Make your renovations green

Renovations are the ideal opportunity to make your house more efficient and sustainable. Try these tips and feel good about your home.

From the design through to the construction of your renovation, opportunities exist to lighten your environmental footprint. These changes can range from short-term aspects (e.g. safely managing and recycling building waste) to long-term improvements in the energy efficiency of your home.

If you’re renovating, explore good design: it can save energy, water and money, while creating a more pleasant living space that’s also better for your health.

How to do it now!

Every house is different, so the specific ways you can reduce the environmental impact of your renovation and energy use will be different in each case. However, we can offer the following areas of focus and ideas to assist you in crafting a green renovation:

  • Working with Sustainable Design Experts
    Passive design
    Water use and re-use
    Energy efficiency, capture and use
    Materials selection, use and re-useMinimisation of construction waste

    Working with Sustainable Design Experts

    Collaborating with professionals who specialize in sustainable design can ensure that your renovation project aligns with eco-friendly principles. Home extension designers with experience in sustainable, energy efficient design, can help you plan and execute renovations that maximize natural light, improve energy efficiency, and utilize sustainable materials. Their expertise can guide you through the process of creating a home that is both beautiful and environmentally responsible.

    Passive Design

    Passive design uses the physical orientation of your house and an understanding of the seasonal weather patterns to design a space that requires minimal heating or cooling to be comfortable all year round. Passive design elements include orientation, insulation, double glazing, thermal mass and airflow.

    For example, you might open up the north face of your living space to the winter sun to heat a concrete-slab floor or wall. This utilises orientation and thermal mass to make your house better at capturing and holding heat.

    According to the Australian Greenhouse Office, approximately 30 per cent of our household energy bills could be eliminated through intelligent (passive) heating and cooling techniques.

    Water Use and Re-use

    Renovations provide a unique opportunity to re-engineer your plumbing to suit the water-scarce world in which we live. The specific design of your water system would depend on your needs and the rainfall in your area.

    If we look at the four types of water we generally have available, the options for a new approach to water use in the home becomes more clear.

    • Mains water

      A clean, reliable and chlorinated source of potable (drinkable) water.

    • Rainwater

      Can be used as a chlorine-free supply of freshwater for use in the home washing machine and flushing toilets and in the garden to keep those vegetables growing. Contact a local plumber for rainwater tank installation and sizing.

    • Greywater

      If treated, it can be used to flush toilets, water gardens and even to wash clothes.

    • Blackwater

      Blackwater (toilet water) requires biological or chemical treatment and disinfection before re-use. This can be done in your backyard – but you will need to get the right advice and the right system to avoid any health risks.

    A water system could be designed to capture all available rainwater for use in washing, toilet flushing, and the garden, thereby significantly reducing dependence on mains water. This eco-friendly system not only conserves water but also lowers utility bills over time. Water exiting the bathroom could be further utilized to flush toilets and irrigate various parts of the garden, ensuring that every drop is put to good use. In this sustainable model, mains water would serve as a reliable back-up for the rainwater supply during periods of low rainfall, ensuring uninterrupted water availability. Such innovative bathroom renovations can range from $10,000-$40,000, depending on the complexity and scale of the systems installed. This investment not only enhances the functionality and sustainability of the home but also adds significant value to the property by incorporating advanced water-saving technologies.

    According to the Australian Greenhouse Office, such a model could reduce most household consumption of mains water by approximately 80 per cent.

    Energy Efficiency, Capture and Use

    Most houses in Australia have sufficient raw energy – in the form of sunlight hitting them daily – to supply all the energy needs of the house and its inhabitants.

    The requirement to heat, cool and light our houses can be all but eliminated through the deft application of passive design principles.

    The requirement to heat water and power household appliances can then be met with solar hot water and grid-connected solar photovoltaic systems. These systems harness the sun currently hitting your roof to heat your water and supply your electricity.

    If we look at the make-up of energy use in the average Australian home we can see where a renovation can reduce or eliminate costs and associated greenhouse gas emissions.

    • Space heating/cooling (33 %)

      Good design can eliminate the need to heat or cool our homes except in the most extreme weather.

    • Lighting (5 %

      By looking at how we use our living space, we can design it to be lit with natural light during the day.

    • Electrical appliances (12 %); standby energy use (1 per cent); refrigeration (9 %); cooking (4 %)

      Purchasing energy efficient appliances and fixtures should save both energy and water daily. 

    • Water heating (25 %)

      Installing a solar hot water system in your renovation would cut your energy requirements by over 80 per cent. See our Install solar hot water action.

    It can be seen from these figures that, if we were more energy-efficient, we could reduce the average household energy demand by more than 50 per cent. Further, the energy we do need could be met through the installation of a photovoltaic system.

    Materials Selection, Use and Re-use

    Understanding the lifecycle of the materials we use and their potential impact on our health and the environment enables us to select products that are better for us and the planet.

    Select building materials with the least environmental impact
    The following list provides a common-sense guide to choosing your materials with the environment in mind:

    1. Re-use existing materials from any demolition (this also minimises waste).
    2. Use recycled materials and those with minimal environmental impact.
    3. Use renewable resources (for instance, wood from sustainably managed forests).
    4. Design for an extended lifespan (aim for over 100 years).
    5. Design and build for de-construction, re-use, adaptation, modification and recycling.
    6. Minimise the distance materials travel and select materials that assist passive-design heating and cooling of the house.

    Avoid building materials that leak toxic chemicals
    Paints, composite wood, glues, carpets and many other building products can contain high levels of toxic chemicals (formaldehyde, benzene, trichloroethylene, etc). These chemicals are released slowly and contribute to ‘Sick Building Syndrome’, which causes symptoms ranging from allergies, headaches and fatigue through to nervous-system disorders, cancer and death. Seek equivalent products that don’t contain these chemicals.

    Minimise Construction Waste

    With up to 40 per cent of all waste coming from building sites, it will save the environment (and your dollars) to minimise the waste coming from your renovation in some of the following ways:

    • Re-use existing building materials in the construction.
    • Recycle material that you cannot use. Ensure that the people building your home separate and recycle all waste coming from the renovation including masonry, concrete, wood and metals.

    See our Recycle Building and Construction Waste action for more information on recycling and recycled building materials.

    The following websites provide some great information:

    Why is this action important?

    When we build or renovate our homes we determine the consumption pattern of that structure for the many decades of its life. It’s a unique opportunity to make structural improvements to the efficiency of our homes and reduce their ongoing drain on the environment. Investing time, energy and money at this stage will give environmental and financial rewards for years in terms of reduced energy and water use and increased health and wellbeing.

    Environment

    Renovations offer the opportunity to ‘hardwire’ efficiencies into your home that will allow you to reduce energy and water use over the next decades of its life.

    Wellbeing

    Creating thoughtful and well designed living spaces that use light, aspect and materials to bring them into sympathy with our environment is a recipe for a great home. Renovating your space in a way that avoids toxic chemicals and does not contribute to the decline of our planet will make you smile for years to come. And rightfully so…

    Sustainable living guide