The influence of builders on seismic strengthening of housing

Abstract

Trust in information sources is essential for bridging the gap between intentions to seek seismic preparedness advice and the adoption of protective measures, such as retrofitting homes. Builders are one of the most frequently consulted sources when homeowners seek to strengthen or repair their homes for earthquake resistance. While research has focused on homeowners, engineers, and the seismic risk of tall buildings, the crucial role of builders at the residential housing level has been largely overlooked. Builders are typically the ones responsible for carrying out work in residential settings, such as renovations or maintenance. However, opportunities to promote and encourage seismic retrofitting during these works are generally missed. Using semi-structured interviews with builders and engineers, this study explores current industry trends, builders' needs and priorities, their perceptions of seismic strengthening, and their views on existing educational pathways. Findings suggest that although builders hold an influential position in the communication and implementation of seismic resilience measures, they are often excluded from discussions about preparedness and from the design of their own training opportunities. Homeowners' resistance and perceived liability risks discourage them from initiating conversations about seismic upgrades. Among other findings, this study highlights that meaningful engagement with builders is essential for improving the seismic resilience of Aotearoa New Zealand's residential housing stock.