Why poly tanks suit Highlands acreage
Poly tanks are one-piece, light enough to deliver to most rural sites and come in Colorbond-matched colours so they sit quietly beside a house or shed. Sizes run from around 5,000L up to 31,500L+, which covers everything from a shed top-up to a household that relies on rainwater.
What a turnkey poly tank install usually includes
- ✓A level, compacted crusher-dust pad sized to the tank
- ✓Delivery and placement of the tank
- ✓Downpipe connection with leaf screening and a first-flush diverter
- ✓Overflow directed away from the pad and buildings
- ✓A pressure pump and connection to the house or shed, done by a licensed plumber
- ✓Optional mains-backup switching where town water is available
Typical cost
As a guide, a turnkey package including a 22,500L Australian-made poly tank, compacted crusher-dust pad preparation, delivery, pressure pump and basic downpipe connection typically ranges from $4,200 to $7,500, depending on trenching distance and pump specs. The installer will confirm an itemised price after looking at your site.
Highlands conditions to plan for
Cold winters mean exposed pumps and pipework need frost protection. Many properties are mapped as bushfire prone, which can affect tank material and outlets. And a full tank is very heavy, so the base needs to be level and compacted. More on rainwater tanks in the Southern Highlands.
Frequently Asked Questions
How much does a 22,500L rainwater tank installed cost in the Southern Highlands?+
A turnkey package including a 22,500L Australian-made poly tank, compacted crusher-dust pad preparation, delivery, pressure pump, and basic downpipe connection typically ranges from $4,200 to $7,500 depending on trenching distance and pump specs.
Can a poly tank be used as my fire-fighting water supply?+
Generally not for a dedicated supply. NSW RFS guidelines call for above-ground fire-fighting tanks to be concrete or metal. A poly tank is fine for household rainwater, with a separate steel or underground tank for the fire reserve. Check with your certifier or NSW RFS.
Do I need approval for a rainwater tank?+
Many above-ground rainwater tanks can go in as exempt development in NSW if they meet the set conditions (such as size, height and setbacks). Larger tanks, underground tanks or properties with heritage or other constraints may need approval, so check with Wingecarribee Shire Council or your certifier before work starts.
How Highlands Tank Pros works
Highlands Tank Pros is a local lead-matching service connecting Southern Highlands property owners with independent, licensed plumbers and rainwater tank installers. When you call or send a request, we pass your details to a local installer who contacts you to quote. The installer you’re matched with is responsible for the work, its pricing and any warranties.