Leanhaus are the pioneering architects and innovators for Passivhaus in Western Australia

After years of practise and research, we found that only Passivhaus provides a proven scientific method for achieving healthy and comfortable homes for the WA climate. 

Previously only available to knowledgable clients with large budgets, we have developed the ideal construction methods for WA's warm temperate climate, and partnered with our Passivhaus qualified builders to deliver this efficiently.

Fast, robust, cost effective and materially efficient, our homes are designed to perform to a higher comfort standard and reduce energy consumption for heating and cooling by up to 90%.

  • average air temperature of 21 degrees, and over 25 degrees for no more than 10% of the time

  • surface temperatures should be higher than 17 degrees

  • air leakage less than 0.6 air changes per hour when measured at 50 pascals (no draughts)

  • fresh, filtered air all the time

  • no draughts and no cold spots

Thermal comfort is the ultimate aim of Passive House. Internal temperatures are stabilised and a fresh air is supplied continuously for the well being of the occupants. 



Up to 92% carbon reduction against benchmarks.

 Passivhaus Design Optimisation

  • Passivhaus design optimised in house (Design PH and PHPP)

  • Highly efficient building envelope to minimise unwanted heat gains and losses.

  • Solar Passive Design and Passive Cooling design strategies to maximise comfort.

  • Airtight and thermal bridge free construction.

Limit upfront embodied carbon

  • We greatly reduce or eliminate the requirement for carbon intensive structural concrete and steel

  • Low carbon timber and renewable materials preferred.

  • Materials sourced locally where possible

  • Design to reduce waste through careful selection of products for module size optimisation

Consider whole of life carbon

  • Cradle to grave philosophy considers impacts at each stage of a product's life-cycle.

  • Preference for timeless style and quality materials to ensure long life that will not require premature disposal and renewal.

  • Preference for materials that require minimal on-going maintenance. We avoid applied external finishes that require constant renewal.

  • We prefer composite structures can be readily dismantled and re-used at end of life.

  • Our homes have been certified to show up to 92% carbon reduction against benchmarks.

Reduced Operational Energy Demand and Consumption

  • Highly efficient building envelope requires less energy to maintain a comfortable internal environment.

  • Highly energy efficient services and appliances such as Heat Pump Hot Water and Induction Cooking.

Eliminate Fossil Fuels

  • Electric only services provision.

  • No need for natural gas connections to the home.

Provide on site renewables and storage

  • Solar Power with provision for future household battery storage.

  • Provision for Electric Vehicle charging.

  • On site rainwater storage available

Certify and Disclose against reputable standards

  • Option to certify Lifecycle Carbon costs.

  • Option for Passive House Certification.