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Home » Products » Property certificates » Sydney Water » BOS BAS letter

Sydney Water BOS/BAS letter

BOS/BAS Letters

A Sydney Water building over sewer (BOS), also known as a building over adjacent to asset advice (BAS) letter tells you if Sydney Water approved a building close to, or over, Sydney Water pipes. 

Selling agents and conveyancers use the letter to determine if a building on a property has been built with Sydney Water approval.

Sydney Water must approve all buildings and structures that need approval from council or a private certifier. 

If your building is close to, or over, Sydney Water pipes, you need to understand Sydney Water’s requirements. They ensure:

  • Damage is not caused to pipes and structures.
  • Sydney Water have ongoing access to maintain pipes and structure.

BOS/BAS Letter features and benefits:

  • InfoTrack’s system automatically picks up the council locality of the property and alerts you to which certificates are relevant for that property.
  • Ability to chase waiting certificates and view updates through the iSupport System.

Sydney Water Quick Links

Section 66 Certificate >
Service Location Print >
Sewer Service Diagram >
Section 88G Certificate
Statement of Available Pressure and Flow >
BOS BAS Letter >
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