Building Better: Understanding High Performance Homes
There is the minimum standard required to build a house, and then there is everything possible above it. Building codes provide an important baseline for safety, health and energy efficiency, but they are still only the starting point.
Building a high performance home means looking beyond minimum compliance and aiming for the gold standard. It means creating a home that is carefully designed, detailed and constructed to hold a comfortable temperature, provide filtered indoor air and manage moisture before it becomes a problem.
The result should be a home that feels comfortable, supports your family’s health, uses less energy and stands the test of time. It should not perform well for only a few decades before major work is needed. The goal is to create a home that remains comfortable, healthy and structurally sound for 100 or even 200 years.
What is a high performance home?
The term “high performance” can mean different things to different builders. From the Two Hammers perspective, it means designing and building using proven Passivhaus principles to create a home that is comfortable, healthy, energy efficient and built to last.
A high performance home works as one complete system. This includes creating a well insulated and carefully sealed outer shell, positioning the home thoughtfully and preventing heat and cold from passing through weak points in the structure.
Controlled ventilation provides a steady supply of fresh, filtered air while removing stale air and excess humidity. This helps maintain a comfortable indoor temperature while reducing the conditions that can lead to condensation and mould.
Simply adding more insulation or installing double glazing does not make a home high performance. The design, materials and construction details must work together, and the quality of the work on site matters just as much as the plans.
High performance home vs certified Passivhaus
A high performance home can be designed and built using Passivhaus principles and performance targets without pursuing formal certification. This allows you to benefit from the same considered approach to comfort, energy efficiency, air quality and durability.
However, a home can only be officially recognised and promoted as a Passivhaus after it has successfully completed the required certification process. Certification involves detailed modelling and documentation, independent assessment and performance testing to verify that the completed home meets the required standard.
The difference is not simply about adding more features. Certification provides independent verification that the home has been designed and constructed to achieve the required Passivhaus performance targets. If you decide to sell in the future, this documented performance may also strengthen buyer confidence, help your home stand apart and potentially support its resale value.
Predicting How Your Home Will Perform
One of the main tools used in Passivhaus design and Two Hammers’ high performance home builds is the Passive House Planning Package, known as PHPP.
PHPP uses information about the local climate, orientation, insulation, windows, shading, airtightness, ventilation and building services to model the expected performance of a home. It allows different design decisions to be considered before they become costly changes during construction.
Instead of relying on a general claim that a house should be energy efficient, PHPP provides measurable information about its predicted heating, cooling and overall energy demands. The Australian Government’s Your Home resource explains that PHPP can be used to compare different design options and closely predict how a building will perform in real life.
Using Passivhaus principles and PHPP modelling provides a clear framework for better decision making. It replaces assumptions with evidence, testing and accountability.
Your home’s protective layer
A large part of how well your home performs comes down to how effectively it is protected from the conditions outside. This protection is created by the building envelope, which includes the roof, walls, floors, windows and doors.
It must also manage water vapour safely so it does not become trapped inside the structure. Small gaps, poorly detailed junctions and incorrectly installed windows can affect the performance of the entire house.
This is particularly important across South West WA, where homes in areas such as Prevelly, Gnarabup, Yallingup and Eagle Bay are often exposed to salt, strong winds and horizontal rain. Wind driven rain can find its way beneath roof cladding or through poorly sealed gaps around windows and doors. Once water enters these small spaces, capillary action can draw it further into the walls or roof cavity, creating hidden moisture problems.
Winter humidity is another major consideration. When warm, moisture filled air meets a cold surface, condensation can form inside walls, roofs and around windows. Without the right membranes, drainage and ventilation, that moisture can become trapped and create the conditions mould needs to grow.
These construction details are what help keep your home dry and protected for decades. Mould is not only difficult to clean and remove. It can also affect indoor air quality and contribute to poor health outcomes for the people living and breathing inside the home.
Airtight does not mean stuffy
A common misconception about high performance homes is that an airtight house cannot breathe.
In a conventional home, air enters through uncontrolled gaps around windows, doors, floors, walls and roof junctions. You have little control over where that air comes from, how much enters or what it carries with it.
A high performance home takes a more considered approach. The building is carefully sealed, while a mechanical ventilation system supplies fresh, filtered air and removes stale, humid air from bathrooms, kitchens and other internal spaces.
This controlled ventilation can reduce the amount of pollen, outdoor allergens, smoke and airborne particles entering the home. It also helps remove excess humidity, cooking odours and chemicals released from new cabinetry, flooring, furniture and finishes.
The result is not a home sealed like a plastic container. It is a home where fresh air is managed properly. You can still open your windows whenever you choose, but your home does not depend on accidental gaps and draughts for ventilation.
A healthier and more comfortable home
A stable indoor temperature is one of the most noticeable benefits of a high performance home. There are fewer draughts, fewer cold surfaces and less need to constantly run heating or cooling to remain comfortable.
Effective moisture management also reduces the conditions that allow condensation and mould to develop. This helps protect the building itself, but it may be even more valuable for families affected by asthma, allergies or chemical sensitivities.
A home that requires less heating and cooling can also use considerably less energy throughout its life. The exact savings will depend on the design, energy prices and how the household uses the home. However, the value is not limited to the next electricity bill. Comfort, health, lower energy demand, reduced maintenance and long term durability all contribute to the return on your investment.
A home built for generations
True sustainability involves more than solar panels or products carrying an environmental label. If a house performs poorly, develops moisture problems or requires major remedial work after a few decades, it has not genuinely been built for the future.
A forever home should be designed to last. That means understanding how air, heat and moisture will move through the building. It means selecting materials and construction details suited to the location. It also means investing in the parts of the home that will be difficult or expensive to change later.
Two Hammers Construction builds high performance and Passivhaus informed homes across Margaret River and the South West. If you are planning a home in Augusta, Prevelly, Margaret River, Cowaramup, Yallingup, Eagle Bay or the surrounding region, start a conversation with Two Hammers about creating a healthier, more comfortable home that is ready to serve your family for generations.
Frequently asked questions
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A high performance home is designed so its insulation, airtightness, windows, ventilation and moisture protection work together as one system. This helps the home maintain a comfortable temperature, use less energy and provide healthier indoor air.
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Yes. High performance homes can be designed around the specific conditions of their location. Across South West WA, this may include protection from coastal winds, salt, horizontal rain, winter humidity and changing seasonal temperatures. The design and construction details should respond to the specific site location.
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Yes. You can open the windows whenever you choose. The difference is that the home does not rely on open windows or uncontrolled gaps for fresh air. A mechanical ventilation system provides a steady supply of filtered air while removing stale air and excess humidity.
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A high performance design can significantly reduce the conditions that allow condensation and mould to develop. Airtight construction, effective ventilation, suitable membranes and carefully detailed windows help control moisture and prevent it from becoming trapped inside the home.
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A high performance home can require a greater investment upfront because of the additional planning, modelling, materials and construction detail involved. Over time, lower energy use, improved durability, reduced maintenance and greater comfort can provide considerable long term value.
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A high performance home is designed to provide greater comfort, energy efficiency, healthier indoor air and long term durability. It may use Passivhaus principles and performance targets however a home can only be officially recognised as a Passivhaus after completing the required independent assessment, documentation and performance testing.