Is Solar Worth It for a New Home Build in Australia?

Rooftop solar can reduce grid electricity purchases, but whether it represents good value for a particular new home depends on the installed price, generation, shading, network export limits, electricity tariff and how much solar energy the household uses directly.

The Numbers

System Costs

Prices include the federal STC discount, which reduces the upfront cost.

Savings

Solar generation varies by location, season, roof orientation, shading and system performance. How much you save also depends on how much of the generation you use directly:

• Self-consumption — each kWh used on site can reduce the amount of electricity bought from the grid at the applicable tariff
• Feed-in tariff — exported energy may earn a retailer feed-in tariff, which varies by plan and location
• Battery storage — stores excess daytime energy for evening use, maximising self-consumption

The financial benefit should be calculated from your own usage profile and a site-specific generation estimate. Ask any retailer or installer who quotes annual savings or a payback period to show the assumptions used for electricity tariffs, feed-in rates, solar generation, self-consumption and future price changes.

Payback Period

There is no single national payback period. Divide the net installed cost by the estimated annual benefit using your own tariff and usage assumptions, and consider maintenance, inverter replacement and any battery warranty or replacement costs.

Factors That Make Solar More Valuable

1. You're home during the day — maximises self-consumption (the most valuable energy)
2. You have meaningful daytime or flexible electricity use — more opportunity to use solar directly
3. You have electric hot water or EV — can be timed to use solar generation
4. Your roof faces north (or east-west) — optimal solar orientation
5. Your site has good solar access — local climate, roof orientation and shading all affect generation

Battery Storage: Worth It?

Battery pricing and incentives can change materially. The Australian Government Cheaper Home Batteries Program provides around a 30% discount on eligible solar-connected batteries, with tiered STC support applying from 1 May 2026. Whether a battery is worthwhile depends on:

Batteries are worth it if:

• You're home in the evening (when energy use is highest)
• Your feed-in tariff is low (excess solar isn't worth much exported)
• You want energy security (backup during power outages)
• The current after-incentive installed price and any additional state or local support

Batteries may not be worth it if:

• You have a high feed-in tariff (exporting is nearly as valuable as self-use)
• You're rarely home in the evening
• Budget is a concern (the payback period is longer)

Installing Solar During Your Build

There are significant advantages to installing solar during construction:

• Roof access is easy — no scaffolding needed
• Electrical integration — the solar conduit and wiring can be installed during rough-in
• Coordinate with your builder — ensure the roof design accommodates panels
• Potential builder discount — some builders offer solar packages at competitive rates
• Solar-ready — even if you don't install panels now, ask your builder to make the roof "solar-ready" with conduit and switchboard space

What to Look for in a Solar Installer

• Solar Accreditation Australia (SAA) accreditation — required for SRES-eligible installations
• Clear product specifications — panel and inverter make/model, warranties and approved-product status
• Site-specific design — proposed panel layout, inverter/battery location and expected generation assumptions
• Transparent quote — equipment, labour, extra electrical work and government incentive deductions shown clearly
• After-sales support — understand who handles workmanship, product warranty and service issues

How to Decide

Compare the net installed cost with a site-specific generation estimate and your household's actual or expected usage. Solar tends to deliver more value when you can use a good share of the generation on site, while battery value depends on solar surplus, later electricity demand, tariffs, backup needs and current incentives.

If you don't install solar immediately, ask your builder what practical solar-ready provisions can be included — such as suitable roof space, switchboard capacity and cable pathways — and get the exact scope in writing.

Find a SAA-accredited solar installer on Trade Connect, read our guide on solar-ready homes, or learn about solar power vs solar batteries.