NCC Version:
NCC 2019 Volume One – Building Code of Australia
Area of NCC Requirements:
Section D – Access and Egress (Clauses D3.1, D3.2, D3.3)
Section F – Health and Amenity (Clause F2.4)
AS1428.1:2009 – Design for access and mobility
Problem:
The proposed commercial development includes three key compliance departures from the Deemed-to-Satisfy (DTS) provisions of the NCC. These include insufficient latch-side clearances for two doors, grabrail encroachment into the circulation space of an accessible toilet, and a ramp landing that is undersized at a 90-degree turn. These non-compliances challenge the building's ability to meet required accessibility and safety standards, potentially impacting users with mobility limitations and risking non-approval unless adequately justified through performance-based compliance methods.
Solution:
To address these issues, performance solutions were developed using expert judgment, comparisons with DTS provisions, and anthropometric research. Door clearance concerns were mitigated through analysis of user reach ranges and suggestions for future automation. The grabrail encroachment was deemed functionally equivalent to allowable washbasin intrusions, as it maintained required knee and toe clearance. For the reduced ramp landing size, data from contemporary studies demonstrated that a smaller space still accommodated the majority of wheelchair users effectively. These solutions demonstrated that the design meets the intent of the NCC’s performance requirements, ensuring safe, functional, and dignified access.
Finalised Report:
The report confirms compliance with the relevant NCC performance requirements using acceptable assessment methods, including expert judgment and comparison to DTS. It recommends preparatory measures such as provisions for future door automation and adherence to compliant construction practices. The proposed design is considered to provide equivalent access and usability outcomes, supporting approval through a performance-based pathway.