BASIX Alterations & Additions Assessments
Planning a renovation, extension or upper-floor addition in NSW?
If the work is valued at $50,000 or more (or includes a pool or spa over 40,000 litres), a BASIX certificate is required.
AENEC specialises in BASIX assessments for alterations and additions. We carefully evaluate the new and altered parts of your project — including walls, floors, ceilings, roofs, windows and services — to ensure compliance with current NSW energy, water and thermal comfort requirements.
What our BASIX Alterations & Additions service includes:
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Assessment of all new and modified building elements
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Thermal comfort modelling where required
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Energy and water efficiency commitments tailored to the scope of works
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Practical recommendations that help you meet targets without unnecessary cost
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Clear documentation ready for council submission
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Guidance on design improvements that protect your budget and design intent
Unlike a full new-dwelling assessment, we focus only on the changes being made, making the process efficient and relevant to your renovation or extension.
With more than 15 years of experience and a very high success rate on council submissions, AENEC helps architects, builders and homeowners achieve smooth, cost-effective BASIX compliance for alterations and additions.
Need a BASIX certificate for your renovation or extension?
Contact us today for a tailored fee proposal.

