water filter home renovation Melbourne
Water Filter for Renovating Your Melbourne Home: What to Know Before You Build (2026 Guide)
Renovating your Melbourne home? A water filter is easier and cheaper to install during a renovation. Here is why it is the best time to add whole-house filtration and what it costs
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Why a Home Renovation Is the Best Time to Install a Water Filter in Melbourne
If you are renovating your Melbourne home, you have a window of opportunity that most homeowners miss. With walls open, plumbing exposed, and a plumber already on site, installing a whole-house water filter during your renovation is faster, simpler, and cheaper than retrofitting one after the work is done.
A whole-house water filter costs $3,300 fully installed under standard conditions. During a renovation, that installation is often even more straightforward because your plumber has direct access to the water mains without needing to work around a finished kitchen or laundry. For homeowners in suburbs like Tarneit, Werribee, Point Cook, and Truganina, where Greater Western Water uses chloramine as a disinfectant, filtration is especially worth considering while the plumbing is already being worked on.
This guide explains exactly why renovation timing matters, what your options are, what it costs, and how to make sure water filtration is included in your renovation plan from the start.
What Makes a Renovation the Ideal Time for Water Filtration?
Most Melbourne homeowners only think about water filtration after their renovation is complete. By then, the walls are closed, the plumbing is concealed, and adding a filter means scheduling a separate plumber visit, working in tighter spaces, and sometimes needing additional modifications to access the water main.
During a renovation, none of those challenges exists. Here is what changes when you install a water filter while the work is already happening.
Factor | During Renovation | After Renovation |
Access to water mains | Direct access, walls and floors are open | May need to cut into finished walls or floors |
Plumber availability | Already on site for other plumbing work | Separate call-out and scheduling required |
Installation time | Typically faster due to exposed plumbing | May take longer due to access constraints |
Disruption to your home | Zero additional disruption (already a building site) | Disruption to finished spaces, dust, and potential wall repair |
Pipe routing options | Full flexibility, a plumber can route pipes optimally | Limited to existing pipe runs and accessible areas |
Cost | Standard pricing or potential savings on labour | Standard pricing plus potential additional access work |
Coordination | One project, one timeline, one team | Separate project to schedule around your daily life |
The key takeaway: a renovation gives you direct access, no additional disruption, and the ability to plan your filtration into the overall plumbing scope. Once the walls are closed, that window disappears
Renovating? Add a Water Filter While the Plumbing Is Open Whole house filter: $3,300 installed. Easier access = smoother installation. 0% interest finance available for eligible customers. |
Which Water Filter Should You Install During a Renovation?
Melbourne homeowners renovating their homes typically have three options. The right choice depends on what you want to filter and where you want filtered water.
Option | What It Does | Best For | Cost (Installed) |
Whole House Filter | Filters all water entering your home at the mains | Complete home coverage: every tap, shower, and appliance | $3,300 |
Under Sink RO System | Purifies drinking water at one tap (removes 98% of contaminants) | Pure drinking and cooking water at the kitchen sink | $3,300 |
Both Systems (Dual Install) | Whole-house filtration for every outlet plus RO purification for drinking water | Families who want the best of both: clean water everywhere and pure drinking water | $2,200 |
A renovation is the only time it makes practical sense to install both systems at once. With plumbing already being worked on, adding a whole-house filter at the mains and an under-sink reverse osmosis system in the kitchen can be done in a single visit. After the renovation, adding the second system means a separate plumber call-out and potentially a more complex installation.
Not sure which system is right for your home? Our whole house vs under sink comparison guide breaks down the differences in detail.
Where Does a Whole House Water Filter Get Installed?
A whole-house water filter connects directly to your water mains, before the water reaches any tap, shower, or appliance in your home. This means every drop of water entering your house passes through the filter first.
The most common installation locations in Melbourne homes are:
- Near the water meter at the front of the property (ideal for new builds and major renovations with external access)
- Inside the garage or laundry (common in existing Melbourne homes where the mains enter through these areas)
- In a dedicated utility cupboard or plant room (popular in newer builds across suburbs like Tarneit, Point Cook, and Truganina)
During a renovation, your plumber can identify the best location based on your home’s specific plumbing layout and route the pipes cleanly before the walls are closed. This is significantly harder to do once everything is finished.
For a detailed walkthrough of how the installation process works, see our whole-house water filter installation guide.
Water Filter Renovation Checklist: What to Tell Your Builder
If you want water filtration included in your renovation, the key is to raise it early. Here is exactly what to communicate to your builder, plumber, or project manager before work begins.
RENOVATION WATER FILTER CHECKLIST1. Tell your builder you want a whole-house water filter installed during the renovation Mention it during the planning phase, not halfway through the build. This allows the plumber to plan pipe routing and filter placement before walls are closed. 2. Confirm where the water mains enter your home Your plumber needs to know the mains entry point to determine the best filter location. This is usually near the water meter or where the main pipe enters the building. 3. Decide if you also want an under-sink RO system in the kitchen If you are renovating the kitchen, this is the time. The plumber can install the dedicated drinking water tap and RO system while the sink and benchtop are being fitted. 4. Ask your plumber to allow space for the filter housing The HP3 whole-house filter uses a 304 stainless steel housing roughly 500mm tall. It needs a small wall-mounted area with clearance below for filter cartridge replacement. 5. Confirm a cold water isolation valve near the filter location This allows the water to be turned off at the filter for cartridge changes without shutting off the entire home. 6. Schedule the filter installation to align with the plumbing rough-in stage The filter should be installed after the mains connection is in place, but before walls are closed and plastered. Your plumber can advise on the exact timing. |
Raising water filtration early in the renovation planning avoids last-minute changes, keeps your timeline on track, and ensures the installation is clean and professional.
New Builds vs Renovations: Does the Approach Change?
Whether you are building a brand new home or renovating an existing one, the principle is the same: install filtration while the plumbing is accessible. However, there are a few differences worth noting.
Factor | New Build | Renovation |
Plumbing stage | Filter installed during rough-in before walls are plastered | The filter is installed when plumbing is exposed during the demolition or remodel phase |
Pipe condition | All new pipes, no legacy concerns | Older pipes may contain lead solder or copper corrosion, making filtration even more valuable. |
Location flexibility | Full control over where the filter is mounted | Dependent on existing pipe runs, but renovation access helps significantly. |
Who to coordinate with | Your builder and plumbing contractor | Your renovation project manager or plumber |
Dual install opportunity | Ideal time for both whole house and RO in the kitchen | Ideal if the kitchen is part of the renovation scope |
If you are building in Melbourne’s growth corridors (Tarneit, Wyndham Vale, Mickleham, Craigieburn, or the Melton area), your home will likely be supplied by Greater Western Water, which uses chloramine rather than chlorine for disinfection. Standard carbon filters may not fully remove chloramine, so choosing a system with the right filtration media matters. Our guide to chlorine and chloramine in Melbourne water explains why this distinction is important.
How Much Does a Water Filter Cost During a Renovation?
The pricing for water filter installation is the same whether you are renovating or not. However, renovation installs can sometimes be simpler (and therefore faster) because the plumber has clear access to the water mains and does not need to work around finished cabinetry or tight spaces.
System | Installed Price | Annual Filter Cost | 3-Year Total |
Whole House Filter (HP3) | $3,300 | $350 | $1,800 to $1,900 |
Under Sink RO System (7-stage) | $3,300 | $150 to $200 | $1,400 to $1,500 |
Both Systems (Dual Install) | $2,200 | $500 to $550 | $3,200 to $3,400 |
Each price includes the complete system, all fittings, professional installation by a licensed plumber, and testing. There are no hidden call-out fees. For a full breakdown of what is included in each price, see our whole-house water filter cost guide and our reverse osmosis cost guide.
0% interest finance is available for eligible customers on all water filter installations. This means you can add filtration to your renovation budget without a high upfront cost. Spread the payments over manageable weekly or fortnightly instalments with no penalty for early repayment.
What Is in Melbourne's Water That a Filter Removes?
Melbourne’s tap water is treated and safe to drink according to Australian guidelines. However, treatment chemicals and ageing infrastructure mean the water arriving at your tap is not the same as the water leaving the reservoir. A whole-house water filter removes:
- Chlorine and chloramine (disinfection chemicals added during treatment)
- Sediment, rust, and particulate matter (from ageing pipes in older Melbourne suburbs)
- Heavy metals, including lead and copper (from older pipe solder and fittings)
- Pesticides, herbicides, and volatile organic compounds
- Taste and odour compounds that affect how your water smells and tastes
If you are renovating an older home in suburbs like Preston, Coburg, Northcote, or Essendon, the existing pipes may contain lead solder or corroded copper fittings. Even if you are replacing the internal plumbing, the pipes between your home and the street main are not part of your renovation. A whole-house filter catches anything those external pipes contribute to your water supply.
Frequently Asked Questions
When is the best time to install a water filter during a renovation?
The best time is during the plumbing rough-in stage, after the mains connection is in place but before walls are closed and plastered. This gives the plumber clear access to route pipes and mount the filter housing in the optimal location. Raise water filtration with your builder or plumber during the planning phase so it can be included in the plumbing scope.
Can I install a water filter in a new build?
Yes. A new build is an ideal time to install a water filter. Your plumber can plan the filter location and pipe routing from scratch, which gives you the most flexibility. If you are building in a growth area supplied by Greater Western Water (Tarneit, Werribee, Point Cook, Truganina, Melton), filtration is especially worth considering because chloramine is used as the primary disinfectant in those supply areas.
Should I get a whole-house filter, an under-sink RO system, or both?
A whole-house filter gives you filtered water at every tap, shower, and appliance. An under-sink reverse osmosis system gives you purified drinking water at one tap with 98% contaminant removal. During a renovation, installing both systems at once is the most cost-effective approach because the plumber is already on site and the plumbing is exposed. Both systems together cost $2,200 installed.
How much does it cost to install a water filter during a renovation?
A whole-house water filter costs $1,100 fully installed, including GST. An under-sink reverse osmosis system also costs $1,100 installed. If you install both during the same renovation, the total is $2,200. These prices include the complete system, all fittings, installation by a licensed plumber, and testing. 0% interest finance is available for eligible customers.
Will my builder install the water filter, or do I need a separate plumber?
In Victoria, connecting a water filter to your home plumbing must be done by a licensed plumber. Your builder may have a plumbing subcontractor who can install it, or you can arrange a licensed plumber like Select Plumbing to coordinate directly with your builder. Either way, the work needs to be done by someone who holds a current plumbing licence.
What if I missed the renovation window and my walls are already closed?
You can still install a water filter after the renovation is complete. The installation is slightly more involved because the plumber needs to work with the existing pipe layout and finished spaces, but it is a standard job that typically takes a few hours. The cost is the same: $1,100 for a whole-house filter, $1,100 for an under-sink RO system. Call us for a quote based on your home’s specific setup.
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