Due to the natural topography within Denham townsite, the use of retaining walls can be a necessity for building, to address moderate slopes or differences in levels on site.
Building large retaining walls on the boundaries of lots can cause negative visual impact on neighbours, and may not be the best design response to natural landform.
For residential development, most retaining walls require planning approval. Retaining walls are assessed in accordance with the Residential Design Codes.
If you require approval for retaining walls, you will need to lodge detailed plans to the Shire showing existing natural ground levels, proposed ground levels (excavation/fill) and retaining wall heights in Australian Height Datum (AHD). You may need to engage a licensed surveyor to provide the existing ground levels.
Engineering certification of the retaining walls may be required at planning application or building application stage.
If you propose any retaining walls on a vacant lot or as part of building site works, please liaise with the Shire's Consultant Planning Officer, Liz Bushby, at Gray & Lewis Landuse Planners (South Perth) by telephone from 8:00pm to 5:00pm Tuesday to Friday - (08) 9474 1722.