Yes, it matters. The BASIX Certificate forms part of your project’s approval documents. The BASIX Certificate is part of NSW performance requirements under the NSW Government’s building sustainability program. Certifiers and councils can cross‑check that the as‑built home matches the BASIX commitments. If on‑site choices deviate (for example, different glazing specifications or missing insulation), you may face delays in obtaining the occupation certificate and could be required to undertake rectification or re‑assessment. When a BASIX Certificate is issued, it includes a set of commitments that must be followed during construction.

Common deviations

• Window specifications changed from those listed in the certificate.
• Insulation R‑values reduced or omitted.
• Shading elements modified or removed.
• Water tank size or plumbing arrangements altered.
• Pool or spa heating specification changed.

What to do if you discover a mismatch

1. Contact Evergreen Energy Consultants with the as‑built details.
2. We review whether performance still meets the required targets.
3. We advise on the best remedy – from minor upgrades to a revised BASIX Certificate.
4. We coordinate with your certifier to keep the process moving.

Preventing problems

• Share the BASIX and NatHERS documentation with all relevant trades.
• Include commitments on construction drawings and specifications.
• If substitutions are proposed, check with Evergreen EC before proceeding.

Why taking it seriously pays off

Addressing variations promptly reduces the risk of costly rework and ensures you can achieve timely sign‑off. Our team supports projects across Sydney, Newcastle, Central Coast and the Hunter Valley to resolve issues efficiently.

Need help with an as‑built variation?

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Written by Evergreen Energy Consultants — accredited BASIX and NatHERS assessors providing residential energy assessments across NSW.