First, they are temporary houses, so they can be moved.
The Canadian Red Cross committed to build 30,000, but they have not built 30,000 yet. They've built 1,400 to date.
On March 21st, 2011. See this statement in context.
Director General, International Humanitarian Assistance Directorate, Multilateral and Global Programs Branch, Canadian International Development Agency
First, they are temporary houses, so they can be moved.
The Canadian Red Cross committed to build 30,000, but they have not built 30,000 yet. They've built 1,400 to date.
See context to find out what was said next.