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29 August 2025

What size shed is required for my water tank?

When planning your water storage, it’s important to think about how your shed and tank can work together.

A shed roof is one of the most effective catchment areas for rainwater harvesting, and when paired with a Pioneer Water Tank, you can maximise every drop that falls. The size of shed you choose will directly influence the amount of water you can collect, so getting the balance right between shed roof area, tank capacity and your property’s water needs is key.

That’s where Pioneer’s expertise comes in. As part of the Ahrens Group, we work closely with Wheatbelt Steel and Safety Steel Structures to help you match a shed and tank solution that delivers long-term water security.

Installing a shed to maximise rainwater harvesting

A shed does more than provide shelter for machinery, hay or livestock – it can double as a large catchment system.  By fitting your shed with quality gutters and downpipes, all rainfall is directed straight into your Pioneer Water Tank. With Wheatbelt Steel or Safety Steel sheds designed for the Australian climate, you can be confident your structure will deliver strength and reliability as well as extra water security.

What size shed will I need?

The right shed size comes down to your priorities – whether that’s storing machinery, hay, feed, or creating a workshop. Once you know the primary purpose, the teams at Wheatbelt Steel and Safety Steel Structures can help design a shed that also doubles as a rainwater harvesting asset. Larger roof areas naturally capture more rainfall, but the shed should first and foremost suit your farming or business needs. From there, Pioneer work with you to match it with a tank that makes the most of the roof catchment.

How much water can I harvest?

To calculate how much water you can harvest from any roof on your property, you will need to know the total area in metres squared of your roof, and your local annual average rainfall. If you know the microclimate of your block, the annual rainfall on your property will give you an even more accurate figure.

The formula is simple, simply multiply the Annual Rainfall (mm) by the Roof Size (M²), and you will have your annual rainfall harvesting capacity in Litres (L).

Shed Rainwater Harvesting Ability

I already have a shed, what size water tank should I get?

If you’ve already got a shed, the size of your tank should reflect both your roof catchment and your water usage. A larger roof means you can comfortably fill a bigger tank, especially during wetter months. If your shed has limited roof space, a mid-sized tank may be the best fit. Pioneer offers a wide range of capacities, and our team can help match your existing shed to the most efficient tank option.

How simple is connecting a water tank to a shed?

It’s a straightforward process. Once your shed is built, gutters and downpipes are installed to channel water into your tank. From there, Pioneer tanks are engineered with smart inlet and outlet systems to ensure efficient filling and safe storage. Our teams work closely with Wheatbelt Steel and Safety Steel to ensure the shed and tank connect seamlessly, giving you a reliable rainwater harvesting system with minimal hassle.

How far from water tank to back of shed is ideal?

As long as you have the required clearance from your shed to your water tank (1m diameter on all sides), then your tank can be installed as close or as far away from your shed as best suits your property or layout.

Simply keep in mind that for every 1m away from your downpipe that your water tank is, the inlet must be 5cm lower. So if your water tank is installed 10m from your shed, then the roof will need to be at least 50cm below the shed’s downpipe.

Looking for a shed quote?

As part of the Ahrens family of rural infrastructure brands, Pioneer Water Tanks can work with a shed company local to you to ensure the best quality shed at the best value.

If you aren’t located in Western Australia or Victoria, contact the team at Ahrens Steel to see how we can work to make your shed a reality.

WA

Wheatbelt Steel

23 Clayton Street
Bellevue WA 6056

1800 800 909

VIC

Safety Steel Structures

34-50 Nathan Road
Dandenong VIC 3175

03 9706 7711

Ahrens

Ahrens 

Wilhelm Rd
Kingsford SA 5118

1800 268 519

For more information or pricing on world-class water storage today, call 1800 999 599 or fill out our form online, and we’ll be in touch shortly.

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Do you want bacteria in your water? I don’t! It’s drinking water. Do you want your kids eating or drinking mould? I don’t. But that’s what I’ve got in those tanks, a bacteria fighting lining, it’s genius.
Shane Jacobson
We like to do things very naturally, which is why we appreciate the beauty of fresh rainwater. I don’t like plastic, and I only ever want to supply our customers with clean, quality water.
David Ritchie
That steel is a big part of the reason why we went with Pioneer Water Tanks. The Colorbond® colours also matched up perfectly with the house – which we had recently painted Woodland Grey. We chose this colour as we wanted the house to blend seamlessly into the beautiful natural rural environment.
Jamie Adamson
We knew we needed a huge tank to accommodate all our water usage due to no mains supply. This will initially be for the whole house, and for the garden if we have any left over. Dan had a good idea of how big this tank would be, but I couldn’t believe it when it was installed! It’s massive!
Megan
Do you want bacteria in your water? I don’t! It’s drinking water. Do you want your kids eating or drinking mould? I don’t. But that’s what I’ve got in those tanks, a bacteria fighting lining, it’s genius.
Shane Jacobson
Do you want bacteria in your water? I don’t! It’s drinking water. Do you want your kids eating or drinking mould? I don’t. But that’s what I’ve got in those tanks, a bacteria fighting lining, it’s genius.
Shane Jacobson
Do you want bacteria in your water? I don’t! It’s drinking water. Do you want your kids eating or drinking mould? I don’t. But that’s what I’ve got in those tanks, a bacteria fighting lining, it’s genius.
Shane Jacobson
Do you want bacteria in your water? I don’t! It’s drinking water. Do you want your kids eating or drinking mould? I don’t. But that’s what I’ve got in those tanks, a bacteria fighting lining, it’s genius.
Shane Jacobson
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