Passive House Perth

Kellett Design Group (KDG) is a design-focused practice with an established reputation in Australia and Ireland. Over the last few years, we have been recognised as specialists in Passive House design.

Get a quote today!

Please upload any relevant photos, images, plans or docs.

The Passive House standard is globally recognized as the most rigorous, science-based energy efficiency standard. Building to this standard requires going beyond the usual code requirements, and that’s where we at Kellett Design Group excel. We offer Passive House Consultancy services in compliance with this stringent international standard.

Our experience spans over 30 projects in Ireland and Perth, and we’re endorsed by the Passivhaus Institut in Germany to certify Passive House buildings worldwide. At Kellett Design Group, we design and build high-performance homes to the most stringent energy efficiency standards.

Book A Free Call With Our Passive House Specialist Whether you are aiming for Passive House Certification or merely desire to create a healthier, more comfortable home, we can help you realize your goals.

What is a Passive House?

The most common type of Passive House is known as Passivhaus, a standard developed by Dr. Wolfgang Feistel. This standard sets rigorous guidelines for insulation installation in new residential constructions and promotes the concept of sustainable architecture. A Passive House is an energy-efficient building that consumes less than 20% of the energy used by conventional structures. It can be built in any climate zone.

The main components of a Passive House are:

  • High-performance windows with low emissivity glass
  • Thermal mass on all surfaces
  • Tight construction for maximum insulation efficiency
  • Airtightness to reduce infiltration losses
  • Extensive use of earth-sheltered design

Passive House Explained

The fundamental principle of Passive Housing is to slow down heat transfer through your home, eliminating the need for extensive cooling and, consequently, reducing energy bills. Passive Houses rely on natural convection currents within the envelope itself to regulate the internal temperature.

Passive Housing is based on three principles:

1. Insulation

Passive Houses are insulated sufficiently to maintain comfortable temperatures throughout the year without relying on furnaces or air conditioning.

2. Ventilation

Airflow is crucial in designing a Passive House. Natural convection currents help move hot air out and replace it with fresh air.

3. Construction

Tightly sealed structures limit heat transfer between the indoors and outdoors.

Our passion is to provide Passive House Consultancy services to this stringent international standard. Book a Free 30 Minute Consultation Today


BDAWA Design Awards Design Matters National Certified Passive House Design


  • star BDAWA ‘Best Sustainable Design’
    2020 WINNER
  • star Certified Passive House
  • star Design Matters National Member


  • BSc. Architectural Design
  • MSc. CAD & Construction
  • BSc. Applied Science (Architectural)
  • BSc Environmental design
  • BSc. Architecture
  • MSc Architecture

Frequently Asked Questions About Passive Housing

Green buildings focus more on environmental sustainability than just energy efficiency. They often include features like low VOC paints, recycled content products, and sustainable landscaping practices. However, these types of projects usually come at a premium price tag.

Passive houses typically have higher initial costs because they require extra materials such as concrete walls, special foundation designs, heating systems, ventilation systems, waterproofing membranes, geothermal heat pumps, etc. but those added expenses pay off very quickly! A new passive house could save $100 month over 30 years.

Exterior wall cladding allows solar gain while reducing U value. It helps keep the interior cool during the summer months and warm during the winter months. Double glazing reduces the transmittance of both visible light and infrared radiation from entering the space. This makes rooms feel more relaxed in summer and warmer in winter. Roof shingle system provides excellent long term maintenance free protection against water penetration and wear due to snow loads and wind uplift forces rain screen membrane protects the structure below from moisture damage caused by precipitation accumulation above the membrane.

The most common type of roofing system used in passive houses is called TPO. The advantage of this material over other types of roofs such as asphalt shingles is its ability to withstand extreme weather conditions like heavy winds and hail storms without leaking. In addition, there is no need for painting which saves money and time.

The window frame must have at least two layers of glass separated by one layer of polyethylene sheeting. There should not be more than 1/8" gap between each pane of glass. If you live in a cold area where temperatures drop well below freezing, consider adding additional layers of polyethylene film around your windows.

Doors, skylights, ventilation, heating & cooling, lighting, appliances, plumbing, electrical, floor coverings.

The best way to achieve good indoor air quality is through proper ventilation. Passive houses have very little fresh air exchange because they rely heavily on natural convection currents. Therefore, when designing a passive house, you must consider how much fresh air needs to enter your home each day. You should aim to have about 10 times more fresh air per person inside the house than what would typically be found outside.

A passive house heating system uses electricity only to run pumps that circulate heated water throughout the house. The circulation process creates a continuous cycle of transferring heat from one area to another. There are two types of systems used in passive homes; hydronic and radiant. Hydronic systems have been around since the early 1900s. Still, they were not widely adopted until recently because they required expensive plumbing fixtures and piping.

To achieve high levels of comfort in a building, it's necessary to ensure good airflow across all surfaces. Achieving this requires careful planning at every stage of construction. One way to do this is to use what is known as 'heat recovery ventilation. HRVs work by drawing warm outdoor air into the building via vents located near the top of each window frame. As the air passes over cold glass panes, some of its warmth is lost.

This simulation tool allows users to create detailed 3D models of buildings and their components such as HVAC equipment, lighting, appliances, furniture, etc., and simulate performance under different conditions. It provides information about the total annual consumption of electrical power, fuel oil, gas, steam, chilled water, space heating, and cooling.