The home designs of Lot Owners are assessed against the Building Standards using the Design Assessment Scoresheet .
The Scoresheet measures the resources that a NEV dwelling uses, and considers the house energy emissions and water consumption in a similar manner to the 2004 BASIX benchmark, but seeks an initial reduction of estimated consumption that is less than 70% of the BASIX 2004 benchmark for both. Goals for each category in the Scoresheet are provided in Table 1 of the NEV Building Standards.
Scoresheets may be filled out by either the lot owners, the lot owner’s design consultants or by a Nev Registered Assessor. The Lot Owner is responsible for any cost incurred in completing the NEV Scoresheet.
The scorecard includes 3 ratings that new homes must achieve. They are:
At least a 7-stars NatHERS rating for building thermal performance.
Reduce water consumption through installation of the highest rated WELS tap.
This requirement will be assessed using BASIX (which is the Department of Planning and Environment’s building sustainability index tool used by all local Councils when approving housing developments in NSW). Our Building Standards, however, will require 40 points to be achieved earlier in the assessment process than is generally required in a BASIX assessment.
Energy generated by a home exceeds annual average consumption.
Typically, solar photovoltaic panels (PV) will be used by home owners at Narara to generate power. To meet mandatory requirements, we call for PV sets to be sized at 2 kWp for the first bedroom and 1kWp for each additional bedroom.
Compliance with these 3 requirements will yield home designers 37 points on our assessment scorecard.
With 37 points achieved through designing in the mandatory performance items, the home designer then needs to achieve a further 33 points to reach the minimum targeted score of 70 points. The additional points are attained by adopting design strategies supported by the option matrix provided in the Design Assessment Scoresheet. Many options and combination of options are supported by the scoresheet, a tab on the scoresheet tilted Options provides a detailed list, and Lot Owners are encouraged to discuss with their designer the elements that best suit their requirements. Some, though not all, of the available options are presented below:
More bedrooms and smaller homes
Appropriate selection of construction materials
Reduce embodied energy in house construction.
Using sustainable materials such as mud-brick, straw bale and cob etc.
Avoiding material with high human health impact such as VOC paints and PVC piping.
Adding more than the mandatory number of solar photovoltaic panels.
Selection of high star rated appliances (clothes dryers, air conditioners for example) or not having them at all.
Managed energy consumption to reduce peak loads.
Management waste during both home construction and after construction.
Maximising the home’s environment quality through solar access and cross ventilation.
Livability considerations such as permitting disability access in the future.
Bonus points have been built into the scorecard to account for the fact that some home owners may have difficulty in reaching 70 points because, for example, the NatHERS star rating system does not recognise innovations such as earth-ship construction, food production, water tanks and composting toilets.
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