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AS4055 Site Wind Classification Certificate
 

Need an AS4055 wind classification for a house, townhouse, granny flat, garage, carport, shed, awning or detached backyard studio? Complete the order form below for a fixed-fee AS4055 Site Wind Classification Certificate for eligible Class 1 or 10a residential projects, issued by email within 1 business day.

 

For builders, certifiers, designers, suppliers and manufacturers who need a fast, project-specific wind classification.

 

  • Fixed fee: $244.50 plus GST

  • Prepared by fully compliant and insured structural engineers

  • Currently available in NSW, QLD, SA and WA only

  • Useful for a range of building components, including windows, doors, roof trusses, cladding and garage doors, as well as project documentation.

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Brief explanations:

  • Class 1 building is a dwelling that is not located above or below another dwelling, or another class of building other than a private garage. 

  • Class 10a is a non-habitable building including a private garage, carport, shed or the like. 

  • AS4055 building geometric limits; 8.5m max height, 6m max eave height, 16m max width, length no more than 5 times width, 35° max roof pitch.

  • See below for more information (after the order form below).

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Outside the scope of AS4055 site wind classification? Email your proposed project details to mail@webeta.com.au and we will provide a fee proposal for your requested work.


Certificate Order Form
 

Currently available in NSW, QLD , SA and WA only

State

May be obtained from Google Maps. On mobile, long-press the site. On desktop, right-click the site.

Project Description
Fixed-Fee

Price excludes GST. Certificate will be issued by email within 1 business day.


More Information
 

​​​This certificate provides a site wind classification for housing in accordance with AS4055 Wind Loads for Housing. It identifies the applicable site wind classification for the nominated site for use within the scope of the standard.

The certificate is intended to provide a clear project-specific basis for design, specification, product selection and project coordination where an AS4055 site wind classification is required.

It may be used by homeowners, builders, designers, certifiers, suppliers and manufacturers where a site wind classification is needed for housing components or related project documentation.

This certificate may be used to inform the design, specification or selection of:

  • Structural framing and associated housing elements

  • Roof cladding and wall cladding

  • Roof trusses and tie-down requirements

  • Windows and glazed doors

  • External doors, including garage doors

  • Other housing components designed or selected using an AS4055 site wind classification


It may also be used to support design coordination, documentation, procurement and approval-related processes where an AS4055 site wind classification is required.

For this service, housing is limited to eligible NCC Class 1 and Class 10a buildings within the geometric limits of AS4055.

This certificate does not verify NCC building classification or building geometry.

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NCC Class 1 and Class 10 Building Class Extracts 
 

Class 1 buildings: 
(1) A Class 1 building is a dwelling. 
(2) Class 1 includes the following sub-classifications: 
     (a) Class 1a is one or more buildings, which together form a single dwelling including the following: 
          (i) A detached house. 
          (ii) One of a group of two or more attached dwellings, each being a building, separated by a fire resisting wall, including a row house, terrace house, town house or villa unit. 
     (b) Class 1b is one or more buildings which together constitute — 
          (i) a boarding house, guest house, hostel or the like that — 
               (A) would ordinarily accommodate not more than 12 people; and 
               (B) have a total area of all floors not more than 300 m² (measured over the enclosing walls of the building or buildings); or 
          (ii) four or more single dwellings located on one allotment and used for short-term holiday accommodation. 
(3) Limitations: A Class 1 building cannot be located above or below another dwelling or another class of building, other than a private garage. 
 

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Class 10 buildings and structures: 
(1) A Class 10 building is a non-habitable building or structure. 
(2) Class 10 includes the following sub-classifications: 
     (a) Class 10a is a non-habitable building including a private garage, carport, shed or the like. 
     (b) Class 10b is a structure that is a fence, mast, antenna, retaining wall or free-standing wall or swimming pool or the like. 
     (c) Class 10c is a private bushfire shelter. 
 


Geometric Limits of AS4055
 

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Averaged ground level: Natural ground level excluding earthworks where earthworks are minor, or averaged ground level through modified land where the earthworks are major. 
Note 1 to entry: Where minor earthworks have changed the level of the land over less than 50 m², see lower cross-section in (a). 
Note 2 to entry: Where major earthworks have changed the level of the land over more than 50 m², see upper right cross-section in Figure (a). 
 

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