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The home desig= ns of Lot Owners are assessed against the Building Standards using the NEV = Design Assessment Scoresheet. This is provided to owners in their lot folde= r and can be downloaded from the "Useful reports and tables" section in the= Wiki.
The Scoresheet measures the resources that a NEV dwelling uses, and cons= iders the house energy emissions and water consumption in a similar manner = to the 2004 BASIX benchmark, but seeks an initial reduction of estimated co= nsumption that is less than 70% of the BASIX 2004 benchmark for both rather= than the 40% mandated under NSW building regulations.
The goals for each category in the Scoresheet are provided in Table= 1 of the NEV Building Standards.
The Design Assessment Scoresheet may be filled out by either the lo= t owners, the lot owner=E2=80=99s design consultants. The Lot Owner i= s responsible for any cost incurred in completing the Scoresheet.
The scorecard includes 3 ratings that new homes must achieve. They= are:
At least a 7-stars NatHERS rating for building thermal performance.<= /p>
Reduce water consumption through installation of the highly rated wa= ter efficiency taps and showers.
This requirement will be assessed us= ing BASIX (which is the Department of Planning and Environment=E2=80=99s bu= ilding sustainability index tool used by all local Councils when approving = housing developments in NSW). Our Building Standards, however, will r= equire 40 points to be achieved earlier in the assessment process than is g= enerally required in a BASIX assessment.
Energy generated by a home exceeds annual average consumption. =
Typically, solar photovoltaic panels (PV) will be used by home owner= s at Narara to generate power. To meet mandatory requirements, we cal= l 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 i= tems, the home designer then needs to achieve a further 33 points to reach = the minimum targeted score of 70 points. The additional points are at= tained by adopting design strategies supported by the option matrix provide= d in the Design assessment scoresheet. Many options and combination of opti= ons are supported by the scoresheet and Lot Owners are encouraged to discus= s 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 et= c.
Avoiding material with high human health impact such as VOC paints a= nd PVC piping.
Adding more than the mandatory number of solar photovoltaic panels.<= /p>
Selection of high star rated appliances (clothes dryers, air conditi= oners for example) or not having them at all.
Managed energy consumption to reduce peak loads.
Management waste during both home construction and after constructio= n.
Maximising the home=E2=80=99s environment quality through solar acce= ss and cross ventilation.
Livability considerations such as permitting disability access in th= e 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 becau= se, for example, the NatHERS star rating system does not recognise innovati= ons such as earth-ship construction, food production, water tanks and compo= sting toilets.
CATEGORY |
SUB-CATEGORY |
GOAL |
MEASUREMENT CRITERIA |
INITIAL VILLAGE MINI= MUM* |
---|---|---|---|---|
Water |
Potable Water Usage |
Conserve drinking water from NEV dam |
Water efficient devices; Water effective land= scaping & gardens; Use of recycled water in house; Strategies for high = water demand features e.g. irrigation |
70% reduction |
Stormwater Greywater & Black-Water Manage= ment |
Conserve drinking water; reduce stormwater, g= reywater, blackwater; consume recyclable surplus |
Water Sensitive Urban Design (WSUD); how stor= mwater is harvested; ponds; rain gardens; infiltration systems; buffers inc= l. water tanks; swales; waterless toilets |
70% reduction |
|
Energy |
Thermal Performance |
Decrease Energy usage |
Passive solar house design considering orient= ation, windows, insulation, thermal mass, shading and ventilation |
7 stars=E2=80=99 minimum**= p> |
Energy |
Other Energy Usage |
Decrease Other Energy usage |
Heating & cooling methods; Hot water unit= s; Appliances; Lighting (type, flexibility & optimizing); Standby power= usage; Clothes drying |
70% reduction |
Renewable Energy |
To at least meet annual demand |
Photovoltaic panels |
At least meet annual demand<= /p> |
|
Peak Power Demand |
Reduce summer and winter peak loading |
Standby switches/ power boards; Energy monito= ring system; Basic control system e.g. timer; Remote control system through= the Smartgrid App; Separate circuits for non-essential appliances; load sh= ifting by Electricity Provider; have PV plus battery system; surplus renewa= ble energy above that required to meet the energy demand over the year <= /td> | Points are awarded for these= items |
|
Materials |
Materials |
Lower the health & environmental impact o= f materials for sourcing, production and disposal |
Having a minimum amount of materials; being d= urable; designing for ease of deconstruction at end of building life; low e= mbodied energy; high recycled content; natural and renewable resource mater= ials; low human health impact materials; locally sourced materials |
Points are awarded for these= items |
Waste |
Waste |
Domestic and construction |
Recycle waste streams; reuse and recycling of= construction wastes; design to minimise offcuts & waste with prefabric= ation, using standard sizes etc. |
Points are awarded for these= items |
Indoor |
Indoor Environmental Quality (IEQ) |
Optimum ventilation & acoustics; low poll= utant level |
Daylighting; type of walling, flooring and de= sign for the acoustic consideration of neighbours; low emission materials, = control of mould and condensation |
Points are awarded for these= items |
Innovation |
Innovation |
Foster new ideas |
Owners to demonstrate how elements exceed Cat= egory minimums |
Points can be = awarded if the requirements of other Categories are exceeded |
NB: Any innovative proposals need preliminary= assessment from the BRP at the early design stage. |
||||
Other |
Other |
Adaptability; Resilience; Noise; Livability= p> |
The ease of adapting house for future uses; a= bility to withstand severe external forces including fires; noise control m= easures e.g. pump locations (including heat pumps); Ability to improve acce= ss for occupants over time |
Meet bushfire requirements; = design for low noise |