The increased danger of depleting our resources and facing numerous environmental issues has forced many homeowners to look for helpful ways to minimize their bills as well as their carbon emissions.

One of the greatest assets towards achieving this goal is the NatHERS Certificate. It measures the efficiency of energy consumption in residential structures and serves as a guide toward achieving efficient home design in Australia.   

If you are building a house, planning on selling or renovating the property, knowing a thing or two about the NatHERS (Nationwide House Energy Rating Scheme) system should be helpful to you.

This guide will cover everything you need to know about NatHERS certificates, their uses, their types, costs, and practical tips to cater to Sydney homeowners.

What is a NatHERS Certificate?

NatHERS Certificate is a legitimate document stating the energy performance of any residential building based on zero to ten stars. In other words, a higher rating means less energy is used for heating and cooling the house so less money is spent on energy bills in a household, more comfortable. 

In other words, a higher rating means less energy is used for heating and cooling the house, so less money is spent on energy bills in a household, and it is more comfortable

This rating is determined through a NatHERS Assessment that considers:

• insulation levels,
• window positions,
• building materials, and
• regional climate.

Implemented by the Australian government, NatHERS was put in place to ensure that Aussie homes meet minimum standards of energy performance.

For example, new homes are expected to achieve no less than a 6-star rating nationally. However, there are some states that have higher minimum cutoff scores.

The assessment is conducted using accredited software tools like AccuRate, BERS, or FirstRate5, which simulate the home’s energy performance year-round.

What Are NatHERS Certificates Used For?

Compliance with Building Codes

Energy Efficiency Certificates like NatHERS and BASIX are mandatory for new residential constructions and major renovations in Australia. It proves the design meets the National Construction Code’s energy efficiency requirements, ensuring regulatory approval.

Informing Buyers and Renters

Similar to a car’s fuel economy sticker, the NatHERS score is a tool that helps prospective buyers or renters estimate a home’s long-term energy expenditure.

Similar to how the HERS index influences house resale cost in US, higher ratings generally reflect higher values for homes and higher cost of ownership.

Accessing Incentives

Some state governments and lenders offer rebates or green loans for high-efficiency homes. For example, Victoria’s Home Energy Efficiency Program provides subsidies for upgrades guided by NatHERS assessments.

Design Optimisation

Architects and builders use NatHERS ratings during the planning phase to tweak designs, such as adjusting roof angles or window glazing, to maximise energy savings before construction begins.

Types of NatHERS Certificates                

Not all certificates are created equal. The legitimacy of a NatHERS rating depends on who conducts the assessment:

Coloured Certificate with NatHERS Logo

This certificate is issued by a NatHERS-accredited assessor, ensuring the rating meets strict government standards.

Accredited assessors undergo rigorous training and use approved software to model energy performance.

The coloured logo guarantees the assessment is recognised by councils and regulatory bodies, making these energy efficiency certificates essential for compliance and resale.

Black and White Certificate with NatHERS Logo

Produced by non-accredited assessors, these energy efficiency certificates lack official recognition.

In many states, it isn’t compulsory for assessors to be NatHERS accredited.  They provide a rough estimate of energy performance.

Homeowners risk non-compliance or legal issues if relying on this type for permits in the states where a NatHERS certificate with accredited assessors is necessary.                

NatHERS Certificate Cost

The NatHERS Certificate cost varies based on property size, design complexity, and location. In Sydney, expect to pay between 300-800 for a certified assessment by an accredited professional.

Factors influencing price include:

• Home size: Larger homes require more detailed modelling.
• Design features: Complex layouts or custom materials extend assessment time.
• Assessor expertise: Highly rated professionals may charge premiums.

While this might seem steep, the long-term savings from optimised energy use—and potential incentives—often justify the investment. 

You can hire NatHERS certificate Sydney experts to get your development NatHERS accredited.

How to Get a NatHERS Certificate in Sydney?

Find an Accredited Assessor

Use the NatHERS Accredited Assessors directory to locate professionals in Sydney. Ensure they’re certified under the Australian Building Sustainability Association (ABSA).

Prepare Your Plans

Provide floor plans, elevation drawings, and material specifications. The assessor will input these into simulation software.

Review the Report

The final certificate includes the star rating, energy load breakdown, and recommendations for improvement.

Frequently Asked Questions

Q: How long does a NatHERS Assessment take?

Typically 1–3 days, depending on the home’s complexity. Smaller or straightforward designs may be processed faster, while custom builds with unique features (e.g., skylights or thermal mass materials) require more detailed modelling. Delays can occur if architectural plans are incomplete or revisions are needed.

Q: Can I improve my home’s NatHERS rating after construction?

Yes! Retrofitting insulation, double-glazed windows, or solar panels can boost your score. For older homes, sealing gaps in doors/windows or upgrading to energy-efficient HVAC systems also helps. Consult a Nathers-accredited assessor for tailored advice on cost-effective upgrades.

Q: Is a 6-star rating sufficient?

While it meets minimum standards, aiming for 7–8 stars significantly cuts energy bills. Higher ratings future-proof your home against rising energy prices and may qualify for additional rebates. In Sydney, many builders now target 7+ stars to appeal to eco-conscious buyers.

Q: Are there penalties for non-compliance?

Yes. Councils may withhold occupancy certificates or impose fines for unrated homes. Non-compliance can also delay project timelines or reduce buyer confidence if selling. Always verify your assessor’s accreditation to avoid legal or financial setbacks.

Conclusion

A NatHERS Certificate isn’t just paperwork—it’s a roadmap to a cheaper, greener home. By choosing an accredited assessor and aiming for higher star ratings, Sydney homeowners can future-proof their investments against energy price hikes and climate challenges. 

Be it from the ground up development on residential land or refinishing your existing home, energy efficiency always makes a great financial as well as eco-friendly bet.

Ready to take the next step?

Call a NatHERS accredited assessor now to book your NatHERS assessment and discover the potential in your home. Eco Certificates provide NatHERS, BASIX and NABERS assessment services.