Whole House Water Filter Cost in Australia: What to Expect

A whole house water filter is one of the most effective investments you can make for your home’s water quality — but the cost varies significantly depending on the system type, size, and whether you install it yourself or use a plumber. Here’s a clear breakdown of what to expect in Australia.

Browse our whole house filter range or see our Whole House Water Filters Guide for help choosing the right system.

System Cost by Type

Installation Cost

For most Australian homes, a twin Big Blue system is a manageable DIY installation — see our Whole House Water Filter Installation Guide. If you prefer a licensed plumber, expect to pay $300–$800 for a straightforward installation on accessible plumbing. More complex installations (copper pipe requiring soldering, difficult access, or multi-stage systems) can run higher.

The commonly cited average total cost of around $1,765 for a professionally installed whole house system covers the unit, cartridges, plumbing supplies, and labour.

Ongoing Maintenance Costs

The ongoing cost of a whole house filter is low — just replacement cartridges every few months:

• Sediment cartridge: $15–$40, replaced every 2–6 months
• Carbon block cartridge: $25–$60, replaced every 4–6 months
• Annual cartridge spend (twin system): approximately $80–$200 per year

Browse our replacement cartridge range for current pricing.

What Affects the Total Cost?

• Number of filtration stages: single, twin, or triple stage — more stages mean better filtration and higher upfront cost
• Housing size: 10" x 4.5" Big Blue housings cost more than slim-line 2.5" housings but handle higher flow rates
• Micron rating: finer cartridges (lower micron) cost slightly more and need replacing more frequently
• Add-ons: UV sterilisation, water softeners, or RO stages significantly increase cost
• Installation complexity: copper pipe, difficult access, or multi-story homes increase plumber labour time

Is It Worth It?

For most Australian households, a twin Big Blue system ($300–$600 + DIY installation) is the most cost-effective entry point. It removes chlorine, sediment, and taste/odour compounds from every tap in the home — protecting appliances, improving shower water quality, and eliminating the need for point-of-use filters at every tap. The annual cartridge cost of $80–$200 is modest compared to the ongoing cost of bottled water or multiple point-of-use filters.

Frequently Asked Questions