Some architects and homeowners want a succession of different design options to be modelled using PHPP, the Passivhaus Planning Package.

We offer additional, iterative PHPP analysis, working closely with the homeowner or architect, to further refine the whole house plan analysis from the previous step.

For each step in your retrofit journey, we can report for example:

• Heating demand
• Total household energy usage
• Overheating days per year (%)
• CO2 emissions

This allows you to select your improvement options carefully, adjust their sequencing to get the most benefits first; or work out the energy saving impact of an extension to an older building.

A building that has well designed shading and insulation, for example, can avoid overheating in a heat wave and stay cooler in summer and warmer in winter – getting the best of both worlds!

Cost: £50 inc. VAT per hour