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Energy Ratings

House Energy Rating

Home Energy Efficient Housing

Renovating or building a new home provides the perfect opportunity to make your home as comfortable as possible plus you can save money and the environment!

How ? By making your home energy efficient.


In fact, from this year every new home throughout Australia needs to comply with the new regulations to improve energy efficiency, as called-up in the Building Code of Australia (BCA). These initiatives have been introduced to improve the energy efficiency of new homes and extensions, and to help curb the growth of greenhouse gas emissions to protect our environment and safeguard Australia's future.


In every aspect, an Energy Smart Home looks just like any other. However, it utilises a combination of building orientation,  insulation, efficient heating, cooling, hot water, lighting and appliances to reduce household energy consumption by up to 40%.


One of the easiest ways to make your home more energy efficient, whether it's new or existing, is through the use of insulation, as it provides a barrier to the flow of heat into and out of your home. A well insulated home is up to 10 degrees warmer in winter and up to 7 degrees cooler in summer and can save as much as $500 per year in reduced energy costs.


When choosing insulation, the most important factor to consider is its R-value. The R-value is a measure of the material's resistance to heat flow, and therefore its performance. The higher the R-value, the greater the resistance to heat transfer, and the greater the energy savings or in our words THE FATTER THE BATT THE BETTER!

Australian Standards recommends different insulation levels for different locations, based on climatic differences as well as energy and insulation costs.  

Benefits of living in an energy efficient home


  • Saves money on energy costs - up to $500 per year.
  • Stays naturally warm in winter and cool in summer.
  • Appliances work more efficiently.
  • Improved re-sale of your home.
  • Pays for itself in 3-4 years.
  • Reduces the impact on the environment.
  • Reduces the use of non-renewable resources



Energy Ratings for NEW homes.


6 STAR Energy Ratings for NEW and Existing homes.


Gerster Insulation can provide expert advice on energy efficiency ratings for builders, private home owners, developers and architects. We can help you with any queries or concerns you are having with the insulation requirements of your building.

The 6 Star Standard applies to the thermal performance of a home, renovation or addition and applies to your home’s building envelope – its roof, walls, floor and windows. Minor building works, not requiring a building permit, will not be affected by the regulations.

Meeting 6 Star compliance is not difficult : it’s about good design, particularly at the planning stages. So talk to your building practitioner early to take advantage of the benefits, such as increased comfort, saving money on energy bills and making your home more resilient to climate change. Carefully selecting your site so your home’s orientation takes advantage of solar energy can add up to 1 Star to the rating.


6 Star homes are projected to use 24 percent less energy through heating and cooling compared to 5 Star homes. This will see Australians with 6 Star homes potentially saving a further $100 off their energy bills each year. This is only an average saving, with residents who use their energy features in their home wisely saving even more.
Some pointers in creating an energy efficient home.


Energy efficient homes are more comfortable to live in, cheaper to run and less harmful to the environment - below are some of the factors that you must take into account when designing your new home or updating your existing home to make it more energy efficient.


  • Building orientation
  • Window placement, sizing and shading
  • Use of insulation
  • Ventilation and draught proofing  
  • Room layout
  • Building materials
  • Landscaping
  • Energy efficient appliances



The cost will vary depending on the size of your home and the choices you make to get your house energy efficient. Please contact us to find out more.  


Energy Audit - Existing Homes

Energy rating history

In 1991 mandatory insulation came in to regulation. To accommodate this new development NatHERS software developed by the CSIRO, has been adopted throughout Australia to help develop energy efficient homes. Design changes alone can reduce heating and cooling energy costs by up to 40 percent.

Peter Gerster was one of the first insulation industry leaders to use the CSIRO NatHERS Energy rating software in 1991.

Improve the energy rating of your home - save $$ on energy, be more comfortable, save on greenhouse gas emissions and improve the value of your home. Our assessor will visit your home and will complete a detailed report on where you can make your home more energy efficient and advise you on the costs and availability of the products recommended.

An energy audit takes into account :

Insulation: We will check current insulation levels in ceilings, walls (if possible), under floor. Improving wall, ceiling and under floor insulation is one of the most effective ways to save on heating and cooling costs and will give years and years of increased comfort, also insulating hot water pipes will save energy.

Draft sealing: of doors, windows, wall vents, skylights, chimneys, downlights, self sealing exhaust fans, ventilation above fridge and microwave.

Window furnishings: updating your internal and external blinds, curtains and pelmets, venetians and verticals is another way to make you home more energy efficient.

Lighting: install energy efficient compact fluorescent bulbs they last up to eight times longer than ordinary bulbs and use 80% less energy than downlights, batton.

Appliances: Water saving appliances eg Low flow Shower heads, heating, cooling, ducts (ceiling/floor), hot water (electric/gas) insulation covers, solar hot water and
Thermostat levels record. Turn off appliances at the wall saving up to 100kg of greenhouse gasses per year.


  • Ventilation: Whirly birds, ceiling fans etc.
  • Window frame type: timber, aluminium, pvc etc
  • Window glass type: single, double glazing.
  • External wall type: bricks, weatherboard or cladding.
  • Roof type: flat or pitched, colourbond, tiles, shingle or slate.
  • Overshadowing: of trees, properties, East & West
  • Floor coverings: tiles, timber, carpet or vinyl
  • Verandahs: overhang / shading
  • Water: Waste water and recycling


How you will benefit.

  • Reduce bills by 30- 45%
  • Keep house cooler in summer
  • Keep house warmer in winter



The cost will vary depending on the size of your home and the choices you make to get your house energy efficient. Please contact us to find out more.