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Low-cost energy efficiency improvements:​ Knowledge base

Save money, improve comfort and create a healthier home

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    Author: CLIVE BLANCHARD

    Clive is an expert on achieving home energy efficiency at low cost so you can save money in comfort.

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How to Choose the Perfect Building Block: Balancing Home Style, Energy Efficiency, and Cost

29/1/2026

 
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Building your dream home starts with a crucial decision: selecting the right block of land for the type of home you want. This choice shapes not only your future lifestyle, but also how energy efficient—and affordable—your home will be.

Step 1: Define Your Priorities—Including Home Type

Begin by clarifying your priorities. Where do you want to live? Inner suburb, outer suburb, broad acreage? Make sure there are the services you need (schools, shops, public transport and other amenities). Consider the distance to your, your partner's and potentially children’s work, both now and in the future. Remember there is often a trade-off between land cost and travel time. The type of land is going to constrain the type of house you build.

What style of home do you envision—a sprawling single-story on a large block, a compact townhouse, or an apartment? This decision often limits how much impact you can have on the design. Are you aiming for a home that’s comfortable year-round with minimal energy bills? Is keeping upfront costs a top concern? Each type has different requirements for block size, shape, and orientation. For example, a wide, shallow block may suit a single-story home, while a narrow, deep block might be better for a two-story design. The style also affects how easily you can incorporate energy-efficient features, such as passive solar gain or natural ventilation.

Step 2: Assess the Site for Energy and Style Potential

Not all blocks are created equal for energy efficiency or for accommodating your preferred home type. Consider:

  • Orientation: Blocks that allow your largest windows to face north (in the southern hemisphere) maximize natural light and passive solar heating, which is ideal for low cost energy-efficient designs. This also usually helps you create an outdoor entertaining area which works with your house layout.
  • Slope and Topography: Near flat land is typically the cheapest to build on. The slope may also influence which home types are feasible—split-level homes, for example, suit sloping blocks.
  • Surroundings: Nearby trees, buildings, or hills can affect both energy performance and the aesthetics of your home. Large objects shading houses from the north will increase the cost of meeting the required energy efficiency rating.
  • Type of build: If you are having a custom home design you have more ability to have a house that utilises the block perfectly, however even if you are constrained to buy a project home, careful selection of both the block and the home can ensure a delightful home.

Step 3: Weigh Up Cost Factors—Style and Site Interactions

Energy efficiency and cost savings go hand in hand, but the type of your home and the characteristics of the block will influence both:

  • Site Preparation: Steep or irregular blocks may be cheaper to buy but can cost more to build on, especially for complex home styles. Simple, rectangular homes are usually more cost-effective to construct on regular, flat blocks.
  • Access to Services: Blocks with easy access to water, electricity, and sewerage reduce connection costs, regardless of home style.
  • Size and Shape: A block that fits your ideal home design without excessive earthworks or wasted space will save money and materials. Particularly if the block is narrow, you need to be thinking of the house design at the same time as choosing the block.

Step 4: Turn Vague Ideas into Action

With so many options, it’s easy to feel overwhelmed. Use a simple three-step sequence:

  1. List your must-haves and nice-to-haves, including home features.
  2. Visit potential sites and assess them against your criteria for both energy and home type.
  3. Consult with a builder or energy assessor early—they can help you spot hidden costs or opportunities for efficiency and style integration.

Step 5: Invest in Expert Advice

Engaging in a concept design process with a professional can help you visualize how your chosen block will perform in terms of energy, cost, and style. If you email me the plans of the block or blocks, I offer a free video consultation to help you see what you need to look for in a comfortable, energy efficient, liveable home for the block. This can prevent expensive mistakes and set you up for long-term savings.

Conclusion

Choosing the perfect building block is about more than location—it’s about setting the stage for a home that’s comfortable, affordable, stylish, and future-proof. By considering your preferred home style alongside energy efficiency and cost from the start, you’ll enjoy lower bills, a lighter environmental footprint, and a home that truly suits your needs.

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If you live in South Australia, email me your block plan(s) for a free consultation
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Where is my home's energy going?

1/7/2024

 
Before you can improve your home’s comfort or reduce energy costs you need to know where the energy is going.

The problem is that every home is different, and energy flows depend on location, house design and other factors. So, if you live in South Australia, say on the Adelaide plains, then the answer is different from if you live in Melbourne or Sydney. It will even be different if you live in in the Adelaide Hills.
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This is why it is important to think critically about where the advice you are looking at is coming from.

Poor Sources of Advice

One of the worst sources of advice is from home improvement and reality TV shows. They can be fun to watch, but take everything with a grain of salt. Often the products spoken about are from sponsors and might claim product ‘A’ can save you up to say 76% of energy loss, without saying what location, what type of house and what type of heating and cooling they are using.
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Also be aware of YouTube videos, it can be difficult to find the source of the video and often the information is wrong for your location (particularly if from overseas). This particularly applies to advice on how to keep cool from the colder parts of America or Europe. What works if the maximum temperature is 26 degrees is not going to work if the temperature is 40 degrees or hotter.

Where is my house losing heat?

If you are trying to improve comfort, the chart below shows the minimum, average and maximum percentages that the different cause of heat loss can have for a range of existing homes in and around Adelaide.
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Note that these figures differ from the Your Home data as they are for the Adelaide area, and not for Australia as a whole.
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This shows for example that if your windows are only 15% of heat losses but your floor is 30% of heat losses, you should concentrate on the floor first, although for most people the windows are a better place to start.

What is costing me money for energy?

Similarly, if your goal is to reduce energy costs, then the following chart shows the range of energy use cost estimates from recent Residential Energy Audits before improvements (again in the Adelaide area).
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This shows that in most homes heating and cooling dominate. Heating energy cost is usually more than cooling energy cost. However, hot water can be expensive, depending on your usage and type of water heater.

Lighting is usually minimal unless you have lots of halogen down lights.

I have ignored pools and spas to avoid distorting the results, but if you have one it could easily be 35% of your energy costs.
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Note that Scorecard ignores cooking and other appliances, because in general their energy use is low. Newer appliances tend to have much lower energy consumption than old appliances, due to minimum performance ratings and/or star ratings helping you choose efficient appliances. An admittedly extreme example is when our 20-year-old TV died, the same size replacement TV only uses 10% of the electricity that the old one did.

Recommendations

Even though this data is from one location, there is still a huge variability. If you intend investing a significant amount of time or money over the next few years, you want the best bang for the buck, so you don’t waste money and time on something with no noticeable effect. To do this:
​
  • Check that your sources of information are relevant.
    • ​Use information from your region.
    • Check that the information is relevant for your house type.
    • Beware of sponsored content.
    • Consider getting a home energy efficiency assessment. It will save you much more than the cost, and ensure you achieve your goals quicker.
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