Demonstrating "substantial" progress on design documentation before the latest NCC takes effect can be complex and subjective. Ensuring the Relevant Building Surveyor (RBS) accepts this can make all the difference in securing a building permit under a superseded NCC.

When measuring distance between alternative exits, you have to consider where the point-of-choice is? The NCC Guide to Clause D2D20 states the where calculation of distance between alternative exits must pass through the point from which travel in different directions is available.

What test report do you need for a wall-lining? A data sheet downloaded from the supplier's website may not be enough. Relevant Building Surveyor requires a test report from an accredited lab detailing the material type, test standard, and group number.