A meta-analysis of the schematic design process of deep retrofit projects

• Meta-analysis performed on the deep retrofit proposals for six social housing MURBs. • A convergence of design solutions for deep retrofits of low-rise MURBs. • Deep retrofits of MURBs in British Columbia can reduce GHG emissions by 80% • Proposed deep retrofits reduce TEUI by 45–81%, TEDI by 57–81% • Market transformation is key to improving the financial viability of deep retrofits. Deep retrofits of the existing building stock will be necessary to meet global emissions reductions targets. One building archetype, low-rise MURBs have been neglected in terms of research and funding for deep retrofits. A meta -analysis was conducted that compares and contrasts the schematic design approach taken for six such buildings in British Columbia which are scheduled to undergo deep retrofits with the goal of reducing GHG emissions by 80%. The analysis showed that design teams had converged toward common solutions for each building while achieving the GHG reduction target. The recommended measures include electrification of space and domestic hot water heating, adding insulation through overcladding, air sealing, ventilators for each unit, and double pane windows. A life cycle cost analysis showed that the economic viability of deep retrofits were dependent on energy price forecasts, capital cost reductions through market forces and transformation, or incentives cover the non-monetizable co-benefits of deep retrofits such as improved resiliency to climate-change or reducing overheating and air quality risks. The meta -analysis can help to streamline the early-stage and schematic design process for such buildings, which is critical to increasing the retrofit rate. This process could be replicated for other building types and construction archetypes.