Breaking it down simply
There are three nominated time periods
Building elements should last at least 5, 15, and 50 years
- Things easy to see failing and replace = 5 years (think light switches)
- Things easy to see failing but moderately hard to replace = 15 years (think roof)
- And the rest are at least 50 years (think foundations)
These timeframes kick in when the code compliance certificate is issued at the end of a consent. Not when the building is practically complete
- Owners forget to get this certificate
- They think their builders got it fir them
- Legally the house is not signed off
- And the durability clock never starts.
Owners may be able to obtain a B2 modification (a process I will explain in another blog) but the longer they wait the more unlikely it gets.
Download B2 durability document here