Guidance on barrier design for Building Code clause B1

All content related to B1 Structure

About this document

  • Published on 1 March 2012
  • Of interest to Manufacturers, Builders, Designers,
  • ISBN: 978-0-478-38116-0 (Online)
  • 3rd edition


This document brings together relevant information and recommendations for the design and construction of permanent barriers required in and around buildings. Find out about barriers to:

  • decks, stairs and landings
  • walls, glazing (including screens and full-height glazing), fences and other elements of buildings where these elements prevent a fall of one metre or more.

It does not cover swimming pool fences, which have additional requirements under the Fencing of Swimming Pool Act.

It looks at design criteria, loadings, different materials, and the supporting structure. It references all relevant Building Code clauses for barriers:

  • B1 Structure
  • B2 Durability
  • D1 Access routes
  • E2 External moisture
  • F2 Hazardous building materials
  • F4 Safety from falling

This was developed to replace the Acceptable Solution for timber barriers with design information to cover the range of barrier materials (including timber) currently used in the industry. B1/AS2 (Timber Barriers) was removed because timber properties and barrier loadings changed and made it obsolete.


  1. Scope and Definitions
  2. Guidance and the Building Code
  3. Design Criteria
  4. Materials
  5. Checklist
  6. References
  7. Index of Diagrams
  8. Index of Tables

All guidance documents related to B1 Structure

This information is published by the Ministry of Business, Innovation and Employment’s Chief Executive. It is a general guide only and, if used, does not relieve any person of the obligation to consider any matter to which the information relates according to the circumstances of the particular case. Expert advice may be required in specific circumstances. Where this information relates to assisting people: