Your home is unique.
Find out your home's energy star rating in minutes with the EnBright Calculator. Then see exactly which upgrades will save you the most, and what they'll cost.
Your home's Efficiency rating
Start with the EnBright Calculator.
Answer nine questions about your home and get an estimated NatHERS star rating, projected energy savings, and a personalised list of upgrades with cost estimates in one minute.
Free · No sign-up required to start
What is a NatHERS Assessment?
Your home has a star rating.
Australia's Nationwide House Energy Rating Scheme (NatHERS) scores your home from 0 to 10 stars for thermal performance. That's how well it stays warm in winter and cool in summer without relying heavily on mechanical heating or cooling.
Most existing Australian homes score between 1 and 2 stars. The 2022 National Construction Code requires new homes to reach 7 stars. The EnBright Calculator gives you an estimate of where your home sits. A formal accredited assessment locks in your official rating.
What drives your star rating
Roof & Ceiling
Insulation levels, roofing material, ceiling construction
High impactWindows & Glazing
Size, orientation, glazing type, shading devices
High impactWalls
Construction type, insulation, thermal mass
Medium impactFloor
Slab, suspended floor, underfloor insulation
Medium impactAir Sealing
Draughts, gaps, uncontrolled ventilation pathways
High impactOrientation
Solar access, prevailing winds, shading context
Medium impactAll six elements are assessed and modelled together to calculate your star rating. The EnBright Calculator estimates each. A formal NatHERS assessment measures them precisely on-site.
How It Works
From calculator to upgraded home.
Start online in minutes. Go as deep as you need, from a quick estimate all the way to an official NatHERS certificate and verified professional quotes.
EnBright Calculator
Answer questions about your home's construction, location and existing features. Get an estimated star rating, projected energy savings, and a prioritised upgrade list with cost estimates.
Select your upgrades
Review your upgrade options ranked by impact and payback period. Choose the ones that fit your budget and goals. Stage 1 can often pay for itself within a few years.
Get quotes
Connect with verified EnBright professionals (builders and installation partners) who quote on your specific upgrade plan. No cold calling. No vague estimates.
Formal NatHERS assessment
Want your official star rating certificate for rebates, lenders or resale? Book an accredited NatHERS assessor through EnBright for a precise, government-recognised rating.
Your Assessment Report
Not just a number. A complete action plan.
A formal NatHERS assessment report gives you everything you need to understand your home's performance, access rebates, and take confident next steps.
Official Star Rating Certificate
Your home's current NatHERS star rating, recognised by lenders, government rebate programs, and real estate agents as the standard measure of residential thermal performance.
Zone-by-Zone Performance Breakdown
A detailed analysis of how each element (roof, walls, windows, floor, air sealing and orientation) is contributing to or dragging down your overall star rating.
Upgrade Scenario Modelling
Specific upgrades modelled against your actual home, showing exactly how many stars each upgrade adds and what it's estimated to cost, so you can prioritise intelligently.
Projected Energy Savings
Annual energy bill savings projections based on your local climate zone, current energy prices, and modelled post-upgrade performance.
Eligible Rebates & Incentives
A summary of federal and state government rebates you're eligible for based on your current rating and planned upgrades.
NatHERS Assessment Report
123 Example Street, Melbourne VIC
Performance by zone
Common Questions
What homeowners ask us.
What's the difference between the calculator and a formal assessment?
The EnBright Calculator gives you a fast estimate based on your answers. That's enough to plan upgrades, compare options, and get quotes from professionals. A formal NatHERS assessment involves an accredited assessor visiting your home to precisely measure and model it, producing an official star rating certificate recognised by lenders and government rebate programs.
Do I need a formal assessment to get quotes?
No. Your EnBright Calculator results are enough to start requesting quotes from our verified professionals. A formal assessment is only required when you need the official NatHERS certificate, for rebate applications, green home loan documentation, or resale purposes.
How accurate is the calculator?
The EnBright Calculator uses your home's construction details, location and climate zone to generate an estimated NatHERS star rating and savings projections. It's a reliable planning tool. Not a substitute for the precision of an on-site accredited assessment, but accurate enough to guide your upgrade decisions.
Will a formal assessment qualify me for government rebates?
In most cases, yes. An accredited NatHERS assessment is typically required documentation for state and federal energy upgrade rebate programs. Your report will identify which rebates and incentives apply to your home and planned upgrades.
What happens after I get my calculator results?
You'll see your estimated star rating, a prioritised list of upgrades with cost and savings estimates, and the option to request quotes from verified EnBright professionals in your area. You can also book a formal NatHERS assessment if you need the official certificate.
Find out where your home stands.
Try the EnBright Calculator. Get your estimated star rating, upgrade options and cost estimates in under 5 minutes.