Shed Wind Rating | What Shed Suits Your Region

Shed Wind Rating | What Shed Suits Your Region


When buying a garden shed there are a few things you need to do before you even start shopping for one… things like measuring the available space, deciding on colour and doors, and setting a budget. However, one of the most essential things you need to check, which is commonly overlooked… is what wind rating the area you live in has been assigned.

What is a ‘Wind Rating’?

It’s a rating, which is assigned by your council to a certain area based on the geographic region, shielding, topography, and terrain. Some areas in the country or even your state will experience different levels of winds- some only a small breeze and others cyclones. For example, buying a shed for locations North of Bundaberg Queensland or a high wind area the shed will require a cyclone kit.

Why do I Need to Check My Areas Wind Rating?

Garden sheds can become very dangerous buildings during a windy storm or a cyclone. Even more so than your home at times.

Due to their lightweight, foundation, structure, and material, if they are not built specifically to endure the wind levels in your area then they can be a danger to you. These buildings can be ripped apart in storms if the wrong one has been installed and the pieces can cause damage to their surroundings and even cause death. So it is vital you do your research and purchase the correct shed for your area so you can avoid any of the above.

Australia and New Zealand both unique in their weather because they can experience a vast amount of different climatic conditions in many different parts of the country on the same day. There are states and or local areas that experience high temperatures or seasonal flooding, some of which experience snow and other heavy rain. But what concerns us most in the Shed industry are those areas that experience high winds or cyclones.

By checking the rating of your area and buying a shed that is designed and engineered to withstand heavy winds, you are not only ensuring the lifetime of your shed but also protecting yourself, your family, and others in your area.

How Do I Find Out My Areas ‘Wind Rating’?

Wind Rating - regions

The wind rating of your area is determined by your

  • Geographic region ( Region A,B,C or D)
  • Shielding
  • Topography
  • Terrain conditions

You cannot make an estimate yourself based on past weather events in your area. It is recommended you check with your local council for the legally assigned rating to be safe.

This information that your local council will have, you can easily obtain by giving them a call. You will just need to give them your address to get the info (the address of the property you are planning to build the shed on).

To understand a bit more of what is considered for your wind rating, and also a few things you should keep in mind I have elaborated on the key areas below:


Each state has been allocated its areas of wind ratings, refer to the map above. It’s common knowledge each state has its own weather conditions and exposed to different tides, wind systems, etc so it is natural for the regions to differ too.

The further north of Australia you live, and coastal the more likely you will endure cyclones which means you may fall into Region C or D.


This is looking at your region, suburb almost and considering the type of terrain your home is surrounded by. You can picture a densely vegetated or residents can impact how much wind your home is exposed to.

For example, does your terrain have few or no obstructions. Most often this only exists for isolated houses in flat, tree-less, or poorly vegetated plains with approx 10km of the flat surface surrounding. This is common in regional or outback regions.

You may in a category where you have some trees and objects around your property such as other buildings or homes too.

The more homes and dense your area is with terrain and buildings the less exposed you are to the wind. But you can’t go by this alone. You need to consider the


The topography gets a bit trickier as we are looking at your property’s height, how it slopes and which way it faces.

You may be in a densely developed area but could be on a block still facing and exposed to wind or the opposite/ You may lower down compared to surroundings making you less exposed in general.

Often we have had customers who live in a low-rated region but their home is exposed and can get gusts of heavy winds greater than average impact their terrain.

You can use this information to begin your research for your ideal Garden Shed and make an informed decision.

Cheap Sheds Wind Calculator

Cheap Sheds has also created a Wind Calculator for you to use so you can get a good idea of what your area has been classified as.

<< Click to Access Interactive Calculator>>

How Does it Help Me Choose a Shed?

Wind Rating - choosing your shed

Wind rating is classified with “N” or “C”. N stands for “normal” or “non – cyclonic” while C stands for “cyclonic”. This issue gets a little more complicated as some manufacturers still use the old “W” wind rating classification.

We have prepared a rough comparison table below for illustration purposes, to give you an idea of how the W rating compares to the C and N wind rating.

I hope that you’ll find it useful. We also displayed the Pa rating and the maximum wind speed that a certain classification can withstand to demonstrate it further.

Pa Rating Klm/hrN Value W value Water rating Ultimate

If you have any comments or questions about this topic please do not hesitate to leave them below and we’ll address them as soon as possible.

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  • Les Mosley says:

    Hello There,
    just for you own benifit
    N and C ratings are no longer comparable as per AS4055 in cyclonic regions, your figures are correct for “N” ratings but regions C & D require higher ULS
    Uls for regions C & D are
    C1 2030
    C2 3010
    C3 4440
    C4 5990
    and if the window or door is within 1200mm of a corner in these areas the ratings change again, I suggest you get a copy of AS4055 for Regions C & D requirements
    W ratings no longer exist

    • Krisztian says:

      Thanks for the comment and update Les.
      We only talk about the W rating (still) as some manufacturers still use that and we get a lot of questions about it.

      We’ll have a look into the AS4055 for Regions C & D and update this post accordingly when we get to it.

      All of our buildings are being tested and certified according to regulations, it is just a metter of getting the information out to the public here on the Cheap Sheds Blog.

      Thank you for your contribution once again Les.

      Have a good day.


  • Anthony says:

    What the main difference in shed design between an N2 rating and a C1wind rating?

    • Chai @ Cheap Sheds says:

      Hi Anthony, N2-rated sheds can withstand winds at 123km/hr while the C1 can withstand stronger winds of 147km/hr. But basically the designs in our range are the same as both are non cyclonic. Hope this helps.


  • Craig Sutherland says:

    Do you know anybody selling garden sheds (around the 4m x 3m size) rated at C3?

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