Energy Rating Reports

ENERGY RATING REPORTS

What You Need to Begin an Energy Rating Assessment

To kick off a Thermal Performance Assessment (also known as an Energy Rating Report), we’ll need a complete set of architectural plans. These typically include:

Site plan
Floor plans
Elevations and sections
Window and door sizes or a schedule (not necessary for Prelim or townplanning)

Plans can be submitted in PDF. Once received, we model the dwelling using HERO software to assess its thermal performance under NCC 2019 or 2022 requirements.

What You Receive from Zawirate

Every assessment includes:

A preliminary report to show you what is required for compliance
Advice to help you reach compliance cost-effectively within what your looking for
A final certified Thermal Performance Assessment and stamped plans ready for submission

We work collaboratively with designers and builders to ensure solutions are practical and aligned with your project goals.

What Does A High Performing Star Rating Mean?

A high performing star rating reflects how efficiently a home maintains comfortable temperatures year-round with minimal reliance on heating or cooling systems. It’s calculated based on:

Heating and cooling loads
Climate zone (based on postcode)
Site orientation
Construction materials
Ceiling heights, window types, and footings
Impact of neighbouring structures

For extensions, we assess both the existing dwelling and proposed works using the Deemed-To-Satisfy (DTS) method.

Why Is an Energy Rating Report Required?

In Victoria, all new homes, additions, and alterations must meet (depends on the date of issue) a 6-star minimum or 7-star minimum to obtain a building permit. This requirement is enforced by the Building Commission and your building surveyor.

Importantly, the rating is based solely on the building’s design and structure — fixtures like air conditioners, taps, and shower heads are not included in the calculation.