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If you suspect mould in your workplace or property, contact us today for compliant regulatory reporting.

Mould assessments

Understanding mould contamination in New Zealand buildings

Mould and bacteria can negatively affect indoor environments and create a range of health concerns. Depending on the species and level of contamination, exposure may lead to allergic reactions, respiratory irritation, asthma flare ups, skin problems or in some cases more serious infections. Certain moulds can produce mycotoxins, and many mould and bacterial spores contain allergens that can trigger symptoms in sensitive individuals. Health effects vary based on the type of organism present, how much growth is occurring, the method of exposure and each person’s susceptibility.

Indoor mould growth is closely linked to excess moisture. Leaks, poor ventilation, condensation and inadequate drainage are common causes in New Zealand homes and commercial buildings. Once moisture is present, mould can spread quickly, including into concealed areas such as wall cavities, under flooring, behind linings or within insulation. Even mould that cannot be seen may still release spores and compromise indoor air quality.

Professional in protective suit inspecting mold on wall in corner of room. Mold remediation, water damage, toxic fungus, home inspection, black mold removal, indoor hazard

FAQs

  • When is a mould assessment required in a building?

    A mould assessment is typically required where there are signs of moisture issues, visible mould growth or occupant health concerns such as respiratory irritation. It is also commonly undertaken when investigating water damage or indoor air quality complaints.

  • What causes mould growth in buildings?

    Mould growth is usually caused by excess moisture, which can result from leaks, condensation, poor ventilation or high humidity levels. Addressing the moisture source is critical to resolving mould issues effectively.

  • How does a mould assessment support effective remediation?

    A proper assessment identifies the source of moisture driving mould growth, not just the visible issue. This ensures remediation is targeted and reduces the risk of mould returning after treatment.

Our mould assessment services

ALS provides a full range of mould investigation services throughout New Zealand. Our assessments are designed to support homeowners, landlords, insurers, property managers and commercial clients.

Inspections and sampling:
  • Visual inspections to document visible mould, water damage and areas with elevated risk
  • Moisture evaluations using moisture meters and thermal imaging to pinpoint hidden dampness
  • Air and surface sampling for accredited laboratory analysis to identify species present and quantify contamination.
Remedial action plans:
  • Investigation of underlying causes, including leaks, building defects, drainage issues or ventilation limitations
  • Development of clear and practical remediation plans that align with recognised guidance and industry practices
  • Recommendations for moisture control, ventilation improvements and safe cleaning or removal techniques.
Post-remediation validation:
  • Verification inspections after remediation work are completed
  • Air or surface sampling to confirm mould has been successfully removed and environmental conditions are suitable for re-occupation
  • Reporting that provides evidence of successful remediation for clients or insurers.

FAQs

  • What is a mould assessment and what does it involve?

    A mould assessment involves inspecting a building to identify the presence, extent and source of mould contamination. This may include visual inspection, moisture assessment and air or surface sampling where required.

  • Why is mould assessment important?

    Mould can impact indoor air quality and pose health risks to occupants, particularly in enclosed environments. Assessment helps identify underlying causes and supports effective remediation.

  • Where is mould commonly found in buildings?

    Mould is commonly found in areas affected by moisture, such as bathrooms, kitchens, ceilings, walls and spaces impacted by leaks or poor ventilation.

  • What happens if mould is identified?

    If mould is identified, the next step is to address the source of moisture and implement appropriate remediation. This may include cleaning, removal of affected materials or improvements to ventilation and moisture control.

  • Can mould return after it has been removed?

    Yes. If the underlying moisture issue is not resolved, mould can return. Effective long-term management requires both remediation and elimination of the moisture source.

 
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