If you’re dusting off architectural plans from a few years ago, be warned: the goalposts in NSW haven’t just moved—they’ve been completely replaced. To align with the NCC 2022 standards, the mandatory Building Sustainability Index (BASIX) rating has jumped from an average of 5.5 to a strict 7-star minimum.

At JJ Drafting, we are seeing more and more “off-the-shelf” designs fail the new Thermal Comfort and Energy targets. Here is what has changed and how to ensure your 2026 build actually gets the green light.

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1. The Death of the “Standard” Window

In the past, you could often pass BASIX with standard single-glazed aluminium windows if you added extra insulation in the roof. Those days are over.

• The 7-Star Reality: Achieving compliance now almost always requires High-Performance Glazing. This doesn’t just mean “Double Glazing”; it means selecting specific U-values and Solar Heat Gain Coefficients (SHGC) tailored to each side of your house.

• The Strategy: We use Passive Solar Orientation—positioning your living areas to capture winter sun while using eaves and shading to block the brutal summer heat.

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2. Thermal Bridging: The “Steel Frame” Problem

Many Northern Beaches and rural NSW homes use steel frames for termite and fire resistance. However, steel is a high-performance heat conductor.

• The Problem: Without a “Thermal Break,” your steel studs act as bridges, sucking heat out of your home in winter and pouring it in during summer.

• The “Grit” Fix: We specify specialized Thermal Breaks and R2.2+ wall insulation to ensure your 7-star rating isn’t compromised by your structural choices.

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3. Beyond Insulation: The New Energy Targets

BASIX 2026 isn’t just about keeping the heat in; it’s about reducing your total carbon footprint.

• Hot Water Shift: Electric resistance heaters are out. To hit the new targets, you typically need Heat Pump technology or a high-efficiency Solar Hot Water system.

• The “Materials Index”: For the first time, we now have to record the Embodied Emissions of your building materials. Choosing low-carbon options isn’t just “green”—it’s becoming a regulatory necessity.

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4. Why an “Energy Rater” Isn’t Enough

Most people hire a separate rater after the design is finished. This is the wrong order. If the design is fundamentally flawed (e.g., too much west-facing glass), no amount of expensive insulation will fix it.

The JJ Drafting Advantage: We integrate BASIX compliance into the Drafting Phase. We model the “Energy Value” of your home while we are still drawing the walls, saving you thousands in late-stage redesign fees.

FAQ 

• Question: Is double glazing mandatory for 7-star BASIX in NSW?

• Answer: While not strictly “mandatory” by law, it is becoming practically essential for most designs to meet the 7-star thermal comfort targets, especially for homes with large windows or poor orientation.

• Question: What is the minimum lot size for 7-star BASIX?

• Answer: BASIX applies to all new residential builds regardless of lot size. However, the targets vary based on your climate zone and the total floor area of the dwelling.

• Question: Can solar panels help me pass the BASIX Thermal Comfort target?

• Answer: No. Solar panels help you pass the Energy target, but they do not affect the Thermal Comfort (stars) rating. Thermal comfort is strictly about the building “envelope”—insulation, glazing, and orientation.