Hiring a water tank installer: what to ask, what to avoid
Two water tank quotes for the “same” job often aren't the same job at all — the gap is usually scope: what's included, what's billed as an extra, and what you confirmed before you booked. Here's how to tell a fair deal from an expensive one, grounded in real pricing data.
The one that catches most people out
Underestimating total cost
A $2,000 tank becomes $8,000+ with pump, plumbing, filter, and stormwater integration.
Questions to ask a water tank installer
Most overcharging hides in the scope, not the headline price. These pin it down before you commit.
- 1
Does your quote include underground excavation, or is that extra?
- 2
Is plumbing to house part of the price, or charged separately?
If it's extra, expect around $800–$2,000.
- 3
Will I be charged extra for filtration?
- 4
Is stormwater redesign included, or an add-on?
- 5
Can you put the full scope and the final price in writing before any work starts?
Scope disputes are the single most common complaint. A written list is what protects you.
- 6
Is GST included in the price you have quoted?
A sole trader under $75k turnover can legally leave GST off, which makes a quote look about 10% cheaper than a registered business for the same work.
Three checks that take five minutes
Check the licence
For licensed trades, ask for the licence number and confirm it on your state's fair-trading or licensing site before you book. Unlicensed work can void your insurance.
Confirm they're insured
Public liability cover protects you if something gets damaged on the job. If an operator can't confirm it, that's a red flag.
Insist on a written quote
A fair quote itemises the scope, names what's excluded, and states whether GST is included. Verbal quotes are where disputes start.
What's usually included, and what costs extra
Usually included
- ✓Tank supply
- ✓Basic installation
- ✓Pump
- ✓Downpipe connection
Usually charged extra
- +Underground excavation
- +Plumbing to house · $800–$2,000
- +Filtration
- +Stormwater redesign
- +Council permits
What pushes the price up: underground installation, distance from house, number of tanks, stormwater integration, pump type, council requirements.
Water Tanks & Stormwater questions, answered
Do I need council approval?+
How long does installation take?+
Already have a quote?
Check it against real water tank prices in 30 seconds, then walk in knowing exactly what to ask.