100 new injury claims are lodged by tradies each day
Ongoing delays for a wide range of products are stretching the build time for an average house from five months to 12.
Only the four most critical products can be manufactured: plasterboard, gypsum plaster, coated roofing steel and insulation.
The industry has called crisis meetings with ministers and a leaked report shows more than 3000 workers are needed.
In Auckland alone, construction and demolition produce nearly 570,000 tonnes of waste a year.
A wait for supplies which used to take two weeks can now take two months.
Much of the annual economic growth was driven by the construction sector.
The family says the building site is threatening their safety.