How to Achieve Water Targets in the BASIX Certificate?

BASIX water targets are minimum sustainability standards that new homes and renovations in NSW must meet to get a BASIX Certificate.

These targets ensure buildings use less potable water through efficient fixtures, rainwater systems, and landscaping design. Working with expert BASIX consultants helps you meet BASIX water targets efficiently and avoid costly resubmissions.

What Are BASIX Water Efficiency Targets?

BASIX stands for Building Sustainability Index.

Water efficiency targets set specific limits on potable water usage. Each project gets assessed based on how many people will live there and what type of dwelling it is. A BASIX Certificate documents all of this before any Development Application can proceed.

Why Meeting BASIX Water Targets Actually Matters?

Projects stop dead without proper BASIX approval. Councils won’t touch a DA without an approved BASIX Certificate attached. Non-compliance creates several headaches:

• DAs get paused for weeks or months.
• Designs get sent back for expensive modifications.
• Construction schedules fall apart.
• Resubmission fees and consultant charges stack up.

Getting it right delivers tangible wins:

• Water bills drop 30-40% compared to homes built before BASIX existed.
• Council approvals process faster with fewer queries.
• Properties fetch better prices thanks to sustainability credentials.
• Each home reduces the demand on the public water supply.

Every home using less mains water helps the broader system cope. A properly prepared BASIX Report demonstrates that a project won’t add to the problem.

5 Proven Tips to Achieve Water Efficiency For the BASIX Certificate

Tip 1: Install High-Efficiency Fixtures and Fittings

The Water Efficiency Labelling Scheme puts stars on products based on actual water consumption. More stars mean less water used. Target 4-5 star products across the board. Showerheads, toilets, taps—all of them.

Trying to save money here often backfires. Cheaper fixtures mean needing a larger rainwater tank to compensate. Tanks cost thousands more than the fixture savings.

Tip 2: Harvest and Reuse Rainwater

Rainwater tanks have become standard equipment for meeting BASIX water targets. Most projects need them to hit the required numbers.

• The tank must connect to toilets as a bare minimum. BASIX requires this connection.
• Adding laundry taps and garden irrigation to the system boosts the score further.

BASIX consultants model different scenarios. They’ll show which tank size hits targets without paying for unused capacity. A tank that’s too small fails BASIX. One that’s too large wastes money sitting half-empty most of the year.

Tip 3: Design Water-Wise Landscapes

Traditional Australian gardens developed when water was cheap and abundant. Those days are gone.

Native plants change the equation completely. They’ve adapted to local rainfall patterns over thousands of years. Most need minimal watering once their roots establish. Switch to these sustainable alternatives:

• Kangaroo grass or native sedges
• Local shrubs suited to the specific region
• Groundcovers and succulents

Drip irrigation delivers water exactly where plants need it. Spray systems lose huge amounts to evaporation. Drip lines cost about the same to install but use 40-50% less water.

Mulch works wonders, too. A good 7-10cm layer of organic mulch retains soil moisture and suppresses weeds. Gardens need less watering and look better maintained.

Smart irrigation controllers with moisture sensors stop systems running when the soil is already damp. They’re not expensive—typically $250-400 installed—but prevent massive water waste from over-watering.

Keep lawn under 30% of total landscape area. These BASIX water certification tips work without creating boring yards.

Tip 4: Reuse Greywater Where Feasible

Greywater comes from showers, bathroom sinks, and washing machines. It’s different from blackwater (sewage from toilets). Can’t drink it, but gardens don’t care.

Each household member produces 50-100 litres of greywater daily. Diverting half of that to irrigation significantly reduces mains water consumption.

Greywater system essentials:

• Requires council approval before installation starts
• Must comply with AS/NZS 1547 standards
• Cannot water vegetables or edible plants
• Needs filtration to remove particles
• Works best on flatter blocks with good drainage

Not every site suits greywater. BASIX consultants assess whether greywater makes sense for a particular property.

When conditions align, it provides a substantial boost to the BASIX Report scores. When conditions don’t work, they recommend other strategies instead.

Tip 5: Optimise Building Orientation and Roof Design

Roof configuration has a bigger impact on rainwater collection than most people realise. Small design decisions made early multiply into large efficiency gains.

Roof design elements that improve capture rates:

• Simple shapes with clear drainage patterns
• Downpipes sized at 100mm diameter minimum
• First-flush diverters that discard initial dirty water
• Colorbond or similar materials that don’t contaminate runoff

This planning costs nothing. Yet it’s consistently overlooked as a way to meet BASIX water efficiency targets without adding expense.

Real Project: Western Sydney Duplex Success Story

A recent Western Sydney duplex demonstrates how these five tips work together to attain water efficiency for BASIX.

The installation breakdown:

• One 5,000L rainwater tank shared between both dwellings.
• 5-star WELS showerheads and taps in all wet areas
• 4-star dual-flush toilets in each bathroom
• Native garden with drip irrigation throughout
• Greywater diversion system feeding outdoor areas

What happened:

• Achieved 42% potable water reduction versus standard construction
• BASIX Certificate approved on first submission attempt
• The construction cost increase stayed under 3% of the total budget.
• Projected water bill savings of $600 annually per dwelling

Council approval came through without delays or requests for modifications. The builder planned for water efficiency for BASIX from the initial design. That decision saved time, money, and frustration.

How BASIX Consultants Simplify Water Compliance?

Accredited consultants prepare BASIX assessments constantly. Professional consultants handle:

• Site-specific water use modelling based on actual climate zone data
• Product recommendations that balance upfront cost against BASIX performance
• Complete BASIX Report preparation with verified, accurate data entry
• Direct submission through the NSW Planning Portal using their credentials
• Quick turnaround on revisions if the council raises any queries

Top consultants maintain approval rates above 95%. They catch errors before submission happens. They recognise which products the BASIX tool accepts and which create complications.

Complex projects—multiple dwellings, challenging sites, heritage constraints—make experienced BASIX consultants essential.

Making BASIX Water Compliance Work

Meeting BASIX water efficiency targets comes down to planning and product selection. It doesn’t require expensive exotic solutions or complicated engineering.

Professional BASIX consultants eliminate uncertainty from the process. They ensure the BASIX Report gets approved quickly, so nothing holds up the Development Application. For NSW residential projects, that expertise delivers clear value worth the investment.