Surface Development Guideline 6
This page explains the requirements for constructing a complying development on a property in a Mine Subsidence District that has been assigned Guideline 6.
Guideline 6 applies to properties likely to be undermined in the future with subsidence-induced ground movements.
Development that complies with this Guideline will generally accommodate the following subsidence-induced ground movements:
| Maximum Horizontal Ground Strain: | 2mm/m tensile or compressive. |
| Maximum Tilt: | 4mm/m. |
| Minimum Radius of Curvature: | 10km (hogging and sagging). |
Allowable residential construction
Guideline 6 allows for up to two residential buildings that conform with the following description:
Single storey or two storey, clad frame or masonry veneer residential buildings, erected on reinforced concrete footings and slabs, designed and constructed to comply with AS 2870-2011 for the relevant site classification. Site classification “P” for Mine Subsidence is to be ignored for these structures.
- Masonry is to be articulated, in accordance with the current editions of Australian Standards AS3700 and AS4773.
- These improvements are limited to a maximum length of 30 metres and a maximum footprint area of 500m2.
Prohibited works
The following works are not permitted under this Guideline:
- Integral retaining walls
- Basements (including partial basements where one or more walls acts as a retaining wall)
- Suspended, drop edge or stepped slabs
- Masonry internal walls
Commercial buildings or applications for more than two separate residential buildings require assessment by Subsidence Advisory in accordance with its Merit Assessment Policy.
Other allowable additions and improvements
The below types of additions and improvements are also permitted on properties subject to Guideline 6:
Concrete inground swimming pools up to 12m long are permitted however no wet edge designs are permitted.
Exempt developments
In addition to the above, Subsidence Advisory has exempted some minor construction works from requiring approval under s22 of the Act.
For a full list of exempt developments, please refer to Subsidence Advisory’s Exempt Development list.
Proposed developments that do not comply with Guideline 6
Applications for proposed improvements that do not comply with the Guideline assigned to the property may be assessed under Subsidence Advisory’s Merit Assessment Policy.
Who can assess whether development complies with Guideline 6
Applications for proposed development that complies with this Guideline can be assessed by Subsidence Advisory, the relevant council or a registered certifier as defined in the Environmental Planning and Assessment Act 1979
Disclaimer
Please note that Subsidence Advisory’s Surface Development Guidelines are subject to change.