When off-grid living makes sense

Off-grid living makes sense when connecting to mains services is impractical or expensive — typically rural properties where the nearest power, water or sewer main is far away. On urban or fringe blocks, mains connection is usually cheaper and simpler. Off-grid is a choice when the grid isn't available or when you want independence from utility bills. It requires upfront investment and ongoing maintenance, and it suits properties where the alternative (long service runs) is more expensive. It's not just a lifestyle choice — it's a financial and practical decision.

Power: solar, battery and generator

A stand-alone power system (SAPS) typically includes solar panels (generation), a battery bank (storage), an inverter/charger (management), and a backup generator (for extended cloudy periods). The system is sized to the cottage's expected daily energy use and the local solar resource. A basic system for a small cottage may cost $15,000–$35,000; a larger system with heavy loads (air conditioning, large battery) can be $40,000–$80,000 or more. The system must be installed by a licensed electrician and meet AS/NZS 4509 for stand-alone power systems.

Water: rainwater tanks

On an off-grid property, rainwater is usually the water supply. Tank size depends on roof area, local rainfall, and water use — a small cottage in a moderate-rainfall area often uses 20,000–50,000 litres. You'll need a pump, pressure controller, first-flush diverter, and filtration for potable water. Plumbing must meet AS/NZS 3500. In very dry areas, you may need a larger tank, a water carting plan, or a bore (subject to licensing). Some states require a minimum rainwater tank capacity for new dwellings.

Wastewater: septic and grey water

Off-grid properties need on-site wastewater management. A council-approved septic system handles black water; grey water (from showers, basins, laundry) can be treated and reused for irrigation or toilet flushing. The system must meet EPA requirements for setback distances and be installed by a licensed plumber. See our Septic Systems guide for types, approval and maintenance details. A combined composting-toilet-plus-grey-water system is an option for low-water-use households, but both parts need council approval.

The full cost picture

Going fully off-grid is a significant investment: power system ($15,000–$80,000+), water tanks and pumping ($5,000–$20,000), and septic system ($10,000–$30,000). There are also ongoing costs: battery replacement (every 10–15 years for lithium), generator fuel, septic pump-out, and water testing. Compare the total off-grid cost against the cost of connecting to mains — if mains connection is $50,000+ because you're far from the network, off-grid can be cheaper. If the main is at the boundary, mains is usually cheaper. Get both quotes before deciding.

Is off-grid right for you?

Off-grid suits properties where mains connection is unavailable or very expensive, and owners who are comfortable managing their own systems. It's not for everyone: it requires maintenance, monitoring, and an acceptance that energy and water are finite. If you're a heavy power user (air conditioning, large family) in a low-sunlight area, off-grid may be impractical or very expensive. A feasibility assessment compares the costs for your specific site so you can decide. Off-grid is a commitment, not a convenience.

Partial off-grid: the middle ground

You don't have to be fully off-grid. Many properties connect to mains power and use rainwater tanks for water and a septic system for wastewater. Or they connect to mains water and sewer and use solar (grid-connected) for power. Partial off-grid lets you reduce bills and increase independence without the full capital cost and maintenance of a complete off-grid setup. The right mix depends on what's available at your boundary and your goals.