PHPP Modelling Explained:
A Smart Way to Save on Energy Bills
PHPP modelling, or Passive House Planning Package modelling, is a design tool used to accurately calculate the energy performance of a house, particularly for low-energy and Passive House standards. It functions by assessing factors such as insulation, airtightness, solar gains, ventilation, and thermal bridging to determine a building’s heating and cooling demands. During the design process, PHPP helps architects and engineers optimise building components to achieve exceptional energy efficiency, occupant comfort, and compliance with Passive House certification requirements.
PHPP modelling can save the homeowner money by guiding the design of a house that uses significantly less energy for heating, cooling, and ventilation. By optimising insulation, airtightness, and passive solar gains, the model ensures that the building requires minimal energy to maintain comfortable indoor temperatures. This translates into lower utility bills over the life of the building. Additionally, because PHPP identifies inefficiencies early in the design phase, it helps avoid costly design errors or retrofits later, leading to long-term savings on both energy and maintenance costs.
PHPP modelling provides confidence to the homeowner by offering a clear, science-based prediction of how the home will perform in terms of energy use, comfort, and indoor air quality. Because it relies on proven building physics and detailed inputs specific to the house's design and location, homeowners can trust that the results are accurate and realistic. This transparency allows them to make informed decisions about materials, insulation, and systems before construction begins. Knowing their home will meet strict energy efficiency standards and deliver consistent comfort throughout the year gives homeowners peace of mind and assurance that their investment is both sustainable and cost-effective.
North South Homes engages a certified PHPP consultant for every project they build to ensure precision, performance, and compliance with international Passivhaus standards (if required). From the early design phase, the consultant collaborates closely with the design and construction teams to model the home’s thermal performance, assess energy demands, and fine-tune building specifications. This rigorous process ensures that every element—from insulation levels to window placement—is optimised for maximum efficiency and comfort. By integrating PHPP modelling from the outset, North South Homes guarantees that each project they deliver not only meets certification criteria (for Passivhaus) but also provides long-term energy savings and year-round comfort for homeowners.