A Comfortable, Low-Running-Cost Home Built on Passive Design, Not Promises

NatHERS (Nationwide House Energy Rating Scheme) measures how much energy a home needs to maintain thermal comfort across the year based on its design, orientation, insulation, and glazing. A 7-star home requires significantly less mechanical heating and cooling than the previous 6-star minimum, which typically translates to lower energy bills and more consistent indoor temperatures across seasons. The actual saving depends on how the home is used, but passive design that achieves a genuine 7-star outcome is noticeably more comfortable to live in than a home that achieves it through specification upgrades alone.

The upfront cost difference depends on how much of the performance comes from passive design decisions (which typically add little to nothing to construction cost) versus upgraded materials and active systems (which do carry a premium). A home that reaches 7-star through good orientation, correctly sized eaves, and appropriate insulation specification will cost less to build than one that reaches the same rating through double glazing on every window and an oversized solar system. CKS Projects identifies the lowest-cost path to the performance target as part of the design process and provides a clear breakdown of the upfront cost and expected long-term saving for each sustainability specification decision.

Northern orientation is the ideal starting point but not the only option. On constrained or awkward blocks, passive performance can be achieved through careful placement of thermal mass, clerestory glazing, courtyard design for cross-ventilation, and selective shading strategies that still capture useful solar gain without the ideal north-facing orientation. CKS Projects assesses each site individually to identify the best passive design response for its specific orientation, not a standard layout that assumes ideal conditions.

Coastal builds in the Illawarra and Shoalhaven require materials that perform in salt air, high humidity, and elevated UV exposure over a fifty-year building life. CKS Projects specifies corrosion-rated cladding systems, powder-coated or stainless steel fixings, durable external timbers appropriate for coastal exposure, and window and door systems tested to the wind and corrosion ratings applicable to the site's distance from the coast and exposure classification. Sustainability in a coastal context means durability first, not just low embodied carbon at the time of construction.

Not necessarily. BASIX energy targets can often be met through insulation, efficient hot water systems, and good passive design without requiring rooftop solar. NatHERS assessments the thermal performance of the building shell, not the energy generation capacity of the property. Solar panels improve your energy balance and reduce grid consumption but are separate from the thermal star rating. CKS Projects advises on whether solar is genuinely cost-effective for your project based on the modelled thermal performance of the building, not as a default recommendation.

Absolutely. Passive design principles, including large north-facing windows, shading eaves, thermal mass in floors and walls, and durable cladding materials, are entirely compatible with contemporary coastal Illawarra architecture. The design decisions that produce good thermal performance typically also produce homes that are open, light-filled, well-connected to outdoor spaces, and visually grounded in their coastal or escarpment setting. The two goals reinforce rather than conflict with each other.