5,000 L water tanks
5 models we found listed for sale on 13 Nov 2026, from $940. Full, it covers a family of four for about 21 days of toilet and laundry use at 60 L a person a day (our assumption).
Models and listed prices
| Model | Litres | Size | Listed price | Where listed |
|---|---|---|---|---|
| Tankworld 5,000 L corrugated | 5,000 | Ø 1.84 × 2.15 m | from $940 | Tankworld. Price by delivery zone |
| Duraplas R5000sq | 5,000 | Ø 2.175 × 1.75 m | $1,295 was $1,350 | The Tank Factory. Freight $195 in standard areas |
| Duraplas R5000ur upright | 5,000 | Ø 1.8 × 2.47 m | $1,400 | The Tank Factory |
| Melro 5,500 L | 5,500 | Not listed | $1,231 | Bunnings |
| Kingspan 5,000 L round steel steel | 5,000 | Ø 1.9 × 1.86 m | $2,435 | Bunnings |
Prices as shown on the linked page on 13 Nov 2026, rounded to the dollar. Listings do not say whether delivery is included unless noted. Prices change; the seller's page decides.
Does a 5,000 L tank need approval?
A size pre-check for each listed model, against the limits on the linked council and state pages. Other conditions apply, such as setbacks, overlays and how the tank is used, so confirm with your council before you buy.
| Model | Size | QLD | NSW | WA | ACT | SA |
|---|---|---|---|---|---|---|
| Tankworld 5,000 L corrugated | Ø 1.84 × 2.15 m | Size OK | Size OK | Size OK | Size OK | Size OK |
| Duraplas R5000sq | Ø 2.175 × 1.75 m | Size OK | Size OK | Size OK | Size OK | Size OK |
| Duraplas R5000ur upright | Ø 1.8 × 2.47 m | Check | Size OK | Size OK | Size OK | Size OK |
| Kingspan 5,000 L round steel | Ø 1.9 × 1.86 m | Size OK | Size OK | Size OK | Size OK | Size OK |
Limits used: QLD no building approval under 3.6 m across, 2.4 m high and 10 m² (Sunshine Coast Council); NSW exempt up to 10,000 L above ground if all standards are met (Hornsby Council); WA permit over 5,000 L (Shire of Northam); ACT no DA up to 20 kL and 3 m (ACT Planning); SA approval over 10 m² and 4 m high (City of Onkaparinga). Victoria needs no building permit for a free-standing tank (VBA); Tasmania and the Northern Territory set no single size limit.
Base and delivery
Poly tank bases should be 300 mm wider than the tank on each side (Coerco). For the Tankworld 5,000 L corrugated that is a pad about 2.44 m across, 4.7 m². Gates and access decide whether the tank can be rolled in.
How much rain fills it
A 150 m² roof in Brisbane collects about 137,880 L a year at the Bureau of Meteorology's 1,149 mm average (BoM), counting 80% of the rain (our assumption for first flush and overflow). How fast a 5,000 L tank refills depends on when the rain falls.