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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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BASIX Alterations + Additions

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alterations additions policy
Alterations & Additions policy


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

alterations additions policy3
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
existing policies
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.
what it means for councils
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
what it means for councils6
What it means for Councils
  • Ensure BASIX commitments delivered at construction stage, evidenced
    • by visual inspection and/or;
    • third-party certification.

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.

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
how will it work
How will it work?

The user enters relevant project details

how will it work14
How will it work?

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

how will it work16
How will it work?

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

plan marking
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;
pools spas
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.

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

  • Filter pump timer
  • Cover
  • Shading
  • Rainwater tank for top-up

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.

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.

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.

Thermal Comfort

  • Insulation required for new:
    • Suspended floors;
    • External walls;
    • Ceilings;
    • Roofs, if they are dark or medium colour.

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


Sustainability Unit,

NSW Department

of Planning

BASIX Help Line

1300 650 908