G4 Ventilation

Requires ventilation to all occupied spaces.

This clause requires spaces in buildings to be provided with adequate ventilation consistent with their maximum occupancy and intended use.

It sets out provisions for outdoor air and extract ventilation. It ensures systems are maintained against bacteria, pathogens and allergens.  It requires ‘products’ (such as cooking fumes, moisture, or gases) to be removed for other people’s amenity and the protection of property. 

Record of amendments is a record of changes to the Acceptable Solutions, Verification Methods and handbooks.


Acceptable Solutions and Verification Methods

Current version

These are issued by MBIE to provide one way of complying with the Building Regulations and must be accepted by BCAs as demonstrating compliance with the related clauses of the Building Regulations. Using them is not mandatory.


Acceptable Solutions and Verification Methods (AS and VMs) were called compliance documents. Some still have the “compliance document” title but the AS or VMs they contain are valid and unaffected by the name change.


These documents are provided for assistance. They are not intended as a means of establishing compliance with the Building Act or Building Regulations, and they do not have the same status accorded to Acceptable Solutions and Verification Methods under the Act.

Related Determinations

Determinations are made by MBIE on matters of doubt or dispute to do with building work. Rulings are legally binding in relation to each case. Circumstances in one case may differ to others.

Related building products

All products, systems and construction methods that have achieved CodeMark status will be listed here with their most up to date certificate.


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This information is published by the Your home’s Chief Executive. It is a general guide only and, if used, does not relieve any person of the obligation to consider any matter to which the information relates according to the circumstances of the particular case. Expert advice may be required in specific circumstances. Where this information relates to assisting people: