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BASIX Alterations + Additions . June 2006. Alterations & Additions policy. Objective: To require renovations to include practical measures that will reduce greenhouse gas emissions and potable water consumption. Alterations & Additions policy. Will operate as part of the existing website;

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Alterations & Additions policy


To require renovations to include practical measures that will reduce greenhouse gas emissions and potable water consumption.

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Alterations & Additions policy

  • Will operate as part of the existing website;

  • Sets simple, specific conditions, based on the intended work;

  • Only applies to the sections of the home that are being renovated;

  • Relevant BASIX commitments must be shown on plans

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Existing Policies

BASIX will override all energy and water efficiency policies presently applied to residential development by councils. For example:

  • Requirements for raintanks, solar water heaters;

  • Insulation and shading requirements;

  • Existing Energy Smart Homes policy components.

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What it means for Councils

  • Ensure BASIX Certificate accompanies BASIX-affected Alterations and Additions DAs/CDCs;

  • Check plans for appropriate marking of BASIX commitments:

    • Rainwater tank – with size stated

    • Pool / spa covers

    • Pool / spa pumps and heating systems

    • Water heater type

    • Lighting

    • Added insulation, glazing, shading

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What it means for Councils

  • Ensure BASIX commitments delivered at construction stage, evidenced

    • by visual inspection and/or;

    • third-party certification.

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Examples of projects that will require a BASIX Certificate (assuming a DA or CDC is required):

  • Extensions of living areas, bedrooms, bathrooms, kitchens;

  • New living areas, bedrooms, bathrooms, kitchens, on a dwelling site (eg. a new, freestanding enclosed pavilion);

  • Modifications to the building fabric of an existing dwelling;

  • New swimming pools and/or outdoor spas;

  • New hot water systems.

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It is NOT the intent to require a BASIX Certificate for the following:

  • New garages or carports

  • New structures that cannot be fully enclosed, e.g. gazebos

  • New pergolas, verandahs or shading devices such as awnings, where they are the only development proposed

  • DA/CDC for only a solar hot water system

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How will it work?

The user enters relevant project details

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How will it work?

BASIX provides prescriptive requirements for Water, Energy and Thermal Comfort – there areno targets;

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How will it work?

Once all requirements have been met, a BASIX Certificate can be printed;

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Plan Marking

BASIX requirements must be marked on plans:

  • Insulation types/R-Values;

  • All wall, floor, ceiling and roof construction types;

  • All glazing and frame types;

  • Shading devices and overshadowing objects;

  • Raintanks – location and capacity in litres;

  • Rainwater/stormwater collection areas in m2;

  • Hot water system type and location;

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Pools + Spas

  • Average pool size in NSW is 48,700 litres;

  • Homes with pools have an additional 10% water consumption above the average;

  • Increased water usage is due to evaporation, splash and backwash;

  • Increased energy usage isdue to pool pump and heating;

  • NSW Health supports rainwater tanks for topping up swimming pools.

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BASIX requirements are set depending on pool type and location. They may include:

  • Filter pump timer

  • Cover

  • Shading

  • Rainwater tank for top-up

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Rainwater tank size varies according to:

  • Location / climate

  • Pool size

  • Roof catchment area

  • Heating type

  • Use of cover

  • The tap must be within 10 metres of the pool;

  • For large, unheated pools, installing a cover and/or shading will reduce rainwater tank size.

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    Minimum requirements:

    • 3* for new basin taps (excluding bath and laundry), showerheads, and toilets;

    • Rainwater tank for new pool/outdoor spa in most locations;

    • Pool cover if pool is heated.

      Raintank size required is determined by:

    • Roof capture area;

    • Location;

    • Installation of pool heating;

    • Installation of a pool cover.

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    Proposed minimum requirements:

    • Lights must be energy efficient (e.g. fluorescent);

    • Solar, heat-pump, gas storage or gas instantaneous hot water systems if being replaced;

    • Day/night zoning for new A/C system;

    • Timer on pool filter pump;

    • Electric resistance pool heating not permitted.

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    Thermal Comfort

    • Insulation required for new:

      • Suspended floors;

      • External walls;

      • Ceilings;

      • Roofs, if they are dark or medium colour.

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    First Floor Addition – North coast climate zone

    To pass:

    3* for new basin taps and showerhead in bath

    Energy efficient lighting

    New hot water system - solar

    Day/night zoning for new A/C system

    Insulation in new external walls, ceilings and roof

    750mm eaves on north

    750mm eaves plus toned glass to E & W – bed 2, or external louvres with clear glass

    3m roof overhang to W bed 3, therefore no toned glass

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    Sustainability Unit,

    NSW Department

    of Planning

    BASIX Help Line

    1300 650 908

    [email protected]