About
New Zealand's Certified Mould Specialist
Our Approach
Healthy Property Limited was founded on a simple observation: mould is consistently misunderstood, consistently mismanaged, and consistently causing preventable harm to the people living and working in affected buildings.
General cleaners and builders do not have the training, the equipment, or the methodology to resolve it. In most cases, their intervention makes it worse.
Our approach is built around four non-negotiable steps.
Test first, using air and surface sampling analysed by an IANZ-accredited laboratory.
Contain properly, before any physical disturbance of contaminated material.
Remediate to standard, using IICRC S520-compliant methodology with full containment and PPE.
And certify independently, with post-remediation clearance testing and a Safe Occupancy certificate signed off by a a certified specialist.
None of these steps can be replaced by cleaning.
All of them are necessary to produce a verified, documented outcome that protects the people inside the building.
Our Story
Healthy Property Limited was built on a clear conviction: that mould in New Zealand buildings is causing serious, preventable harm to the people inside them, and that most of the industry response to it is inadequate.
Adults spend 80 to 90% of their time indoors. The quality of that air directly affects health, performance, and wellbeing. New Zealand has one of the highest asthma rates in the world, and peer-reviewed research has established a direct dose-response relationship between mould in homes and asthma risk. The problem is real, it is measurable, and it is largely invisible without specialist assessment.
We started by testing homes. We now work across residential properties, commercial buildings, government facilities, schools, social housing, maritime vessels, and large institutional portfolios, nationwide across both islands. Our qualifications, our methodology, and our commitment to independently verified outcomes have not changed.
We test, we remediate, we certify. Every time.
Mould, Health Risks and Healthy Homes Compliance
in New Zealand
Mould growth inside buildings is a health, safety and compliance issue. In New Zealand, mould is directly linked to moisture, ventilation and building performance, all of which are addressed under the Healthy Homes Standards.
Understanding mould types, health risks and why specialist remediation is required helps property owners, landlords and businesses meet their legal obligations and protect occupants.
Hidden Mould and Building Cavities
Mould often grows in places that are not immediately visible, including ceiling cavities, wall linings, subfloors and behind fixtures.
Hidden mould can release airborne spores without obvious surface growth. In many cases, visible mould is only a small indicator of a much larger underlying problem.
Professional inspection and testing are often necessary to identify the full extent of contamination.
Healthy Homes Standards and Mould in New Zealand
Under the Healthy Homes Standards, rental properties must meet minimum requirements for:
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Moisture ingress and drainage
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Ventilation
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Heating
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Insulation
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Draught stopping
Excess moisture and persistent mould growth may indicate non-compliance with these standards.
Landlords are required to ensure rental properties are free from conditions that contribute to unhealthy living environments. Mould caused by leaks, inadequate ventilation or poor moisture management may require professional assessment and remediation to meet compliance obligations.
Types of Mould Commonly Found in New Zealand Buildings
High Risk and Toxic Mould
Some mould species, including Stachybotrys chartarum and Aspergillus, are associated with long term moisture issues such as leaks, flooding or chronic condensation.
These moulds can produce mycotoxins that may affect respiratory health, immune function and neurological systems in susceptible individuals. Exposure can occur through inhalation, ingestion or skin contact.
High risk mould contamination requires controlled removal by trained professionals using containment, filtration and safety protocols.
Why Disturbing Mould Can Make the Problem Worse
Mould growth should never be scrubbed, wiped or sprayed without proper controls.
When mould is disturbed, it can release spores and fragments into the air in a process known as sporulation. This increases exposure risks and allows contamination to spread throughout the building.
Activities that commonly cause mould spread include:
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Using bleach or household cleaners
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Dry brushing or wiping mould
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Removing linings or insulation without containment
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Running fans or HVAC systems during uncontained work
Once spores become airborne, they can settle in new locations and create additional mould growth sites.
Workplace and Commercial Obligations
Under the Health and Safety at Work Act 2015, businesses and PCBUs must ensure that workplaces are safe and without risks to health.
This includes managing biological hazards such as mould in:
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Offices
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Retail spaces
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Warehouses
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Schools and childcare centres
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Healthcare and accommodation facilities
Professional mould assessment and remediation help meet these obligations and protect workers, occupants and contractors.
Moderate Risk Mould
Moulds such as Penicillium and Cladosporium are commonly found in homes and workplaces where moisture and ventilation are inadequate.
While generally less toxic, these moulds can still cause allergic reactions, respiratory irritation and ongoing discomfort, particularly for children, older adults and people with asthma or sensitivities.
Moderate risk mould should not be ignored, as it can spread rapidly and contribute to unhealthy indoor environments.
Why Specialist Mould Remediation Is Necessary
Mould remediation is a specialised discipline. It is not standard cleaning or general building work.
Professional mould remediation includes:
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Identification of mould species and contamination extent
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Controlled containment of affected areas
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Use of appropriate personal protective equipment
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Air filtration and environmental controls
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Safe removal of contaminated materials
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Identification and correction of moisture sources
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Post-remediation air quality verification
Without these measures, remediation attempts can worsen contamination and increase health risks for occupants and tradespeople.
Trusted by Homeowners & Businesses
David H
Your work has saved an absolute logistical nightmare for our business, our staff were also very impressed with your swift and thorough work to ensure their safety.
Sarah T
Thank you so much. You’re an absolute legend and I’ll recommend you to anyone and everyone!
Robert, P
Your professional help put our minds at ease, thank you for making our home safe for my wife and newborn son. I've just referred you to another worried family who live a few blocks away.
Qualifications &
Accreditations
