![Figure 1: Hospitalisation rates in HNZC applicants and tenants according to household crowding level. These are average annual rates for the February 2003 to June 2005 period found in the Housing, Crowding and Health Cohort Study.](/assets/Uploads/Pg36-Graph1__ClownCarImageQualityWzc1XQ_FillWzExMywxMTNd.jpg)
![preventing disease](/assets/Uploads/preventing-disease__ClownCarImageQualityWzc1XQ.jpg)
![This Issue](/_resources/themes/branzbuild/resources/img/badge-feature-section-121x121.png)
Feature section: Preventing disease
Buildings should be safe havens but under some conditions they actually make people sick. From reactions to dust-mites or stachybotrys, to contaminated drinking water, or infectious diseases in overcrowded homes.
![complex buildings](/assets/Uploads/complex-buildings__ClownCarImageQualityWzc1XQ.jpg)
![This Issue](/_resources/themes/branzbuild/resources/img/badge-feature-section-121x121.png)
Feature section: Complex buildings
Complex buildings, such as those in categories 2 and 3 of the proposed building practitioner licensing, make up a significant proportion of the industry's construction work, and present many challenges for everyone involved.