised its structural integrity.
  • Recommendations for remedies in order to restore the property to safe use and to comply with the guidelines and other legal requirements.
  • A full written report, which includes a description of the property and the affected areas, the findings, laboratory results, photograph documentation, and recommendations for remediation. Post-remediation work assessment may be required, depending on the extent of damage of the preliminary findings.
  • All inspections and reports performed by a Professional Engineer.

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Service Area

Our services are provided across Ontario, mainly in southern Ontario within a traveling distance of up to 500 kilometres from Greater Toronto Area, between Windsor, Niagara Falls, Ottawa, and Sudbury.


Our rates are competitive. We prefer to avoid charging an hourly rate and prefer to charge a flat fee per service, which includes travel, dispensements and other expenses, as we are aware that customers normally do not like it.

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