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Bristol City Council

… and ventilation is achieved mechanically without heat recovery. Part L 2025 This scenario is also based on an additional notional building specification provided by the government in their response to the Future Homes Standard Consultation. Insulation levels and glazing performance are increased close to that required for Passivhaus, however airtightness remains poor at 5m3/m2hr and no heat recovery…

… 2021 Compliance Part L 2025 (Future Home Standard) Part L 2025 (Future Home Standard) + PV UKGBC 2025 Policy Option A - Current Policy Option B - Future (Passivhaus & PVs) Total build costs for the high rise modelled block based on analysis by Currie and Brown (incl. assumption of wall mounted PVs on a brick façade). Percentage cost uplift relative to a Part L 2021 compliant…

… A - Current Policy Option B - Future Home Standard) Home Standard) + PV (Passivhaus & PVs) Total build costs for the high rise modelled block based on analysis by Currie and Brown (incl. assumption of façade mounted PVs on a rainscreen cladding system). Percentage cost uplift relative to a Part L 2021 compliant building is also shown. 2021440| Bristol High rise energy modelling | Jan 23 | Rev D…

… in their recent response to the Future Homes Consultation. Changes include modest improvements to insulation, shower drain wastewater heat recovery and roof mounted solar PV. While heating is still based on a gas boiler, it is possible that developers could use heat pumps instead of wastewater heat recovery and solar PV to achieve the required performance. Airtightness is relatively poor at 5m3/m2hr…

… - Home Standard) Home Standard) + PV Current Future (Passivhaus + PVs) Gas Price (p/kWh) 7.2 7.2 - - - - - Average Electricity Price 28.0 28.0 22.5 22.5 18.0 18.0 18.0 (p/kWh) Solar Consumption - 20% - 40% 30% 50% 50% Annual energy costs including standing charges, based on PHPP predicted energy use. Solar PV savings from avoided grid import, and value of exported solar energy also shown…