For many homeowners, especially those in urban areas or on small blocks, the challenge of water storage isn’t whether it’s a good idea—it’s where on earth to put a tank. With land sizes shrinking across Australia and backyards turning into compact courtyards, traditional round tanks aren’t always practical.
But the good news? You don’t need a sprawling backyard to enjoy the benefits of rainwater harvesting. With clever design and innovation, water storage can be virtually invisible. Let’s explore the best space-saving water storage solutions for homes where every square metre counts.
What Are Hidden Water Tanks?
Hidden water tanks are designed to blend into your home or garden, or be tucked away in unused areas—out of sight, but still fully functional. These tanks maximise your water-saving potential without compromising your space or lifestyle.
There are three main types of hidden tanks ideal for tight spaces:
- Slimline rainwater tanks
- Underdeck water tanks
- Underground water tanks
Each offers unique benefits depending on the layout of your home and garden, and all are built to help you collect and store rainwater without sacrificing space.
Slimline Rainwater Tanks: Ideal for Side Passages and Tight Corners
Best for: Narrow walkways, walls, and fence lines
Slimline tanks are exactly what they sound like—tall, narrow, and designed to fit snugly along walls and fences. They’re perfect for inner-city homes or suburban blocks where space is at a premium.
✔️ Space-saving design—some as slim as 300mm wide
✔️ Can be placed close to the house to collect roof runoff efficiently
✔️ Modular options allow multiple tanks to be joined for larger capacity
✔️ Stylish profiles that blend with modern home design
Whether you want to collect water for your garden or connect it to your laundry and toilets, slimline rainwater tanks are an efficient, unobtrusive option for residential use.
Underdeck Water Tanks: Storage Where You Least Expect It
Best for: Decks, patios, verandas
If you’ve got a deck, chances are you’ve got wasted space underneath it—space that could be working hard to store your rainwater. Underdeck water tanks turn this under-utilised area into a hidden reservoir.
✔️ Completely hidden from sight
✔️ Ideal for homes with timber or raised decks
✔️ Low-profile design fits under 600mm
✔️ Connect multiple tanks to increase storage
These tanks are designed to be low and wide, making them ideal for tight vertical spaces where traditional tanks simply won’t fit. They’re particularly popular for homeowners looking to maximise outdoor space without compromising storage.
Underground Water Tanks: Maximum Storage, Zero Visual Impact
Best for: New builds, landscaped yards, and long-term solutions
If you want to go completely invisible with your water storage, underground water tanks are the ultimate solution. Once installed and buried beneath your lawn, driveway, or garden, you won’t even know they’re there—but you’ll have thousands of litres on standby.
✔️ Completely hidden from view—great for preserving your landscaping
✔️ Large capacities available (up to 5,000L per unit and expandable)
✔️ Ideal for new home builds or major renovations
✔️ Protected from UV rays and extreme weather
Underground tanks are built tough, with reinforced walls to resist earth pressure and withstand being buried for decades. They’re a smart choice if you’re committed to long-term water savings and don’t want a tank taking up precious garden space.
Explore Underground Water Tanks
Who Are Hidden Water Tanks Perfect For?
Hidden tanks aren’t just a clever idea—they’re a game-changer for:
- Homeowners with small yards or no backyard at all
- City dwellers looking to make every metre count
- Architects & builders designing space-conscious homes
- Eco-conscious families wanting to harvest water discreetly
- Gardeners who want rainwater storage but love a clean aesthetic
Why Space-Saving Water Storage Matters More Than Ever
In many parts of Australia, water restrictions are becoming a regular part of life. Even in wetter regions, water sustainability is a growing concern. Rainwater harvesting not only saves you money—it reduces pressure on municipal supplies and helps you live more sustainably.
But just because you don’t have a huge yard doesn’t mean you should miss out on the benefits of water storage. With modern solutions like slimline, underdeck, and underground tanks, smart water storage is now possible for everyone.
The Water Tank Factory Has a Hidden Water Tank for Every Home
Whether you’re working with a narrow courtyard, a raised deck, or a clean modern build, The Water Tank Factory has a hidden water tank that fits.
We offer:
Australia’s largest range of slimline rainwater tanks
Tough, UV-resistant underdeck tanks
Durable, long-lasting underground tanks for total concealment
Our tanks are manufactured with superior poly shot weight and even wall thickness for long-term durability. An investment you can count on for many years to come- we guarantee it. Plus, with multiple colours and configurations, you can match your tank to your space and style, creating something that is truly unique to you.
Start storing smart—visit our site to find the hidden water tank that’s right for you:
The Water Tank Factory – Complete Water Tank Range