Unlock the secrets to a more energy-efficient home with our comprehensive guide to NatHERS assessments including step-by-step processes, cost insights and actionable tips to boost your star rating.
What is included in a NatHERS assessment
A NatHERS (Nationwide House Energy Rating Scheme) assessment involves a thorough evaluation of a home's design and construction to determine its energy efficiency. The assessment considers factors such as the thermal performance of the building envelope, including walls, roof, windows and floors. It also examines the orientation of the house, insulation levels and the type of building materials used.
The assessment is typically conducted using specialized software that simulates the home's energy consumption based on local climate data. The result is a star rating between 0 and 10, with a higher number indicating better energy efficiency. This rating helps homeowners and builders make informed decisions about design and construction improvements to enhance energy performance.
Who can provide a NatHERS rating?
NatHERS ratings can only be provided by accredited assessors who have undergone rigorous training and certification. These professionals use approved software tools to carry out the assessment, ensuring that the results are accurate and compliant with national standards.
In Australia, organizations such as the Australian Building Sustainability Association (ABSA) and the Building Designers Association of Australia (BDAA) oversee the accreditation of NatHERS assessors. Homeowners and builders should ensure that they engage a certified assessor to perform the assessment to guarantee the validity of the star rating.
Costs of NatHERS assessments in Australia
The cost of a NatHERS assessment in Australia can vary depending on the complexity and size of the project. On average, homeowners can expect to pay between $200 and $500 for a standard residential assessment. Larger or more complex projects may incur higher costs due to the additional time and effort required to complete the evaluation.
It's important to consider that the cost of the assessment is a worthwhile investment, as it can lead to significant savings on energy bills over time. Additionally, achieving a higher NatHERS star rating can increase the overall value of the property.
Tips to achieve a higher NatHERS star rating
Achieving a higher NatHERS star rating involves optimizing various aspects of your home's design and construction. Here are some expert tips to improve your rating:
1. Enhance Insulation: Ensure that your home has adequate insulation in the walls, roof, and floors to reduce heat loss in winter and heat gain in summer.
2. Improve Windows: Use high-performance glazing and ensure windows are well-sealed to prevent drafts and improve thermal performance.
3. Optimize Orientation: Design your home to take advantage of passive solar heating by maximizing north-facing windows and minimizing west-facing windows.
4. Seal Gaps: Ensure that all gaps and cracks in the building envelope are sealed to prevent air leakage, which can significantly impact energy efficiency.
5. Use Sustainable Materials: Opt for building materials with high thermal mass and low environmental impact to enhance the overall energy performance of your home.
