Retaining wall costs depend on wall length, height, material type, site access, and drainage requirements. As a guide, concrete sleeper retaining walls for a residential backyard typically range from $250 to $500 per linear metre for standard height walls, with taller walls or difficult access sites costing more. Timber sleeper walls are generally at the lower end of this range. Block walls vary by block type and finish. For clay-heavy sites in Riverstone and surrounds, additional drainage preparation is factored into the quote. Fayn Services provides free on-site quotes with itemised pricing — call 0406 982 199 to arrange a site assessment.

In NSW, retaining walls up to 600mm in height are generally exempt from council approval requirements as complying development under the NSW Exempt and Complying Development Codes SEPP. Walls over 600mm or those within certain setbacks from boundaries may require a development application or complying development certificate. Fayn Services assesses your site conditions and advises on approval requirements as part of the consultation process. We do not build retaining walls that require approval without ensuring the right process has been followed — both for your protection and ours.

Timber sleeper walls are generally the most affordable option and suit lower walls in residential gardens. They are susceptible to rotting over time, particularly in wet conditions, and have a lifespan of 10 to 20 years depending on the timber grade and drainage conditions. Concrete sleeper walls are more durable, maintenance-free, and available in a range of finishes including wood-grain textures. They suit higher walls and are the most popular choice in Western Sydney for residential applications. Block retaining walls — using natural stone, concrete blocks, or engineered block systems — are the most versatile aesthetically and can be engineered for significant height. Fayn Services discusses the pros and cons of each option relative to your site and budget during the consultation.

The primary cause of retaining wall failure is unmanaged hydraulic pressure — water building up in the soil behind the wall with nowhere to go. Fayn Services addresses this on every wall we build by installing drainage aggregate directly behind the wall, geotextile membrane to prevent soil migration into the drainage layer, and weep holes through the wall face at appropriate intervals to allow water to exit. On clay-heavy sites, which includes much of Riverstone and surrounding new estate areas, we assess the specific drainage conditions and may recommend additional measures such as agricultural drainage pipe connected to a controlled discharge point. This is a non-negotiable part of how we build — because a retaining wall without proper drainage is a retaining wall with an expiry date.