Water tanks in Western Australia
In Western Australia, a water tank over 5,000 L needs a building permit. Tanks of 5,000 L or less are exempt under Schedule 4 of the Building Regulations 2012. Source
Do I need approval?
Over 5,000 L
Building permit
Schedule 4 of the Building Regulations 2012 exempts water tanks of 5,000 L or less. Larger tanks need a building permit. Shire of Northam
Check
Planning
Planning rules are set by your local government. Ask them before you place a large tank near the street or a boundary.
Licence
Plumbing
Since 10 February 2025 installers connecting a tank outlet to a building need a restricted plumbing permit (rainwater storage) or a plumbing licence. Building and Energy WA
Bushfire water
We have not loaded a statewide static water table for Western Australia. Fire water requirements come from your council, development conditions or fire service.
Work out your lotNew homes and renovations
No statewide tank mandate. Since 10 February 2025 anyone connecting a tank outlet to a building needs a restricted plumbing permit (rainwater storage) or a plumbing licence. Building and Energy WA
What size works here
Perth Metro averages 727 mm of rain a year. Bureau of Meteorology
Coerco lists poly tanks from around $512.60 for 1,000 L and around $1,826 for 9,500 L. Coerco
1,000 L3,000 L5,000 L10,000 L22,500 L46,400 L
Size a tank for WARebates
| Program | What | Until | Status |
|---|---|---|---|
| Water Corporation Selected regional towns on scheme water | Up to $1,000 for a new tank of 2,000 L or more plumbed into the toilet or washing machine; up to $500 to plumb in an existing tank. | Open from 1 June 2026 until funds run out | Open |
From council and water-utility pages, checked 13 Nov 2026. All rebates
Suppliers for WA
| Supplier | Materials | Delivery area, as the supplier states it |
|---|---|---|
| Kingspan Water Tanks | steel, poly | Australia-wide |
| Coerco | poly, steel | Queensland, Western Australia, South Australia, Northern Territory |
| Bunnings (special order) stockist | poly, steel | Stores Australia-wide; tanks are mostly special order |
Unclaimed listings from the suppliers' own pages, checked 13 Nov 2026. We have checked suppliers mainly for south east Queensland and northern NSW so far; more for WA follow. Supply WA? Claim or add a listing.
Questions
Do I need a permit for a 10,000 L tank?
Yes. Water tanks over 5,000 L need a building permit. Shire of Northam
Is there a rebate?
Water Corporation offers up to $1,000 in selected regional towns for a new tank plumbed into the toilet or washing machine, open from 1 June 2026 until funds run out. Water Corporation