Project Information

• Passivhaus Classic
• RESIDENTIAL 16 semidetached houses and 1 block of 12 flats
• Airtightness (@50 Pa) 0.48 ach
• Form Factor 1.7
• Space heating demand 14.4 kWh/m2/yr

Our Focus

As the Passivhaus consultant WARM worked closely with the Architect during the design and construction stages, to optimise building form fabric performance within design constraints and manage overheating risk. During the construction phase we liaised closely with the contractor to troubleshoot any issues which arose with regard to airtightness, thermal bridging and MVHR installation.

We undertook a detailed post-occupancy evaluation of the energy use of this development using 3 dwellings, where we monitored equipment (measuring hot water, heating, gas, power, temp, humidity, CO2, water) and a further basic consumption for the remaining 25 (gas, power, water). The results of the monitoring were outstanding, demonstrating that the design has drastically reduced energy bills for the tenants and provided comfortable high-quality accommodation with high satisfaction from the
residents. The combined average daily gas and electricity running costs for Cameron Close in both years of monitoring were 50% lower than for the average of UK households in 2015. The bulk of the savings are in the reduction of heating energy. Doing the monitoring picked up a few issues which were resolved in year 1. This strengthens the case for Post Occupancy Evaluation. Items picked up were

• The need to change filters on the MVHR
• MVHR condensate leaks
• Some residents did not understand the controls