The OneRoof–Kantar Housing Survey 2021 was taken between Wednesday, October 20, and Wednesday, October 27, using the ConsumerLink Flybuys panel in New Zealand, which has more than 100,000 active members. Sampling was nationally representative, and then was post-weighted by age, gender and region to ensure it matched the underlying population as published by Statistics New Zealand. Only those aged 18-plus were included. The sample size was n=1,001 and the maximum margin of error for total sample (at 95% confidence level) was plus or minus 3.1%.