Passivhaus Award

Edward Pearce LLP  were appointed as MEP consultants by Grosvenor for their Project at 11 and 19 Passmore Street in 2013.

Developed by Grosvenor Britain & Ireland, they were identified as ‘pilot’ projects, as part of the company’s commitment to reduce their carbon emissions by 50% across their directly managed property portfolio by 2024.

These properties are now the first privately rented buildings to achieve EnerPHit standards in London.

I felt refreshed and full of energy in the mornings because of the filtered fresh air!

Mr Dylan Pritchard

11-19 Passmore Street. Passivhaus Trust Awards 2015.

Project Overview

  • Name: Passmore Street
  • Location: Belgravia, London
  • Building Type: Mid-terraced house, historic 1860s
  • Construction Type: Solid masonry + timber extension
  • Completed: January 2015
  • Occupancy Status: Occupied since February 2015
  • Construction Cost: Confidential

Sustainability Features

  • Primary Energy Demand: 127 kWh/m2a
  • Space Heating Demand: 23.5kWh/m2a
  • Heating & Cooling Load: 11W/m2
  • Ventilation strategy: MVHR (Paul Focus 200)
  • Heating strategy: Gas boiler (Vaillant Ecotec Plus 824)
  • Shading strategy: Internal curtains, external blind - rooflight
  • U values (W/m2.K): Interior insulated walls 0.16, Exterior insulated wall 0.11, Roof 0.10, Floor 0.16, Windows 0.68/1.18, Doors 0.68

Measured Performance

  • No. 11 & 19 EnerPHits are performing 77/83% better than a neighbouring property that received double glazing, roof & wall insulation.
  • Analysis of actual energy use: 3 months data (Feb-Apr’15): Gas heating - 14.9/11.8 kWh/m2 (higher than anticipated due to property being privately rented, tenants received no training, keeping thermostat high).
  • Total Primary Energy - 27.3/ 23.5 kWh/m2 - incl. PV generation & using PHPP conversion factors (good performance).



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