Building over or adjacent sewers
While Unitywater aims to minimise constraint on property owners wanting to undertake works on their properties, we must also ensure any proposed works do not impede our current and future ability to provide water supply and sewerage services. This includes avoiding unnecessary expense or risk of damage to our infrastructure.
Property owners will therefore need approval to build or carry out work near Unitywater’s infrastructure. This approval is additional to any other approval needed to carry out the works you propose.
Instances where you will need to seek approval include (but are not limited to):
- Where driven piles or piers are located within 10 metres of Unitywater infrastructure;
- Where any building or structure is deemed to be within the “zone of influence*” of Unitywater infrastructure;
- Where earthworks are directly over or will affect the structural integrity of Unitywater infrastructure;
- Where bored excavations for piers or footings are located within the “zone of influence*” of Unitywater infrastructure;
- Where the width of the access path from the front boundary to any access hole or sewer property connection located on the property is less than 3 metres;
- Where the vertical height to finished surface over Unitywater infrastructure will be reduced to less than 2.0 metres;
- Where the clearance from Unitywater infrastructure to a fence, building or other structure will be reduced to less than 1.5 metres.
A Registered Professional Engineer of Queensland (RPEQ) may be required to design and/or approve the proposed building or structure. The RPEQ may be required to prepare “as-constructed” drawings.
Works to reline any Unitywater infrastructure must be performed by Unitywater or by a Unitywater approved contractor.
Works to relocate any Unitywater water infrastructure may require separate approval under the South East Queensland (Distribution and retail Restructuring) Act 2009.
Assessment of building over and adjacent to a Unitywater asset
Any proposal to build over and adjacent to a Unitywater asset must, in the first instance, be assessed under the Queensland Development Code (QDC) 1.4 – Building over or near relevant asset. This is applicable to all class 1 and 10 building/structures and is a mandatory requirement of the Queensland Development Code. The Queensland Development Code (QDC) 1.4 – Building over or near relevant asset can be found at hpw.qld.gov.au. Please contact a Private Building Certifier or Registered Professional Engineer of Queensland (RPEQ) if an assessment is required under QDC – 1.4.
If the assessment cannot be undertaken in accordance with Queensland Development Code (QDC) 1.4 – Building over or near relevant asset, an application must be made to Unitywater as the service provider and owner of the asset for assessment and approval.
How do I submit my application?
Applications and fees may be lodged by:
* Zone of influence – The zone of influence is that area of strata likely to be affected by superimposed loads. The boundary of the zone of influence is nominally defined as a line projected at a 45o angle from the invert of the sewer to the natural surface. The actual boundary of the zone of influence may be affected by factors including groundwater and soil type and must be determined by an RPEQ.
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