Australian Mould Remediation Standards & Compliance Guide

Standards help define how mould-affected buildings and contents are assessed, cleaned and restored. This guide explains the main references and the questions to ask before work starts.

Call 1300 114 842 for advice about an ARS assessment. The initial phone consultation is free. Onsite inspections, testing and reports may involve quoted fees.

Australia Has a Mould Remediation Standard

AS-IICRC S520:2025 is the Australian Standard for Professional Mould Remediation. It adopts ANSI/IICRC S520:2024 with Australian modifications. Its scope covers procedures and precautions for mould remediation in residential, commercial and institutional buildings, including systems and contents.

See the AS-IICRC S520:2025 catalogue listing. Contractors should use the full current standard and applicable Australian modifications when defining and carrying out work. This guide is a general overview, not a substitute for the standard.

Other References May Apply

  • AS-IICRC S500:2025: the Australian water damage restoration standard, relevant to water-affected buildings and contents.
  • National Construction Code (NCC): building provisions may be relevant to repairs, ventilation and moisture management. The applicable edition and requirements depend on the work and jurisdiction.
  • Workplace safety requirements: assess site hazards, worker protection, access and controls for the planned work.
  • Project requirements: confirm insurer, contract, building-management and reporting needs before work starts.

Read the IICRC announcement of AS-IICRC S500:2025 and the Victorian building guidance on condensation and mould.

Standards and Legal Compliance Are Different

Standards are generally voluntary documents. A law or regulation can make a particular standard mandatory, and a contract can also require its use. Standards Australia explains this in What is a Standard?

A reference to S520 does not by itself certify a building or prove that every legal duty has been met. Agree on the standard, edition, work scope and evidence required. Obtain project-specific advice from the relevant regulator or qualified adviser where needed.

What a Clear Remediation Plan Should Explain

Assessment and Moisture Sources

Record accessible mould, affected materials, water history and moisture readings. Explain any hidden areas that need further access. Identify repairs or specialist checks needed to address the moisture source.

Containment and HEPA Filtration

Select barriers, access controls and HEPA-filtered equipment to suit the work. These controls help limit the spread of dust and mould during removal and cleaning. Their condition needs checking during the job.

Cleaning and Material Removal

Explain which surfaces can be cleaned and which materials may need controlled removal. Consider the material, damage and access. Agree on contents protection and waste handling before work starts.

Drying and Monitoring

Where needed, dehumidifiers and air movers help dry wet building materials. Moisture readings track progress and guide equipment changes. The water source also needs attention.

Review and Verification

Set completion criteria before work begins. Review cleaned areas, material condition, remaining debris or odours, moisture targets and the agreed scope. Where independent verification is required, arrange a qualified third party. Agree separately on any testing and its limits.

Why Mould Can Return After Cleaning

Cleaning may leave the moisture source unresolved. Common contributors include:

  • Hidden plumbing or roof leaks
  • Condensation and poor airflow
  • Damp subfloors
  • Waterproofing or drainage faults
  • Materials that remained wet after a leak or flood

The response should match the findings. Small surface growth may need a different approach from mould inside wet plasterboard or after a long-term leak.

Questions to Ask Before Booking

  • Which standard and edition will guide the work?
  • What areas and materials are included or excluded?
  • Who will investigate and repair the moisture source?
  • What access restrictions or occupant arrangements are needed?
  • How will drying and completion be checked?
  • Are testing, reporting and independent verification included in the quote?

Related Services

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Frequently Asked Questions

Is there an Australian mould remediation standard?

Yes. AS-IICRC S520:2025 is the Australian Standard for Professional Mould Remediation. It adopts ANSI/IICRC S520:2024 with Australian modifications.

Are remediation standards automatically law?

No. Standards are generally voluntary on their own. A law, regulation or contract may require a particular standard. Check what applies to the project and jurisdiction.

Why is moisture control important?

Mould can return while materials remain damp. The work plan should address leaks, drying and airflow as well as cleaning or removal.

What is HEPA filtration?

HEPA filters capture fine airborne particles, including mould spores. Filtered equipment can support dust control during suitable work, alongside containment and cleaning.

Do all mould problems require professional remediation?

Not always. Some small surface patches may be manageable with suitable care and moisture control. Widespread, recurring or hidden mould needs further assessment.

Who should perform independent post-remediation verification?

Where independent verification is required, use an appropriately qualified assessor who is separate from the remediation contractor. Agree on the criteria and any sampling before work begins.

Discuss Mould Remediation With ARS

Absolute Restoration Service provides mould assessment, moisture investigation and remediation across Melbourne. We explain the proposed work, access needs and reporting scope before proceeding.

  • IICRC-certified mould remediation technicians
  • Moisture investigation and practical recommendations
  • Residential, commercial and strata experience
  • Clear work records and agreed completion checks

Call 1300 114 842 for an initial phone consultation. Onsite inspections, testing and reports may involve quoted fees.